Increasing the Efficiency of Rake Receivers for Ultra-Wideband Applications

Authors:
Aimilia P. Doukeli;Athanasios S. Lioumpas;George K. Karagiannidis;Panayiotis V. Frangos
Affiliations:
School of Electrical and Computer Engineering, National Technical University of Athens, Athens, Greece;Division of Telecommunications, Electrical and Computer Engineering Department, Aristotle University of Thessaloniki, Thessaloniki, Greece 54124;Division of Telecommunications, Electrical and Computer Engineering Department, Aristotle University of Thessaloniki, Thessaloniki, Greece 54124;School of Electrical and Computer Engineering, National Technical University of Athens, Athens, Greece
Venue:
Wireless Personal Communications: An International Journal
Year:
2012

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Abstract

In diversity rich environments, such as in Ultra-Wideband (UWB) applications, the a priori determination of the number of strong diversity branches is difficult, because of the considerably large number of diversity paths, which are characterized by a variety of power delay profiles (PDPs). Several Rake implementations have been proposed in the past, in order to reduce the number of the estimated and combined paths. To this aim, we introduce two adaptive Rake receivers, which combine a subset of the resolvable paths considering simultaneously the quality of both the total combining output signal-to-noise ratio (SNR) and the individual SNR of each path, reducing the number of combined paths, while keeping the desirable performance. These schemes achieve better adaptation to channel conditions compared to other known receivers, without further increasing the complexity. Their performance is evaluated in different practical UWB channels, whose models are based on extensive propagation measurements. The proposed receivers compromise between the power consumption, complexity and performance gain for the additional paths, resulting in important savings in power and computational resources.