未知频偏下长码直扩信号的盲解扩  

Blind Despreading of Long-code DS-SS Signals with Unknown Carrier Offset

作　　者：牟青[1] 魏平[1] 

机构地区：[1]电子科技大学电子工程学院,成都610054

出　　处：《电子与信息学报》2010年第8期1797-1801,共5页Journal of Electronics & Information Technology

摘　　要：该文提出一种新的数据模型用于盲解扩含未知频偏的长码直扩信号。它将长码直扩信号重排为含有缺失数据的短码直扩信号,然后扩展使用了短码伪码周期的盲同步算法,最后采用交替投影算法恢复出信号子空间,并用于盲解扩。仿真实验表明提出的方法不受未知载频的影响,在低信噪比下表现了良好的性能。A novel signal model with missing-data is proposed to directly blindly despread the long-code Direct Sequence Spread Spectrum （DS-SS） signals with unknown carrier frequency.The long-code DS-SS signals are represented as the short-code ones with missing data,and then the blind synchronization algorithm of the short-code DS-SS signals is extended to the long-code ones.Finally,the Alternative Projection （AP） algorithm is used to restore the signal subspace so that blind despreading can be obtained.The simulation results show that the proposed approach is immune to the unknown carrier and show good performance in low-SNR scenarios.

关 键 词：信号处理 长码直扩信号 盲解扩 低秩缺失数据模型 交替投影算法 

分 类 号：TN911.7[电子电信—通信与信息系统]