CN106559172A - Encoded control method and device - Google Patents
Encoded control method and device Download PDFInfo
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- CN106559172A CN106559172A CN201510627517.8A CN201510627517A CN106559172A CN 106559172 A CN106559172 A CN 106559172A CN 201510627517 A CN201510627517 A CN 201510627517A CN 106559172 A CN106559172 A CN 106559172A
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- likelihood ratio
- soft bit
- demodulation
- mutual information
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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
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- 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
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- 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
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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
- H04L1/0045—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)
- Physics & Mathematics (AREA)
- Probability & Statistics with Applications (AREA)
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- Computer Networks & Wireless Communication (AREA)
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- Error Detection And Correction (AREA)
Abstract
Encoded control method and device, methods described include：Before solution rate-matched, obtain demodulation and obtain soft bit log-likelihood ratio information；Calculate the mutual information for demodulating and obtaining soft bit log-likelihood ratio information；When the mutual information that the demodulation obtains soft bit log-likelihood ratio information meets pre-conditioned, forbid carrying out decoded operation to the signal for receiving.Above-mentioned scheme, can save the decoding resource of communication system, improve communication system throughput.
Description
Technical field
The present invention relates to communication technical field, more particularly to a kind of encoded control method and device.
Background technology
Turbo codings are a kind of channel coding technologies of superior performance.Turbo decoders are by mutual iteration
Process exchanges external information to obtain the raising of performance between two component decoders, and iterations is higher,
Decoding performance is better, but while also brings along complexity raising, the longer shortcoming of time delay.For transmission speed
Rate requires higher communication system, and the time delay of reduction decoding and balance decoding delay and decoding performance are
Become the emphasis of research.
Communication system of the prior art, such as long evolving system (LTE), WCDMA
(WCDMA) system etc., carries out channel coding using Turbo code.It is excessively poor in received signal quality
In the case of, if still carrying out Turbo decodings, even if iterations is continuously increased cannot also decode correctly.
Some Turbo code decoding iteration method of shutting down are occurred in that in prior art, received signal is being translated
During code iteration, iteration can be stopped when meeting pre-conditioned, to reduce the number of times of iterative decoding,
The handling capacity of raising system.
But, these method majorities are to carry out arrest of judgement in advance in itself for decoder.In prior art
Communication system, no matter receive signal quality quality, can carry out decoded operation to received signal,
There is waste of resource.
The content of the invention
The technical problem that the embodiment of the present invention is solved is the decoding resource for saving communication system, improves communication system
System handling capacity.
To solve the above problems, a kind of encoded control method, methods described bag are embodiments provided
Include：
Before solution rate-matched, the information of the soft bit log-likelihood ratio that demodulation is obtained 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 pre-conditioned, it is right to forbid
The signal of reception carries out decoded operation.
Alternatively, it is described pre-conditioned for the mutual information of soft bit log-likelihood ratio that obtains of demodulating
Average is less than corresponding decision threshold.
Alternatively, the decision threshold be by inquire about the decision threshold and modulation system, code check it is right
Should be related to and obtain.
Alternatively, the mutual information for demodulating the soft bit log-likelihood ratio information for obtaining adopts following public affairs
Formula is calculated：
Wherein, MI_flp represents the soft bit pair that demodulation is obtained
The mutual information of number likelihood ratio, L represent the soft bit log-likelihood ratio that demodulation is obtained, and log is represented with 2 as bottom
Seek logarithm.
Alternatively, the average of the mutual information for demodulating the soft bit log-likelihood ratio information for obtaining is using such as
Under formula be calculated：
Wherein, MI_fxp represents the soft bit log-likelihood that demodulation is obtained
The average of the mutual information of ratio, N are the numbers of the soft bit log-likelihood ratio that the demodulation that statistics is obtained is obtained,
LUT|Li| represent the corresponding fixed point quantized value of mutual information of the i-th log-likelihood ratio information that demodulation is obtained.
The embodiment of the present invention additionally provides a kind of decoding control device, and described device includes：
Acquiring unit, was suitable to before solution rate-matched, obtained the soft ratio that the signal demodulation to receiving is obtained
The information of special log-likelihood ratio；
Computing unit, is suitable to calculate the mutual information of the soft bit log-likelihood ratio for demodulating and obtaining；
Judging unit, is suitable to judge whether the mutual information of the soft bit log-likelihood ratio for demodulating and obtaining is full
Foot is pre-conditioned；
Control unit, the mutual information for being suitable to the soft bit log-likelihood ratio information for demodulating and obtaining meet pre-
If during condition, forbidding carrying out decoded operation to the signal for receiving.
Alternatively, judging unit is suitable to the mutual information for judging the soft bit log-likelihood ratio for demodulating and obtaining
Average whether be less than corresponding decision threshold.
Alternatively, the decision threshold be by inquire about the decision threshold and modulation system, code check it is right
Should be related to and obtain.
Alternatively, the computing unit be suitable for use with formula below perform it is described calculate demodulation obtain it is soft
The operation of the mutual information of bit log-likelihood ratio：
Wherein, MI_flp represents the bit log that demodulation is obtained
The mutual information of likelihood ratio information, L represent the soft bit log-likelihood ratio that demodulation is obtained, and log is represented with 2
Logarithm is sought the bottom of for.
Alternatively, the computing unit be suitable for use with formula below perform it is described calculate demodulation obtain it is soft
The operation of the average of the mutual information of bit log-likelihood ratio information：
Wherein, MI_fxp represents the soft bit log-likelihood that demodulation is obtained
The average of the mutual information of ratio, N are the numbers of the soft bit log-likelihood ratio that the demodulation that statistics is obtained is obtained,
LUT|Li| represent i-th log-likelihood ratio L that demodulation is obtainediThe corresponding fixed point quantized value of mutual information.
Compared with prior art, technical scheme has the following advantages that：
Above-mentioned scheme, by calculating the mutual information outside Turbo decoders, that is, before solving rate-matched
The mutual information of soft bit log-likelihood ratio that demodulation is obtained, and it is determined that the soft bit logarithm that obtains of demodulation seemingly
When so the mutual information of ratio meets default condition, the second-rate of received signal is determined, now, prohibit
Only the signal to receiving enters row decoding, therefore, it can save decoding resource, and then can improve communication system
The handling capacity of system.
Description of the drawings
Fig. 1 is a kind of flow chart of the encoded control method in the embodiment of the present invention；
Fig. 2 is the flow chart of another kind of encoded control method in the embodiment of the present invention；
Fig. 3 is decision threshold and modulation system and the relation schematic diagram of code check in the embodiment of the present invention；
Fig. 4 is the structural representation of the decoding control device in the embodiment of the present invention.
Specific embodiment
To solve the above-mentioned problems in the prior art, the technical scheme that the embodiment of the present invention is adopted passes through
The mutual information outside Turbo decoders is calculated, that is, the soft bit logarithm for obtaining is demodulated before solving rate-matched
The mutual information of likelihood ratio, and it is determined that the mutual information for demodulating the soft bit log-likelihood ratio for obtaining meets default
Condition when, determine the second-rate of received signal, now forbid to receive signal enter row decoding,
Decoding resource can be saved, and then the handling capacity of communication system can be improved.
It is understandable to enable the above objects, features and advantages of the present invention to become apparent from, below in conjunction with the accompanying drawings
The specific embodiment of the present invention is described in detail.
The flow chart that Fig. 1 shows a kind of encoded control method in the embodiment of the present invention.As described in Figure 1
Encoded control method, can include：
Step S101：Before solution rate-matched, the soft bit log-likelihood ratio information that demodulation is obtained is obtained.
Step S102：Calculate the mutual information of the soft bit log-likelihood ratio for demodulating and obtaining.
Step S103：When the mutual information of the soft bit log-likelihood ratio for demodulating and obtaining meets pre-conditioned
When, forbid carrying out decoded operation to the signal for receiving.
The encoded control method in the embodiment of the present invention is further described in detail below in conjunction with Fig. 2.
The flow chart that Fig. 2 shows another kind of encoded control method in the embodiment of the present invention.Such as Fig. 2 institutes
The encoded control method stated, can include：
Step S201：Before solution rate-matched, the soft bit pair that the signal demodulation to receiving is obtained is obtained
The information of number likelihood ratio.
In being embodied as, before solution rate-matched, received signal is demodulated, and is obtained
The information of the soft bit log-likelihood ratio that demodulation is obtained.Wherein, demodulate the soft bit log-likelihood ratio for obtaining
Number for multiple.
Step S202：Calculate the mutual information of the soft bit log-likelihood ratio for demodulating and obtaining.
In being embodied as, the soft bit logarithm that the formula below calculating demodulation is obtained can be adopted seemingly
The mutual information of right ratio：
Wherein, MI_flp represents the mutual information of the soft bit log-likelihood ratio information that demodulation is obtained, and L is represented
The soft bit log-likelihood ratio that demodulation is obtained, log are represented with 2 the bottom of as and seek logarithm.
It is to be herein pointed out assuming that the number of the soft bit log-likelihood ratio that demodulation is obtained is N, N
Individual log-likelihood ratio is calculated using above-mentioned formula (1).
Meanwhile, by formula (1) it is recognised that demodulating the mutual information of the soft bit log-likelihood ratio for obtaining
For floating number.Therefore, for the convenience for implementing, the mutual information of each log-likelihood ratio can be entered
Row fixed point quantifies, and the average of the mutual information of corresponding N number of log-likelihood ratio information can adopt following public affairs
Formula is calculated：
Wherein, MI_fxp represents the average of the mutual information of the soft bit log-likelihood ratio that demodulation is obtained, and N is
The number of the soft bit log-likelihood ratio that the demodulation that statistics is obtained is obtained, LUT | Li| represent that demodulation is obtained the
I log-likelihood ratio LiMutual information fixed point quantized value.
It is to be herein pointed out being counted using formula (2) in the soft bit log-likelihood ratio obtained to demodulation
Calculation is when obtaining the average of mutual information absolute value, and the fixed point quantized value of the mutual information of each log-likelihood ratio can be with
Drawn by inquiring about the mapping table of the two.
For example, as a width of 6bit of fixed point quantization, demodulate the mutual information of the N number of log-likelihood ratio for obtaining
Fixed point quantized value can be drawn 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 |
As a width of 5bit of fixed point quantization, the mutual information of the N number of log-likelihood ratio information for obtaining is demodulated
Fixed point quantized value can be drawn by inquiry table 2：
Table 2
| |Li| | 0 | 1 | 2 | 3 | 4 | 5 | 6～15 |
| LUT|Li| | 0 | 2 | 7 | 11 | 13 | 14 | 15 |
It is to be herein pointed out specific fixed point quantifies the soft bit log-likelihood that bit wide is obtained by demodulation
Than determining.
Step S203：Judge to demodulate the mutual information of the soft bit log-likelihood ratio for obtaining whether less than corresponding
Decision threshold, when judged result is to be, can be with execution step S204, conversely, then can be with execution step
S205。
In being embodied as, the decision threshold can be by inquiring about decision threshold with modulation system and code
Corresponding relation between rate is obtained.Shown in Figure 3,301 corresponding modulation system of curve is to include
The quadrature amplitude modulation (16Quadrature Amplitude Modulation, 16QAM) of 16 kinds of symbols,
302 corresponding modulation system of curve is 64QAM, and 303 corresponding modulation system of curve is quadrature phase shift key
Control (Quadrature Phase Shift Keying, QPSK) modulation system.
Step S204：Forbid carrying out decoded operation to the signal for receiving.
In being embodied as, when it is determined that described demodulate the equal of the mutual information of soft bit log-likelihood ratio that obtains
When value is less than corresponding decision threshold, show the second-rate of received signal, now, even if to solution
Signal after rate-matched carries out decoded operation and also cannot correctly be decoded result, only can waste phase
The resource answered.At this point it is possible to forbid carrying out decoded operation to the signal after solution rate-matched, to save
Resource, improves the handling capacity of communication system.
Step S205：Row decoding is entered to the signal after solution rate-matched.
In being embodied as, when it is determined that the mutual information for demodulating the soft bit log-likelihood ratio information for obtaining
Average when being more than or equal to corresponding decision threshold, show that the signal quality for receiving is good, Ke Yiman
The requirement of sufficient correct decoding, can now continue to perform decoded operation to the signal after solution rate-matched.
Fig. 4 shows a kind of structural representation of the decoding control device in the embodiment of the present invention.Such as Fig. 4
Shown decoding control device 400, can include acquiring unit 401, computing unit 402, judging unit
403 and control unit 404, wherein：
Acquiring unit 401, was suitable to before solution rate-matched, and it is soft that acquisition is obtained to the signal demodulation for receiving
The information of bit log-likelihood ratio.
Computing unit 402, is suitable to calculate the mutual information of the soft bit log-likelihood ratio for demodulating and obtaining.
In being embodied as, the computing unit 402 is suitable for use with formula below and performs the calculating solution
The operation of the mutual information of the soft bit log-likelihood ratio that tune is obtained：
Wherein, MI_flp represents the soft bit logarithm that demodulation is obtained
The mutual information of likelihood ratio information, L represent that demodulation obtains soft bit log-likelihood ratio, and log is represented with 2 as bottom
Seek logarithm.
In being embodied as, the computing unit 402 is suitable for use with formula below and performs the calculating solution
The operation of the average of the mutual information of the soft bit log-likelihood ratio information that tune is obtained：
Wherein, MI_fxp represents the soft bit log-likelihood that demodulation is obtained
The average of the mutual information of ratio, N are the numbers of the soft bit log-likelihood ratio that the demodulation that statistics is obtained is obtained,
LUT|Li| represent i-th log-likelihood ratio L that demodulation is obtainediThe corresponding fixed point quantized value of mutual information.
Whether judging unit 403, be suitable to judge the mutual information of the soft bit log-likelihood ratio for demodulating and obtaining
Meet pre-conditioned.
In being embodied as, judging unit 403 is suitable to judge the soft bit log-likelihood for demodulating and obtaining
Whether the average of the mutual information of ratio is less than corresponding decision threshold.
In being embodied as, the decision threshold is by inquiring about the decision threshold and modulation system, code
The corresponding relation of rate is obtained.
Control unit 404, the mutual information for being suitable to the soft bit log-likelihood ratio information for demodulating and obtaining meet
When pre-conditioned, forbid carrying out decoded operation to the signal for receiving.
One of ordinary skill in the art will appreciate that all or part of step in the various methods of above-described embodiment
Suddenly can be by program to instruct the hardware of correlation to complete, the program can be stored in computer-readable
In storage medium, storage medium can include：ROM, RAM, disk or CD etc..
Above the method and system of the embodiment of the present invention are had been described in detail, the present invention is not limited to this.
Any those skilled in the art, without departing from the spirit and scope of the present invention, can make it is various change with
Change, therefore protection scope of the present invention should be defined by claim limited range.
Claims (10)
1. a kind of encoded control method, it is characterised in that include：
Before solution rate-matched, the information that the signal demodulation to receiving obtains soft bit log-likelihood ratio is obtained；
Calculate the mutual information for demodulating and obtaining soft bit log-likelihood ratio；
When the mutual information that the demodulation obtains soft bit log-likelihood ratio meets pre-conditioned, forbid to receiving
Signal carry out decoded operation.
2. encoded control method according to claim 1, it is characterised in that described pre-conditioned for described
Demodulation obtains the average of the mutual information of soft bit log-likelihood ratio and is less than corresponding decision threshold.
3. the encoded control method stated according to claim 2, it is characterised in that the decision threshold is by looking into
The corresponding relation that the decision threshold is ask with modulation system, code check is obtained.
4. the encoded control method according to Claims 2 or 3, it is characterised in that adopt formula below
Perform the operation for calculating and demodulating the mutual information for obtaining soft bit log-likelihood ratio：
Wherein, MI_flp represents that demodulation obtains soft bit logarithm
The mutual information of likelihood ratio information, L represent that log-likelihood ratio information L that demodulation is obtained represents that demodulation is obtained
Soft bit log-likelihood ratio information, log represents with 2 the bottom of as and seeks logarithm.
5. the encoded control method stated according to claim 4, it is characterised in that institute is performed using formula below
State the operation of the average for calculating the mutual information that demodulation obtains soft bit log-likelihood ratio：
Wherein, MI_fxp represents that demodulation obtains soft bit log-likelihood ratio
Mutual information average, N is the number that the demodulation that obtains of statistics obtains soft bit log-likelihood ratio,
LUT|Li| represent i-th log-likelihood ratio L that demodulation is obtainediThe corresponding fixed point quantized value of mutual information.
6. a kind of decoding control device, it is characterised in that include：
Acquiring unit, was suitable to before solution rate-matched, obtained the soft bit that the signal demodulation to receiving is obtained
Log-likelihood ratio information；
Computing unit, is suitable to calculate the mutual information of the soft bit log-likelihood ratio for demodulating and obtaining；
Judging unit, is suitable to judge whether the mutual information of the soft bit log-likelihood ratio for demodulating and obtaining meets
It is pre-conditioned；
Control unit, the mutual information for being suitable to the soft bit log-likelihood ratio for demodulating and obtaining meet pre-conditioned
When, forbid carrying out decoded operation to the signal for receiving.
7. decoding iteration control device according to claim 6, it is characterised in that judging unit is suitable to sentence
Whether the average of the disconnected mutual information for demodulating the soft bit log-likelihood ratio for obtaining is sentenced less than corresponding
Certainly thresholding.
8. decoding control device according to claim 7, it is characterised in that the decision threshold is to pass through
The corresponding relation that the decision threshold is inquired about with modulation system, code check is obtained.
9. the decoding control device according to claim 7 or 8, it is characterised in that the computing unit is fitted
In the mutual information that the soft bit log-likelihood ratio that the calculating demodulation is obtained is performed using formula below
Operation：
Wherein, MI_flp represents that demodulation obtains soft bit logarithm
The mutual information of likelihood ratio, L represent the soft bit log-likelihood ratio information that demodulation is obtained, and log is represented with 2
Logarithm is sought the bottom of for.
10. the decoding control device stated according to claim 9, it is characterised in that the computing unit is suitable for use with
Formula below performs the average of the mutual information for calculating the soft bit log-likelihood ratio that demodulation is obtained
Operation：
Wherein, MI_fxp represents the soft bit log-likelihood that demodulation is obtained
Than the average of the mutual information of information, N is the soft bit log-likelihood ratio that the demodulation that statistics is obtained is obtained
Number, LUT | Li| represent i-th log-likelihood ratio L that demodulation is obtainediThe corresponding fixed point amount of mutual information
Change value.
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| CN109150386A (en) * | 2017-06-28 | 2019-01-04 | 展讯通信（上海）有限公司 | User terminal, serving cell demodulation method and storage medium, electronic equipment |
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