On the frame-error rate of concatenated turbo codes
On the frame-error rate of concatenated turbo codes
复制标题
关于级联turbo码的误帧率
DOI：
10.1109/26.917766
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发表时间：
2001
影响因子：
8.3
通讯作者：
D. Costello
中科院分区：
文献类型：
--
作者：
O. Takeshita;O. Collins;P. Massey;D. Costello
具有长帧长的Turbo码通常使用随机选择的交织器构造。从统计学上讲，这保证了出色的误码率（BER）性能，但也会产生一定数量的低权重码字，导致误码率曲线中出现错误层。为了改善误码率曲线的误差底区，提出了几种方法，包括使用外码。研究了外部BCH码对turbo码误码率的影响。我们证明了额外的编码增益是可能的，不仅在误差底区，而且在瀑布区。此外，外部代码通过提供停止准则和减轻收敛问题来改进迭代式APP解码器。用这种方法，我们得到了在10/sup -6/的频率下，性能在球填料界0.6 dB以内的码。
Turbo codes with long frame lengths are usually constructed using a randomly chosen interleaver. Statistically, this guarantees excellent bit-error rate (BER) performance but also generates a certain number of low weight codewords, resulting in the appearance of an error floor in the BER curve. Several methods, including using an outer code, have been proposed to improve the error floor region of the BER curve. We study the effect of an outer BCH code on the frame-error rate (FER) of turbo codes. We show that additional coding gain is possible not only in the error floor region but also in the waterfall region. Also, the outer code improves the iterative APP decoder by providing a stopping criterion and alleviating convergence problems. With this method, we obtain codes whose performance is within 0.6 dB of the sphere packing bound at an FER of 10/sup -6/.