四维8PSK网格编码调制及全数字化同步算法的研究

Research of Four-Dimension 8PSK Trellis-Coded Modulation and an All Digital Synchronous Algorithm

本文研究了一种码率为5/6,约束长度为3的四维8PSK网格编码调制系统,对编码器、译码器及全数字化同步算法进行了分析和研究。结果表明,通过差分编码和差分译码,四维8PSK网格编码调制能够有效地实现45°相位旋转不变性,克服参考载波多重相位含糊度的影响。全数字化同步接收采用数字滤波定时提取算法和相位处理载波恢复算法,通过卡曼滤波对定时偏差估计值进行优化,并实现对接收信号的快速载波跟踪。

A Four-Dimension 8PSK Trellis-Coded Modulation (TCM) of coding rate R = 5/6, constraint length v= 3 is studied in this paper, together with an all digital synchronous algorithm. The result shows that 45° rotationally invariancc can be easily reached by differential coding and decoding, and can overcome the impairment of multiple phase ambiguities of reference carrier. Digital filtering timing extraction algorithm and phase processing carrier recovery algorithm are used in the all digital synchronous receiving. The timing estimation can be optimized through Kalman filtering, and fast acquisition of carrier phase can be obtained from the receiving signals.