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IEEE 802.15.4a impulse radio-time hopping ultra wideband (IR-TH UWB) physical layer, due to small duty cycle and veryshort pulse widths is robust against multipath propagation. However,scattering and reflections with the large number of obstacles in indoorchannel environments, give rise to dense multipath fading. It imposesserious problem to optimum Rake receiver architectures, for whichvery large number of fingers are needed. Presence of strong noisealso affects the reception of fine pulses having extremely low powerspectral density. A robust SRake receiver for IEEE 802.15.4a IRTHUWB in dense multipath and additive white Gaussian noise(AWGN) is proposed to efficiently recover the weak signals withmuch reduced complexity. It adaptively increases the signal to noise(SNR) by decreasing noise through a recursive least square (RLS)algorithm. For simulation, dense multipath environment of IEEE802.15.4a industrial non line of sight (NLOS) is employed. The powerdelay profile (PDF) and the cumulative distribution function (CDF)for the respective channel environment are found. Moreover, the errorperformance of the proposed architecture is evaluated in comparisonwith conventional SRake and AWGN correlation receivers. Thesimulation results indicate a substantial performance improvementwith very less number of Rake fingers.

A Robust Reception of IEEE 802.15.4a IR-TH UWB in Dense Multipath and Gaussian Noise