TDCS伪随机相位生成法及其改进

摘要

针对变换域通信系统中利用传统伪随机相位生成法所得的基函数随机性较弱且相关性较差的问题,提出了一种采用混沌映射m序列控制的伪随机相位生成法,相比于传统相同长度一维m序列产生的基函数,所产生的基函数随机性提高了N倍(N为m序列的长度);同时又由于采用混沌映射,产生的基函数互相关系数很小且可选数量很大.仿真结果表明,采用混沌映射m序列控制法生成的基函数,其随机性与相关性同时得到了提高,从而有效地降低了TDCS的误码率.%Based on the requirements of the pseudorandom phase vector in transform domain communication system(TDCS),a new method was proposed in the paper,which uses chaos mapping and m-sequences control to generate the pseudorandom phases of the basis function in TDCS.The implementation method and the simulation results regarding the correlation performance for the basis function were discussed in detail.Compared with that of the parallel,the basis function's randomicity of the new method is N times by that of one-ary method(the length of m-sequence is N),and the basis functions have better correlation performance for that many basis functions with small cross-correlation coefficients can be generated by chaos mapping.The simulation results show that the correlation performance of the basis function produced by the new method is improved and the performance on BER is better.