基于Kirkman三元系的RA码交织器设计

摘要

重复累积(RA)码的随机交织器容易产生短环问题,增加了系统的误码率.通过平衡不完全区组设计中的Kirkman三元系设计,构造了KTS - RA码交织器.Kirkman三元系相遇数为1的特点使交织器中没有4环存在.RA码码率由所选平行类的个数确定,而Kirkman三元系含有较大的平行类数,因此码率可在较大范围内选择.仿真结果显示,KTS- RA码性能优于随机RA码.%Repeal -accumulate(RA)code based on random interleavers easily produces short cycles which increase bit errors of decoder. In this paper, interleaver of RA codes is constructed based on Kirkman triple system( KTS)design,which belongs to balanced incomplete block design. As covalen-cy A of KTS is 1, the interleaver is free of 4 cycles. KTS-RA codes rate can be adjusted flexible through different number of parallel classes. As the number of parallel classes is large,KTS-1RA codes have a wide range of code rates. Simulation results show that performance of KTS-RA codes gain advantage over traditional RA codes.