Based on the probability density function of the composite channel considering Malaga atmospheric turbulence, pointing error and atmospheric path loss, the asymptotic expressions of channel capacity and outage probability for binary phase shift keying (BPSK) modulation system are derived using Meijer G function. The numerical results show that under the same intensity of turbulence and path loss condition, the optimal performance of channel capacity and outage probability can be obtained by adjusting the jitter standard deviation and beam waist radius when the receiver radius is fixed. Meanwhile, the influence of weather conditions on channel capacity is greater than that of the beam waist radius and jitter standard deviation for the same turbulence distribution. It is illustrated that the optimal system performance can be obtained when \(w_{z} /a = 5\) and \(\sigma_{s} /a = 1.5\) in sunny weather. The channel capacity increases slowly at small signal-to-noise ratio under moderate–strong turbulence, and the stronger the fluctuation variance is, the greater the influence of fog on atmospheric communication.

基于考虑马拉加大气湍流、指向误差和大气路径损耗的复合信道概率密度函数，利用Meijer G函数推导出BPSK调制系统信道容量和中断概率的渐近表达式。数值结果表明，在相同的湍流强度和路径损耗条件下，在接收机半径固定的情况下，通过调整抖动标准偏差和束腰半径可以获得信道容量和中断概率的最优性能。同时，对于相同的湍流分布，天气条件对信道容量的影响大于波束腰半径和抖动标准差。说明当系统性能最优时\(w_{z} /a = 5\)和\(\sigma_{s} /a = 1.5\)在晴天。中强湍流下小信噪比信道容量增加缓慢，波动方差越大，雾对大气通信的影响越大。