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利用基于多输入多输出算法的无约束频域均衡(FDE)对6×6模分复用(MDM)系统进行解复用,以消除模式耦合和差分模时延等损伤对信号的影响。分别用无约束频域最小均方(FD-LMS)算法和无约束频域恒模算法(FD-CMA)对MDM系统进行解复用,验证了无约束FDE的解复用效果;并将无约束FD-LMS算法及FD-CMA的均衡性能分别与有约束FD-LMS算法及FD-CMA进行对比。仿真结果显示,无约束FDE的解复用性能与有约束FDE相近,但其在计算复杂度方面优势明显。
The 6 × 6 MDM system is demultiplexed by Unconstrained Frequency Domain Equalization (FDE) based on multiple-input multiple-output (MIMO) to eliminate the influence of mode coupling and differential mode delay on the signal. The MDM system was demultiplexed by the Unconstrained FD-LMS algorithm and the Unconstrained FD-CMA, respectively, and the un-constrained FDE demultiplexing effect was verified. The constrained FD-LMS algorithm and the FD-CMA equalization performance are compared with the constrained FD-LMS algorithm and the FD-CMA respectively. The simulation results show that the performance of unrestricted FDE is similar to that of constrained FDE, but it has obvious advantages in computational complexity.