CN106559172B - Encoded control method and device - Google Patents

Encoded control method and device Download PDF

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Publication number
CN106559172B
CN106559172B CN201510627517.8A CN201510627517A CN106559172B CN 106559172 B CN106559172 B CN 106559172B CN 201510627517 A CN201510627517 A CN 201510627517A CN 106559172 B CN106559172 B CN 106559172B
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likelihood ratio
soft bit
bit log
mutual information
obtains
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CN106559172A (en
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李俊强
仲崇祥
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Spreadtrum Communications Shanghai Co Ltd
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Spreadtrum Communications Shanghai Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056—Systems characterized by the type of code used
    • H04L1/0064—Concatenated codes
    • H04L1/0066—Parallel concatenated codes
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M13/00—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
    • H03M13/29—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes combining two or more codes or code structures, e.g. product codes, generalised product codes, concatenated codes, inner and outer codes
    • H03M13/2957—Turbo codes and decoding
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M13/00—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
    • H03M13/65—Purpose and implementation aspects
    • H03M13/6522—Intended application, e.g. transmission or communication standard
    • H03M13/6525—3GPP LTE including E-UTRA
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0045—Arrangements at the receiver end
    • H04L1/0047—Decoding adapted to other signal detection operation
    • H04L1/005—Iterative decoding, including iteration between signal detection and decoding operation

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Probability & Statistics with Applications (AREA)
  • Theoretical Computer Science (AREA)
  • Error Detection And Correction (AREA)

Abstract

Encoded control method and device, which comprises before solving rate-matched, obtain demodulation and obtain soft bit log-likelihood ratio information；It calculates the demodulation and obtains the mutual information of soft bit log-likelihood ratio information；When the mutual information that the demodulation obtains soft bit log-likelihood ratio information meets preset condition, forbid carrying out decoded operation to received signal.Above-mentioned scheme can save the decoding resource of communication system, improve communication system throughput.

Description

Encoded control method and device
Technical field
The present invention relates to fields of communication technology, more particularly to a kind of encoded control method and device.
Background technique
Turbo coding is a kind of channel coding technology of superior performance.Turbo decoder is by mutual iterative process two External information is exchanged between a component decoder to obtain the raising of performance, the number of iterations is higher, and decoding performance is better, but simultaneously Also bring along complexity raising, the longer disadvantage of time delay.The communication system higher for transmission rate request, reduces prolonging for decoding When and balance decoding delay and decoding performance have become the emphasis of research.
Communication system in the prior art, such as long evolving system (LTE), wideband code division multiple access (WCDMA) system, Channel coding is carried out using Turbo code.In the case where received signal quality is excessively poor, if still carrying out Turbo decoding, even if The number of iterations, which is continuously increased, can not also decode correctly.Occur some Turbo code decoding iteration method of shutting down in the prior art, During carrying out decoding iteration to received signal, iteration can be stopped when meeting preset condition, translated with reducing iteration Synchronous codes number improves the handling capacity of system.
But these method majorities are to carry out arrest of judgement in advance for decoder itself.Communication system in the prior art No matter system receives signal quality quality, can carry out decoded operation to received signal, there is asking for waste of resource Topic.
Summary of the invention
The technical issues of embodiment of the present invention solves is the decoding resource for saving communication system, improves communication system and handles up Amount.
To solve the above problems, the embodiment of the invention provides a kind of encoded control methods, which comprises
Before solving rate-matched, the information for the soft bit log-likelihood ratio that demodulation obtains is obtained；
Calculate the mutual information of the soft bit log-likelihood ratio for demodulating and obtaining；
When the mutual information of the soft bit log-likelihood ratio for demodulating and obtaining meets preset condition, forbid to received letter Number carry out decoded operation.
Optionally, the preset condition is that the mean value of the mutual information of the soft bit log-likelihood ratio for demodulating and obtaining is less than Corresponding decision threshold.
Optionally, the decision threshold is to be obtained by inquiring the corresponding relationship of the decision threshold and modulation system, code rate It arrives.
Optionally, the mutual information for demodulating obtained soft bit log-likelihood ratio information is calculated using following formula It arrives:
Wherein, MI_flp indicates the soft bit logarithm that demodulation obtains The mutual information of likelihood ratio, L indicate that the soft bit log-likelihood ratio that demodulation obtains, log indicate to seek logarithm the bottom of for 2.
Optionally, the mean value of the mutual information for demodulating obtained soft bit log-likelihood ratio information is using following formula It is calculated:
Wherein, MI_fxp indicates the soft bit log-likelihood ratio that demodulation obtains The mean value of mutual information, N are the numbers for the soft bit log-likelihood ratio that the obtained demodulation of statistics obtains, LUT | Li| expression demodulates The corresponding fixed point quantized value of the mutual information of i-th of the log-likelihood ratio information arrived.
The embodiment of the invention also provides a kind of decoding control device, described device includes:
Acquiring unit is suitable for before solve rate-matched, and the soft bit logarithm that acquisition demodulates received signal is seemingly The information of right ratio；
Computing unit, suitable for calculating the mutual information for demodulating obtained soft bit log-likelihood ratio；
Judging unit, suitable for judging whether the mutual information for demodulating obtained soft bit log-likelihood ratio meets default item Part；
Control unit meets preset condition suitable for the mutual information for demodulating obtained soft bit log-likelihood ratio information When, forbid carrying out decoded operation to received signal.
Optionally, judging unit is suitable for judging that the mean value of the mutual information of the soft bit log-likelihood ratio for demodulating and obtaining is It is no to be less than corresponding decision threshold.
Optionally, the decision threshold is to be obtained by inquiring the corresponding relationship of the decision threshold and modulation system, code rate It arrives.
Optionally, the computing unit is suitable for executing the soft bit logarithm for calculating demodulation and obtaining using following formula The operation of the mutual information of likelihood ratio:
Wherein, MI_flp indicates to demodulate obtained bit log seemingly So than the mutual information of information, L indicates that the soft bit log-likelihood ratio that demodulation obtains, log indicate to seek logarithm the bottom of for 2.
Optionally, the computing unit is suitable for executing the soft bit logarithm for calculating demodulation and obtaining using following formula The operation of the mean value of the mutual information of likelihood ratio information:
Wherein, MI_fxp indicates the soft bit log-likelihood ratio that demodulation obtains The mean value of mutual information, N are the numbers for the soft bit log-likelihood ratio that the obtained demodulation of statistics obtains, LUT | Li| expression demodulates I-th of the log-likelihood ratio L arrivediThe corresponding fixed point quantized value of mutual information.
Compared with prior art, technical solution of the present invention has the advantage that
Above-mentioned scheme, by calculating the mutual information outside Turbo decoder, i.e., demodulation obtains before solution rate-matched The mutual information of soft bit log-likelihood ratio, and determining that it is preset that the mutual information for demodulating obtained soft bit log-likelihood ratio meets When condition, the second-rate of received signal is determined, at this point, forbidding decoding received signal, therefore, can save Resource is decoded, and then the handling capacity of communication system can be improved.
Detailed description of the invention
Fig. 1 is the flow chart of one of embodiment of the present invention encoded control method；
Fig. 2 is the flow chart of another encoded control method in the embodiment of the present invention；
Fig. 3 is the relation schematic diagram of decision threshold and modulation system and code rate in the embodiment of the present invention；
Fig. 4 is the structural schematic diagram of the decoding control device in the embodiment of the present invention.
Specific embodiment
To solve the above-mentioned problems in the prior art, technical solution used in the embodiment of the present invention passes through calculating The mutual information that mutual information outside Turbo decoder, i.e. solution rate-matched demodulate obtained soft bit log-likelihood ratio before, and When determining that the mutual information for demodulating obtained soft bit log-likelihood ratio meets preset condition, the matter of received signal is determined It measures poor, forbids decoding received signal at this time, decoding resource can be saved, and then gulping down for communication system can be improved The amount of spitting.
To make the above purposes, features and advantages of the invention more obvious and understandable, with reference to the accompanying drawing to the present invention Specific embodiment be described in detail.
Fig. 1 shows the flow chart of one of embodiment of the present invention encoded control method.Encoded control as described in Figure 1 Method may include:
Step S101: before solving rate-matched, the soft bit log-likelihood ratio information that demodulation obtains is obtained.
Step S102: the mutual information of the soft bit log-likelihood ratio for demodulating and obtaining is calculated.
Step S103: when the mutual information of the soft bit log-likelihood ratio for demodulating and obtaining meets preset condition, forbid Decoded operation is carried out to received signal.
The encoded control method in the embodiment of the present invention is further described in detail below in conjunction with Fig. 2.
Fig. 2 shows the flow charts of another encoded control method in the embodiment of the present invention.Decoding control as described in Figure 2 Method processed may include:
Step S201: before solving rate-matched, the soft bit log-likelihood ratio demodulated to received signal is obtained Information.
In specific implementation, before solving rate-matched, received signal is demodulated, and obtains what demodulation obtained The information of soft bit log-likelihood ratio.Wherein, the number of the soft bit log-likelihood ratio demodulated is multiple.
Step S202: the mutual information of the soft bit log-likelihood ratio for demodulating and obtaining is calculated.
In specific implementation, the mutual of the soft bit log-likelihood ratio for demodulating and obtaining can be calculated using following formula Information:
Wherein, MI_flp indicates that the mutual information for the soft bit log-likelihood ratio information that demodulation obtains, L indicate what demodulation obtained Soft bit log-likelihood ratio, log indicate to seek logarithm the bottom of for 2.
It is to be herein pointed out assuming that the number for the soft bit log-likelihood ratio that demodulation obtains is N, N number of log-likelihood It is calculated than being all made of above-mentioned formula (1).
Meanwhile by formula (1) it is recognised that the mutual information for the soft bit log-likelihood ratio that demodulation obtains is floating number. Therefore, for the convenience of specific implementation, the mutual information of each log-likelihood ratio can be carried out to fixed point quantization, it is corresponding N number of right The mean value of the mutual information of number likelihood ratio information can be calculated using following formula:
Wherein, MI_fxp indicates that the mean value of the mutual information for the soft bit log-likelihood ratio that demodulation obtains, N statistics obtain The number of obtained soft bit log-likelihood ratio is demodulated, LUT | Li| indicate i-th of log-likelihood ratio L that demodulation obtainsiMutual trust The fixed point quantized value of breath.
It is to be herein pointed out being calculated mutually in the soft bit log-likelihood ratio obtained to demodulation using formula (2) When the mean value of information absolute value, the fixed point quantized value of the mutual information of each log-likelihood ratio can be closed by the corresponding of both inquiries It is that table obtains.
For example, when fixed point quantization bit wide is 6bit, the fixed point quantization of the mutual information of the N number of log-likelihood ratio demodulated Value can be obtained by inquiry table 1:
Table 1
|Li| 0 1 2 3 4 5 6 7~31
LUT|Li 0 5 15 22 27 29 30 31
When fixed point quantization bit wide is 5bit, the fixed point quantization of the mutual information of the N number of log-likelihood ratio information demodulated Value can be obtained by inquiry table 2:
Table 2
It is to be herein pointed out specific fixed point quantization bit wide is determined by the soft bit log-likelihood ratio demodulated.
Step S203: judge whether the mutual information for the soft bit log-likelihood ratio that demodulation obtains is less than corresponding decision gate Limit, when the judgment result is yes, can execute step S204, conversely, can then execute step S205.
In specific implementation, the decision threshold can be by between inquiry decision threshold and modulation system and code rate Corresponding relationship obtains.Shown in Figure 3, the corresponding modulation system of curve 301 is the quadrature amplitude modulation for including 16 kinds of symbols (16Quadrature Amplitude Modulation, 16QAM), the corresponding modulation system of curve 302 are 64QAM, curve 303 corresponding modulation systems are quadrature phase shift keying (Quadrature Phase Shift Keying, QPSK) modulation system.
Step S204: forbid carrying out decoded operation to received signal.
In specific implementation, when the mean value for determining the mutual information of soft bit log-likelihood ratio for demodulating and obtaining is less than pair When the decision threshold answered, show the second-rate of received signal, at this point, even if carrying out to the signal after solution rate-matched Decoded operation is also unable to get correctly decoding as a result, can only waste corresponding resource.At this point it is possible to forbid to solution rate-matched Signal later carries out decoded operation and improves the handling capacity of communication system to economize on resources.
Step S205: the signal after solution rate-matched is decoded.
In specific implementation, when the mean value for the mutual information for determining the soft bit log-likelihood ratio information for demodulating and obtaining is big When corresponding decision threshold, shows that received signal quality is good, can satisfy the requirement of correct decoding, at this time It can continue to execute decoded operation to the signal after solution rate-matched.
Fig. 4 shows the structural schematic diagram of one of embodiment of the present invention decoding control device.Decoding as shown in Figure 4 Control device 400 may include acquiring unit 401, computing unit 402, judging unit 403 and control unit 404, in which:
Acquiring unit 401 is suitable for before solving rate-matched, obtains the soft bit logarithm demodulated to received signal The information of likelihood ratio.
Computing unit 402, suitable for calculating the mutual information for demodulating obtained soft bit log-likelihood ratio.
In specific implementation, the computing unit 402 is suitable for executing what the calculating demodulation obtained using following formula The operation of the mutual information of soft bit log-likelihood ratio:
Wherein, MI_flp indicates the soft bit logarithm that demodulation obtains The mutual information of likelihood ratio information, L indicate that demodulation obtains soft bit log-likelihood ratio, and log indicates to seek logarithm the bottom of for 2.
In specific implementation, the computing unit 402 is suitable for executing what the calculating demodulation obtained using following formula The operation of the mean value of the mutual information of soft bit log-likelihood ratio information:
Wherein, MI_fxp indicates the soft bit log-likelihood ratio that demodulation obtains The mean value of mutual information, N are the numbers for the soft bit log-likelihood ratio that the obtained demodulation of statistics obtains, LUT | Li| expression demodulates I-th of the log-likelihood ratio L arrivediThe corresponding fixed point quantized value of mutual information.
Judging unit 403, suitable for judging it is pre- whether the mutual information for demodulating obtained soft bit log-likelihood ratio meets If condition.
In specific implementation, judging unit 403 is suitable for judging the mutual trust of the soft bit log-likelihood ratio for demodulating and obtaining Whether the mean value of breath is less than corresponding decision threshold.
In specific implementation, the decision threshold is by inquiring the corresponding of the decision threshold and modulation system, code rate Relationship obtains.
Control unit 404 meets default item suitable for the mutual information for demodulating obtained soft bit log-likelihood ratio information When part, forbid carrying out decoded operation to received signal.
Those of ordinary skill in the art will appreciate that all or part of the steps in the various methods of above-described embodiment is can It is completed with instructing relevant hardware by program, which can store in computer readable storage medium, and storage is situated between Matter may include: ROM, RAM, disk or CD etc..
The method and system of the embodiment of the present invention are had been described in detail above, the present invention is not limited thereto.Any Field technical staff can make various changes or modifications without departing from the spirit and scope of the present invention, therefore guarantor of the invention Shield range should be defined by the scope defined by the claims..

Claims (8)

1. a kind of encoded control method characterized by comprising
Before solving rate-matched, acquisition demodulates received signal to obtain the information of soft bit log-likelihood ratio；
It calculates the demodulation and obtains the mutual information of soft bit log-likelihood ratio；
When the mutual information that the demodulation obtains soft bit log-likelihood ratio meets preset condition, forbid carrying out received signal Decoded operation；Wherein, the preset condition be it is described demodulate obtain soft bit log-likelihood ratio mutual information mean value be less than pair The decision threshold answered.
2. encoded control method according to claim 1, which is characterized in that the decision threshold is by sentencing described in inquiry Certainly the corresponding relationship of thresholding and modulation system, code rate obtains.
3. encoded control method according to claim 1 or 2, which is characterized in that execute the meter using following formula Calculate the operation that demodulation obtains the mutual information of soft bit log-likelihood ratio:
Wherein, MI_flp indicates that demodulation obtains soft bit log-likelihood ratio The mutual information of information, L indicate the soft bit log-likelihood ratio information that demodulation obtains, and log indicates to seek logarithm the bottom of for 2.
4. encoded control method according to claim 3, which is characterized in that execute the calculating solution using following formula It adjusts and obtains the operation of the mean value of mutual information of soft bit log-likelihood ratio:
Wherein, MI_fxp indicates that demodulation obtains the mutual information of soft bit log-likelihood ratio Mean value, N is that the obtained demodulation of statistics obtains the number of soft bit log-likelihood ratio, LUT | Li| it indicates i-th that demodulation obtains Log-likelihood ratio LiThe corresponding fixed point quantized value of mutual information.
5. a kind of decoding control device characterized by comprising
Acquiring unit is suitable for before solving rate-matched, obtains the soft bit log-likelihood ratio demodulated to received signal Information；
Computing unit, suitable for calculating the mutual information for demodulating obtained soft bit log-likelihood ratio；
Judging unit, suitable for judging whether the mean value of the mutual information for demodulating obtained soft bit log-likelihood ratio is less than correspondence Decision threshold；
Control unit, suitable for it is described demodulate the obtained mutual information of soft bit log-likelihood ratio and meet preset condition when, forbid pair Received signal carries out decoded operation；Wherein, the preset condition is that the demodulation obtains the mutual trust of soft bit log-likelihood ratio The mean value of breath is less than corresponding decision threshold.
6. decoding control device according to claim 5, which is characterized in that the decision threshold is by sentencing described in inquiry Certainly the corresponding relationship of thresholding and modulation system, code rate obtains.
7. decoding control device according to claim 5 or 6, which is characterized in that the computing unit is suitable for using as follows Formula execute the operation for calculating the mutual information of soft bit log-likelihood ratio that demodulation obtains:
Wherein, MI_flp indicates that demodulation obtains soft bit log-likelihood ratio Mutual information, L indicates the obtained soft bit log-likelihood ratio information of demodulation, and log indicates to seek logarithm the bottom of for 2.
8. decoding control device according to claim 7, which is characterized in that the computing unit is suitable for using following public affairs Formula executes the operation of the mean value of the mutual information for calculating the soft bit log-likelihood ratio that demodulation obtains:
Wherein, MI_fxp indicates the soft bit log-likelihood ratio information that demodulation obtains The mean value of mutual information, N are the numbers for the soft bit log-likelihood ratio that the obtained demodulation of statistics obtains, LUT | Li| expression demodulates I-th of the log-likelihood ratio L arrivediThe corresponding fixed point quantized value of mutual information.
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