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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。
In this paper, a four-dimensional 8PSK trellis coded modulation system with 5/6 code rate and 3 constraint length is studied. The encoder, decoder and full digital synchronization algorithm are analyzed and studied. The results show that the four-dimensional 8PSK trellis coded modulation can effectively achieve the 45 ° phase rotation invariance by differential coding and differential decoding, and overcome the influence of multiple phase ambiguities of the reference carrier. All-digital synchronous receiving adopts digital filtering timing extraction algorithm and phase processing carrier recovery algorithm, and optimizes the timing deviation estimation value by Kaman filter, and realizes fast carrier tracking of the received signal.