Enhancing multiband OFDM performance: capacity-approaching codes and bit loading

TitleEnhancing multiband OFDM performance: capacity-approaching codes and bit loading
Publication TypeConference Paper
Year of Publication2005
AuthorsSnow, C., L. Lampe, and R. Schober
Conference NameUltra-Wideband, 2005. ICU 2005. 2005 IEEE International Conference on
Pagination6 pp.
Date Publishedsep.
Keywords480 Mbit/s, bit-loading algorithm, capacity-approaching codes, channel capacity, channel cutoff rate, frequency hop communication, frequency selectivity, frequency-hopping OFDM, high-rate wireless personal area networks, multiband OFDM performance, OFDM modulation, orthogonal frequency-division multiplexing system, personal area networks, repeat-accumulate codes, turbo codes, ultra wideband communication, ultra-wideband transmission

In this paper we consider turbo and repeat-accumulate (RA) codes as well as bit-loading as methods of enhancing the performance of multiband OFDM, a frequency-hopping orthogonal frequency-division multiplexing system which is a strong contender for the physical layer IEEE standard for high-rate wireless personal area networks (WPANs) based on ultra-wideband (UWB) transmission. Our methodology consists of (a) development and quantification of appropriate information-theoretic performance measures, and (b) comparison of these measures with simulation results for the multiband OFDM standard proposal as well as our proposed extensions. We find that the current multiband OFDM standard proposal sufficiently exploits the frequency selectivity of the UWB channel, and that the system performs in the vicinity of the channel cutoff rate. By applying turbo codes and a reduced-complexity clustered bit-loading algorithm the system power efficiency can be improved by over 6 dB at a data rate of 480 Mbps.


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