基于对消解调的时相调制误码率分析

Analysis of Bit Error Rate of Time-phase Modulation Based on Demodulation after Cancellation

以二进制为例,从对消解调的角度,导出了时相调制(TPM)信号在加性白高斯噪声信道下的误码率解析表达式。可以发现:TPM信号误码率与码元突变后的波形持续时间成反比,即相同信噪比条件下持续时间越长则误码率越小。通过对比判决统计量,可以发现对消解调是相关解调的简洁实现方式。仿真结果验证了上述理论推导。其结论可为进一步分析时相调制的其他解调方法性能提供参照和依据。

The analytic expression of bit error rate（BER） is derived following the route of demodulation after cancellation when binary modulation is accepted in the channel of Gauss white noise. It can be found that the BER of time - phase modulation（TPM） is inversely proportional to the code duration after phase jump, that is to say, the longer the duration is, the smaller the BER on condition that the same signal - to - noise ratio（SNR） is kept. Through the comparison of decision variable, it can be found that demodulation after cancellation is the concise version of correlation demodulation. The simulations verify the theoretical derivation, which can provide the reference and basis for further analysis of other demodulation performance of time-phase modulation.