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航空学报  2013 

基于恒模特性的QPSK-DSSS信号扩频序列估计

DOI: 10.7527/S1000-6893.2013.0126, PP. 1389-1396

Keywords: QPSK-DSSS信号,扩频序列,信号子空间,恒模特性,酉阵模糊

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Abstract:

针对非合作低信噪比条件下的QPSK-DSSS信号,提出一种基于恒模特性的扩频序列估计算法。该算法首先将单用户QPSK-DSSS信号等效为两用户的BPSK-DSSS信号,其次通过对信号协方差矩阵进行特征分解,估计出由同相与正交两路扩频序列张成的二维信号子空间,最后利用扩频序列的恒模特性消除特征分解带来的酉阵模糊问题,实现扩频序列的精确估计。本文提出算法实现简单,相对目前现有传统算法具有较低的计算复杂度,而且计算机仿真表明本文提出算法在低信噪比条件下具有优良的估计性能。

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