WCDMA前导扰码的因子图迭代检测算法  

Iterative Detection for the WCDMA Preamble Scrambling Code on Factor Graphs

作　　者：胡红博 孙正波 党同心[1] 杨宇翔 邓兵 HU Hongbo;SUN Zhengbo;DANG Tongxin;YANG Yuxiang;DENG Bing(Information Engineering University, Zhengzhou 450001, China;Science and Technology on Blind Signal Processing Laboratory, Chengdu 610041, China)

机构地区：[1]信息工程大学,河南郑州450001 [2]盲信号处理重点实验室,四川成都610041

出　　处：《信息工程大学学报》2020年第4期403-409,共7页Journal of Information Engineering University

摘　　要：WCDMA技术是通信中的一种重要多址机制,实现其前导扰码的检测是上行信号盲检测的基础。根据因子图迭代检测的思想,选择分层校验迭代模型并分析不同校验关系对其检测性能的影响,改进迭代估计序列的选取方法。不同参数的校验关系在信噪比不同时检测性能曲线区别较大,合理组合校验关系可以提升扰码迭代检测性能;选择误码最小的一次迭代估计序列作为算法最终检测结果。仿真实验表明,选择度数较少、级数较大的校验关系并合理组合可以提高分层校验的迭代检测性能,恢复扰码初态的方法有助于选择误码最小的估计序列。WCDMA(Wideband Code Division Multiple Access)has become a multiple access mechanism in communications,and the detection of its preamble scrambling code is the basis of the uplink blind detection.According to the iterative idea of factor graphs,the layer check iterative model is selected and the effect of its different calibration relationship is analyzed.And the selection method of the estimation sequence is improved.The detection performance curve for different parameter check relationship is quite different when the signal-to-noise is different.The reasonable combination relationship can improve the detective performance.It selects the smallest iteration estimate sequence as final detection result of the algorithm.Simulation shows that the iterative detection performance is improved on a reasonable combination of selected relationship with few degrees and large series.And the method of recovering the initial state of the scrambling code helps to select the estimated sequence with the smallest bit error.

关 键 词：WCDMA 前导扰码 因子图 迭代检测 

分 类 号：TN911.7[电子电信—通信与信息系统] TN927+.23[电子电信—信息与通信工程]