CN101217348B - Signal detection method, device and system - Google Patents

Abstract

Various embodiments of the present invention relate to a signal detection method, device and system, wherein the method includes: adding a preamble signal before sending an acknowledgment/negation signal, and then adding a post asynchronous signal; , the preamble signal and the postamble signal are matched, and the matching results are retransmitted and combined; the prefix signal of the currently received signal is detected to obtain the detection result of the prefix signal; at least according to the detection result of the prefix signal and the currently received signal The retransmission combining result judges the signal type of the currently received signal, and obtains the detection result of the currently received signal. The various embodiments of the present invention can solve the problems in the prior art such as increasing power and the impact of DTX being misjudged as a confirmation signal, so as to reduce the probability of misjudgment and the accuracy of detection.

Description

Signal detection method, device and system

technical field

The present invention relates to the field of communication technology, in particular to a signal detection method, device and system.

Background technique

High Speed Downlink Packet Access (HSDPA for short) is a downlink high-speed data solution for Wideband Code Division Multiple Access (WCDMA for short) system, and the maximum rate can reach more than 12M. The HSDPA system includes the use of short frames of 2 ms, the use of hybrid automatic retransmission request (Hybrid Automatic Retransmission Request, HARQ) and adaptive modulation and coding (Adaptive Modulation and Coding, referred to as AMC) and other link adaptive technologies at the physical layer, and the introduction of high-order modulation Improve spectrum utilization, and flexibly schedule among various user terminals (User Equipment, referred to as UE) through code division and time division, thereby effectively increasing the downlink data rate.

The HSDPA system includes a downlink high-speed shared control channel (Shared Control Channel for HS-DSCH, referred to as HS-SCCH), a high-speed physical downlink shared channel (High Speed Physical Downlink Shared Channel, referred to as HS-PDSCH) and an uplink high-speed dedicated physical control channel (Dedicated Physical Control Channel for HS-PDSCH, referred to as HS-DPCCH). The HS-SCCH channel carries downlink information, the HS-PDSCH channel carries downlink data, and the HS-DPCCH channel carries uplink feedback information.

In the prior art, the transmission of downlink control signaling and data is realized through the Node B (Node B). If the UE detects that a certain HS-SCCH that is being monitored carries the control information of the UE, then the UE indicates that the control information Then start to receive HS-PDSCH data. After decoding the HS-PDSCH data, the UE will send an acknowledgment signal "ACK" based on the Cyclic Redundancy Check (CRC) of the HSDPA Media Access Control (MAC-hs) Or deny the signal "NACK", and repeatedly send the acknowledge/deny signal in N consecutive uplink feedback HS-DPCCH subframes. Among them, "ACK" means that the data is received and decoded, and "NACK" means that the data is decoded incorrectly.

If the UE detects no control information on the HS-SCCH, neither "ACK" nor "NACK" is sent in the corresponding HS-DPCCH subframe. When there is no acknowledgment or acknowledgment signal transmission, the UE performs discontinuous transmission (DTX for short) in the uplink.

In the course of realizing the present invention, the inventor finds that there are at least the following problems in the prior art:

Uplink discontinuous transmission (DTX) information may be misjudged as an acknowledgment signal, and if the HS-SCCH data is decoded incorrectly, the data packet at the physical layer will be discarded, and it must go to the radio link control (RadioLink Control, RLC) layer For retransmission, if the Node B misjudges DTX as an acknowledgment signal "ACK", no data retransmission will be performed.

Contents of the invention

The technical problem to be solved by the embodiments of the present invention is to provide a signal detection method, device and system to reduce the probability of DTX being misjudged as "ACK" and improve the accuracy of signal detection.

In order to realize the embodiment of the present invention, the embodiment of the present invention provides a signal detection method, including:

Adding a preamble before sending one or more acknowledgment/negation signals, and adding a postamble after that;

Matching the current received signal with the acknowledgment signal, negative signal, preamble signal and postamble signal, and retransmitting and merging the matching results of the current receiving signal to obtain the matching retransmission and merging result of the current receiving signal;

Detecting the prefix signal of the currently received signal to obtain the detection result of the prefix signal;

The signal type of the current received signal is judged at least according to the detection result of the prefix signal and the matching retransmission combination result of the current received signal, and the detection result of the current received signal is obtained.

The embodiment of the present invention also provides a detection device comprising:

The matching module is used to match the current received signal with the preset confirmation signal, negative signal, preamble signal and postamble signal, and retransmit and combine the matching results of the current received signal to obtain the matching retransmission of the current received signal combined results;

The processing module is used to detect the prefix signal of the currently received signal, and obtain the detection result of the prefix signal; judge the signal type of the currently received signal at least according to the detection result of the prefix signal and the matching retransmission combination result of the current received signal, Obtain the detection result of the currently received signal.

The embodiment of the present invention also provides a signal detection system, including:

The user terminal is configured to add a preamble signal before sending one or more acknowledgment/denial signals after decoding the received downlink data, and then add a postamble signal;

Node B is used to match the currently received signal with the acknowledgment signal, negative signal, preamble signal, and postamble signal, and retransmit and combine the matching results of the currently received signal to obtain the matching retransmission and combination result of the currently received signal ; Detect the prefix signal of the current received signal to obtain the detection result of the prefix signal; at least judge the signal type of the currently received signal according to the detection result of the prefix signal and the matching retransmission combination result of the current received signal, and obtain the current received signal. Test results.

In the above technical solution, the preamble signal and the postamble signal are added, and the matching result of the currently received signal is combined with the detection result of the prefix signal to judge the current received signal as a whole, and the detection result of the prefix signal can filter out the currently received signal. The type of signal can improve the accuracy of signal detection, and under the same transmission power of ACK and NACK, it can effectively reduce the probability of DTX being misjudged as ACK.

The technical solutions of the embodiments of the present invention will be described in further detail below with reference to the drawings and embodiments.

Description of drawings

Fig. 1 is the flow chart of an example of the implementation of the signal detection method of the present invention;

Fig. 2 is the flow chart of Embodiment 2 of the signal detection method of the present invention;

Fig. 3 is the analytical schematic diagram of Fig. 2;

Fig. 4 is a schematic diagram of Embodiment 1 of the signal detection device of the present invention;

5 is a schematic diagram of Embodiment 2 of the signal detection device of the present invention;

6 is a schematic diagram of Embodiment 1 of the processing module in the signal detection device of the present invention;

7 is a schematic diagram of Embodiment 2 of the processing module in the signal detection device of the present invention;

Fig. 8 is a schematic diagram of Embodiment 3 of the signal detection device of the present invention;

9 is a schematic diagram of Embodiment 1 of the signal detection system of the present invention;

FIG. 10 is a schematic diagram of Embodiment 2 of the signal detection system of the present invention.

Detailed ways

In the present invention, if the number of retransmissions at the sending end (such as the user terminal) is 1, the user terminal adds the "Preamble" signal before sending the "ACK" or "NACK" signal, and adds the "Postamble" signal after the "ACK" or "NACK" signal. " signal, the signal sent is Preamble-ACK/NACK-Postamble in sequence; if the number of retransmissions is greater than 1, add the "Preamble" signal before sending the first "ACK" or "NACK" signal, and the last retransmission After the "ACK" or "NACK" signal, the "Postamble" signal is added. Assuming that the number of retransmissions is 2 and the ACK signal is sent, the Preamble-ACK-ACK-Postamble is sent in sequence. Adding a preamble signal (Preamble) and a postamble signal (Postamble) can reduce the transmission power of an acknowledgment signal (ACK) or a negative signal (NACK). After the sending end (such as the user terminal) sends the data stream, the corresponding receiving end can receive the signal, and detect the currently received signal to obtain the type of the currently received signal.

Referring to FIG. 1 , it is an analysis flowchart of Embodiment 1 of the signal detection method of the present invention. As shown in Figure 1, this embodiment first performs correlation matching 001 processing on the received data stream. Specifically, the current received signal can be compared with the four signals of "ACK", "NACK", "Preamble" and "Postamble". mode matching, since the number of possible retransmissions of the currently received signal is not 1, it is necessary to retransmit and combine the current signal matching result 004 to obtain the result of the matching retransmission and combination. When retransmission combination 004 is performed, prefix signal combination 002 and prefix signal detection 003 can be performed at the same time to obtain the detection result of the prefix signal. For details, please refer to the description of the prefix signal detection below. Finally, according to the prefix signal detection 003 obtained Perform signal detection 005 on the prefix signal detection result and the current signal matching retransmission combined result to obtain the current signal detection result, that is, the currently received signal is "ACK", "NACK", "Preamble", "Postamble" or "DTX ".

Detect the prefix signal of the currently received signal, and obtain the detection result of the prefix signal including:

1) When there is no detection result for the previous signal of the currently received signal, make a judgment: if the number of retransmissions is 1, take the signal of the previous ACK/NACK time slot as the prefix signal, and if the number of retransmissions is greater than 1, then use The combined signal of the first two ACK/NACK slots is used as the prefix signal;

2) If there is a detection result of the previous signal of the currently received signal, the detection result of the previous signal is directly taken as the detection result of the prefix signal.

HS-DPCCH carries uplink feedback signaling related to downlink HS-DSCH transmission. The signaling consists of acknowledgment (ACK) and channel quality indicator (CQI). Each subframe consists of 3 time slots. "ACK", "NACK" ", "Preamble", or "Postamble" is carried in the first time slot of the HS-DPCCH subframe, and CQI is carried in the second and third time slots. The above-mentioned embodiments of the present invention aim at the first time slot of each subframe One time slot (ACK/NACK time slot) is detected and judged, and other time slots (such as CQI time slots) other than the ACK/NACK time slot are not detected. The previous signal of the current received signal is also for ACK /NACK the signal for the slot.

In this embodiment, a preamble signal is added before sending an acknowledgment/negation signal, and a postamble signal is added thereafter, so that the transmission power of the acknowledgment signal ACK and the acknowledgment signal NACK can be reduced; and the detection results of the current received signal and the prefix signal are combined as Judging the current received signal as a whole, since the detection result of the prefix signal is added, the type of the current received signal can be filtered out. If the detection result of the prefix signal is a preamble signal, the currently received signal can only be ACK or NACK , further combined with the result of matching retransmission combination, the accuracy of signal detection can be improved, and under the same transmission power of ACK and NACK, the probability of DTX being misjudged as ACK can be effectively reduced.

Referring to FIG. 2 , it is a flow chart of Embodiment 2 of the signal detection method of the present invention. FIG. 3 is a schematic analysis diagram of FIG. 2 . As shown in Figure 2, this embodiment includes:

Step 0001: adding a preamble (Preamble) signal before sending one or more acknowledgment (ACK)/denial (NACK) signals, and then adding a postamble (Postamble) signal;

Step 0010: Preliminarily obtain the signal type of the current received signal according to the prior information of whether downlink data has been sent; the prior information can be obtained according to whether downlink data has been sent, for example, if Node B (Node B) was once in the nth HS - If the DSCH subframe has sent data uplink and downlink, the ACK/NACK signal fed back uplink on the nth subframe of the HS-DPCCH can be known and detected in advance;

Step 0002: Match the currently received signal with "ACK", "NACK", "Preamble" and "Postamble"; execute step 0003 and step 0004 at the same time;

Step 0003: Detect the prefix signal of the currently received signal, obtain the detection result of the prefix signal, and execute step 0005;

Step 0004: retransmit and combine the matching results of the current signal;

Step 0005: Judging the signal type of the current received signal according to the prior information, the detection result of the prefix signal and the retransmission combination result of the current received signal;

Step 0006: Obtain the detection result of the currently received signal.

This embodiment can be understood in conjunction with FIG. 3. The embodiment in FIG. 3 is similar to the embodiment in FIG. 1, but a priori information is also used. Since the receiving end receiving the user terminal data stream, such as the Node B, knows in advance whether There is data sent to the UE through the HS-DSCH, so this prior information can be used to filter out combinations of signals that are actually impossible, and further improve the accuracy of the receiving end (such as NodeB) in judging the received signal. As shown in Figure 3, the signal detection 051 in this embodiment analyzes and judges in combination with the prior information 010, the detection result of the prefix signal detection 004, and the result of the current signal retransmission and combination 003, and finally obtains the detection result of the current signal. This embodiment also adds prior information, thus further improving the accuracy of the detection result.

The embodiment of the present invention can also specifically combine the preset discontinuous transmission threshold value, that is, the DTX power threshold value, and compare the power of the current signal matching retransmission combination result with the preset DTX threshold value. threshold value, it is judged not to be DTX. Since the power of discontinuous transmission is relatively small and the transmission energy is low, if it exceeds this threshold, it is not discontinuous transmission, and the uplink must feedback "ACK", "NACK", "Preamble" or "Postamble" signals, Judgment can be made from these four types to filter out DTX. If it is lower than the preset threshold value, it can be preliminarily judged as a DTX signal; If the matching results of , "NACK", "Preamble" and "Postamble" are relatively low, it can also be preliminarily judged as DTX, but combined with the preset DTX threshold value, the detection result of the current signal will be more accurate.

When detecting the prefix signal, if it is detected that there is no previous signal detection result of the currently received signal, such as: the first signal sent by the user terminal, when the receiving end receives the signal, there is no previous signal for reference If the result of the detection is determined, the combined result of one or more acknowledgment/deny time slots before the current received signal can be detected, and the signal combined with the previous one or more acknowledgment/deny time slots can be used as the prefix signal; or the corresponding The signal type of the preamble signal and the preset discontinuous transmission threshold value are used to judge the combination result of the previous one or more acknowledgment/deny time slots to obtain the detection result of the preamble signal.

For the convenience of judgment, the following methods can be used when judging the type of the current received signal:

A combination list of the prefix signal and the corresponding current received signal is preset, and several signal types of the corresponding current received signal in the combination list are obtained according to the detection result of the prefix signal;

Judging whether the power of the matching retransmission combination result of the currently received signal is greater than the preset discontinuous transmission threshold value, if yes, it is preliminarily judged that the current received signal is not a discontinuous transmission signal; otherwise, it is initially judged that the current received signal is a discontinuous transmission signal;

The signal type of the corresponding current received signal preliminarily obtained according to the prior information, the corresponding signal types of the current received signal in the combination list, and the preliminary judgment result of the current received signal according to the preset intermittent transmission threshold value And judging the signal type of the current received signal based on the matching retransmission combining result of the currently received signal.

As shown in Table 1, to enumerate the prefix signal and the current possible signal combination list:

Table 1 Combination list of prefix signal and current signal

prefix signal possible types of the current signal number of combinations ACK/NACK ACK/NACK/PRE/POST 8 kinds PRE (Preamble) ACK/NACK 2 kinds DTX/POST (Postamble) PRE/DTX 4 types

It can be seen from Table 1 that there are 14 possible signal combinations. Therefore, when judging the current received signal, the prefix signal is obtained according to the prior information and the previous signal detection result, thereby reducing the number of types of the current signal, such as As shown in Table 1, the Preamble is abbreviated as PRE, and the Postamble is abbreviated as POST. If the prefix signal is detected as PRE, it can be seen from Table 1 that the current signal can only be ACK or NACK, and then combined with the matching and retransmission results of the current received signal , to determine the type of the current signal.

The above embodiments adopt the mode of adding pre- and post-asynchronous signals, and use 14 possible signal combinations to further improve the detection accuracy according to the preamble signal, DTX threshold value and/or prior information.

Referring to FIG. 4 , it is a schematic diagram of Embodiment 1 of the signal detection device of the present invention. As shown in Figure 4, this embodiment includes:

The matching module 01 is used to match the current received signal with the preset acknowledgment signal, negative signal, preamble signal and postamble signal, and retransmit and combine the matching results of the current received signal, so as to obtain the matching recombination of the current received signal Pass the merge result;

The processing module 02 is used to detect the prefix signal of the currently received signal to obtain the detection result of the prefix signal; judge the signal type of the currently received signal according to the detection result of the prefix signal and the matching retransmission combination result of the currently received signal.

The device in this embodiment combines the result of matching, retransmission and combination of the currently received signal with the detection result of the prefix signal to determine the type of the currently received data signal as a whole. The detection result of the prefix signal can filter out the type of the currently received signal, and further combined with the result of matching and retransmission combination, the correct signal type of the currently received signal can be obtained. This embodiment facilitates the detection of the signal type, further improving the accuracy of detection.

Referring to FIG. 5 , it is a schematic diagram of Embodiment 2 of the signal detection device of the present invention. This embodiment is similar to the embodiment in Figure 4, but may further include:

The a priori module 04 is connected to the processing module 02, and is used to initially obtain the corresponding currently received signal and/or the signal type of the prefix signal according to the a priori information of whether the downlink data has been sent; For example, if Node B (Node B) has sent data uplink and downlink in the nth HS-DSCH subframe, it can know and detect the ACK/ NACK signal;

It may also include: a threshold module 03, connected to the processing module 02, for storing a preset discontinuous transmission threshold;

In this embodiment, the processing module 02 includes:

The discrimination sub-module is used to judge the signal type of the current received signal according to the prior information, the preset intermittent transmission threshold value, the detection result of the prefix signal and the matching retransmission combination result of the currently received signal. For details, please refer to In the method embodiment, the related description of judging the type of the current signal according to the prior information, the threshold value, etc.

Referring to FIG. 6 , it is a schematic diagram of Embodiment 1 of the processing module in the signal detection device of the present invention. Processing modules in this embodiment include:

The prefix signal detection sub-module 0211 is configured to use the detection result of the previous received signal of the current received signal as the prefix signal of the current received signal, and use the detection result of the previous signal as the detection result of the prefix signal;

The combination list sub-module 0212 is used to store in advance a combination list including combinations of all prefix signals and corresponding current received signals;

The signal discrimination sub-module 0213 is connected with the prefix signal detection sub-module 0211 and the combination list sub-module 0212, and is used to obtain the signal type of the current received signal as a detection according to the matching retransmission combination result of the current received signal and the detection result of the prefix signal result.

Referring to FIG. 7 , it is a schematic diagram of Embodiment 2 of the processing module in the signal detection device of the present invention. The processing module of this embodiment includes:

The prefix signal detection sub-module 0221 is connected with the priori module, and is used to judge whether the previous signal of the current received signal has a detection result, if yes, the detection result of the previous signal of the current received signal is used as the detection result of the prefix signal; otherwise according to Several types of prefix signals corresponding to prior information are obtained, and according to the preset discontinuous transmission threshold value and the type of prefix signal corresponding to prior information, the previous one or more confirmation/denial signal time slots of the current received signal The merged result is judged to obtain the detection result of the prefix signal;

The combination list sub-module 0222 is connected to the prefix signal detection sub-module 0221, and is used to store a combination list including all combinations of the prefix signal and the corresponding current received signal, and obtain the number of corresponding current received signals in the combination list according to the detection result of the prefix signal. a signal type;

The judgment sub-module 0223 is connected with the prefix signal detection sub-module 0221 and the combination list sub-module 0222, and is used for judging whether the power of the current received signal is greater than the preset discontinuous transmission threshold value, and if so, preliminarily judges that the current received signal is not discontinuous Otherwise, it is preliminarily judged that the current received signal is an intermittent transmission signal; the signal type of the corresponding current received signal initially obtained according to the prior information, the corresponding signal types of the current received signal in the combination list, and the preset interrupt The continuous transmission threshold judges the signal type of the current received signal on the preliminary judgment result of the current received signal and the matching retransmission combination result of the current received signal, and obtains the signal type of the currently received signal as the detection result.

Referring to FIG. 8 , it is a schematic diagram of Embodiment 3 of the signal detection device of the present invention. The matching module of this embodiment includes:

Post synchronization (POST) mode sub-module 011, used for storing the mode information corresponding to the post synchronization signal, and matching the currently received signal with the stored post synchronization mode;

The preamble (PRE) mode sub-module 012 is used for storing the mode information corresponding to the preamble signal, and matching the currently received signal with the stored preamble mode;

Acknowledgment (ACK) mode sub-module 013, for storing the mode information corresponding to the acknowledgment signal, and matching the currently received signal with the stored acknowledgment mode;

Negative (NACK) mode sub-module 014, used for storing mode information corresponding to the negative signal, and matching the currently received signal with the stored negative mode;

The merge sub-module 015 is connected with the post-sync mode sub-module 012, the pre-sync mode sub-module 011, the confirm mode sub-module 013 and the deny mode sub-module 014, and is used for retransmitting and merging the matching results of each sub-module.

In this embodiment, the priori module 04 obtains the preamble signal and the possible mode (type) of the current received signal according to the priori information. Since DTX actually does not send data, it is noise at this time for the receiving end, so the DTX threshold module 03 The threshold value for discontinuous transmission can be preset according to the noise. As shown in Figure 8, all signals are input to the processing module 02, including the prefix signal obtained by the prior module 04 and the possible mode information of the current received signal, the DTX threshold value information of the threshold module 03, and the current signal of the matching module 01 Matching and retransmitting the combination result information, the processing module 02 judges the type of the current signal according to the above information. For details, refer to the relevant description of the processing module in FIG. 7 .

Referring to FIG. 9 , it is a schematic diagram of Embodiment 1 of the signal detection system of the present invention. This example includes:

The user terminal is configured to add a preamble signal before sending one or more acknowledgment/deny signals after decoding the received downlink data, and then add a postamble signal, and send an intermittent retransmission signal when no control information is detected;

Node B is used to match the currently received signal with the acknowledgment signal, negative signal, preamble signal, and postamble signal, and retransmit and combine the matching results of the currently received signal to obtain the matching retransmission and combination result of the currently received signal ; Detect the prefix signal of the current received signal to obtain the detection result of the prefix signal; at least judge the signal type of the currently received signal according to the detection result of the prefix signal and the matching retransmission combination result of the current received signal, and obtain the current received signal. Test results.

Node B is a functional entity that sends downlink data and control signaling, and may include general Node B functions, such as a downlink sending module for sending downlink data and control commands. In this embodiment, Node B not only includes general Node B functions , and also includes a functional module for detecting the uplink feedback signal to obtain the detection result of the current received signal. For the specific internal structure of the Node B, refer to the embodiments in FIG. 4, FIG. 5 and FIG.

Referring to FIG. 10 , it is a schematic diagram of Embodiment 2 of the signal detection system of the present invention. This embodiment further refines the node B, as shown in Figure 10, the node B in this embodiment includes:

The matching module 14 is used to match the current received signal with the preset confirmation signal, negative signal, preamble signal and postamble signal, and retransmit and combine the matching results;

A priori module 12, connected to the processing module 11, is used to initially obtain the signal type of the corresponding current received signal and/or prefix signal according to the prior information of whether the downlink data has been sent;

The threshold module 13 is connected with the processing module 11 and the user terminal 2, and is used to set the threshold value of the discontinuous transmission according to the DTX of the user terminal;

The processing module 11 is connected with the matching module 14, the threshold module 13 and the prior module 12, and is used to detect the prefix signal of the currently received signal to obtain the detection result of the prefix signal; according to the prior information, the detection result of the prefix signal, The discontinuous transmission threshold value and the matching and merging result of the current received signal judge the signal type of the currently received signal, and obtain the detection result of the currently received signal. The prefix signal can be the previous signal of the current received signal, or the previous or A signal in which multiple ACK/NAK signal slots are combined.

The present invention can have multiple specific implementations in different forms. Above, the technical solutions of the present invention are illustrated by taking Fig. 1-Fig. 10 as an example in conjunction with the accompanying drawings. In a specific process or embodiment structure, those skilled in the art should understand that the specific implementations provided above are just some examples of various preferred usages.

Those of ordinary skill in the art can understand that all or part of the steps for realizing the above-mentioned method embodiments can be completed by hardware related to program instructions, and the aforementioned program can be stored in a computer-readable storage medium. When the program is executed, the It includes the steps of the above method embodiments; and the aforementioned storage medium includes: ROM, RAM, magnetic disk or optical disk and other various media that can store program codes.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it can still be Modifications are made to the technical solutions described in the foregoing embodiments, or equivalent replacements are made to some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims (18)

1. A signal detection method, characterized in that, comprising: Adding a preamble before sending one or more acknowledgment/negation signals, and adding a postamble after that; Matching the current received signal with the acknowledgment signal, negative signal, preamble signal and postamble signal, and retransmitting and merging the matching results of the current receiving signal to obtain the matching retransmission and merging result of the current receiving signal; Detecting the prefix signal of the currently received signal to obtain the detection result of the prefix signal; The signal type of the current received signal is judged at least according to the detection result of the prefix signal and the matching retransmission combination result of the current received signal, and the detection result of the current received signal is obtained. 2. The signal detection method according to claim 1, wherein said judging the signal type of the current received signal at least according to the detection result of the prefix signal and the matching retransmission combination result of the current received signal comprises: The signal type of the currently received signal is judged according to the preset discontinuous transmission threshold value, the detection result of the prefix signal and the matching retransmission combination result of the currently received signal. 3. The signal detection method according to claim 2, wherein, before judging the signal type of the current received signal, it also includes: Preliminarily obtain the corresponding prefix signal and/or the signal type of the currently received signal according to the prior information of whether the downlink data has been sent; The judging the signal type of the current received signal at least according to the detection result of the prefix signal and the matching retransmission combination result of the current received signal specifically includes: The signal type of the current received signal is judged according to the prior information, the preset discontinuous transmission threshold, the detection result of the prefix signal and the matching retransmission combination result of the current received signal. 4. Any signal detection method according to claim 1-3, wherein the detection of the prefix signal of the currently received signal, and obtaining the detection result of the prefix signal specifically includes: When it is detected that the previous signal of the currently received signal has a detection result, the previous signal of the currently received signal is used as a prefix signal of the current received signal, and the detection result of the previous signal is used as the detection result of the prefix signal. 5. The arbitrary signal detection method according to claim 1-3, wherein said detecting the prefix signal of the currently received signal, and obtaining the detection result of the prefix signal include: When it is detected that there is no previous signal detection result of the currently received signal, it is judged whether the number of times of retransmission combining is 1, and if yes, the signal of the previous confirmation/denial signal time slot is taken as the prefix signal; otherwise, the first two confirmation/denial signals are The slot-combined signal serves as a prefix signal. 6. The signal detection method according to claim 5, wherein said detecting the prefix signal of the currently received signal and obtaining the detection result of the prefix signal further comprises: When it is detected that there is no previous signal detection result of the currently received signal, the type of the prefix signal corresponding to the prior information is obtained according to the prior information of whether the downlink data has been sent; According to the preset discontinuous transmission threshold value and the type of prefix signal corresponding to the prior information, the result of combining one or more previous acknowledgment/deny signal time slots of the current received signal is judged to obtain the detection result of the prefix signal. 7. The signal detection method according to claim 1, wherein said judging the signal type of the currently received signal, and obtaining the detection result of the currently received signal specifically comprises: A combination list of the prefix signal and the corresponding current received signal is preset, and several signal types of the corresponding current received signal in the combination list are obtained according to the detection result of the prefix signal; Judging the signal type of the currently received signal according to the matching retransmission combination result of the currently received signal and several signal types obtained in the combination list, and obtaining the signal type of the currently received signal as the detection result. 8. The signal detection method according to claim 3, wherein said judging the signal type of the currently received signal, and obtaining the detection result of the currently received signal specifically comprises: A combination list of the prefix signal and the corresponding current received signal is preset, and several signal types of the corresponding current received signal in the combination list are obtained according to the detection result of the prefix signal; Judging whether the power of the matching retransmission combination result of the currently received signal is greater than the preset discontinuous transmission threshold value, if yes, it is preliminarily judged that the current received signal is not a discontinuous transmission signal; otherwise, it is initially judged that the current received signal is a discontinuous transmission signal; The signal type of the corresponding current received signal preliminarily obtained according to the prior information, the corresponding signal types of the current received signal in the combination list, and the preliminary judgment result of the current received signal according to the preset intermittent transmission threshold value And the matching retransmission combining result of the currently received signal judges the signal type of the currently received signal, and obtains the signal type of the currently received signal as the detection result. 9. A signal detection device, characterized in that, comprising: The matching module is used to match the current received signal with the preset confirmation signal, negative signal, preamble signal and postamble signal, and retransmit and combine the matching results of the current received signal to obtain the matching retransmission of the current received signal combined results; The processing module is used to detect the prefix signal of the current received signal, and obtain the detection result of the prefix signal; judge the signal type of the current received signal at least according to the detection result of the prefix signal and the matching retransmission combination result of the current received signal, and obtain The detection result of the currently received signal. 10. signal detection device according to claim 9, is characterized in that, also comprises: The threshold module is used for storing a preset threshold value of discontinuous signal transmission. 11. signal detection device according to claim 10, is characterized in that, also comprises: A priori module, configured to preliminarily obtain the signal type of the corresponding current received signal and/or prefix signal according to the prior information of whether the downlink data has been sent; The processing modules include: The judging sub-module is used to judge the signal type of the currently received signal according to the prior information, the preset discontinuous transmission threshold, the detection result of the prefix signal and the matching retransmission combination result of the currently received signal. 12. The signal detection device according to claim 9, wherein the processing module comprises: The first prefix signal detection submodule is configured to use the detection result of the previous received signal of the current received signal as the prefix signal of the current received signal, and use the detection result of the previous signal as the detection result of the prefix signal; The first combination list submodule is used to store in advance a combination list including combinations of all prefix signals and corresponding current received signals; The first signal discrimination sub-module is configured to obtain the signal type of the current received signal as the detection result according to the matching retransmission combination result of the current received signal and the detection result of the prefix signal. 13. signal detection device according to claim 11, is characterized in that, described processing module also comprises: The second prefix signal detection sub-module is used to combine the results of the previous one or more confirmation/denial signal time slots of the current received signal according to the preset discontinuous transmission threshold value and the type of prefix signal corresponding to the prior information making a judgment to obtain a detection result of the prefix signal; The second combination list submodule is used to store a combination list including all combinations of the prefix signal and the corresponding current received signal, and obtain several signal types of the corresponding current received signal in the combination list according to the detection result of the prefix signal; The discrimination sub-module is used to judge whether the power of the current received signal is greater than the preset discontinuous transmission threshold value, if yes, it is preliminarily judged that the current received signal is not a discontinuous transmission signal; otherwise, it is preliminarily judged that the current received signal is a discontinuous transmission signal ; According to the signal type of the corresponding current received signal initially obtained according to the prior information, the corresponding signal types of the currently received signal in the combination list, the preliminary judgment result of the current received signal according to the preset intermittent transmission threshold, and The matching retransmission combination result of the currently received signal judges the signal type of the currently received signal, and obtains the signal type of the currently received signal as the detection result. 14. Any signal detection device according to claim 9-13, wherein the matching module comprises: A postamble pattern submodule, configured to store pattern information corresponding to the postamble signal, and match the currently received signal with the stored postamble pattern; The preamble mode submodule is used to store the mode information corresponding to the preamble signal, and match the currently received signal with the stored preamble mode; The confirmation mode sub-module is used for storing mode information corresponding to the confirmation signal, and matching the currently received signal with the stored confirmation mode; The negation mode submodule is used to store mode information corresponding to the negation signal, and match the currently received signal with the stored negation mode; The merging sub-module is used for retransmitting and merging the matching results of each sub-module. 15. A signal detection system, characterized in that, comprising: The user terminal is configured to add a preamble signal before decoding the received downlink data and sending one or more acknowledgment/denial signals, and then add a postamble signal; Node B is used to match the currently received signal with the acknowledgment signal, negative signal, preamble signal, and postamble signal, and retransmit and combine the matching results of the currently received signal to obtain the matching retransmission and combination result of the currently received signal ; Detect the prefix signal of the current received signal to obtain the detection result of the prefix signal; at least judge the signal type of the currently received signal according to the detection result of the prefix signal and the matching retransmission combination result of the current received signal, and obtain the current received signal. Test results. 16. The signal detection system according to claim 15, wherein the Node B comprises: The matching module is used to match the current received signal with the preset confirmation signal, negative signal, preamble signal and postamble signal, and retransmit and combine the matching results of the current received signal to obtain the matching retransmission of the current received signal combined results; The processing module is used to detect the prefix signal of the current received signal, and obtain the detection result of the prefix signal; judge the signal type of the current received signal at least according to the detection result of the prefix signal and the matching retransmission combination result of the current received signal, and obtain The detection result of the currently received signal. 17. The signal detection system according to claim 16, wherein the Node B further comprises: The threshold module is used for storing a preset threshold value of discontinuous signal transmission. 18. The signal detection system according to claim 17, wherein the Node B further comprises: A priori module, configured to preliminarily obtain the signal type of the corresponding current received signal and/or prefix signal according to the prior information of whether the downlink data has been sent; The processing modules include: The judging sub-module is used to judge the signal type of the currently received signal according to the prior information, the preset discontinuous transmission threshold, the detection result of the prefix signal and the matching retransmission combination result of the currently received signal.

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