波形对重叠时分复用符号差错率的影响

Influence of waveforms on ber performance of overlapping time division multiplexing

为了深入研究重叠时分复用系统,通过已有的理论界推导了影响系统符号差错概率的关键因素,由此解析地研究了指数波形、高斯波形和矩形波形对重叠时分复用符号差错概率的性能影响。在加性白高斯噪声信道和瑞利信道的仿真分别验证了这种分析。结果表明:无论是在加性白高斯噪声信道还是在瑞利信道,重叠时分复用系统的符号差错率随着波形参数的增加而单调减小。因此采用截断指数波形和高斯波形的重叠时分复用系统比采用矩形波形的重叠时分复用系统更灵活,性能更好。

To study the concept of Overlapping Time Division Multplexing （OvTDM）, the implemented waveform is proved analytically to be the one that determines the symbol error ratio （SER） of the system based on the existing upper bound. Furthermore, the influence law is invesitigated by the use of exponential waveform, Gaussian waveform and rectangular waveform. OvTDM systems with the above three waveforms were simulated in the case of White Gaussian Noise （AWGN） channel and Rayleigh channel, respectively. Simulation results show that the bit error ratio （BER） performance of the OvTDM system becomes better monotonically with the waveform parameter;s increase. Thus, the OvTDM system employing exponential waveform or Gaussian waveform is more flexible than the one with rectangular waveform, and the performance is much better.