Adaptive Interference Avoidance with Pre-RAKE Diversity Combining for High-Data-Rate UWB Systems

Xuewen LIAO  Shihua ZHU  Erlin ZENG  

IEICE TRANSACTIONS on Communications   Vol.E91-B   No.10   pp.3347-3350
Publication Date: 2008/10/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e91-b.10.3347
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technologies
Ultra-wideband,  Pre-RAKE,  Pre-Equalization,  Adaptive Interference Avoidance (AIA),  

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Multipath energy capture and inter-symbol interference (ISI) are two intractable problems in high-data-rate Ultra-wideband (UWB) systems. To tackle the problems and simplify the receiver, we propose an adaptive interference avoidance scheme based on Pre-RAKE combining technique. The symbol repetition period (SRP) is regarded a changeable parameter in an ordered set to avoid severe interference paths and guarantee high data-rate. The set is known to both the transmitter and receiver. The index of the selected SRP is then sent to the receiver to coordinate the transmitter and receiver. The SRP can be updated adaptively according to the variations of the channels. Both theoretical analysis and simulations show that the ISI is mitigated and the transmission rate is improved simultaneously compared to the constant SRP transmission scheme.