基于软信息的扰码盲识别方法  

Scrambler blind recognition method based on soft information

作　　者：陈泽亮 彭华[1] 巩克现[1] 于沛东[1] 

机构地区：[1]解放军信息工程大学信息系统工程学院,河南郑州450001

出　　处：《通信学报》2017年第3期174-182,共9页Journal on Communications

基　　金：国家自然科学基金资助项目(No.61401511)~~

摘　　要：针对非合作接收的加扰信号,提出2种基于软信息的扰码盲识别方法。方法 1利用软信息建立了扰码系数的代价函数,采用实数域的优化理论进行正向求解,不再需要对多项式测试闭集进行遍历;方法 2利用软信息建立了符合度的概念,以每个测试扰码多项式符合度的大小作为判别的标准,相比硬判决识别算法,其对接收信息得到了更充分的利用。仿真结果表明,方法 1相比Cluzeau提出的遍历方法,其自同步扰码多项式的识别时间可从5 min 18s缩短为8s;方法 2与现有硬判决算法相比,达到较高正确率时,具有约2 dB的信噪比增益。Two scrambler blind recognition methods based on soft information were proposed for received signal in non-cooperative ways.The first method established a cost function of the scrambler coefficients by using the soft information,and adopted the optimization theory of real number field for positive solution.So it didn＇t need to traverse the closed set of test polynomial any more.The second method built conformity degree concept with the soft information,and used the size of conformity of each test scrambler polynomial as the discriminant criteria.So it made more full use of the received information compared to the hard sentence recognition algorithm.Simulation results show that the first method can shorten the recognition time of a synchronous scrambler polynomial from 5 min 18s to 8s compared with the traversal method put forward by Cluzeau,and the second method has 2 dB SNR gain when to achieve the relatively high accuracy compared with the hard sentence recognition algorithm.

关 键 词：软信息 扰码盲识别 代价函数 符合度 抗噪性能 

分 类 号：TN911.7[电子电信—通信与信息系统]