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Soft-bit-based blind identification method for Turbo code interleaver

A technology of soft bit and blind recognition, which is applied in the field of blind recognition of Turbo code interleaver, can solve the problems of no error code, low error rate and inapplicability in the communication system, and achieve the effect of simple recognition method, improved recognition rate and fast recognition speed

Active Publication Date: 2017-02-15
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

In the case of no bit error, this method can effectively restore the interleaving relationship, but in the real environment, the probability of no bit error in the communication system is extremely low, this method is not applicable

Method used

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  • Soft-bit-based blind identification method for Turbo code interleaver
  • Soft-bit-based blind identification method for Turbo code interleaver
  • Soft-bit-based blind identification method for Turbo code interleaver

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Embodiment

[0036] Such as figure 1 Shown, a kind of blind identification method based on the Turbo code interleaver of soft bit comprises the following steps:

[0037] Step 1 is according to the received soft bit data, intercepts the Turbo code soft bit that each frame length of M frame wherein is L;

[0038] The soft bit refers to the bit information after the signal is demodulated by the soft decision of the constellation diagram;

[0039] The interception refers to fetching data from the starting position of the frame;

[0040] The M is an experience value, which can be obtained by referring to the attached table 1;

[0041] Table 1

[0042]

[0043] Step 2, construct a check vector according to the generator polynomial of the turbo code component encoder:

[0044] p a ={0,-1,...,-d},p b ={0,-1,...,-d}

[0045] Described turbo code component encoder generally refers to recursive systematic convolutional code (RSC);

[0046] The generator polynomial generally refers to the ...

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Abstract

The invention discloses a soft-bit-based blind identification method for a Turbo code interleaver. With soft bit information, a checking vector is constructed; all positions of an interleaver are separated by using the feature of the checking vector; and the interleaver is recovered bit by bit. The method is suitable for a communication system in a real environment. An interwoven relation can be identified at a high error rate. Moreover, the method has characteristics of simple algorithm, low complexity, and fast identification speed.

Description

technical field [0001] The invention relates to the fields of intelligent communication and information confrontation, in particular to a blind recognition method of a turbo code interleaver based on soft bits. Background technique [0002] As an important forward error correction code in the communication channel, Turbo code has been widely used in 3G and 4G communication standards because of its excellent characteristics close to the limit of Shannon theory. At present, more and more fields involve Turbo code blind recognition technology, Turbo code blind recognition technology has also become the forefront of today's communication research. The structure of the classic parallel concatenated Turbo code encoder is as follows: figure 2 As shown, it is mainly formed by parallel cascading of two recursive systematic convolutional code (RSC) encoders, and the convolutional code encoders are connected by an interleaver. Generally, each RSC encoder has the same structure. [00...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M13/27H03M13/29H04L1/00
Inventor 胡斌杰谭妥
Owner SOUTH CHINA UNIV OF TECH
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