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特高频(UHF)频段由于其良好的通信性能,正愈发广泛地应用于军事卫星通信,尤其是卫星移动通信,然而由于该频段信道所受干扰和固有衰落的限制,UHF在卫星通信中的应用并非一帆风顺。如何提高系统通信容量及在干扰环境下的信道可用率是目前UHF频段军事卫星通信发展所面临的主要挑战。文章在分析UHF频段卫星通信特点的基础上,简要介绍了具有良好性能的低密度校验码(LDPC)码和连续相位调制(CPM)方式,并结合UHF频段的卫星信道特点,提出了一种新的发展对策——LDPC+CPM+FH的串行级联通信方案,最后对方案进行了建模和计算机仿真。
Due to its good communication performance, the UHF band is being used more and more widely in military satellite communications, especially in satellite mobile communications. However, due to the interference and inherent fading of the channel in this band, UHF is used in satellite communications The application is not easy. How to improve the system communication capacity and channel availability in the interference environment is the main challenge for the development of military satellite communications in the UHF band at present. Based on the analysis of the characteristics of satellite communication in UHF band, this paper briefly introduces the low performance parity check code (LDPC) code and continuous phase modulation (CPM) method with good performance. Combining the characteristics of satellite channel in UHF band, New development countermeasures - LDPC + CPM + FH serial cascade communications program, and finally the program modeling and computer simulation.