CN101600248B - TD-SCDMA communication system multiframe synchronization method and device - Google Patents
TD-SCDMA communication system multiframe synchronization method and device Download PDFInfo
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Abstract
This invention relates to the technical field of TD-SCDMA mobile communication and specifically provides a TD-SCDMA communication system multiframe synchronization method and a device. wherein, the methods specifically comprises the following steps: carrying out wireless channel equalization to a baseband signal according to a sub-frame synchronization point to obtain a soft bit information flow;carrying out channel decoding to the soft bit information flow to obtain a hard bit information flow; carrying out CRC check to the hard bit information flow, if checking results are all zero, multiframe synchronization signals are output, otherwise the multiframe synchronization signals are not output. The invention also provides a TD-SCDMA communication system multi-frame synchronization device, comprising a downlink frequency pilot code correlation module, a public time slot demodulation module, a channel decoding module and a CRC check module. The invention improves the anti-interference ability by channel decoding, and utilizes CRC check to exclude the false alarm probability of the multiframe synchronization, thus greatly enhancing the accuracy probability of the multiframe synchronization.
Description
Technical field
The present invention relates to TD-SCDMA mobile communication technology field, be specially a kind of TD-SCDMA communication system multiframe synchronization method and TD-SCDMA communication system multi-frame synchronizer.
Background technology
The TD-SCDMA standard is one of international standard of 3-G (Generation Three mobile communication system).In the TD-SCDMA communication system, the base station all adopts identical carrier frequency to send and receive with user terminal.For preventing the mutual interference of up-downgoing phase, user terminal must keep regularly synchronously with the base station end.In the down initial Cell searching, it is synchronous to carry out multi-frame, to parse cell broadcast information.
In the multi-frame synchronization scenario of prior art, user terminal all is to utilize the phase sequence of modulating on the descending pilot frequency time slot to judge.The length of phase sequence is 4, and that phase-detection just judges whether to finish multi-frame by the phase place of mating 4 descending pilot frequency time slots is synchronous.Because the length of phase sequence is shorter, so matching result opposing noise and interference capability a little less than, and phase-detection is subjected to the influence of channel distortions and noise jamming easily, thus at channel circumstance than under the condition of severe, existing multi-frame synchronization scenario error rate is higher.
Summary of the invention
The objective of the invention is to, propose a kind of new TD-SCDMA communication system multiframe synchronization method and device, improve resistivity, improve the synchronous correct probability of multi-frame channel distortions and noise jamming.
The TD-SCDMA communication system multiframe synchronization method that the present invention proposes comprises:
Step 1 according to sub-frame synchronization point, is carried out wireless channel equalization to baseband signal, obtains soft bit information flow; Described sub-frame synchronization point is the most powerful path position of downlink frequency pilot code;
Step 2 is carried out channel-decoding to described soft bit information flow, obtains hard bit information flow;
Step 3 is carried out the CRC check to described hard bit information flow, if assay all is zero, then exports multiframe alignment signal; Otherwise do not export multiframe alignment signal.
The TD-SCDMA communication system multi-frame synchronizer that the present invention proposes, except that comprising the downlink frequency pilot code correlation module that is used to obtain sub-frame synchronization point that has existed in the prior art, described sub-frame synchronization point is the most powerful path position of downlink frequency pilot code, also comprises:
Public time slot demodulation module is used to carry out wireless channel equalization and obtains soft bit information flow;
Channel decoding module is used to carry out channel-decoding and obtains hard bit information flow;
The CRC inspection module is used to carry out CRC check and output multiframe alignment signal;
Described downlink frequency pilot code correlation module carries out match search to baseband signal, obtains sub-frame synchronization point; Described public time slot demodulation module adopts public time slot demodulating algorithm that described baseband signal is carried out wireless channel equalization according to described sub-frame synchronization point, obtains soft bit information flow; Described channel decoding module is carried out channel-decoding to described soft bit information flow, obtains hard bit information flow; Described CRC inspection module carries out the CRC check to described hard bit information flow, if assay all is zero, then exports multiframe alignment signal; Otherwise do not export multiframe alignment signal.
The present invention can make multi-frame synchronously the resistivity of disturbing obviously be improved, and adopt the CRC check by soft bit information flow being carried out the process of channel-decoding, can get rid of multi-frame and miss alarm probability synchronously, reduces the synchronous error rate of multi-frame thereby reach.
Description of drawings
Fig. 1 is a TD-SCDMA subframe structure schematic diagram of the present invention;
Fig. 2 is a TD-SCDMA structure of time slot schematic diagram of the present invention;
Fig. 3 is a TD-SCDMA communication system multiframe synchronization method schematic flow sheet;
Fig. 4 is a TD-SCDMA communication system multi-frame synchronizer schematic diagram.
Embodiment
TD-SCDMA technology is called the Time Division-Synchronous Code Division Multiple Access technology, and in the multi-frame synchronization scenario of existing TD-SCDMA communication system, the phase sequence of modulating on the user terminal general using descending pilot frequency time slot is judged.But, cause existing multi-frame synchronization scenario error rate higher owing to reasons such as phase sequence are short.So the TD-SCDMA communication system is needed a kind of more reliable multiframe synchronization method badly.
TD-SCDMA subframe structure of the present invention comprises time slot 0～time slot 67 main time slots altogether as shown in Figure 1, also comprises 3 special time slots, and these 3 special time slots are respectively descending pilot frequency time slot, protection time slot and uplink pilot time slot at interval; The spreading rate M that the TD-SCDMA communication system is used
c=1.28 * 10
6Hz.Downlink frequency pilot code time slot bearing downlink pilot code is for user terminal improves the synchronizing sub-frame pilot tone.The effective length of downlink frequency pilot code is L
Dwpts=64.TD-SCDMA structure of time slot of the present invention as shown in Figure 2, comprise two data symbol fields and in lead sign indicating number, the data symbol length of field is L
Data=352.
The present invention program both had been applicable to a single aerial system, also was applicable to multiaerial system, and present embodiment only describes with a single aerial system.Whether suppose that herein wireless channel is the flat Rayleigh fading channel, use the flat Rayleigh fading channel to the not influence of invention scheme, only be to suppose for convenience and in the present embodiment.
The present invention proposes a kind of TD-SCDMA communication system multiframe synchronization method and TD-SCDMA communication system multi-frame synchronizer, be described with different embodiment respectively below.
Embodiment 1:
The TD-SCDMA communication system multiframe synchronization method that the present invention proposes, as shown in Figure 3, this method specifically may further comprise the steps:
Step 1 according to sub-frame synchronization point, adopts public time slot demodulating algorithm that baseband signal is carried out wireless channel equalization, obtains soft bit information flow.
The step that obtains sub-frame synchronization point belongs to prior art, simply is described below at this:
At first baseband signal is carried out match search, the process of match search is carried out according to following formula:
Wherein, the interval of k is 1≤k≤6400, C
Dwpts(k) downlink frequency pilot code correlation value of expression moment k position, r (k) expression is the baseband signal of k position constantly, S
Dwpts(i) numerical value of i chip of the local downlink frequency pilot code of expression.All downlink frequency pilot code correlation value that the result of match search is obtained compare then, that is:
In following formula, K
DwptsThe most powerful path position of expression downlink frequency pilot code is sub-frame synchronization point.
Adopt public time slot demodulating algorithm that baseband signal is carried out wireless channel equalization and have multiple implementation, the present invention had both put forward to use the so public time slot demodulating algorithm of multipath merge algorithm to carry out, and had like this and realized the advantage simple, that complexity is low; Simultaneously proposed the employing joint detection algorithm again and realized,, can resist multiple access and disturb better performances under the Complex Channel environment though use joint detection algorithm algorithm computation amount big.These two kinds of algorithms belong to the known decoding algorithm of industry.In the present embodiment, obtaining sub-frame synchronization point k
DwptsAfter, shift to an earlier date regular length according to the subframe structure of time slot, promptly can find time slot 0 data; Adopt the multipath merge algorithm to carry out wireless channel equalization then, obtain soft bit information flow.
Step 2 is carried out channel-decoding to soft bit information flow, obtains hard bit information flow.Soft bit information flow is carried out channel-decoding have multiple implementation, the present invention had both put forward to use the such channel-decoding algorithm of maximum likelihood decoding algorithm to carry out, and had the best advantage of performance like this, but complexity is also maximum; Simultaneously proposed employing Veterbi decoding algorithm again and carried out,, reduced complexity, realized simple though the relative maximum likelihood decoding algorithm of performance is relatively poor.Maximum likelihood decoding algorithm and Veterbi decoding algorithm all belong to the known decoding algorithm of industry.In the present embodiment, the code modulation mode of broadcast channel is fixed, and promptly adopts 1/3 convolution code and QPSK modulation, and weaving length is 20 milliseconds; According to aforementioned code modulation mode, adopt viterbi algorithm to carry out channel-decoding to soft bit information flow, obtain hard bit information flow.
Step 3 is carried out the CRC check to hard bit information flow, if assay all is zero, then exports multiframe alignment signal; Otherwise do not export multiframe alignment signal.The CRC check is to test according to predefined CRC generation method, and this method has been carried out standard in national sector standard.Standard can referring to: People's Republic of China's communication industry standard, YD/T 1371.3～2006, the requirement of 2G Hz TD-SCDMA digital mobile cellular telecommunication net Uu interface physical-layer techniques, third part: multiplexing and chnnel coding.If CRC checks successfully, promptly the result according to predefined CRC generation method check all is zero, then exports multiframe alignment signal; Otherwise unsuccessful for the CRC check, do not export multiframe alignment signal.
The TD-SCDMA communication system multiframe synchronization method that the present invention proposes, be by adopting public time slot demodulating algorithm that baseband signal is carried out wireless channel equalization, obtain soft bit information flow, and then it is carried out channel-decoding obtain hard bit information flow, at last hard bit information flow is carried out CRC check and detect, if testing result is zero output multiframe alignment signal entirely.This method realizes simple, has improved the resistivity to disturbing, and improves the synchronous correct probability of multi-frame.
Embodiment 2:
The invention allows for a kind of TD-SCDMA communication system multi-frame synchronizer, as shown in Figure 4, comprising: downlink frequency pilot code correlation module, public time slot demodulation module, channel decoding module and CRC inspection module.Wherein, the downlink frequency pilot code correlation module is to be used for baseband signal is carried out match search, obtains sub-frame synchronization point, and this module belongs to prior art.Other modules of device that the present invention proposes are as follows:
Public time slot demodulation module is to adopt public time slot demodulating algorithm to carry out wireless channel equalization to obtain soft bit information flow; Channel decoding module is used for that soft bit information flow is carried out channel-decoding and obtains hard bit information flow; And the CRC inspection module is used for hard bit information flow is carried out the CRC check and determined whether to export multiframe alignment signal by assay.
The same employing of the present embodiment subframe structure identical with Fig. 1, the downlink frequency pilot code effective length is L
Dwpts=64.
The downlink frequency pilot code correlation module carries out match search to baseband signal, obtains sub-frame synchronization point.Carrying out the process of match search carries out according to following formula:
Wherein, the interval of k is 1≤k≤6400, C
Dwpts(k) downlink frequency pilot code correlation value of expression moment k position, r (k) expression is the baseband signal of k position constantly, S
Dwpts(i) numerical value of i chip of the local downlink frequency pilot code of expression.The downlink frequency pilot code correlation module compares all downlink frequency pilot code correlation value of result's acquisition of match search then, that is:
In following formula, k
DwptsThe most powerful path position of expression downlink frequency pilot code is sub-frame synchronization point.
Public time slot demodulation module adopts public time slot demodulating algorithm that baseband signal is carried out wireless channel equalization according to sub-frame synchronization point, obtains soft bit information flow.There is multiple implementation owing to carry out the public time slot demodulation module of wireless channel equalization, the present invention proposes public time slot demodulation module that comprises employing multipath merge algorithm and the bulletin time slot demodulation module that adopts joint detection algorithm.These two kinds of algorithms belong to the industry known algorithm.Respectively have superiority, can select flexibly for the research staff.Present embodiment is the public time slot module that adopts the multipath merge algorithm, after obtaining sub-frame synchronization point, adopts the multipath merge algorithm to carry out wireless channel equalization, obtains soft bit information flow.
Channel decoding module is carried out channel-decoding to soft bit information flow, obtains hard bit information flow.Because there is multiple implementation in the channel decoding module of carrying out channel-decoding, the present invention proposes and comprise the channel decoding module that adopts maximum likelihood decoding algorithm and the channel decoding module of employing Veterbi decoding algorithm.Present embodiment is for adopting the channel decoding module of Veterbi decoding algorithm, and according to 1/3 convolution code and QPSK modulation, weaving length is 20 milliseconds a code modulation mode, and soft bit information flow is carried out channel-decoding, obtains hard bit information flow.
The CRC inspection module carries out the CRC check to hard bit information flow, if assay all is zero, then exports multiframe alignment signal; Otherwise do not export multiframe alignment signal.This step is carried out among process and the embodiment 1 identical to the description of step 4, no longer repeats at this.
Above-described embodiment of the present invention does not constitute the qualification to protection range of the present invention.Any modification of being done within the spirit and principles in the present invention, be equal to and replace and improvement etc., all should be included within the claim protection range of the present invention.
Claims (10)
1. a TD-SCDMA communication system multiframe synchronization method is characterized in that, comprising:
Step 1 according to sub-frame synchronization point, is carried out wireless channel equalization to baseband signal, obtains soft bit information flow, and described sub-frame synchronization point is the most powerful path position of downlink frequency pilot code;
Step 2 is carried out channel-decoding to described soft bit information flow, obtains hard bit information flow;
Step 3 is carried out the CRC check to described hard bit information flow, if assay all is zero, then exports multiframe alignment signal; Otherwise do not export multiframe alignment signal.
2. according to the described TD-SCDMA communication system multiframe synchronization method of claim 1, it is characterized in that the process of in the described step 1 described baseband signal being carried out wireless channel equalization specifically comprises: adopt the multipath merge algorithm that described baseband signal is carried out wireless channel equalization.
3. according to the described TD-SCDMA communication system multiframe synchronization method of claim 1, it is characterized in that the process of in the described step 1 described baseband signal being carried out wireless channel equalization specifically comprises: adopt joint detection algorithm that described baseband signal is carried out wireless channel equalization.
4. according to the described TD-SCDMA communication system multiframe synchronization method of claim 1, it is characterized in that the process of in the described step 2 described soft bit information flow being carried out channel-decoding specifically comprises: adopt maximum likelihood decoding algorithm that described soft bit information flow is carried out channel-decoding.
5. according to the described TD-SCDMA communication system multiframe synchronization method of claim 1, it is characterized in that the process of in the described step 2 described soft bit information flow being carried out channel-decoding specifically comprises: adopt the Veterbi decoding algorithm that described soft bit information flow is carried out channel-decoding.
6. a TD-SCDMA communication system multi-frame synchronizer comprises the downlink frequency pilot code correlation module that is used to obtain sub-frame synchronization point, and described sub-frame synchronization point is the most powerful path position of downlink frequency pilot code; It is characterized in that, also comprise:
Public time slot demodulation module is used to carry out wireless channel equalization and obtains soft bit information flow;
Channel decoding module is used to carry out channel-decoding and obtains hard bit information flow;
The CRC inspection module is used to carry out CRC check and output multiframe alignment signal;
Described downlink frequency pilot code correlation module carries out match search to baseband signal, obtains sub-frame synchronization point; Described public time slot demodulation module adopts public time slot demodulating algorithm that described baseband signal is carried out wireless channel equalization according to described sub-frame synchronization point, obtains soft bit information flow; Described channel decoding module is carried out channel-decoding to described soft bit information flow, obtains hard bit information flow; Described CRC inspection module carries out the CRC check to described hard bit information flow, if assay all is zero, then exports multiframe alignment signal; Otherwise do not export multiframe alignment signal.
7. according to the described TD-SCDMA communication system of claim 6 multi-frame synchronizer, it is characterized in that described public time slot demodulation module comprises the public time slot demodulation module that adopts the multipath merge algorithm.
8. according to the described TD-SCDMA communication system of claim 6 multi-frame synchronizer, it is characterized in that described public time slot demodulation module comprises the public time slot demodulation module that adopts joint detection algorithm.
9. according to the described TD-SCDMA communication system of claim 6 multi-frame synchronizer, it is characterized in that described channel decoding module comprises the channel decoding module that adopts maximum likelihood decoding algorithm.
10. according to the described TD-SCDMA communication system of claim 6 multi-frame synchronizer, it is characterized in that described channel decoding module comprises the channel decoding module that adopts the Veterbi decoding algorithm.
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| CN1595861A (en) * | 2003-09-11 | 2005-03-16 | 凯明信息科技股份有限公司 | A synchronization apparatus and method for CDMA mobile communication system |
| CN1885745A (en) * | 2006-07-11 | 2006-12-27 | 京信通信技术(广州)有限公司 | Synchronization realizing method under strong interference in mobile communication system |
| CN1925375A (en) * | 2006-09-15 | 2007-03-07 | 北京北方烽火科技有限公司 | Judging and position tagging method for descending synchronous code in TD-SCDMA system |
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| CN1595861A (en) * | 2003-09-11 | 2005-03-16 | 凯明信息科技股份有限公司 | A synchronization apparatus and method for CDMA mobile communication system |
| CN1885745A (en) * | 2006-07-11 | 2006-12-27 | 京信通信技术(广州)有限公司 | Synchronization realizing method under strong interference in mobile communication system |
| CN1925375A (en) * | 2006-09-15 | 2007-03-07 | 北京北方烽火科技有限公司 | Judging and position tagging method for descending synchronous code in TD-SCDMA system |
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