CN106533454A - Decoding and iteration control method and device for Turbo codes - Google Patents
Decoding and iteration control method and device for Turbo codes Download PDFInfo
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Abstract
The invention discloses a decoding and iteration control method and a decoding and iteration control device for Turbo codes. The method comprises the steps of during a current iteration and decoding process, when corresponding operation executed by a component decoder of a Turbo decoder is completed, acquiring external information output by the component decoder; computing mutual information of the external information output by the component decoder; and when the mutual information of the external information output by the component decoder meets a preset condition is determined, stopping decoding and outputting a decoding result. According to the scheme of the method and the device provided by the invention, a decoding and iteration stopping process of the Turbo codes can be simplified, and a decoding speed can be improved.
Description
Technical field
The present invention relates to communication technical field, more particularly to a kind of Turbo code decoding iteration control method and
Device.
Background technology
Turbo code is a kind of channel coding technology of superior performance.Turbo code is existed by mutual iterative process
Exchange external information to obtain the raising of performance between two component decoders, iterations is higher, decoding
Performance is better, but while also brings along complexity raising, the longer shortcoming of time delay.For transfer rate will
Higher communication system, the time delay of reduction decoding and balance decoding delay and decoding performance is asked to have 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.Turbo code error performance is with repeatedly
The increase of the number of times in generation is improved constantly.But, after certain iterations is reached, the property of Turbo decodings
No longer can improve with the increase of iterations.Now, proceeding iteration only can increase decoding in vain
Time delay, reduces the performance of Turbo decodings.Therefore, occur in that some iteration control methods to stop in advance
Turbo decoder iterations.But, the method that Turbo code decoding iteration control of the prior art stops, one
As there is a problem that calculating process is complex.
The content of the invention
The technical problem that the embodiment of the present invention is solved is the process for how simplifying the stopping of Turbo code decoding iteration,
Improve decoding speed.
For solving the above problems, a kind of Turbo code decoding iteration control method is embodiments provided,
Methods described includes：
Working as in previous iterative decoding process, when the component decoder of Turbo decoders performs corresponding fortune
When calculation is finished, the external information of the component decoder output is obtained；
Calculate the mutual information of the external information of the component decoder output；
When it is determined that the mutual information of external information of component decoder output meets pre-conditioned, stop translating
Code simultaneously exports decoding result.
Alternatively, it is described pre-conditioned to be：The component decoder is when the external information of previous iteration output
Mutual information average, with the component decoder default iterations iteration output external information it is mutual
Difference between the average of information is less than default threshold value.
Alternatively, the external information for calculating the component decoder output is performed using formula below
The operation of mutual information：
Wherein, MI_flp represents the component decoder output
External information mutual information, L represents the external information of component decoder output, and log is represented with 2 as bottom
Seek logarithm.
Alternatively, the external information for calculating the component decoder output is performed using formula below
The operation of the average of mutual information：
Wherein, MI_fxp represents the outer letter of the component decoder output
The average of the mutual information of breath, LiThe external information of i-th bit of the component decoder output is represented, N is
The bit number of the external information of the component decoder output that statistics is obtained, LUT | Li| represent that the component is translated
External information L of i-th bit of code device outputiThe corresponding fixed point quantized value of mutual information.
Alternatively, when the code block of previous iterations and decoding block is long according to the default iterations
Spend determination of tabling look-up.
Alternatively, the default threshold value is by imitative according to the demand of decoding performance and decoding iteration speed
Really it is determined.
Alternatively, the default threshold value is 0.
The embodiment of the present invention additionally provides a kind of Turbo code decoding iteration control device, and described device includes：
Acquiring unit, is suitable to working as in previous iterative decoding process, when the component of Turbo decoders is decoded
When the corresponding computing of device execution is finished, the external information of the component decoder output is obtained；
Computing unit, is suitable to calculate the mutual information of the external information that the component decoder is exported；
Judging unit, is suitable to judge whether the mutual information of the external information of the component decoder output meets pre-
If condition；
Control unit, is suitable to meet default when the mutual information of the external information for determining the component decoder output
During condition, stopping is decoded and exports decoding result.
Alternatively, it is described pre-conditioned to be：When outside the corresponding component decoder output of previous iteration
The average of the mutual information of information, the outer letter of the component decoder output corresponding with default iterations
Difference between the average of the mutual information of breath is less than default threshold value.
Alternatively, the computing unit is suitable for use with formula below and performs the calculating component decoding
The operation of the mutual information of the external information of device output：
Wherein, MI_flp represents the component decoder output
External information mutual information, L represents the external information of component decoder output, and log is represented with 2 as bottom
Seek logarithm.
Alternatively, the computing unit is further adapted for being performed using formula below and calculates the component decoder
The operation of the average of the mutual information of the external information of output：
Wherein, MI_fxp represents the outer letter of the component decoder output
The average of the mutual information of breath, LiThe external information of i-th bit of the component decoder output is represented, N is
The bit number of the external information of the component decoder output that statistics is obtained, LUT | Li| represent that the component is translated
I-th external information L of code device outputiThe corresponding fixed point quantized value of mutual information.
Alternatively, when previous iterations and the code block of decoding block according to the default iterations
Length is tabled look-up determination.
Alternatively, the default threshold value is by imitative according to the demand of decoding performance and decoding iteration speed
Really it is determined.
Alternatively, the default threshold value is 0.
Compared with prior art, technical scheme has the following advantages that：
Above-mentioned scheme, is performing corresponding computing by each component decoder in Turbo decoders
When finishing and export corresponding external information bit, the external information of the acquisition component decoder output, and
When the mutual information of the external information of the calculated component decoder output meets pre-conditioned, stop translating
Code simultaneously exports decoding result, can simplify the process of Turbo decodings, improves decoding speed, and then can be with
The network throughput of communication system is improved, and is economized on resources.
Description of the drawings
Fig. 1 is a kind of flow chart of the Turbo code decoding iteration control method in the embodiment of the present invention；
Fig. 2 is the flow chart of another kind of Turbo code decoding iteration control method in the embodiment of the present invention；
Fig. 3 is the structural representation of the Turbo code decoding iteration control device in the embodiment of the present invention.
Specific embodiment
For solving the above-mentioned problems in the prior art, the technical scheme that the embodiment of the present invention is adopted passes through
Each component decoder in Turbo decoders is finished and exports corresponding outer letter in the corresponding computing of execution
The external information of the component decoder output during breath bit, is obtained, and is translated in the calculated component
When the mutual information of the external information of code device output meets pre-conditioned, stopping decodes and exports decoding result, can
To simplify the process of Turbo decodings, decoding speed is improved, the network throughput of communication system can be improved,
And economize on resources.
It is understandable for enabling 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 the Turbo code decoding iteration control method in the embodiment of the present invention.Such as
Turbo code decoding iteration control method described in Fig. 1, can include：
Step S101：Working as in previous iterative decoding process, when the component decoder of Turbo decoders is held
When the corresponding computing of row is finished, the external information of the component decoder output is obtained.
Step S102：Calculate the mutual information of the external information of the component decoder output；
Step S103：When it is determined that the mutual information of external information of component decoder output meets pre-conditioned
When, stopping is decoded and exports decoding result.
The Turbo code decoding iteration control method in the embodiment of the present invention is made into one below in conjunction with Fig. 2
The detailed introduction of step.
Step S201：Working as in previous iterative decoding process, when the component decoder of Turbo decoders is held
When the corresponding computing of row is finished, the external information of the component decoder output is obtained.
In being embodied as, two component decoder interaction alternations in Turbo decoders, to receiving
Soft bit sequentially enter row decoding.Wherein, during decoding, original information bits and prior information ratio
The first component decoder of special input, the first component decoder is by the external information bit after renewal through Turbo
After interleaver, second component decoder is sent into as the prior information of second component decoder.Second component
Decoder receives the original information bits after updating, outer after the output renewal of second component decoder soft-decision
Information bit, as the prior information of the first component decoder, then feeds back to the first component decoder.By
This is visible, and in each iterative process of decoder, the first component decoder and second component decoder are every
It is secondary to export corresponding external information when corresponding computing is finished respectively.
In being embodied as, the corresponding outer letter of output after component decoder is updated to the information being input into
During breath bit, the external information bit of the component decoder output is obtained.
Step S202：Calculate the mutual information of the external information of the component decoder output.
In being embodied as, after the external information bit for getting component decoder output, can calculate
The mutual information of the external information of the component decoder output.Wherein, in an embodiment of the present invention, can be with
The mutual information of the external information of the component decoder output is calculated using formula below：
Wherein, MI_flp represents the mutual information of the external information of the component decoder output, and L represents described
The external information of component decoder output, log are represented with 2 the bottom of as and seek logarithm.
It is to be herein pointed out assume that the bit number of the external information that the component decoder is exported 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 component decoder output external information in each
The mutual information of the external information of bit is floating number.Therefore, for the convenience for implementing, can be by each
The mutual information of the external information of bit carries out fixed point quantization, obtains N number of bit of the component decoder output
The average of the mutual information of external information can be represented using formula below：
Wherein, MI_fxp represents the average of the mutual information of the external information of the component decoder output, LiTable
Show the external information of i-th bit of the component decoder output, N is the component decoding that statistics is obtained
The bit number of the external information of device output, LUT | Li| represent i-th bit of the component decoder output
External information LiThe corresponding fixed point quantized value of mutual information.
It is to be herein pointed out being counted using formula (2) in the external information exported to the component decoder
When calculation obtains the average of mutual information, the fixed point quantized value of the mutual information of the external information of each bit can pass through
Inquire about the mapping table of the two to draw.
For example, as a width of 6bit of fixed point quantization, the fixed point quantized value of the mutual information absolute value of external information
As shown in table 1：
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 of the mutual information of the external information of the component decoder output quantifies
Bit wide is determined by the external information that the component decoder is exported.
Step S203：Judge the component decoder mutual when the external information that exports in previous iterative process
The average of information, the mutual information of the external information exported in default iterations with the component decoder
Whether the difference between average is less than default threshold value；When judged result for be when, can with execution step S204,
Conversely, then can be with execution step S205.
In an embodiment of the present invention, the default iterations be current iteration number of times before certain
Iteration, which is determined by the code block length of current iteration number of times and decoding block, concrete as shown in table 2：
Table 2
In being embodied as, the default threshold value can be according to decoding performance and the need of decoding iteration speed
Ask and be determined, specific numerical value can be determined according to simulation result.Wherein, the threshold value of setting is got over
When big, the iterations of saving is more, conversely, the iterations then saved is fewer.
In an embodiment of the present invention, the default threshold value is 0, it is ensured that decoding performance is substantially lossless
In the case of mistake, the number of times of decoding iteration is reduced.
Step S204：Stopping is decoded and exports decoding result.
In being embodied as, when when in previous iterative process, the external information of the component decoder output
The average of the mutual information of the external information of the component decoder output of mutual information average and default iterations
Between difference be less than default threshold value, control Turbo decoders stop decoding, and export decoding result.
Step S205：Continue decoding.
In being embodied as, working as in previous iterative process, when the external information of component decoder output
Mutual information average and the component decoder default iterations output external information mutual information
When difference between average is more than or equal to default threshold value, control Turbo decoders continue decoding.
It is to be herein pointed out in each iterative process of Turbo decoders, translating in two components
When the corresponding computing of code device execution is finished and exports corresponding external information bit, above-mentioned decoding control is performed both by
Each step of method processed, to determine whether that stopping decoding being also to continue with decoding.
Specifically, after the first component decoder output external information bit, when by corresponding computing,
Determine the average of the mutual information of the external information of the first component decoder output, with the first component decoder pre-
If the difference between the average of the mutual information of the external information of iterations output is less than default threshold value, control
Turbo decoders stop decoding and exporting decoding result.Conversely, then by Turbo interleavers by the first component
The external information bit of decoder output is sent into as the prior information of second component decoder after intertexture
Second component decoder, second component decoder receive the original information bits after updating, and second component is translated
External information bit after the soft-decision output renewal of code device.
Then, using the encoded control method in the embodiment of the present invention, get second component decoder defeated
During the external information for going out, when by computing determine second component decoder output external information mutual information, with
Difference of the second component decoder between the average of the mutual information of the external information of default iterations output is little
In default threshold value, control Turbo decoders stop decoding and exporting decoding result.Conversely, carrying out down
Interative computation once, until the average of the mutual information of the external information of the first component decoder output, with the
Difference of one component decoder between the average of the mutual information of the external information of default iterations output is less than
Default threshold value, or the mutual information of the external information of second component decoder output, are decoded with second component
Difference of the device between the average of the mutual information of the external information of default iterations output is less than default threshold value.
Further details of introduction will be made to the above-mentioned corresponding device of method below.
Fig. 3 shows that a kind of structure of the Turbo code decoding iteration control device in the embodiment of the present invention is shown
It is intended to.Turbo code decoding iteration control device 300 as shown in Figure 3, can include acquiring unit 301,
Computing unit 302, judging unit 303 and control unit 304, wherein：
Acquiring unit 301, is suitable to working as in previous iterative decoding process, when the component of Turbo decoders is translated
When the corresponding computing of code device execution is finished, the external information of the component decoder output is obtained.Wherein, institute
State the first component decoder or second component decoder that component decoder is Turbo decoders.
Computing unit 302, is suitable to calculate the mutual information of the external information that the component decoder is exported.
In being embodied as, the computing unit 302 is suitable for use with formula below and performs the calculating institute
State the operation of the mutual information of the external information of component decoder output：
Wherein, MI_flp represents the component decoder output
External information mutual information, L represents the external information of component decoder output, and log is represented with 2 as bottom
Seek logarithm.
In being embodied as, the computing unit 302 is further adapted for being performed using formula below and calculates described
The operation of the average of the mutual information of the external information of component decoder output：
Wherein, MI_fxp represents the outer letter of the component decoder output
The average of the mutual information of breath, LiThe external information of i-th bit of the component decoder output is represented, N is
The bit number of the external information of the component decoder output that statistics is obtained, LUT | Li| represent that the component is translated
I-th bit external information L of code device outputiThe corresponding fixed point quantized value of mutual information.
Judging unit 303, is suitable to judge the mutual trust of the external information of the calculated component decoder output
Whether breath meets pre-conditioned.
It is in being embodied as, described pre-conditioned to be：The component decoder is when previous iteration output
The external information that the average of the mutual information of external information is exported in default iterations iteration with the component decoder
Mutual information average difference be less than default threshold value.
In being embodied as, when previous iterations and decoding block according to the default iterations
Code block length table look-up determination.
In being embodied as, the default threshold value can be according to decoding performance and the need of decoding iteration speed
Ask and be determined by emulation.Wherein, in an embodiment of the present invention, default threshold value is 0.
Control unit 304, is suitable to the mutual information of the external information when the calculated component decoder output
When meeting pre-conditioned, stopping is decoded and exports decoding result.
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 (13)
1. a kind of Turbo code decoding iteration control method, it is characterised in that include：
Working as in previous iterative decoding process, when the component decoder of Turbo decoders performs corresponding computing
When finishing, the external information of the component decoder output is obtained；
Calculate the mutual information of the external information of the component decoder output；
When it is determined that the mutual information of external information of component decoder output meets pre-conditioned, stop decoding
And export decoding result.
2. Turbo code decoding iteration control method according to claim 1, it is characterised in that described pre-
If condition is：Average of the component decoder in the mutual information of the external information when previous iteration output,
With the component decoder the mutual information of the external information of default iterations iteration output average it
Between difference be less than default threshold value.
3. Turbo code decoding iteration control method according to claim 2, it is characterised in that using such as
Under formula perform the external information for calculating component decoder output mutual information operation：
Wherein, MI_flp represents the component decoder output
External information mutual information, L represents the external information of component decoder output, and log is represented with 2
Logarithm is sought the bottom of for.
4. Turbo code decoding iteration control method according to claim 3, it is characterised in that using such as
Under formula perform the external information for calculating component decoder output mutual information average operation：
Wherein, MI_fxp represents the outer letter of the component decoder output
The average of the mutual information of breath, LiRepresent the outer letter of i-th bit of the component decoder output
Breath, N is the bit number of the external information of the component decoder output that statistics is obtained, LUT | Li| represent
External information L of i-th bit of the component decoder outputiThe corresponding fixed point quantized value of mutual information.
5. Turbo code decoding iteration control method according to claim 4, it is characterised in that described pre-
If when the code block length of previous iterations and decoding block is tabled look-up determination according to iterations.
6. Turbo code decoding iteration control method according to claim 2, it is characterised in that described pre-
If threshold value be to be determined by emulation according to the demand of decoding performance and decoding iteration speed.
7. Turbo code decoding iteration control method according to claim 6, it is characterised in that described pre-
If threshold value be 0.
8. a kind of Turbo code decoding iteration control device, it is characterised in that include：
Acquiring unit, is suitable to working as in previous iterative decoding process, when the component decoder of Turbo decoders
When performing corresponding computing and finishing, the external information of the component decoder output is obtained；
Computing unit, is suitable to calculate the mutual information of the external information that the component decoder is exported；
Judging unit, is suitable to judge whether the mutual information of the external information of the component decoder output meets default
Condition；
Control unit, is suitable to meet default bar when the mutual information of the external information for determining the component decoder output
During part, stopping is decoded and exports decoding result.
9. Turbo code decoding iteration control device according to claim 8, it is characterised in that described pre-
If condition is：Average of the component decoder in the mutual information of the external information when previous iteration output,
With the component decoder the mutual information of the external information of default iterations iteration output average it
Between difference be less than default threshold value.
10. Turbo code decoding iteration control device according to claim 9, it is characterised in that the meter
Calculate unit and be suitable for use with the external information that formula below performs the calculating component decoder output
Mutual information operation：
Wherein, MI_flp represents the component decoder output
External information mutual information, L represents the external information of component decoder output, and log is represented with 2
Logarithm is sought the bottom of for.
11. Turbo code decoding iteration control devices according to claim 10, it is characterised in that described
Computing unit is further adapted for performing the external information for calculating the component decoder output using formula below
Mutual information average operation：
Wherein, MI_fxp represents the outer letter of the component decoder output
The average of the mutual information of breath, LiRepresent the external information of i-th bit of the component decoder output, N
It is the bit number of the external information of the component decoder output that statistics is obtained, LUT | Li| represent described point
External information L of i-th bit of amount decoder outputiThe corresponding fixed point quantized value of mutual information.
12. Turbo code decoding iteration control devices according to claim 9, it is characterised in that described pre-
If when the code block length of previous iterations and decoding block is tabled look-up determination according to iterations.
13. Turbo code decoding iteration control devices according to claim 12, it is characterised in that described
Default threshold value is 0.
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