一种适用于流余通信系统的网格编码调制技术

Research on Trellis Coded Modulation Suitable for Meteor Trail Communication System

流星余迹通信信道具有短时突发传输的特点,为了在有限的传输时间内尽可能多的传输有用信息,达到提高传输速率及改善系统可通量的目的,提出了一种适用于流余通信系统的网格编码调制(TCM)技术;将8 PSK恒包络调制方式与TCM相结合以充分利用系统的发射功率;为了降低TCM算法的误码率,将传统TCM中的卷积编码替换为Turbo码,形成了TTCM-8PSK算法;通过选取性能优异的交织参数与码长进一步改善误码性能;在译码时对迭代的外部信息和分支转移概率进行加权处理,降低算法的复杂度;仿真结果表明:与常用的RS编码及BPSK/QPSK调制方式相比,TTCM-8PSK算法不仅使流余通信系统的可通量得到了提升,而且提高了传输可靠性,为下一代流余通信系统研制提供了理论基础。

Meteor trail communication has the characteristics of short-time burst transmission,In order to transmit as much useful information as possible in a limited transmission time,to improve the transmission rate and the system throughput,the Trellis Coded Modulation(TCM)technology suitable for meteor trail communication channel is proposed.Combine 8 PSK constant envelope modulation with TCM to make full use of the transmission power of the system;In order to reduce the bit error rate of TCM algorithm,TTCM-8 PSK algorithm is formed by replacing convolutional coding with turbo coding;The error rate performance is further improved by selecting the interleaving parameters and code length with excellent performance;In decoding,the external information of iteration and branch transition probability are weighted to reduce the complexity of the algorithm.The simulation results show that:Compared with the common RS coding and BPSK/QPSK modulation,the TTCM-8 PSK algorithm not only improves the throughput,but also improves the bit error performance.It can effectively improve the throughput of meteor trail communication system,and provide a theoretical basis for the development of the next generation meteor trail communication system.