Investigation on Normalized Factor and Finite Word-Length for 802.11n LDPC Decoding

Author

Zhang, Shaohui ; Zhang, Yan ; Chen, Jinlei ; Zhang, Shuai ; Zhang, Mingrui

Author_Institution

Shenzhen Grad. Sch., Harbin Inst. of Technol. Univ., Shenzhen, China

fYear

2011

fDate

23-25 Sept. 2011

Firstpage

1

Lastpage

4

Abstract

in this paper, we theoretically derive the suitable normalized factor of normalized BP-based algorithm of LDPC decoding in 802.11n system. To be specific, we compute 1.15, 1.25, 1.3, 1.35 as the suitable normalized factors with regard to R=1/2, R=2/3, R=3/4, R=5/6 code in 802.11n system respectively. These factors can compensate for the performance loss in UMP BP-based algorithm. By analyzing the statistical distribution of variable node messages (R=1/2 code particularly), the word-length of variable nodes is reduced to 7 bits, and the simulation results show that it has a similar decoding performance compared with the theoretical 9-bit word-length decoding.

Keywords

decoding; parity check codes; roundoff errors; wireless LAN; IEEE 802.11n LDPC decoding; UMP BP-based algorithm; finite word-length; normalized BP-based algorithm; normalized belief-propagation-based algorithm; normalized factor investigation; performance loss; statistical distribution; variable node message; word length 7 bit; word length 9 bit; Complexity theory; Decoding; IEEE 802.11n Standard; Iterative decoding; Signal to noise ratio; Simulation;

fLanguage

English

Publisher

ieee

Conference_Titel

Wireless Communications, Networking and Mobile Computing (WiCOM), 2011 7th International Conference on

Conference_Location

Wuhan

ISSN

2161-9646

Print_ISBN

978-1-4244-6250-6

Type

conf

DOI

10.1109/wicom.2011.6036650

Filename

6036650