Based on analysis of the characteristics of the satellite communication in high mobility environment, and aiming at frequent interruption and data loss of the communication link, the LDPC code with good error-detection and error-correction capability is proposed and applied in high-mobility environments, and its decoding algorithm is modified. In this modified algorithm, the initial channel likelihood information of the data-loss location in the received sequence is set at 0, and the iterative decoding algorithm is applied to solving the problem of channel noise interference and data loss, and at the same time, reducing the requirement of carrier synchronization. Simulation results indicate that the modified algorithm can effectively improve the reliability of satellite communication in high dynamic environments.%在分析高动态环境下卫星通信信道特点的基础上,针对通信链路易中断、数据易丢失的问题进行重点研究,提出将具有良好检错、纠错能力的LDPC码应用到高动态环境中,并对其译码算法进行改进.改进型算法中,将接收序列中数据丢失位置的信道初始似然信息置0,采用迭代译码方式,解决了信道噪声干扰和数据丢失问题,且降低了对载波同步的要求.仿真结果表明,改进型算法能够有效提高高动态环境下卫星通信的可靠性.
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