DocumentCode :
3242582
Title :
On the Enhancement of LDPC Codes in the IEEE 802.16 Physical Layer
Author :
ElMahgoub, Khaled ; Nafie, Mohammed
Author_Institution :
Univ. of Mississippi, Oxford
fYear :
2007
fDate :
24-28 June 2007
Firstpage :
683
Lastpage :
688
Abstract :
In this paper we study low density party check (LDPC) codes used in the IEEE 802.16 physical layer standard. We introduce two novel techniques to enhance the performance of such codes. In the first technique, we use the binary parity check matrix proposed in the IEEE 802.16 standard, and propose a novel parity check matrix for LDPC codes over GF(4) with the non-zero entries chosen to maximize the entropy. We show that our proposed code outperforms the binary code proposed in the IEEE 802.16 standard over both AWGN and SUI-3 channel model. In our second technique, we use a high rate LDPC code, in a concatenated coding structure, as an outer code, with a convolutional code as an inner code. We compare the performance of such a concatenated code with the commonly used one utilizing Reed-Solomon codes over the standard SUI-3 channel model, and show better performance.
Keywords :
WiMax; concatenated codes; convolutional codes; parity check codes; AWGN channel model; IEEE 802.16 physical layer standard; LDPC codes; Reed-Solomon codes; SUI-3 channel model; WiMAX; binary parity check matrix; concatenated code; convolutional code; low density party check codes; AWGN; Code standards; Concatenated codes; Convolutional codes; Iterative algorithms; Iterative decoding; Maximum likelihood decoding; Parity check codes; Physical layer; Reed-Solomon codes;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Communications, 2007. ICC '07. IEEE International Conference on
Conference_Location :
Glasgow
Print_ISBN :
1-4244-0353-7
Type :
conf
DOI :
10.1109/ICC.2007.117
Filename :
4288788
Link To Document :
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