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• W1535334003 abstract "Ultra Wideband (UWB) communications are steadily gaining acceptance worldwide, as theregulatory bodies of several countries define its frequency bands and rules of operation. OutofthemanytechnologiesavailabletogenerateanUWBsignal,twoofthemhavebeenfavored,in recent standardization activities, namely Orthogonal Frequency Division Multiplexing(OFDM) and Impulse Radio (IR). On one hand the IEEE 802.15.3a standard defines an UWBsignal based on OFDM, which consists of a large number of digitally-generated narrow sub-carriers. On the other hand, the IEEE 802.15.4a standard defines an UWB signal based onpulses of short duration, technology known as IR. In addition to these technologies includedin standards, other modulation schemes have been proposed for UWB, such as frequency-modulated UWB, or IR transmitting even shorter, sub-nanosecond pulses. The latter has theadvantage of providing very accurate ranging and localization estimates based on the time ofarrival, which can be measured with high precision thanks to the large signal bandwidth.In this chapter we will address the challenges encountered in the transmission and detec-tion of an Impulse Radio Ultra Wideband (IR–UWB) signal in environments with multipathpropagation. The main problem in such systems is that multipath produces time dispersionresulting in a very large number of resolvable paths at the receiver. We will argue that it isconsiderably difficult to design receivers that have both high efficiency in capturing the re-ceived signal energy and low complexity. The traditional approaches, such as correlating thereceived signal with a local template, or the RAKE Receiver, suffer from poor performancesince they have to lock to a single propagation path, or a small subset of them, respectively.Non-coherent receivers also fail to deliver the full potential of UWB; in particular, they do notprovide sufficient ranging accuracy.Motivated by this challenge, in this chapter we develop a receiver architecture based on afrequency domain filter bank. The receiver consists mainly of a stage of bandpass filters fol-" @default.
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• W1535334003 date "2010-08-17" @default.
• W1535334003 modified "2023-10-18" @default.
• W1535334003 title "Filter Bank-based Transceiver Design for Ultrawideband" @default.
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• W1535334003 doi "https://doi.org/10.5772/10008" @default.
• W1535334003 hasPublicationYear "2010" @default.
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