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研究了一种用于大气激光通信自适应调制编码技术中的模式选择阈值的选取算法。分析了大气弱湍流信道性能,并对高斯信道中阈值选取算法进行修正,提出了一种信噪比-湍流强度选择方法来确定阈值区域模式,并给出了阈值选取方程。分析了湍流强度分别为0,0.1,0.2,0.3时3种传输模式下自适应调制编码系统的误码率,得到了最大误码率为10-4的条件下3种模式选择的信噪比与湍流强度阈值区域的对应关系。仿真结果表明,所提方法可行且能够准确地进行模式选择。
A selection algorithm of mode selection threshold for adaptive modulation and coding in atmospheric laser communication is studied. The weak turbulence channel performance is analyzed, and the threshold selection algorithm in Gaussian channel is modified. A signal to noise ratio - turbulence intensity selection method is proposed to determine the threshold region mode and the threshold selection equation is given. The error rates of adaptive modulation and coding systems under three transmission modes with turbulence intensities of 0, 0.1, 0.2 and 0.3 are respectively analyzed. The SNR of the three modes under the maximum error rate of 10-4 is obtained. And turbulence intensity threshold region correspondence. Simulation results show that the proposed method is feasible and can accurately select the mode.