The design and performance analysis of the M-ary spread spectrum system based on the quasi-orthogonal multi-PN code
Kechu Yi · Journal of Xidian University · 2010
We propose a novel class of M-ary spread spectrum based on the quasi-Orthogonal multi-PN code.A hybrid matrix based on the Golay complementary sequence is deduced and used for the M-ary spread spectrum,which greatly enhances the band efficiency and robustness,and compared with the spread spectrum technique,it provides a larger spread gain and a stonger anti-intercept capture capability.In order to overcome the difficulties incurred by a long PN code spread spectrum system such as high computational complexity of synchronization and complicated hardware realization,a novel fast acquisition algorithm based on the 2-stage FFT is presented whose complexity is largely reduced compared with the conventional PMF-FFT algorithm.The receiver can effectively eliminate distortion caused by phase offset of the carrier using quadrature subchannel information for intersect data dispreading.