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Offering a large bandwidth under strict transmission power limits, UWB communications can overcome the spectral congestion and consequent performance impairment experienced by narrowband devices operating in common unlicensed frequency bands. The impulse radio (IR) class of UWB systems typically uses time-hopping (TH) and repetition codes. The TH scheme is intended to prevent catastrophic interference...
Ultra-wideband (UWB) wireless technologies have the potential to greatly improve the quality of short-range communications between unlicensed wireless devices. By exploiting huge bandwidth, UWB devices can overcome the spectral congestion and performance impairments experienced by narrowband devices operating in common unlicensed frequency bands. On the other hand, strict constraints on the signal...
Weighted sums of Rayleigh random variables occur in diverse problems in wireless, and particularly in interference systems. Previous work has reported upper bounds on the cumulative distribution function of weighted Rayleigh sums. New lower bounds to the cumulative distribution function of weighted Rayleigh sums are derived. The new lower bounds to the cumulative distribution function are used as...
The uncoordinated nature of impulse radio ultrawide bandwidth (UWB) transmissions leads to multiple-user interference (MUI) at each receiver. Due to use of a repetition code and multipath propagation, a Rake receiver has many partial decision statistics available for use in forming a symbol decision. Novel time-hopped UWB Rake receiver structures have been designed that aim to mitigate MUI by sensing...
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