深空通信中的一种级联编码调制的性能研究

摘要

With the tasks of deep space detection being much more sophisticated, there are higher requirements for mass information transmission and fast processing capability of data in deep space communication. In order to enhance the frequency bandwidth utilizing ratio of the deep space communication system while ensuring the higher power and efficiency of the system, this paper proposes coding modulation system with Feher-patented quadrature phase-shift-keying (FQPSK) being cascaded to the Fountain code, and analyzes the system performance on the coding modulation by simulation. Simulation results show that the bandwidth utilizing ratio of the system can be boosted greatly by means of the higher bandwidth efficiency of FQPSK modulation, the communication with lower SNR realized by using the fountain codes, which guarantees a constant bit error rate under the various channel environment by adjusting the decoding expenses, thus being able to relieve the power-limited and bandwidth shortage emerging in the development of deep space communication.%　　为保证深空通信系统高功率效率的同时，提高通信系统的频带利用率，提出了基于Feher专利的四相相移键控(FQPSK)和喷泉码的级联编码调制体制，并对该编码调制体制性能进行了仿真分析。仿真结果表明，该体制利用FQPSK调制的高带宽效率使系统的频带利用率有很大程度的提高；利用喷泉码实现低信噪比通信，可以通过调整译码开销保证不同信道环境下的恒定误码率，从而能够缓解发展中的深空通信中将会遇到的功率受限和频带紧张问题。