数字卫星信道非线性性能分析和仿真

Performance Analysis and Simulation of Nonlinear Digital Satellite Channels

数字卫星信道非线性的性能预测和分析通常都是依靠纯粹的数学分析或Monte -Carlo仿真来实现的。它们或是只适用于较为简单的信道模型 ,或是非常耗费时间。通过分析数字卫星信道的非线性 ,给出了在信道中因TWT非线性引起的信号畸变进行相位补偿的一种方法 ,用较小的投入在计算机工作站上实现了卫星信道非线性性能预测和仿真。仿真结果表明 ,TWT是引起信道非线性的主要因素 ,对TWT的非线性进行相位补偿能够较好地改善信道误码性。

Performance prediction and analysis of nonlinear digital satellite channels are usually obtained by either purely mathematical analysis or Monte-Carlo simulation. These approaches must work with very simple channels or become extremely time consuning. In this paper, through analyzing the effect of nonlinearity of digital satellite channels, a way of phase compensation against the signal distortion mainly caused by TWT is presented, so that it is possible to obtain approximate performance prediction and simulation with a minimum of computer time and cost. The simulation results demonstrate that the nonlinearity of TWT is the main part of channel nonlinearity, thus to compensate the phase distortion of TWT can improve the channels' nonlinear performance.