2020 年 1 月 Journal on Communications January 2020
第 41 卷第 1 期 通 信 学 报 Vol.41
No.1
基于平均余弦符合度下的本原 BCH 码盲识别
吴昭军
1
,张立民
1
,钟兆根
2
,龙玉峰
3
(1. 海军航空大学信息融合研究所,山东 烟台 264001;2. 海军航空大学航空基础学院,山东 烟台 264001;
3. 海军航空大学 310 教研室,山东 烟台 264001)
摘 要:为克服现有 BCH 码识别算法在低信噪比下适应性差的缺点,提出了一种基于平均余弦符合度的识别算
法。首先遍历可能的码长值以及 m 级本原多项式域,进行初始码根校验匹配,从而完成码长识别;然后在识别出
码长前提下,遍历 m 级本原多项式下的 GF(2
m
)域,其最强纠错能力的本原多项式即为 GF(2
m
)域生成多项式;最
后求取所有连续码根最小多项式对应的最小公倍式,完成编码生成多项式识别。在校验匹配过程中,引入了平均
余弦符合度统计量,基于软判决下符合度的统计特性以及最小错误判决准则求解出最优门限,从而实现本原 BCH
码参数快速识别。仿真结果表明,推导的符合度统计特性与实际情况一致,所提算法能在低信噪比下有效完成参
数识别,同时具有较好的低信噪比适应能力,在信噪比为 5 dB,码长为 511 的条件下,能够完成参数的可靠识别,
与目前算法相比,所提算法性能优于现有的软判决算法,且比硬判决算法提升 1~3.5 dB。
关键词:本原 BCH 码;平均余弦符合度;软判决;最小错误判决准则;识别
中图分类号:TN911.7
文献标识码:A
doi:10.11959/j.issn.1000−436x.2020022
Blind recognition of primitive BCH code
based on average cosine conformity
WU Zhaojun
1
, ZHANG Limin
1
, ZHONG Zhaogen
2
, LONG Yufeng
3
1. The Institute of Information Fusion, Naval Aviation University, Yantai 264001, China
2. The School of Basis Aviation, Naval Aviation University, Yantai 264001, China
3. 310 Department, Naval Aviation University, Yantai 264001, China
Abstract: In order to overcome the poor performance of existing algorithms for recognition of BCH code in low sig-
nal-to-noise ratio (SNR), a recognition algorithm based on average cosine conformity was proposed. Firstly, by traversing
the possible values of code length and m-level primitive polynomial fields, the code length was identified by matching the
initial code roots. Secondly, on the premise of recognizing the code length, the GF(2
m
) domain was traversed under the
m-level primitive polynomial and the primitive polynomial with the strongest error-correcting ability was the generator pol-
ynomial for the domain. Finally, the minimum common multiple corresponding to the minimum polynomial of code roots
was obtained, and the BCH code generator polynomial was recognized. In checking matching, the statistic of average cosine
conformity was introduced. The optimal threshold was solved based on the minimum error decision criterion and distribution
of the statistic to realize the fast identification of the BCH. The simulation results show that the deduced statistical character-
istics are consistent with the actual situation, and the proposed algorithm can achieve reliable recognition under SNR of 5 dB
and code length of 511. Comparing with existing algorithms, the performance of the proposed algorithm is better than that of
the existing soft-decision algorithm and 1~3.5 dB better than that of the hard-decision algorithms.
Key words: primitive BCH code, average cosine conformity, soft decision, minimum error decision criterion, recognition
收稿日期:2019–08–22;修回日期:2019–12–05
通信作者:钟兆根,zhongzhaogen@163.com
基金项目:国家自然科学基金资助项目(No.91538201);泰山学者工程专项经费资助项目(No.ts201511020)
Foundation Items: The National Natural Science Foundation of China (No.91538201), Taishan Scholar Special Foundatio
(No.ts201511020)