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A zero-returning turbo code starting point and depth blind recognition method

A technology of blind recognition and starting point, applied in coding, code conversion, coding components, etc., can solve the problem of increasing the calculation amount of identification work, and achieve the effect of reducing the amount of calculation and improving the calculation efficiency.

Active Publication Date: 2019-03-12
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Uncertainty in these parameters is a common factor that increases the amount of recognition work

Method used

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  • A zero-returning turbo code starting point and depth blind recognition method
  • A zero-returning turbo code starting point and depth blind recognition method
  • A zero-returning turbo code starting point and depth blind recognition method

Examples

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Embodiment 1

[0031] The purpose of this embodiment is to simulate the success rate of parameter blind recognition under the conditions of different interleaving depths and different bit error rates. Take 1 / 3 code rate, PCCC structure, and two-component encoder parameters as [13,15] as an example. Adjust the bit error rate under the condition of interleaving depth 200, record the recognition success rate, and get figure 2 . It can be seen that with the increase of the bit error rate, the recognition success rate gradually decreases, but the method has quite good anti-error performance on the whole. Adjust the interleaving depth under the condition of bit error rate 2.5%, record the recognition success rate, and get image 3 . It can be seen that the interleaving depth has little effect on the recognition success rate, which is the theoretical basis for this method to be suitable for large interleaving depths.

Embodiment 2

[0033] The purpose of this embodiment is to study the recognition performance of this method under different component encoder parameters. Also taking the PCCC structure with the same code rate of 1 / 3 and the same two-component encoder as an example, 682 generator polynomials between [101,103] and [177,175] were explored. Under the conditions of interleaving depth of 200 and bit error rate of 2.5%, the recognition success rate of each coding polynomial is classified and counted, and the results are as follows Figure 4 .

[0034] It can be seen that the recognition probability of most component encoders is above 85%. In fact, due to the rule that the recognition success rate varies with the bit error rate shown in Example 1, the recognition success rate of most component encoders can achieve very ideal results on the order of 0.1% that is common in practice. In order to highlight that the recognition performance of different component encoders will be slightly different, the...

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Abstract

The invention belongs to the field of blind recognition of turbo code interleaving parameters, and in particular relates to a method for performing interleaving seven points and interleaving depth estimation method for a return-to-zero turbo code in the case of a large interleaving depth (hundreds to several thousand). The method for identifying the depth of the interleaver and the starting point based on the return-to-zero structure of the present invention utilizes the self-return-to-zero structure of the convolution coding that widely exists in practical applications. Under this structure, no matter it is a return-to-zero bit or a coding sequence with an all-zero state as the initial state, there are certain structural characteristics. Through the statistics of the code word sequence, the position of the code word conforming to the specific structure is found, so as to determine the interleaving depth and starting point of the Turbo code. The method of the invention greatly reduces the calculation amount of the turbo code parameter blind identification algorithm, and avoids the step of being forced to adopt multiple nested calculations for multiple unknowns during full blind identification. The recognition process is separated and parameterized one by one, so that while improving the operation efficiency, it also makes the recognition of large interleaving depth practical and operable.

Description

technical field [0001] The invention belongs to the field of blind recognition of turbo code interleaving parameters, and in particular relates to a method for performing interleaving seven points and interleaving depth estimation method for a return-to-zero turbo code in the case of a large interleaving depth (hundreds to several thousand). Background technique [0002] According to Shannon's theorem, as long as the signaling rate is lower than the channel capacity, as the code length approaches infinity, there must be a progressive number whose error rate approaches zero. The Turbo code encoding and decoding scheme proposed in 1993, by making full use of randomness, under the condition of 65536 random interleaver, makes the 1 / 2 code rate Turbo code realize the excellent performance of only 0.7dB away from the Shannon limit. Since then, Turbo codes have been widely used in the field of wireless communication. The significance of Turbo code is to provide a concatenated codi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03M13/29
CPCH03M13/2957
Inventor 朱胜利东阳甘露廖红舒
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA