Title :
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
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;
Conference_Titel :
Mobile and Wireless Communications Network, 2002. 4th International Workshop on
Print_ISBN :
0-7803-7605-6
DOI :
10.1109/MWCN.2002.1045824
