基于快速沃尔什⁃哈达玛变换的OVSF码盲识别算法  

Blind Recognition Algorithm for OVSF Code Based on Fast Walsh⁃Hadamard Transform

作　　者：刘剑锋 郭晋宏 王光育 徐国微 冯华 LIU Jianfeng;GUO Jinhong;WANG Guangyu;XU Guowei;FENG Hua(92773 Troops,People’s Liberation Army of China,Wenzhou 325800,China;92512 Troops,People’s Liberation Army of China,Ningbo 315100,China)

机构地区：[1]中国人民解放军92773部队,温州325800 [2]中国人民解放军92512部队,宁波315100

出　　处：《数据采集与处理》2021年第1期184-198,共15页Journal of Data Acquisition and Processing

摘　　要：在深入研究可变长扩频因子(Orthogonal variable spreading factor,OVSF)码递归构造原理、码树结构模型、数学理论基础以及分配原则的基础上,针对宽带码分多址(Wideband code division multiple access,WCDMA)信号非合作接收情况,提出了一种基于快速沃尔什⁃哈达玛变换的OVSF码盲识别算法。该算法利用OVSF码的继承关系、正交特性以及数据的循环移位,并结合快速沃尔什⁃哈达玛变换,消除了数据解扩模糊性,降低了计算复杂度。理论分析和实验结果表明:本文算法在非合作和无先验信息以及低信噪比情况下,可对WCDMA系统下行信道中的多个OVSF码进行快速解扩与盲识别,具有很好的可靠性、有效性和实用性。实测中,本文算法8.2 ms可完成3帧数据内20个OVSF扩频码的同时识别,识别准确率在95%以上,具有很高的工程应用价值。Based on the in-depth study of the recursive construction principle,code tree structure model,mathematical theory foundation and distribution principle of orthogonal variable spreading factor(OVSF)code,a blind recognition algorithm based on fast walsh-hadamard transform for non-cooperative reception of wideband code division multiple access(WCDMA)signals is proposed.By using the inheritance relation and orthogonal property of OVSF code as well as the cyclic shift of data,and combining with the fast walsh-hadamard transform,the proposed algorithm eliminates the ambiguity of de-spreaded data and reduces the computational complexity.Theoretical analysis and experimental results show that the proposed algorithm can perform rapid de-spread and blind recognition of multiple OVSF codes in the downlink channel of the WCDMA system under the conditions of non-cooperation,no prior information and low signal-to-noise ratio,which is very reliable,effective and practical.In the actual measurement,this algorithm costs 8.2 ms to complete the recognition of at least 20 OVSF codes in three frames of data simultaneously,and the recognition accuracy is more than 95%,which has high engineering application value.

关 键 词：可变长扩频因子码 快速沃尔什⁃哈达玛变换 盲识别 非合作 宽带码分多址 

分 类 号：TN911.7[电子电信—通信与信息系统]