基于快速沃尔什-哈达码变换的WCDMA卫星信号检测算法

WCDMA(wideband code division multiple access)是LEO(low earth orbit)卫星中的一种多址机制,WCDMA卫星信号的同步检测是该信号正确解析的基础。在已知扰码的情况下,使用导频信道进行相关检测能够提高无线帧同步的准确性。在已有的相关检测的基础上,根据FFT(fast fourier transform)快速相关的思路,给出了一种基于FWHT(fast walsh-hadamard transform)的WCDMA卫星信号快速检测的算法。该方法减小了相关检测的计算量,从而降低了算法复杂度。仿真结果显示,该算法很好的提高了相关检测算法的效率。算法具有高效性和可行性,能够满足WCDMA卫星信号快速检测的需求。

A WCDMA Satellite Signal Detection Algorithm Based on Fast Walsh-Hadamard Transform

WCDMA is a multi-access mode of LEO satellites. The synchronous detection of WCDMA satellite signal is the basic part of the signal analysis. In situations where primary scrambling code has been known, the accuracy of detection can be enhanced by use of pilot channel to implement correlated detection. According to the existing methods of correlated detection, as well as the procedures of FFT fast correlation, the present study presents a fast algorithm of WCDMA satellite signal detection based on FWHT. Theoretical analysis shows that the algorithm reduces the computation of correlated detection, which reduces the timing complexity. The simulation results show that the proposed scheme improves the performance of correlated detection. The algorithm has the high efficiency and feasibility, which can meet the requirement of the correlated detection in WCDMA satellite signal.