基于循环映射算法的并行组合扩频通信

Parallel combinatory spread spectrum communication system with cyclic mapping algorithm

并行组合扩频通信比普通的直扩通信和软扩频通信具有更高的信息传输效率。在接收过程中,如果选出的r个最大扩频序列中有一个序列出错,就会造成大量误码。现有的数据-序列映射算法都没有判断和纠错序列出错的能力。提出了基于循环映射的新数据-序列映射算法,通过对选取扩频序列增加强约束关系,使新数据-序列映射算法具有判断和纠正一个序列出错的能力,大大降低系统误码率。理论分析和仿真结果表明,在同等信噪比下,循环映射数据-序列映射算法能使误码率降低2个量级等级,大大提高并行组合扩频通信的可靠性。

The parallel combinatory spread spectrum（PC/SS）communication system is designed to have higher date transmission capability than ordinary and soft spread spectrum（SS）communication systems.The PC/SS system must ensure all r selected pseudo-noise（PN）sequences decision correct when receiving,otherwise a string of errors will be received.Existing data-sequence mapping algorithms do not have the ability of judgment and error correction.For this problem,the cyclic mapping algorithm is proposed,and the proposed algorithm can effectively reduce the error probability of sequence decision through adding strong cyclic constraint relation in selected rsequences.Theoretical analysis and simulation results show that the error rate performance of the cyclic mapping algorithm 2orders of magnitude lower than the conventional mapping algorithm under the same conditions,and the reliability of the PC/SS system is improved dramatically.