CN102045081B - Method for storing and optimizing sampling data of baseband receiving part in GSM (Global System for Mobile Communication) mobile communication terminal - Google Patents
Method for storing and optimizing sampling data of baseband receiving part in GSM (Global System for Mobile Communication) mobile communication terminal Download PDFInfo
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Abstract
The invention relates to a method for storing and optimizing sampling data of a baseband receiving part in a GSM (Global System for Mobile Communication) mobile communication terminal, comprising the following steps of: carrying out analog-digital conversion processing on a radio frequency demodulation data signal obtained by processing a radio frequency part; carrying out data sampling processing on the data signal obtained through the analog-digital conversion processing according to the function of the data signal; storing the sampling data obtained through the data sampling processing into a sampling data memory; and carrying out subsequent processing on the sampling data stored in the sampling data memory by the baseband receiving part according to the requirement of an upper control layer. By utilizing the method for storing and optimizing the sampling data of the baseband receiving part in the GSM mobile communication terminal, the utilization rate of the sampling data memory is enhanced, the requirement on hardware resources is reduced, the excessive loss of storage resources is avoided, and further the size of a chip RAM (Random Access Memory) is greatly decreased, the memory area is greatly reduced, the power consumption and the cost of the whole chip are lowered, meanwhile the working performance is stable and reliable, and the application range is wider.
Description
Technical field
The present invention relates to moving communicating field, particularly GSM mobile communication terminal data technical field of memory, specifically refers to the method for base band receiving unit sampled data storage optimization in a kind of GSM mobile communication terminal.
Background technology
GSM(Global System for Mobile communications, global system for mobile communications) be the most widely used digital mobile communication system in a kind of current whole world.
The terminal receiver hardware configuration of GSM mainly comprises two parts, is respectively radio frequency part and baseband portion.Wherein, described radio-frequency (RF) receiving circuit completes functions such as the reception of wireless signal and corresponding filtering, signal amplification, demodulation, baseband portion circuit comprises channel equalization, digital demodulation, channel decoding, encrypt/decrypt, and it also comprises the circuit such as speech/decoding, the fast adapter of code.The interface of radio frequency part and baseband portion adopts the digital sample data storage after A/D analog-to-digital conversion to realize.Analog signal sampling analog-to-digital conversion radio frequency partial solution being recalled becomes digital signal to carry out the respective handling of baseband portion.
In prior art, the transfer of data of GSM adopts time division multiple access (TDMA) mode, every carrier wave has 8 physical channels, basic Radio Resource is a time slot (time slot), length is 576.9us, modulation code speed is 270.833Kb/s(GX1), every slot time comprises 156.25bit, traditional sampled data storage mode is asked shown in Fig. 1, conventionally time synchronized and data demodulates are processed at same data segment, need to store two slot lengths four sampling rates (GX4) sampled data:
The memory space of 156.25 * 4 * 2=1250 word length (word).
Current wireless terminal chip is more and more higher for the requirement of area and power consumption, and memory occupies very large proportion in whole chip, owing to it not being optimized to processing in prior art, thereby chip area is larger, system power dissipation and cost are higher, and the competitiveness of product in market is on the low side.
Summary of the invention
The object of the invention is to have overcome above-mentioned shortcoming of the prior art, providing a kind of can be optimized processing, saving chip area, effectively reduce power consumption and cost, the raising competitiveness of product in market, stable and reliable working performance, the scope of application method of base band receiving unit sampled data storage optimization in GSM mobile communication terminal comparatively widely sampled data.
In order to realize above-mentioned object, in GSM mobile communication terminal of the present invention, the method for base band receiving unit sampled data storage optimization is as follows:
In this GSM mobile communication terminal, realize the method for base band receiving unit sampled data storage optimization, its main feature is that described method comprises the following steps:
(1) the radio demodulating data-signal that GSM mobile communication terminal obtains radio frequency section processes carries out analog-to-digital conversion process;
(2) described GSM mobile communication terminal carries out data sampling processing according to the function of data-signal to the data-signal obtaining after analog-to-digital conversion process;
(3) described GSM mobile communication terminal enters the sampled data storage obtaining after data sampling is processed in sampled data memory;
(4) described base band receiving unit carries out subsequent treatment according to upper strata key-course demand to the sampled data of storing in sampled data memory.
The GSM mobile communication terminal of realizing in this GSM mobile communication terminal in the method for base band receiving unit sampled data storage optimization carries out data sampling processing according to the function of data-signal to the data-signal obtaining after analog-to-digital conversion process, is specially:
Described GSM mobile communication terminal carries out the handover configurations of different pieces of information sample rate to the data-signal obtaining after analog-to-digital conversion process according to the difference in functionality of data-signal, and carry out data sampling processing according to current configured data sampling rate.
The GSM mobile communication terminal of realizing in this GSM mobile communication terminal in the method for base band receiving unit sampled data storage optimization carries out the handover configurations of different pieces of information sample rate and carries out data sampling processing according to current configured data sampling rate the data-signal obtaining after analog-to-digital conversion process according to the difference in functionality of data-signal, comprises the following steps:
(11) whether the described data-signal of system judgement is for search and the measurement of signal strength signal intensity, and if so, data sampling rate is set to single-time sampling rate, and carries out corresponding data sampling operation with single-time sampling rate;
(12) whether the described data-signal of system judgement belongs to frequency synchronization module, and if so, data sampling rate is set to single-time sampling rate, and with single-time sampling rate, carries out the data sampling operation of frequency synchronization module part;
(13) whether the described data-signal of system judgement belongs to time synchronized module, and if so, data sampling rate is set to four sampling rates, and with four sampling rates, carries out the data sampling operation of time synchronized module section;
(14) whether the described data-signal of system judgement belongs to the burst of channel demodulation deinterleaving decoder module, and if so, data sampling rate is set to single-time sampling rate, and carries out corresponding data sampling operation with single-time sampling rate.
In this GSM mobile communication terminal, realize and with four sampling rates, carry out the data sampling operation of time synchronized module section in the method for base band receiving unit sampled data storage optimization, be specially:
With four sampling rates, the training sequence of synchronizing channel is carried out to data sampling scanning, and obtain corresponding sampled data.
The maximum length that realizes the training sequence of the synchronizing channel in the method for base band receiving unit sampled data storage optimization in this GSM mobile communication terminal is 64 word lengths.
The burst of realizing in this GSM mobile communication terminal in the method for base band receiving unit sampled data storage optimization comprises frequency error correction pulse, Synchronization Burst and normal burst pulse.
Adopted the method for base band receiving unit sampled data storage optimization in the GSM mobile communication terminal of this invention, owing to wherein according to systemic-function, the demand of sampled data being carried out the switching of four sampling rates and single-time sampling rate, multiplexing 156.25 * 2 of timesharing approximates the memory space of 313word, improved can sampled data memory utilance, reduced hardware resource requirements, because the maximum length demand of sampled data memory is 2 time slots, adopt the sampled data of GX1 can meet system requirements, and the maximum length of GX4 sampled data demand is (64/156.25) time slot, comprehensively both have determined sampled data memory span demand, avoided conventional being in harmonious proportion separating synchronously to process the RAM loss that needed 2 burst adopt GX4 data to cause simultaneously, thereby greatly reduced the size of chip RAM, greatly saved memory area, reduce power consumption and the cost of whole chip, while stable and reliable working performance, the scope of application is comparatively extensive.
Accompanying drawing explanation
Fig. 1 is the operation principle schematic diagram of GSM mobile communication terminal access sampled data memory of the prior art.
Fig. 2 is the whole principle schematic of the method for base band receiving unit sampled data storage optimization in GSM mobile communication terminal of the present invention.
Fig. 3 is the principle schematic of the GSM terminal access physical layer data processing in the method for base band receiving unit sampled data storage optimization in GSM mobile communication terminal of the present invention.
Embodiment
In order more clearly to understand technology contents of the present invention, especially exemplified by following examples, describe in detail.
Refer to shown in Fig. 2 and Fig. 3, in this GSM mobile communication terminal, realize the method for base band receiving unit sampled data storage optimization, comprising following steps:
(1) the radio demodulating data-signal that GSM mobile communication terminal obtains radio frequency section processes carries out analog-to-digital conversion process;
(2) described GSM mobile communication terminal carries out data sampling processing according to the function of data-signal to the data-signal obtaining after analog-to-digital conversion process, is specially:
Described GSM mobile communication terminal carries out the handover configurations of different pieces of information sample rate to the data-signal obtaining after analog-to-digital conversion process according to the difference in functionality of data-signal, and carry out data sampling processing according to current configured data sampling rate, comprising following steps:
(a) whether the described data-signal of system judgement is for search and the measurement of signal strength signal intensity, and if so, data sampling rate is set to single-time sampling rate, and carries out corresponding data sampling operation with single-time sampling rate;
(b) whether the described data-signal of system judgement belongs to frequency synchronization module, and if so, data sampling rate is set to single-time sampling rate, and with single-time sampling rate, carries out the data sampling operation of frequency synchronization module part;
(c) whether the described data-signal of system judgement belongs to time synchronized module, and if so, data sampling rate is set to four sampling rates, and with four sampling rates, carries out the data sampling operation of time synchronized module section, is specially:
With four sampling rates, the training sequence of synchronizing channel is carried out to data sampling scanning, and obtain corresponding sampled data; The maximum length of the training sequence of this synchronizing channel is 64 word lengths;
(d) whether the described data-signal of system judgement belongs to the burst of channel demodulation deinterleaving decoder module, and if so, data sampling rate is set to single-time sampling rate, and carries out corresponding data sampling operation with single-time sampling rate; Described burst comprises frequency error correction pulse, Synchronization Burst and normal burst pulse;
(3) described GSM mobile communication terminal enters the sampled data storage obtaining after data sampling is processed in sampled data memory;
(4) described base band receiving unit carries out subsequent treatment according to upper strata key-course demand to the sampled data of storing in sampled data memory.
In the middle of reality is used, refer to shown in Fig. 2, the present invention has broken the mentality of designing of traditional sampled data storage, and according to systemic-function, the demand of sampled data is carried out the switching of four sampling rates and single-time sampling rate, multiplexing 156.25 * 2 of timesharing approximates the memory space of 313word, greatly save memory area, reduced power consumption and the cost of whole chip.
Concrete realization approach is as follows:
(1) for time synchronized demand, for needing training sequence (training squence) part of scanning (scan) to adopt four sampling rate (GX4) input sampling data memories, the training sequence length of the longest synchronizing channel (SCH) is 64, and the memory space taking is 64 * 4=256word;
(2) for separating the Frequency Synchronization demand that is in harmonious proportion, adopt single-time sampling rate (GX1) input sampling data memory, concrete initial GX4 point determined by synchronous scanning, and storage requirement is the GX1 data of 2 time slots, i.e. 156.25 * 2 memory spaces that approximate 313word.
For GSM mobile communication terminal, the brief data flow process of physical layer data access part refers to shown in Fig. 3.Wherein radio frequency (RF) demodulating data is after ADC analog-to-digital conversion, sampled data is carried out depositing sampled data memory in after necessary data processing, finally by base-band digital processing section according to upper strata key-course demand measure, Frequency Synchronization, time synchronized, channel demodulation and decoding.According to each module of base-band digital processing section, the demand of sampled data is analyzed below, and illustrated technical scheme of the present invention.
(1) search of signal strength signal intensity and measurement, be that each frequency is carried out to signal energy computation, this part need to interval in certain hour section carry out respectively the calculating of sampled data, finally get average and report, single-time sampling rate can satisfy the demands.
(2) frequency synchronization module is according to frequency error-correcting channel (FCCH, by frequency error correction pulse, formed) characteristic, obtain the frequency departure of mobile terminal (MS) and base station (BS), carry out corresponding synchronous correction, obtain rough channel initial time simultaneously, to synchronizing channel, provide reference.This part adopts the sampled data of single-time sampling rate to satisfy the demands, and obtains frequency departure up to standard and time estimation information.
(3) starting stage that time synchronized module is selected in community can be scanned the training sequence of synchronizing channel (SCH) according to the rough time estimation information obtaining of frequency synchronization module, obtain optimum synchronizing channel initial time, idle and working stage can according to time interocclusal record estimate the initial time of synchronizing channel, the training sequence that carries out synchronizing channel (SCH) scans, and obtains optimum synchronizing channel initial time.In this part, need to be optimized to the precise time point of GX4, therefore adopt four sampling rates that the sampled data of the training sequence of synchronizing channel (SCH) is scanned to acquisition.
(4) physical content of logic channel on time slot is burst (BURST), terminal access part comprise frequency error correction pulse (FB), Synchronization Burst (SB) and normal burst pulse (NB).Channel demodulation deinterleaving decoder module is demodulation, deinterleaving, the decoding of carrying out the logic channel that is comprised of SB and NB on the basis of the precise time information that obtains in time synchronized module.This part adopts single-time sampling rate to meet the demands, and obtains correct transmission data.
By above-mentioned analysis, determine the switching controls of single-time sampling rate and four sampling rates, and determine that in conjunction with the thinking of content part of the present invention the capacity of sampled data memory is the sampled data space of two slot length single-time sampling rates, the redundancy of maximized reduction data storage, improve its utilance, reduce hardware cost and power consumption.
Adopted the method for base band receiving unit sampled data storage optimization in above-mentioned GSM mobile communication terminal, owing to wherein according to systemic-function, the demand of sampled data being carried out the switching of four sampling rates and single-time sampling rate, multiplexing 156.25 * 2 of timesharing approximates the memory space of 313word, improved can sampled data memory utilance, reduced hardware resource requirements, because the maximum length demand of sampled data memory is 2 time slots, adopt the sampled data of GX1 can meet system requirements, and the maximum length of GX4 sampled data demand is (64/156.25) time slot, comprehensively both have determined sampled data memory span demand, avoided conventional being in harmonious proportion separating synchronously to process the RAM loss that needed 2 burst adopt GX4 data to cause simultaneously, thereby greatly reduced the size of chip RAM, greatly saved memory area, reduce power consumption and the cost of whole chip, while stable and reliable working performance, the scope of application is comparatively extensive.
In this specification, the present invention is described with reference to its specific embodiment.But, still can make various modifications and conversion obviously and not deviate from the spirit and scope of the present invention.Therefore, specification and accompanying drawing are regarded in an illustrative, rather than a restrictive.
Claims (5)
1. in GSM mobile communication terminal, realize a method for base band receiving unit sampled data storage optimization, it is characterized in that, described method comprises the following steps:
(1) the radio demodulating data-signal that GSM mobile communication terminal obtains radio frequency section processes carries out analog-to-digital conversion process;
(2) described GSM mobile communication terminal carries out data sampling processing according to the function of data-signal to the data-signal obtaining after analog-to-digital conversion process;
Described GSM mobile communication terminal carries out data sampling processing according to the function of data-signal to the data-signal obtaining after analog-to-digital conversion process, is specially:
Described GSM mobile communication terminal carries out the handover configurations of different pieces of information sample rate to the data-signal obtaining after analog-to-digital conversion process according to the difference in functionality of data-signal, and carry out data sampling processing according to current configured data sampling rate;
(3) described GSM mobile communication terminal enters the sampled data storage obtaining after data sampling is processed in sampled data memory;
(4) described base band receiving unit carries out subsequent treatment according to upper strata key-course demand to the sampled data of storing in sampled data memory.
2. in GSM mobile communication terminal according to claim 1, realize the method for base band receiving unit sampled data storage optimization, it is characterized in that, described GSM mobile communication terminal carries out the handover configurations of different pieces of information sample rate and carries out data sampling processing according to current configured data sampling rate the data-signal obtaining after analog-to-digital conversion process according to the difference in functionality of data-signal, comprises the following steps:
(11) whether the described data-signal of system judgement is for search and the measurement of signal strength signal intensity, and if so, data sampling rate is set to single-time sampling rate, and carries out corresponding data sampling operation with single-time sampling rate;
(12) whether the described data-signal of system judgement belongs to frequency synchronization module, and if so, data sampling rate is set to single-time sampling rate, and with single-time sampling rate, carries out the data sampling operation of frequency synchronization module part;
(13) whether the described data-signal of system judgement belongs to time synchronized module, and if so, data sampling rate is set to four sampling rates, and with four sampling rates, carries out the data sampling operation of time synchronized module section;
(14) whether the described data-signal of system judgement belongs to the burst of channel demodulation deinterleaving decoder module, and if so, data sampling rate is set to single-time sampling rate, and carries out corresponding data sampling operation with single-time sampling rate.
3. in GSM mobile communication terminal according to claim 2, realize the method for base band receiving unit sampled data storage optimization, it is characterized in that, described carries out the data sampling operation of time synchronized module section with four sampling rates, is specially:
With four sampling rates, the training sequence of synchronizing channel is carried out to data sampling scanning, and obtain corresponding sampled data.
4. in GSM mobile communication terminal according to claim 3, realize the method for base band receiving unit sampled data storage optimization, it is characterized in that, the maximum length of the training sequence of described synchronizing channel is 64 word lengths.
5. in GSM mobile communication terminal according to claim 2, realize the method for base band receiving unit sampled data storage optimization, it is characterized in that, described burst comprises frequency error correction pulse, Synchronization Burst and normal burst pulse.
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