基于多级门限判决的TDCS基函数生成及性能分析

针对变换域通信系统传统固定门限判决不能体现频谱的使用程度的问题,提出一种多级门限判决的基函数生成算法.分析了变换域通信系统( transform domain communication system,TDCS)电磁环境频谱的特性和窄带高斯信号的特征,建立了一种二元假设检验,在传统二元判决的基础上引入多元判决,能对电磁环境频谱进行多级量化,体现出不同频段的不同使用程度.仿真结果表明,采用多级门限判决的TDCS基函数误码率性能优于传统固定门限判决的TDCS基函数,抗干扰性能更好.

A basis function generation method of TDCS based on multi-threshold and its performance analysis

Concerning the lack of reflection of spectrum using level in traditional predefined threshold judgment of TDCS, a basis function generation method based on multilevel threshold judgment is proposed. The characteristics of spectrum in electromagnetic environment of TDCS and narrowband Gaussian noise are analyzed. And a binary hypothesis test, which is based on the introduction of multivariate judgment into the traditional binary method, is established so that the spectrum in electromagnetic environment can be quantized in multilevel to reflect the using levels of different bands. Simulation results show that this method has better performance on BER and anti-jamming compared with traditional predefined threshold judgment.