一种准正交混合扩频通信算法

Algorithm for quasi-orthogonal hybrid spread-spectrum communication

针对无线扩频通信频带利用率有限的问题,提出了一种准正交混合扩频通信算法及其实现方案.该算法利用扩频码码极性特点在同相支路上进行BPSK调制的直接序列扩频传输,利用扩频码码相位特点在正交支路进行M元扩频传输.系统通过同相支路扩频码提取扩频码起始位置,继而利用两支路扩频码互补特点获取载波信息.系统实现不需要额外提供同步信息,系统的扩频码码集仅由一条扩频码在限定相位区条件下通过循环移位构成.仿真结果表明该算法可有效地提高系统资源的利用率.

A new quasi-orthogonal hybrid spread spectrum communication algorithm and its realized scheme are proposed. The algorithm can achieve BPSK DSSS in the in-phase branch based on the code phase, and the M-ary modulation in the orthogonal branch based on code polority. The system can achieve the starting position of the spread spectrum utilizing the spread spectrum（SS） code in the inphase branch, and get carrier message with the complementary character of spread spectrum codes in two channels, and it needs no external source of synchronization. The code set of SS codes comes from one SS code by cyclic shifting with the limit of phase area, which is easy to realize. The simulation results demonstrate that the algorithm is effective in improving the utilization ratio of system resources.