Abstract
Performances of BICM-ID systems strongly depend on the matching between mapping rule and code structure. This paper proposes a combined use of extended mapping (EM) and simple repetition code. Even with such a simple structure, turbo cliff happens at a value range of signal-to-noise power ratio (SNR) 1~2 dB to the Shannon limit. This paper then introduces check node as well as irregular node degree allocation to the proposed structure described above, so that we can flexibly change the shape of the decoder EXIT curve. It is shown that EXIT analysis and chain simulation results exactly match each other.
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