一种基于时频变换域处理的M元扩频接收机

A M-ary Spread Spectrum Receiver Based on Time-Frequency Transform Domain

M元扩频技术已经应用于包括卫星通信系统在内的许多通信系统中,它的扩频解扩过程比较复杂,需要较多的正交扩频码和较高的计算复杂度。文中提出了一种M元扩频通信系统方案,用一条扩频码循环移位构成M个PN码,采用时频变换域匹配滤波器实现了解扩,不仅减少了需要的扩频码数目,而且有效地降低了接收机的计算复杂度。文中对所提出的系统性能进行了分析。

M- ary spread spectrum technique has been used in many communication systems, including the satellite communication system. Its spread and despread spectrum process is complex, and needs more orthogonal PN codes and more complicated computation. A new M- ary spread spectrum scheme is proposed in this paper. At the transmitter, M PN codes of each user are generated by circularly shifting the prototype spreading code. The proposed receiver can realize despreading with a time - frequency transform domain matched - filter, which reduces computation and PN codes selection difficulty of M - ary spread spectrum system. The performances of the proposed system are discussed and analyzed.