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给出用特征标构造群码的方法。
Gives a method to construct the group codes by using the character tables.
构造了此类群码的自然状态实现的格子图和它的通过其格子图的途径；
The trellis diagram of the natural state realization of the group code and the path through the trellis diagram of the group code are constructed.
从精确成对错误概率(PEP)出发，推导得到了DUST调制群码符号误码率(sep)的联合边界。
Starting from the precise pair-wise error probability (PEP), the joint border of group coding signal error probability (SEP) in differential unitary space-time (DUST) modulation is deduced.
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