This paper discusses telecontrol communication coding for power systems in China and analyzes how to select the optimum generating polynomial and synchronization polynomial for shortened BCH codes.

本文讨论了我国电力系统远动通信中的编码问题，分析了如何选择缩短BC H码最优生成多项式和最佳同步多项式问题。

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The parameters include generator polynomial of component codes, interleave length and the type of interleavers, iterative decoding algorithms and iteration number, code rates and channel models et al.

这些参数主要包括分量码、交织长度和交织器类型、迭代译码算法和译码迭代次数、编码速率以及信道条件等。

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In the case of(Char(F_q), |G|)=1, we provide a method that writing down directly all the primitive idempotents of related polynomial ring, and hence that of all the minimum cyclic codes.

当有限域的特征不整除群的阶时，给出了直接写出相应的多项式环的本原幂等元的方法，从而可以直接写出所有的极小循环码。

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