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为了降低非线性信道对正交幅度调制(QAM)信号的频谱和误码性能的影响,根据消除连续星座点间180°相位跳变可以降低信号功率峰均比的原理,提出了一种新的π/2相移非正方形M-QAM调制方式,以及一种简化的调制端实现方法。仿真结果表明,和常用的非正方形M-QAM调制方式相比,对于信道非线性引起的高阶频率扩散,该文提出的方法有5 dB的改善;在不同的非线性强度下,误码性能也有不同程度的改善,在平均误码率(BER)为10-3时,改善均大于1dB,而且随着信道信噪比的提高,改善更为明显。
In order to reduce the influence of nonlinear channel on the spectrum and error performance of Quadrature Amplitude Modulation (QAM) signals, according to the principle of eliminating the peak-to-average ratio of signal power by eliminating 180 ° phase transitions between consecutive constellation points, a new π / 2 phase shift non-square M-QAM modulation, and a simplified modulation end implementation. The simulation results show that compared with the conventional non-square M-QAM modulation scheme, the proposed method has a 5 dB improvement for high-order frequency dispersion caused by channel non-linearity. Under different nonlinearities, the error performance But also improved to some extent. When the average bit error rate (BER) is 10-3, the improvement is more than 1dB, and the improvement is more obvious as the channel SNR increases.