CN106533454B - Turbo code decoding iteration control method and device - Google Patents
Turbo code decoding iteration control method and device Download PDFInfo
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Abstract
Turbo code decoding iteration control method and device, which comprises in previous iterative decoding process, when the component decoder of Turbo decoder, which executes corresponding operation, to be finished, obtain the external information of the component decoder output；Calculate the mutual information of the external information of the component decoder output；When determining that the mutual information of external information of the component decoder output meets preset condition, stops decoding and export decoding result.Above-mentioned scheme can simplify the process of Turbo code decoding iteration stopping, improving decoding speed.
Description
Technical field
The present invention relates to fields of communication technology, more particularly to a kind of Turbo code decoding iteration control method and device.
Background technique
Turbo code is a kind of channel coding technology of superior performance.Turbo code is by mutual iterative process in two components
External information is exchanged between decoder to obtain the raising of performance, the number of iterations is higher, and decoding performance is better, but simultaneously also can band
Carry out complexity raising, be delayed longer disadvantage.The communication system higher for transmission rate request, reduce decoding delay 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.Turbo code error performance is continuously improved with the increase of the number of iteration.But when reaching
To after certain the number of iterations, the performance of Turbo decoding is no longer improved with the increase of the number of iterations.At this point, continuing
Iteration can only increase decoding delay in vain, reduce the performance of Turbo decoding.Therefore, there are some iteration control methods
Stop Turbo decoder iteration in advance.But the method that Turbo code decoding iteration control in the prior art stops, generally depositing
In the complex problem of calculating process.
Summary of the invention
The technical issues of embodiment of the present invention solves is the process for how simplifying the stopping of Turbo code decoding iteration, and raising is translated
Code speed.
To solve the above problems, the embodiment of the invention provides a kind of Turbo code decoding iteration control method, the method
Include:
In working as previous iterative decoding process, when the component decoder of Turbo decoder, which executes corresponding operation, to be finished,
Obtain the external information of the component decoder output；
Calculate the mutual information of the external information of the component decoder output；
When determining that the mutual information of external information of the component decoder output meets preset condition, stop decoding and exporting
Decode result.
Optionally, the preset condition are as follows: mutual information of the component decoder in the external information when previous iteration output
Mean value, with difference of the component decoder between the mean value of the mutual information of the external information of default the number of iterations iteration output
Less than preset threshold value.
Optionally, the mutual information of the external information for calculating the component decoder output is executed using following formula
Operation:
Wherein, MI_flp indicates the component decoder output
The mutual information of external information, L indicate the external information of the component decoder output, and log indicates to seek logarithm the bottom of for 2.
Optionally, the mutual information of the external information for calculating the component decoder output is executed using following formula
The operation of mean value:
Wherein, MI_fxp indicates the external information of the component decoder output
The mean value of mutual information, LiIndicate the external information of i-th of bit of the component decoder output, N is described point that statistics obtains
The bit number of the external information of decoder output is measured, LUT | Li| indicate the external information of i-th of bit of the component decoder output
LiThe corresponding fixed point quantized value of mutual information.
Optionally, when the code block length of previous the number of iterations and decoding block is tabled look-up really according to the default the number of iterations
It is fixed.
Optionally, the preset threshold value is to be carried out really according to the demand of decoding performance and decoding iteration speed by emulation
It is fixed.
Optionally, the preset threshold value is 0.
The embodiment of the invention also provides a kind of Turbo code decoding iteration control device, described device includes:
Acquiring unit is suitable in working as previous iterative decoding process, when the component decoder of Turbo decoder executes accordingly
Operation when finishing, obtain the external information of the component decoder output；
Computing unit, the mutual information of the external information suitable for calculating the component decoder output；
Judging unit, suitable for judging whether the mutual information of external information of the component decoder output meets preset condition；
Control unit, suitable for when determining that the mutual information of external information of component decoder output meets preset condition,
Stop decoding and exports decoding result.
Optionally, the preset condition are as follows: when the corresponding component decoder output of previous iteration external information it is mutual
The mean value of information, between the mean value of the mutual information of the external information of component decoder output corresponding with preset the number of iterations
Difference be less than preset threshold value.
Optionally, the computing unit is suitable for executing the calculating component decoder output using following formula
The operation of the mutual information of external information:
Wherein, MI_flp indicates the component decoder output
The mutual information of external information, L indicate the external information of the component decoder output, and log indicates to seek logarithm the bottom of for 2.
Optionally, the computing unit, which is further adapted for executing using following formula, calculates the outer of the component decoder output
The operation of the mean value of the mutual information of information:
Wherein, MI_fxp indicates the external information of the component decoder output
The mean value of mutual information, LiIndicate the external information of i-th of bit of the component decoder output, N is described point that statistics obtains
The bit number of the external information of decoder output is measured, LUT | Li| indicate i-th of external information L of the component decoder outputiIt is mutual
The corresponding fixed point quantized value of information.
Optionally, when the code block length of previous the number of iterations and decoding block is tabled look-up according to the preset the number of iterations
It determines.
Optionally, the preset threshold value is to be carried out really according to the demand of decoding performance and decoding iteration speed by emulation
It is fixed.
Optionally, the preset threshold value is 0.
Compared with prior art, technical solution of the present invention has the advantage that
Above-mentioned scheme is finished and defeated by each component decoder in Turbo decoder executing corresponding operation
Out when corresponding external information bit, the external information of the component decoder output is obtained, and is translated in the component being calculated
When the mutual information of the external information of code device output meets preset condition, stop decoding and export to decode translating as a result, can simplify Turbo
The process of code improves decoding speed, and then the network throughput of communication system can be improved, and economize on resources.
Detailed description of the invention
Fig. 1 is the flow chart of one of embodiment of the present invention Turbo code decoding iteration control method；
Fig. 2 is the flow chart of another Turbo code decoding iteration control method in the embodiment of the present invention；
Fig. 3 is the structural schematic diagram of the Turbo code decoding iteration 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 is translated by Turbo
Each component decoder in code device obtains described point when the corresponding operation of execution finishes and exports corresponding external information bit
The external information of decoder output is measured, and default in the mutual information satisfaction of the external information for the component decoder output being calculated
When condition, stop decoding and exporting decoding as a result, can simplify the process of Turbo decoding, raising decoding speed can be improved logical
The network throughput of letter system, and economize on resources.
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 the Turbo code decoding iteration control method in the embodiment of the present invention.As described in Figure 1
Turbo code decoding iteration control method may include:
Step S101: it in previous iterative decoding process, is transported accordingly when the component decoder of Turbo decoder executes
When calculation finishes, the external information of the component decoder output is obtained.
Step S102: the mutual information of the external information of the component decoder output is calculated；
Step S103: when determining that the mutual information of external information of the component decoder output meets preset condition, stop
It decodes and exports decoding result.
The Turbo code decoding iteration control method in the embodiment of the present invention is made below in conjunction with Fig. 2 further details of
It introduces.
Step S201: it in previous iterative decoding process, is transported accordingly when the component decoder of Turbo decoder executes
When calculation finishes, the external information of the component decoder output is obtained.
In specific implementation, two component decoders interaction in Turbo decoder works alternatively, to received soft bit
Sequentially decoded.Wherein, during decoding, original information bits and prior information bit input the first component decoder,
Priori of first component decoder by updated external information bit after Turbo interleaver, as second component decoder
Information is sent into second component decoder.Second component decoder receives updated original information bits, second component decoder
Soft-decision exports updated external information bit, as the prior information of the first component decoder, then feeds back to the first component and translates
Code device.It can be seen that the first component decoder and second component decoder are being held every time in each iterative process of decoder
Row can export corresponding external information when finishing corresponding operation respectively.
In specific implementation, corresponding external information bit is exported after information of the component decoder to input is updated
When, obtain the external information bit of the component decoder output.
Step S202: the mutual information of the external information of the component decoder output is calculated.
In specific implementation, after the external information bit for getting component decoder output, the component can be calculated
The mutual information of the external information of decoder output.Wherein, in an embodiment of the present invention, it can be calculated using following formula
The mutual information of the external information of the component decoder output:
Wherein, MI_flp indicates that the mutual information of the external information of the component decoder output, L indicate the component decoder
The external information of output, log indicate to seek logarithm the bottom of for 2.
It is to be herein pointed out assuming that the bit number for the external information that the component decoder exports every time is N, wherein
The mutual information of the external information of each bit can be calculated using above-mentioned formula (1).
Meanwhile by formula (1) it is recognised that the outer letter of each bit in the external information of component decoder output
The mutual information of breath is floating number.Therefore, for the convenience of specific implementation, the mutual information of the external information of each bit can be carried out
Fixed point quantization, the mean value for obtaining the mutual information of N number of bit external information of the component decoder output can use following public affairs
Formula indicates:
Wherein, MI_fxp indicates the mean value of the mutual information of the external information of the component decoder output, LiIndicate described point
The external information of i-th of bit of decoder output is measured, N is the bit of the external information for the component decoder output that statistics obtains
Number, LUT | Li| indicate the external information L of i-th of bit of the component decoder outputiThe corresponding fixed point quantized value of mutual information.
It is to be herein pointed out being calculated mutually in the external information exported to the component decoder using formula (2)
When the mean value of information, the fixed point quantized value of the mutual information of the external information of each bit can pass through the mapping table of both inquiries
It obtains.
For example, when fixed point quantization bit wide is 6bit, the fixed point quantized value of the mutual information absolute value of external information such as 1 institute of table
Show:
Table 1
| |Li| | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7~31 |
| LUT|Li| | 0 | 5 | 15 | 22 | 27 | 29 | 30 | 31 |
It is to be herein pointed out the fixed point quantization bit wide of the mutual information of the external information of the component decoder output is by institute
The external information for stating component decoder output determines.
Step S203: judge the component decoder in the equal of the mutual information when the external information exported in previous iterative process
Whether value is small with difference of the component decoder between the mean value of the mutual information for the external information that preset the number of iterations exports
In preset threshold value；When the judgment result is yes, step S204 can be executed, conversely, can then execute step S205.
In an embodiment of the present invention, certain iteration before the preset the number of iterations is current iteration number,
It is determined by the code block length of current iteration number and decoding block, specific as shown in table 2:
Table 2
In specific implementation, the preset threshold value can carry out true according to the demand of decoding performance and decoding iteration speed
Fixed, specific numerical value can be determined according to simulation result.Wherein, when the threshold value of setting is bigger, the number of iterations of saving is got over
It is more, conversely, the number of iterations then saved is fewer.
In an embodiment of the present invention, the preset threshold value is 0, it is ensured that the case where decoding performance basic free of losses
Under, reduce the number of decoding iteration.
Step S204: stop decoding and export decoding result.
In specific implementation, in previous iterative process, the mutual information of the external information of the component decoder output is equal
Difference between the mean value of the mutual information of the external information of the component decoder of value and default the number of iterations output is less than default
Threshold value, control Turbo decoder stops decoding, and exports decoding result.
Step S205: continue to decode.
In specific implementation, in working as previous iterative process, when the mutual information of the external information of component decoder output
Difference between the mean value of the mutual information of mean value and the external information of the preset the number of iterations of component decoder output is greater than
When equal to preset threshold value, control Turbo decoder continues to decode.
It is to be herein pointed out executing phase in two component decoders in each iterative process of Turbo decoder
When the operation answered finishes and exports corresponding external information bit, it is performed both by each step of above-mentioned encoded control method, with true
Determine whether to stop decoding also to be to continue with decoding.
Specifically, after the first component decoder exports external information bit, when determining first by corresponding operation
The mean value of the mutual information of the external information of component decoder output, the outer letter exported with the first component decoder in default the number of iterations
Difference between the mean value of the mutual information of breath is less than preset threshold value, and control Turbo decoder stops decoding and exporting decoding knot
Fruit.Conversely, the external information bit then exported the first component decoder by Turbo interleaver is after interweaving, as second point
The prior information for measuring decoder is sent into second component decoder, and second component decoder receives updated original information bits,
Second component decoder soft-decision exports updated external information bit.
Then, using the encoded control method in the embodiment of the present invention, the outer letter of second component decoder output is got
When breath, when the mutual information for the external information for determining the output of second component decoder by operation, with second component decoder default
Difference between the mean value of the mutual information of the external information of the number of iterations output is less than preset threshold value, and control Turbo decoder stops
It only decodes and exports decoding result.Conversely, interative computation next time is carried out, until the external information of the first component decoder output
Mutual information mean value, with the first component decoder between the mean value of the mutual information of the external information of default the number of iterations output
Difference is less than the mutual information of the external information of preset threshold value or the output of second component decoder, exists with second component decoder
Difference between the mean value of the mutual information of the external information of default the number of iterations output is less than preset threshold value.
It will make further details of introduction to the above-mentioned corresponding device of method below.
Fig. 3 shows the structural schematic diagram of one of embodiment of the present invention Turbo code decoding iteration control device.Such as figure
Turbo code decoding iteration control device 300 shown in 3 may include acquiring unit 301, computing unit 302, judging unit 303
With control unit 304, in which:
Acquiring unit 301 is suitable in working as previous iterative decoding process, when the component decoder of Turbo decoder executes
When corresponding operation finishes, the external information of the component decoder output is obtained.Wherein, the component decoder is translated for Turbo
The first component decoder or second component decoder of code device.
Computing unit 302, the mutual information of the external information suitable for calculating the component decoder output.
In specific implementation, the computing unit 302 is suitable for being executed the calculating component using following formula and translated
The operation of the mutual information of the external information of code device output:
Wherein, MI_flp indicates the component decoder output
The mutual information of external information, L indicate the external information of the component decoder output, and log indicates to seek logarithm the bottom of for 2.
In specific implementation, the computing unit 302, which is further adapted for executing using following formula, calculates the component decoding
The operation of the mean value of the mutual information of the external information of device output:
Wherein, MI_fxp indicates the external information of the component decoder output
The mean value of mutual information, LiIndicate the external information of i-th of bit of the component decoder output, N is described point that statistics obtains
The bit number of the external information of decoder output is measured, LUT | Li| indicate i-th of bit external information L of the component decoder outputi
The corresponding fixed point quantized value of mutual information.
Judging unit 303, whether the mutual information of the external information suitable for the component decoder output for judging to be calculated
Meet preset condition.
In specific implementation, the preset condition are as follows: the component decoder is in the external information when previous iteration output
The difference of the mean value of mutual information and the component decoder in the mean value of the mutual information of the external information of default the number of iterations iteration output
Value is less than preset threshold value.
In specific implementation, when the code block of previous the number of iterations and decoding block is long according to the preset the number of iterations
Spend determination of tabling look-up.
In specific implementation, the preset threshold value can pass through imitative according to the demand of decoding performance and decoding iteration speed
Really it is determined.Wherein, in an embodiment of the present invention, preset threshold value is 0.
Control unit 304, the mutual information suitable for the external information when the component decoder output being calculated meet pre-
If when condition, stopping decoding and exporting decoding result.
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 (9)
1. a kind of Turbo code decoding iteration control method characterized by comprising
In previous iterative decoding process, when the component decoder of Turbo decoder, which executes corresponding operation, to be finished, obtain
The external information of the component decoder output；
Calculate the mutual information of the external information of the component decoder output；
When determining that the mutual information of external information of the component decoder output meets preset condition, stops decoding and export decoding
As a result；
Wherein, the operation of the mutual information of the external information for calculating the component decoder output is executed using following formula:
Wherein, MI_flp indicates the outer letter of the component decoder output
The mutual information of breath, L indicate the external information of the component decoder output, and log indicates to seek logarithm the bottom of for 2；
The preset condition are as follows: the component decoder when previous iteration output external information mutual information mean value, with institute
Difference of the component decoder between the mean value of the mutual information of the external information of default the number of iterations iteration output is stated less than preset
Threshold value.
2. Turbo code decoding iteration control method according to claim 1, which is characterized in that held using following formula
Row calculates the operation of the mean value of the mutual information of the external information of the component decoder output:
Wherein, MI_fxp indicates the mean value of the mutual information of the external information of the component decoder output, LiIndicate that the component is translated
The external information of i-th of bit of code device output, N are the bit numbers of the external information for the component decoder output that statistics obtains,
LUT|Li| indicate the external information L of i-th of bit of the component decoder outputiThe corresponding fixed point quantized value of mutual information.
3. Turbo code decoding iteration control method according to claim 2, which is characterized in that the default the number of iterations
According to table look-up determination when the code block length of previous the number of iterations and decoding block.
4. Turbo code decoding iteration control method according to claim 1, which is characterized in that the preset threshold value is
It is determined according to the demand of decoding performance and decoding iteration speed by emulation.
5. Turbo code decoding iteration control method according to claim 4, which is characterized in that the preset threshold value is
0。
6. a kind of Turbo code decoding iteration control device characterized by comprising
Acquiring unit is suitable for transporting accordingly in previous iterative decoding process when the component decoder of Turbo decoder executes
When calculation finishes, the external information of the component decoder output is obtained；
Computing unit, the mutual information of the external information suitable for calculating the component decoder output；
Judging unit, suitable for judging whether the mutual information of external information of the component decoder output meets preset condition；
Control unit, suitable for stopping when determining that the mutual information of external information of the component decoder output meets preset condition
It decodes and exports decoding result；
Wherein, the computing unit is suitable for executing the external information for calculating the component decoder output using following formula
Mutual information operation:
Wherein, MI_flp indicates the outer letter of the component decoder output
The mutual information of breath, L indicate the external information of the component decoder output, and log indicates to seek logarithm the bottom of for 2；
The preset condition are as follows: the component decoder when previous iteration output external information mutual information mean value, with institute
Difference of the component decoder between the mean value of the mutual information of the external information of default the number of iterations iteration output is stated less than preset
Threshold value.
7. Turbo code decoding iteration control device according to claim 6, which is characterized in that the computing unit is also suitable
In the operation of the mean value of the mutual information for the external information for executing the calculating component decoder output using following formula:
Wherein, MI_fxp indicates the mutual trust of the external information of the component decoder output
The mean value of breath, LiIndicate the external information of i-th of bit of the component decoder output, N is that the component that statistics obtains is translated
The bit number of the external information of code device output, LUT | Li| indicate the external information L of i-th of bit of the component decoder outputi's
The corresponding fixed point quantized value of mutual information.
8. Turbo code decoding iteration control device according to claim 6, which is characterized in that the default the number of iterations
According to table look-up determination when the code block length of previous the number of iterations and decoding block.
9. Turbo code decoding iteration control device according to claim 8, which is characterized in that the preset threshold value is
0。
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