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针对传统技术不能实现自适应调制光纤激光通信采样速率与码元速率,造成频谱混叠,频域均衡性能差的难题,提出改进的光纤激光通信中频域均衡技术。首先构建光纤激光通信的信道模型,进行光纤激光信道的时频分析和调制解调处理,然后对信道传输的光纤激光通信信号进行干扰抑制,采用波特间隔抽样判决方法实现码间干扰的盲分离,采用混叠频谱抑制方法降低信道传输中的频域失真概率,实现通信频域均衡优化,最后通过仿真实验进行性能测试,结果表明,本文技术能提高激光通信的输出频域特征响应,降低通信的误比特率,可以显著提高光纤激光通信稳定性和准确性。
Aiming at the problem that the traditional technology can not adaptively modulate the sampling rate and the symbol rate of the modulated fiber laser communication, resulting in the aliasing of the spectrum and the poor performance of equalization in the frequency domain, an improved frequency domain equalization technique for fiber laser communication is proposed. Firstly, the channel model of fiber laser communication is constructed, and the time-frequency analysis and modulation and demodulation of fiber laser channel are carried out. Then the interference of fiber laser communication signal transmitted by channel is suppressed, and the blind separation of inter-symbol interference , The aliasing spectrum suppression method is used to reduce the frequency domain distortion probability in the channel transmission to achieve the optimization of the communication frequency domain. Finally, the performance test is carried out through simulation experiments. The results show that the proposed technique can improve the output frequency response of the laser communication and reduce the communication Bit error rate, can significantly improve the stability and accuracy of fiber laser communications.