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

摘要:

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8PSK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。

Abstract:

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 8PSK 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-8PSK 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-8PSK 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.