Pseudo-ARQ for a Low Density Parity Check Code Decoder

Author

Alleyne, Damien ; Sodha, Janak

Author_Institution

Univ. of the West Indies, Bridgetown

fYear

2007

fDate

8-10 Oct. 2007

Firstpage

19

Lastpage

19

Abstract

A pseudo automatic repeat request scheme for a LDPC decoder is presented which dramatically improves the probability of an error in an information binary digit over the signal-to-noise ratio (SNR) range 0 dB to 2 dB, by sacrificing the information throughput, with the added advantage of not being adversely affected by a fluctuation in the channel SNR. A frame, which consists of the concatenation of several code words, is retransmitted only if the channel signal- to-noise ratio estimate is found to be lower than a set threshold. Overall, the throughput is only briefly reduced as required to ensure excellent performance over low and high SNRs. Simulation results are presented for rate 1/2 (288, 576) WiMAX 802.16e LDPC code over an A WON channel with binary phase shift keying (BPSK) modulation.

Keywords

AWGN channels; WiMax; automatic repeat request; decoding; error statistics; parity check codes; phase shift keying; AWGN channel; BPSK; LDPC decoder; SNR; WiMAX 802.16e; binary phase shift keying modulation; channel signal- to-noise ratio estimate; error probability; low density parity check code decoder; pseudo-ARQ; Automatic repeat request; Binary phase shift keying; Decoding; Fluctuations; Modulation coding; Parity check codes; Phase modulation; Signal to noise ratio; Throughput; WiMAX;

fLanguage

English

Publisher

ieee

Conference_Titel

Wireless and Mobile Computing, Networking and Communications, 2007. WiMOB 2007. Third IEEE International Conference on

Conference_Location

White Plains, NY

Print_ISBN

978-0-7695-2889-2

Type

conf

DOI

10.1109/WIMOB.2007.4390813

Filename

4390813