DocumentCode :
3137556
Title :
Reliability-based hybrid ARQ and rate-compatible punctured convolutional (RCPC) codes
Author :
Roongta, Abhinav ; Shea, John M.
Author_Institution :
Dept. of Electr. & Comput. Eng., Florida Univ., Gainesville, FL, USA
Volume :
4
fYear :
2004
fDate :
21-25 March 2004
Firstpage :
2105
Abstract :
Reliability-based hybrid ARQ (RB-HARQ) is a recently developed form of incremental-redundancy ARQ. The RB-HARQ technique can be used with codes that use soft-input, soft-output (SISO) decoders, such as convolutional codes and turbo codes. In RB-HARQ, the bits that are to be retransmitted are adaptively selected at the receiver based on the estimated bit reliabilities at the output of a SISO decoder. This technique has the potential to improve performance and minimize retransmission size by targeting those bits that are likely to be in error. It has already been shown that RB-HARQ achieves significant performance improvement provided that large retransmission-request (NACK) packets can be afforded on the feedback link. In this paper, we propose and evaluate the performance of a RB-HARQ technique that uses rate-compatible punctured convolutional (RCPC) codes in the forward channel and source coding in the feedback link. The proposed technique uses source coding to achieve small request packets, thus leading to better performance. The performance of the proposed technique is evaluated in terms of probability of bit error, probability of packet error and throughput. We also compare the performance of the proposed scheme with the common approach to hybrid-ARQ that uses punctured convolutional codes and code combining. The results show that the proposed RB-HARQ scheme achieves better performance than a hybrid-ARQ scheme that uses only RCPC codes.
Keywords :
automatic repeat request; combined source-channel coding; convolutional codes; error statistics; packet switching; redundancy; reliability; bit reliability estimation; bit-packet error probability; code combining; feedback link; forward channel-source coding; incremental-redundancy ARQ; large retransmission-request packet; rate-compatible punctured convolutional code; reliability-based hybrid ARQ; soft-input soft-output decoder; Automatic repeat request; Computer network reliability; Convolutional codes; Decoding; Feedback; Source coding; Throughput; Turbo codes;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Wireless Communications and Networking Conference, 2004. WCNC. 2004 IEEE
ISSN :
1525-3511
Print_ISBN :
0-7803-8344-3
Type :
conf
DOI :
10.1109/WCNC.2004.1311412
Filename :
1311412
Link To Document :
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