Design of bit-interleaved turbo-coded modulation in OFDM-based wireless LAN systems

Author

Li, Yuan ; Sun, Sumei

Author_Institution

Inst. for Commun. Res., Singapore

fYear

2002

fDate

2002

Firstpage

549

Lastpage

553

Abstract

The design of bit-interleaved turbo-coded modulation (BITCM) in OFDM-based wireless LAN systems is studied. It is observed that for the frame size commonly used in wireless LAN applications, a larger constraint length in turbo codes does not necessarily introduce significant improvement in the BITCM performance in the signal-to-noise ratio range of interest, and it even leads to performance degradation in some cases. An explanation is provided from the viewpoint of weight distribution of turbo codes. Extensive performance evaluation indicates that BITCM with a constraint length of four has a good tradeoff between the performance and complexity for the OFDM-based wireless LAN system.

Keywords

AWGN channels; OFDM modulation; computational complexity; concatenated codes; convolutional codes; fading channels; interleaved codes; modulation coding; multipath channels; turbo codes; wireless LAN; AWGN channel; BITCM; ISI; OFDM-based wireless LAN systems; additive white Gaussian channel; bit-interleaved turbo-coded modulation; complexity; constraint length; frame size; inter-symbol interference; multipath fading; orthogonal frequency division multiplexing; parallel concatenated convolutional code; performance evaluation; quadrature amplitude modulation; signal-to-noise ratio; turbo codes; weight distribution; AWGN; Convolution; Convolutional codes; Fading; Local area networks; Modulation coding; OFDM; Quadrature amplitude modulation; Turbo codes; Wireless LAN;

fLanguage

English

Publisher

ieee

Conference_Titel

Mobile and Wireless Communications Network, 2002. 4th International Workshop on

Print_ISBN

0-7803-7605-6

Type

conf

DOI

10.1109/MWCN.2002.1045824

Filename

1045824