卫星信道基带残留误码分布特性拟合与模拟

卫星通信信道的基带残留误码特性直接影响上层通信协议的性能。通过对卫星通信系统仿真，提取基带误码图案，将基带误码分布图案通过误码持续期发生概率密度分布、误码持续期长度概率密度分布来表征。在典型的卫星通信系统参数条件下，拟合表明经过有噪莱斯衰落信道的误码持续期发生概率接近广义极值分布；经过高斯噪声信道的误码持续期发生概率密度、误码持续期长度概率密度接近负二项式分布。在此基础上完成的卫星基带信道硬件模拟器能够为通信协议的测试提供方便、可信的信道基带特性模拟。

Fitting Distribution and Emulation of Residuary Bit Errors in Satellite Baseband Channels

The characteristic of residuary bit errors in satellite baseband channel affects the performance of communication protocol in upper layers significantly. By system simulation and analyzing the bit error patterns, the probability distribution function (PDF) of bit errors occurrence and PDF of bit errors length are obtained. In typical satellite communication systems against the Rician fading channel, the PDF of bit errors occurrence approximates generalized extreme value distribution. But in Gaussian noise channel, the PDFs of bit errors occurrence and bit errors length approximate negative binomial distributions. Base on these fitting distributions, the baseband channel emulator provides a convenient method for system testing, which imposes residuary bit errors pattern on data stream reasonably.