Simplified LLRs for the Decoding of Single Parity Check Turbo Product Codes Transmitted Using 16QAM | Zendy

Maher Arar | Zendy; Claude D’Amours | Zendy; Abbas Yongaçoğlu | Zendy

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Simplified LLRs for the Decoding of Single Parity Check Turbo Product Codes Transmitted Using 16QAM

Author(s) -

Maher Arar,

Claude D’Amours,

Abbas Yongaçoğlu

Publication year - 2007

Publication title -

research letters in communications

Language(s) - English

Resource type - Journals

eISSN - 1687-675X

pISSN - 1687-6741

DOI - 10.1155/2007/53517

Subject(s) - algorithm , computer science

Iterative soft-decision decoding algorithms require channel log-likelihood ratios (LLRs) which, when using 16QAM modulation, require intensive computations to be obtained. Therefore, we derive four simple approximate LLR expressions. When using the maximum a posteriori probability algorithm for decoding single parity check turbo product codes (SPC/TPCs), these LLRs can be simplified even further. We show through computer simulations that the bit-error-rate performance of (8,7)2 and (8,7)3 SPC/TPCs, transmitted using 16QAM and decoded using the maximum a posteriori algorithm with our simplified LLRs, is nearly identical to the one achieved by using the exact LLRs

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