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http://dx.doi.org/10.7840/kics.2013.38A.9.750

Retransmission Scheme with Equal Combined Power Allocation Using Decoding Method with Improved Convergence Speed in LDPC Coded OFDM Systems  

Jang, Min-Ho (울산과학대학교 전기전자공학부)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.38A, no.9, 2013 , pp. 750-758 More about this Journal
Abstract
In this paper, we introduce the low-density parity-check (LDPC) coded orthogonal frequency division multiplexing (OFDM) subframe reordering scheme for achieving equal combined power allocation in type I hybrid automatic repeat request (H-ARQ) systems and analyze the performance improvement by using the channel capacity. Also, it is confirmed that the layered decoding for subframe reordering scheme in H-ARQ systems gives faster convergence speed. It is verified from numerical analysis that a subframe reordering pattern having larger channel capacity shows better bit error rate (BER) performance. Therefore the subframe reordering pattern achieving equal combined power allocation for each subframe maximizes the channel capacity and outperforms other subframe reordering patterns. Also, it is shown that the subframe reordering scheme for achieving equal combined power allocation gives better performance than the conventional Chase combining scheme without increasing the decoding complexity.
Keywords
Convergence speed; Channel capacity; H-ARQ; LDPC codes; OFDM systems;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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