Ultra-wideband Rake Receiver Based on Single-bit ProcessingJ. Nielsen and R. Pasand
Canadian Journal of Electrical and Computer Engineering, Vol. 31, No. 1, pp. 41-48, Winter 2006
Efficient detection of the ultra-wideband (UWB) pulses used in pulse-position-modulation communication links is a challenge due to the combination of a significant level of multipath spreading encountered in indoor wireless channels and the wide bandwidth of the transmitted pulses. If a conventional rake receiver is used, then a large number of fingers are required to capture the pulse energy; this represents a formidable implementation challenge due to the intensive signal processing required. To mitigate the problem, a rake receiver based on uniform sampling and single-bit sampling quantization is proposed. This approach significantly reduces the complexity and processing requirements, so that a large number of rake fingers can be efficiently implemented. The architecture and processing of the proposed receiver, denoted as the single-bit rake (SBR), are described in this paper. A comparative performance analysis of the SBR relative to a conventional rake is also given. As shown in this paper, if the transmitted ultra-wideband pulses are resolvable after passing through the multipath propagation channel, then the penalty of using single-bit quantization is limited to 2 dB compared to a conventional rake receiver with no quantization distortion. For typical indoor wireless propagation channels it is shown that this penalty can typically be avoided by using more rake fingers. However, this incremental processing is relatively insignificant, as uniform single-bit quantization is used. The paper presents further analysis for cases in which the multipath delay spreading is so large that successive UWB pulses significantly overlap. A comparison of the SBR and conventional rakes in terms of power consumption and complexity is also given, demonstrating the advantage of the SBR architecture.
CONTACTS: Reza Pasand, John Nielsen
SUBJECTS: Ultra Wideband
TYPE: Journal Publication
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