Interference Detection Based on AIC Using EM Algorithm for UWB MB-OFDM Systems
IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences
Channel-based detection of Sybil attacks in wireless networks
IEEE Transactions on Information Forensics and Security
Parallel continuous-time ΔΣ ADC for OFDM UWB receivers
IEEE Transactions on Circuits and Systems Part I: Regular Papers
Impact of WiMAX interference on MB-OFDM UWB systems: analysis and mitigation
IEEE Transactions on Communications
Performance of BICM-OFDM systems in UWB interference
IEEE Transactions on Wireless Communications
A 1.2V, 130nm CMOS parallel continuous-time ΣΔ ADC for OFDM UWB receivers
Microelectronics Journal
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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.