KR100707437B1 - Mobile communication system that compensates for delay of multipath received signal - Google Patents

Abstract

The present invention relates to a mobile communication system for compensating for a delay of a multi-path received signal in which delayed signals are sequentially applied to compensate for a delay of a signal, thereby suppressing interference caused by a delayed received signal. A delay compensator for receiving a signal input through the signal input unit and at least one delay compensating circuit connected in parallel to each other so that the signals received by the multipath are sequentially compensated by being applied to the respective delay compensating circuits. It can be configured to compensate for each delayed signal immediately in the order of application, it is possible to recover the signal much faster than the delay compensation circuit connected in series, if any one of the above compensation circuit Since only the circuit can be replaced separately, the operation is easy and multipath Since the interference caused by the signal can be greatly reduced, the performance degradation of the mobile communication terminal can be improved, thereby providing a good call service.

Multipath, delay compensation circuit, delay compensation table, compensation standard value, mobile communication terminal

Description

Mobile Communication System Recompensed for the time delay of Receive signal by Multi-Path}

1 is a configuration diagram schematically showing an interference signal suppression structure of a mobile communication system according to the prior art;

2 is a configuration diagram briefly showing a hand signal delay compensation structure of a mobile communication terminal according to the present invention;

3 is a diagram illustrating each received signal delayed by a multipath in a general mobile communication system.

4 is a block diagram showing details of a delay compensation structure of a mobile communication terminal according to the present invention;

5 is a detailed block diagram illustrating an internal configuration of a delay compensation unit of a mobile communication terminal according to the present invention.

<Explanation of symbols on main parts of the drawings>

10: signal input unit 20: signal output unit

50: delay compensator 51: profile detector

52: delay compensation circuit 53b: adder

54: delay compensation table

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile communication system that compensates for delays in multipath received signals. In particular, the present invention relates to a mobile communication system that compensates a delay of a signal by sequentially applying delayed signals. The present invention relates to a mobile communication system that compensates for a delay of a path reception signal.

In a wireless communication channel using a wireless communication network, signals transmitted from a mobile communication terminal or a base station are reflected by obstacles in the surrounding environment such as buildings, trees, mountains, cars, and others.

However, a specific mobile communication terminal or base station receiving a transmitted signal receives a plurality of signals in a damaged form instead of the original signal while passing through different multipaths by reflection in response to a single signal transmitted. The environment can be called a multipath propagation environment.

More specifically, the received signal corresponding to the transmission of the ideal signal on the mobile radio channel is a position dependent on the point of transmission of the signal due in part to the relative movement between the mobile communication terminal or base station and the environmental obstacle that transmitted the signal. , Depending on the attenuation and phase.

In addition, the fading phenomenon caused when the phase is shifted so that the phase interference occurs between the received signals received in the multi-path propagation environment, and the path loss due to the influence of air on the wireless communication signal May occur.

Therefore, in order to suppress the interference signal as described above, the mobile communication system according to the prior art is configured to connect a low noise amplifier to the receiving end of the signal.

1 is a configuration diagram schematically showing an interference signal suppression structure of a mobile communication system according to the prior art.

The conventional mobile communication system includes a signal input unit 1 through which a signal received through an antenna is input, a low noise amplifier (LNA) 3 for amplifying the input signals at a constant amplification factor, and a signal amplified from the low noise amplifier. It comprises a signal output unit 2 for outputting the.

The low noise amplifier 3 amplifies the received signal transmitted through the signal input unit 1 at a constant amplification factor in order to convert it into a baseband signal for reading, and transfers the amplified signal to the signal output unit 2. In this case, in order to suppress the noise signal applied with the received signal, it is amplified by a signal having a strength lower than that which should be amplified.

Therefore, the low noise amplifier 3 reduces the strength of the interference signal by simply suppressing the magnitude of the input signal, and thus the strength of the original transmitted signal received with the interference signal is also lowered. This will occur.

In addition, the interference signal suppression structure in the mobile communication system according to the prior art distinguishes the received signal from the signal received by the multipath and operates as the interference signal, and suppresses only the interference signal. As a result, the interference signal continuously affects the received signal.

On the other hand, in order to solve the above problem in another embodiment according to the prior art, a predetermined signal compensator is provided, it is configured to be output after compensating the delayed signal through the signal compensator.

However, in another embodiment described above, the respective compensation circuits constituting the signal compensator are connected to each other in series, so that in order to finally compensate the delay signals sequentially received from the outside, each signal compensator applied in series must pass. Therefore, there is a problem that a considerable time is delayed.

Particularly, when any one of the compensation circuits malfunctions, it is difficult to detect a malfunctioning compensation circuit, and even if detected, the entire signal compensator must be replaced in order to recover the error. This wasteful problem occurs.

The present invention has been made to solve the above-mentioned problems of the prior art, wherein at least one delay compensation circuit for compensating a delay signal is connected in parallel to each other, so that the delay signals received in turn are respectively connected to the delay compensation circuit. To provide a mobile communication system that compensates the delay of a multipath received signal that can be applied and simultaneously perform a compensation operation to compensate with the original received signal more faithfully and improve the processing speed of the compensation. There is this.

In the mobile communication system for compensating for the delay of the multipath received signal according to the present invention for solving the above problems, the signal input unit through which the signal received through the antenna is input, by the multipath in the signal input through the signal input unit Profile detection unit for detecting a plurality of delayed delay signal, the plurality of delay signals detected in parallel with each other are sequentially applied, and a plurality of compensation circuit for compensating the delay signal loss of the applied delay signal according to the stored compensation data A delay compensation circuit having a, a signal combiner for summing the signals compensated in the plurality of compensation circuits, and a signal output unit for transmitting the signal output from the signal combiner to the intermediate frequency RF filter side.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings. First, a mobile communication system according to the present invention is capable of voice and data communication via a code division multiple access (CDMA) system, a time division multiple access (TDMA) system, a frequency division multiple access (FDMA) communication system or a ground link between users. It can be applied to supporting mobile communication system.

In addition, a brief description of the receiving end of the mobile communication terminal that can be used in the mobile communication system according to the present invention.

The mobile communication terminal according to the present invention comprises an antenna for receiving a signal from a base station and a receiving end for converting the signal received from the antenna into a baseband signal to be transmitted to the control unit of the terminal, the receiving end is the antenna An RF filter converts the signal output from the intermediate frequency into an intermediate frequency, and an automatic gain controller for converting the intermediate frequency signal into a baseband signal.

FIG. 2 is a block diagram schematically illustrating a structure of receiving signal delay compensation of a mobile communication terminal according to the present invention. FIG. 3 is a diagram illustrating each received signal delayed by a multipath in a general mobile communication system.

The delay compensation structure of the mobile communication terminal according to the present invention is located between the antenna and the RF filter, the signal input unit 10 to receive the signal received through the antenna and the delay received through the signal input unit 10 And a delay compensator 50 to compensate the signal to approximate the original received signal.

The delay compensation structure is similarly restored to a signal originally intended to receive signals delayed / distorted by a multipath such as a person, a building, and other obstacles existing until a signal transmitted from a base station reaches a mobile communication terminal to be received. Compensate for each delay signal to be output.

That is, in general, when a signal transmitted from a base station is received by a mobile communication terminal, the signal actually received through the terminal antenna is refracted in addition to the main signal transmitted from the base station and immediately received by the terminal as shown in FIG. 3. Since the delay signals are sequentially received at predetermined time intervals while undergoing reflection or transmission, compensation for the lost signal or time delay in each delay signal can be restored to the original signal intended to be received from the base station. will be.

4 is a block diagram showing in detail the delay compensation structure of a mobile communication terminal according to the present invention.

Accordingly, the delay compensation structure of the mobile communication terminal according to the present invention includes the signal input unit 10 and the delay compensation unit 50 as described above, and the signal compensated by the delay compensation unit 50 is It is configured to include a signal output unit 20 to be delivered to the RF filter side.

The delay compensator 50 adds up at least one delay compensator 52 to which respective delay signals transmitted from the signal input unit 10 are applied, and a compensation signal output from each delay compensator 52. It is configured to include a signal combination unit 53 for calculating and transmitting to the signal output unit 20.

In addition, the delay compensation circuit 52 is configured to include a delay compensation table 54 stored in the compensation data is transmitted to each delay compensation circuit 52, so that each delay signal applied to each delay compensation circuit 52 is compensated, The apparatus may further include a profile detector 51 which determines a signal sequentially transmitted from the signal input unit 10 and transmits the signal to each delay compensation circuit 52.

The signal combiner 53 includes an adder 53b for adding the compensation signals for each unit transmitted from the delay compensation circuit 52 to the signal output unit 20, and adding the compensation signal to the signal output unit 20. The summation section 53b determines the main signal of the original signal directly transmitted from the base station among the plurality of signals transmitted from the circuit 52, and estimates the transmission intensity of the signal originally intended to be transmitted based on the determined intensity of the main signal. The apparatus may further include an intensity estimator 53a for determining whether the summed up signal is normally compensated.

The delay compensation table 54 stores data such as controlling the operation of the delay compensation circuit so as to be compensated to the maximum with respect to the delay signals sequentially applied to the respective delay compensation circuits 52. Since the value may vary depending on the compensation data, the compensation data corresponding to each compensation circuit is stored in sequence.

In particular, the delay compensation table 54 may be stored so that a compensation standard value for multiple reception channels in each region where a terminal of the mobile communication system is located corresponds to each compensation circuit 52.

Accordingly, the number of delay compensation circuits 52 may include the first to nth compensation circuits as the number of signal delay channels is set, and the effect of compensation on each channel according to various paths. It is implemented in a structure having a data of the average value for each value is maximized, can be compensated for each unit by the coefficients in the compensation circuit.

In addition, the compensation circuit 52 is connected to each other in parallel, so that when the delay signal detected from the profile detector 51 is applied according to each channel, the coefficient of the compensation circuit and the value of the delay compensation table 54 are set immediately. This compensates for the applied delay signal.

Looking at the operation of the present invention configured as described above are as follows.

The signal transmitted from the base station is received at predetermined time intervals through the multipath until reaching the mobile communication terminal to be received.

The received signal is transmitted to the profile detector 51 through the signal input unit 10, and based on the signal first received by the profile detector 51, a delay profile is generated by measuring time delays of subsequent received signals. The peak point of each detected signal is obtained using the generated delay profile.

At this time, the peak point of the signal detected by the profile detector 51 becomes the delay reception time. Therefore, when the peak points of the plurality of delay reception signals are detected at t1, t2, t3, and t4 in the order of time, each of the t2, t3, t4 is the delay time.

The received signal of each detected peak point is applied to the delay compensation circuit 52 connected in parallel for each channel, and the signal applied to the compensation circuit 52 is a standard compensation value transmitted from the delay compensation table 54. As a result, the delayed loss is restored and output.

On the other hand, the main signal of the original received signal, which is a reference for determining the delayed signal among the plurality of received signals, is applied to the strength estimating unit 53a, and transmitted from the base station through the applied main signal to be originally received by the terminal. Estimate

In addition, a plurality of compensation signals output from the delay compensation circuits 52 are transferred to the adder 53b, summed up entirely by the adder 53b, and transmitted to the signal output unit 20. By comparing the original signal strength estimated by the estimator 53a with the sum of the strengths of the summed signals, it is possible to determine whether the compensation is normally performed or to determine the recompensation operation of the signal.

As described above, the mobile communication system for compensating the delay of the multipath received signal according to the present invention has been described with reference to the illustrated drawings. However, the present invention is not limited by the embodiments and drawings disclosed herein, and a plurality of delay compensations are provided. The technical idea of the present invention to connect the circuits in parallel and to reconstruct the signal delayed by the multipath to the signal transmitted from the base station through a delay compensation table to compensate the signals applied to the compensation circuit, respectively, It can be easily applied by those skilled in the art within the scope of protection.

The mobile communication system for compensating for the delay of a multipath received signal according to the present invention configured as described above includes a delay compensation circuit and a delay compensation table connected in plural in parallel, and immediately compensates each delayed signal in the order of application. It is possible to recover the signal much faster than the delay compensation circuit connected in series, and if any one of the compensation circuits malfunctions, only the circuit can be replaced separately, so the operation is easy. .

In addition, since the interference caused by the multipath signal can be greatly reduced, the performance degradation of the mobile communication terminal can be improved, thereby providing a good call service.

Claims (6)

A signal input unit to receive a signal received through an antenna; A profile detector for detecting a plurality of delayed signals delayed by a multipath from a signal input through the signal input unit; A delay compensation circuit having a plurality of compensation circuits which are respectively connected in parallel with each other and are sequentially applied with the plurality of delay signals detected, and which compensates the delay signal loss of the applied delay signal according to the stored compensation data; A signal combiner configured to sum signals compensated in the plurality of compensation circuits; And And a signal output unit for transmitting the signal output from the signal combiner to an RF filter for converting the signal to an intermediate frequency. delete The method of claim 1, And the signal combiner comprises: an adder configured to sum the received signals compensated by the delay compensation circuits. The method of claim 3, wherein The signal combiner further includes: an intensity estimator for estimating whether the signals added by the adder are normally compensated by estimating the strength of the original received signal that should be received from the base station through the signals output from the respective compensation circuits; A mobile communication system for compensating for a delay of a multipath received signal, characterized in that. The method of claim 1, And a delay compensation table for storing compensation data used in the plurality of compensation circuits, respectively. The method of claim 5, The delay compensation table is a mobile communication system for compensating for the delay of the multi-path received signal, characterized in that the compensation standard value for each of the multiple reception channel in each region where the terminal can be located so as to correspond to each channel.

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