闊永紅 曾偉濤 陳 健

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基于概率逼近的本原BCH碼編碼參數(shù)的盲識(shí)別方法

闊永紅*曾偉濤 陳 健

(西安電子科技大學(xué)通信工程學(xué)院 西安 710071)

針對本原BCH碼編碼參數(shù)的盲識(shí)別問題，該文提出了一種基于概率逼近的盲識(shí)別方法。首先，利用Gauss分布和Poisson分布逼近隨機(jī)碼字的根概率特性，確定了搜索BCH碼長的門限；然后，通過分析本原域元素的檢錯(cuò)能力及同構(gòu)對域的影響，應(yīng)用臨近域?qū)Φ姆椒ù_定編碼域，提高了其識(shí)別能力；最后，給出識(shí)別生成多項(xiàng)式時(shí)的共軛根系表，從而減少了計(jì)算量。仿真結(jié)果表明，在較高的誤碼率下，該方法能快速地識(shí)別出BCH碼編碼所采用的編碼參數(shù)。

信道編碼；BCH碼；共軛根系；盲識(shí)別

1 引言

2 BCH碼定義及分析

2.1 BCH碼定義及分析

2.2 概率分布特性的逼近

3 BCH編碼盲識(shí)別的實(shí)現(xiàn)

3.1 用于域間搜索的門限定義

3.2 算法描述

圖1 誤碼率與誤碼碼字比例的關(guān)系

表1部分臨近域?qū)?/p>

(203,253)(607,895)(701,647)(827,607) (425,333)(761,539)(859,761)(911,787)

4 仿真分析

4.1 仿真實(shí)驗(yàn)與復(fù)雜度分析

4.2 仿真性能

表2算法的復(fù)雜度分析

文獻(xiàn)[10]文獻(xiàn)[11]本文所提算法 m=h m=9 m=3

圖3 不同碼長在各種誤碼率下的識(shí)別率

5 結(jié)束語

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闊永紅： 女，1967年生，博士，教授，研究方向?yàn)橹悄苄盘柼幚?

曾偉濤： 男，1988年生，碩士生，研究方向?yàn)橥ㄐ啪幋a識(shí)別技術(shù).

陳 ?。?男，1968年生，教授，博士生導(dǎo)師，研究方向?yàn)橥ㄐ艑?、認(rèn)知網(wǎng)絡(luò).

Blind Identification of Primitive BCH Codes Parameters Based on Probability Approximation

Kuo Yong-hong Zeng Wei-tao Chen Jian

(,,,710071,)

To solve the issues of blind identification of primitive BCH codes encoding parameters, a novel identification algorithm with probability approximation is presented. Frist, by taking advantage of the approximation of random code words’ root probability character which uses Gaussian distribution and Poisson distribution, the thresholds for searching code length are structured. Second, though analyzing the checking ability of the primitive element and the impact of isomorphism on searching, the coding filed is determined by using the method of nearby fields pair which improves the performace of identification. Finally, the calculation is reduced by creating and using the conjugate roots table in the recognition of generator polynomial. Simulation results show that, the proposed algorithm achieves a significant improvement in identification probability even if in high BER situation.

Channel coding; BCH codes; Conjugate roots; Blind identification

TP391;TN911.22

A

1009-5896(2014)02-0332-08

10.3724/SP.J.1146.2013.00584

闊永紅 yhkuo@mail.xidian.edu.cn

2013-04-27收到，2013-07-27改回

國家自然科學(xué)基金(60972072)和高等學(xué)校學(xué)科創(chuàng)新引智計(jì)劃(B08038)資助課題