卷积编码在低仰角Ka频段临近空间通信的计算机仿真性能分析

为提高低仰角情况下临近空间通信在不同天气下的误码率性能,提出在传输中采用卷积编码和维特比译码。首先讨论了临近空间信道传输特性,指出雨衰是影响Ka频段临近空间通信的最主要因素,并在此基础上建立了Ka频段临近空间信道模型。其次分析了卷积编码和维特比译码的特性,对其应用在临近空间通信的合理性进行了讨论。然后建立了临近空间通信的仿真模型,对基于卷积编码的Ka频段临近空间的通信性能进行了仿真。结果表明,利用卷积编码可以获得较高的编码增益,有效提高了临近空间通信在不同天气下的误码率性能。

Performance analysis of convolutional coding at low elevation Ka band near space communication

To improve the BER performance of the near space communications in the case of low elevation in different weather conditions, convolutional coding and Viterbi decoding in transmission is proposed. Firstly, the near space channel transmission characteristics are discussed, and rain attenuation is pointed out the most important factor to affect the Ka-band near space communications. Then a Ka-band near the spatial channel model is established on that basis. Secondly, the characteristics of the convolutional coding and Viterbi decoding are analyzed, and the rationality of its application in the near space communications is discussed. Then a simulation model of the near space communication is created, and near space communication performance of the Ka-band coding based on convolution is simulated. The results show that the use of convolutional coding can obtain a higher coding gain, effectively improve the BER performance of the near space communications in different weather conditions.