Bit-Level Hybrid-ARQ Schemes with Turbo Codes

Dong Ho KIM  Hwang-Soo LEE  

IEICE TRANSACTIONS on Communications   Vol.E87-B   No.11   pp.3370-3373
Publication Date: 2004/11/01
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technologies
hybrid-ARQ,  bit level,  turbo codes,  

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With iterative turbo decoding, the reliability of each bit in a frame is not same after some iterations. We propose novel bit-level hybrid automatic repeat request (HARQ) schemes with turbo codes in which only the unreliable bit and its neighboring bits are retransmitted based on the decoding reliability. The proposed bit-level HARQ schemes improve error performance compared with conventional HARQ schemes.