Performance Analysis and Enhancement of Multiband OFDM for UWB Communications

TitlePerformance Analysis and Enhancement of Multiband OFDM for UWB Communications
Publication TypeJournal Article
Year of Publication2007
AuthorsSnow, C., L. Lampe, and R. Schober
JournalWireless Communications, IEEE Transactions on
Pagination2182 -2192
Date Publishedjun.
Keywordsbit rate 480 Mbit/s, channel estimation, frequency-hopping orthogonal frequency-division multiplexing system, IEEE 802.15, multiband OFDM, OFDM bit-loading, OFDM modulation, personal area networks, power efficiency, reduced-complexity clustered bit-loading algorithm, repeat-accumulate codes, turbo codes, ultra wideband communication, ultra-wideband transmission, UWB communications, wireless personal area networks

In this paper, we analyze the frequency-hopping orthogonal frequency-division multiplexing (OFDM) system known as Multiband OFDM for high-rate wireless personal area networks (WPANs) based on ultra-wideband (UWB) transmission. Besides considering the standard, we also propose and study system performance enhancements through the application of Turbo and Repeat-Accumulate (RA) codes, as well as OFDM bit-loading. Our methodology consists of (a) a study of the channel model developed under IEEE 802.15 for UWB from a frequency-domain perspective suited for OFDM transmission, (b) development and quantification of appropriate information-theoretic performance measures, (c) comparison of these measures with simulation results for the Multiband OFDM standard proposal as well as our proposed extensions, and (d) the consideration of the influence of practical, imperfect channel estimation on the performance. We find that the current Multiband OFDM standard sufficiently exploits the frequency selectivity of the UWB channel, and that the system performs in the vicinity of the channel cutoff rate. Turbo codes and a reduced-complexity clustered bit-loading algorithm improve the system power efficiency by over 6 dB at a data rate of 480 Mbps.


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