太阳风湍流强闪烁信道下BPSK误码率闭式近似

由太阳风湍流引起的航天器对地链路上的信号强度波动会降低遥测性能，建立可靠的深空通信链路是至关重要的. 文章通过分析太阳风引起的遥测信号幅度闪烁特性，建立了遥测链路太阳风湍流强闪烁信道K分布模型；利用Laguerre正交多项式，完成信道K分布近似，并给出了太阳风湍流强闪烁信道下二进制相移键控(binary phase shift keying, BPSK)误码率闭式近似. 数值计算表明，闪烁指数对误码率影响很大，Laguerre多项式拟合参数β影响太阳风湍流强闪烁信道K分布近似和误码率，选择较小的值有利于降低K分布近似的KL散度和误码率；同时，选择更小的参数b，即β也更小，有利于降低遥测系统误码率.

Closed-form approximation of BPSK bit error rate over strong scintillation channel induced by solar wind turbulence

The signal strength fluctuations on the spacecraft-to-earth link caused by solar wind turbulence will reduce telemetry performance. It is essential to establish a reliable deep-space communication link. The K-distribution model of the solar wind turbulence and strong scintillation channel of the telemetry link is established by analyzing the characteristics of the telemetry signal amplitude scintillation caused by the solar wind. Using the Laguerre orthogonal polynomial, the channel K distribution is approximated and studied, and a closed-form approximation of the binary phase shift keying (BPSK) bit error rate under the strong scintillation channel of solar wind turbulence is given. Numerical calculations show that the scintillation index has tremendous influence on the bit error rate, and the parameter β affects the K-distribution approximation and bit error rate of the strong scintillation channel of the strong wind, and choosing a smaller value is beneficial to reduce the KL divergence and bit error rate of the K-distribution approximation. At the same time, choosing a smaller parameter b, that is a smaller β as well, is helpful to reduce the bit error rate of the telemetry system.