Virtual path analysis of selective RAKE receiver in dense multipath channels

Win, Moe Z.; Kostic, Z.

doi:10.1109/4234.803465

Cited by 82 publications

(36 citation statements)

References 14 publications

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“…The optimal diversity combining scheme, in terms of performance, is the all-Rake (ARake) receiver which combines all the resolvable paths [1]- [4]. However the performance gain comes at the cost of power consumption and increased complexity of the utilized hardware, which are significant factors in environments with more than 100 MPCs, such in UWB applications [5].…”

Section: Introductionmentioning

confidence: 99%

Increasing the Efficiency of Rake Receivers for Ultra-Wideband Applications

Doukeli

Lioumpas

Karagiannidis

et al. 2010

Wireless Pers Commun

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Abstract-In diversity rich environments, such as in UltraWideband (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. 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.

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Section: Introductionmentioning

confidence: 99%

Increasing the Efficiency of Rake Receivers for Ultra-Wideband Applications

Doukeli

Lioumpas

Karagiannidis

et al. 2010

Wireless Pers Commun

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“…As in [21]- [24], we consider the maximal-ratio combining of the diversity paths provided by the output of the taps. 1 The term all Rake (ARake) has been largely used in the literature [16]- [18] to indicate the receiver with unlimited resources (taps or correlators) and instant adaptability, so that it can, in principle, combine all of the resolved multipath components [21]- [24]. To achieve this, it requires L r = T d /T c taps, where T d is the maximum excess delay from the instant at which the first path arrives.…”

Section: The Rake Receiversmentioning

confidence: 99%

“…We consider two such reduced-complexity Rake receivers that are referred to as selective Rake (SRake) receivers and partial Rake (PRake) receivers. The SRake receiver selects the L b best paths (a subset of the L r available resolved multipath components) and then combines the selected subset using maximal-ratio combining [16]- [18]. This receiver makes the best use of its L b available fingers, however selection procedure requires 1 Maximum ratio combining is optimum for noise-limited systems with ideal properties of the autocorrelation function of the spreading sequence.…”

Section: The Rake Receiversmentioning

confidence: 99%

“…The outputs of the fingers are appropriately weighted and combined to reap the benefits of multipath diversity. The equivalent matched filter version of the receiver involves a matched front-end processor (MFEP) (matched only to the transmitted waveform) followed by a tapped delay line and a combiner [16]- [18], [21]. The MFEP resolves multipath components whose delays differ by at least one chip duration, T c , approximately equal to the inverse of the spreading bandwidth.…”

Section: The Rake Receiversmentioning

confidence: 99%

“…However, for a finite-complexity receiver, smaller spreading bandwidths might be preferable [16]- [19]. In a recent paper [20], we proposed simplified Rake receiver structures and analyzed their performance in UWB channels.…”

Section: Introductionmentioning

confidence: 99%

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Effects of spreading bandwidth on the performance of UWB RAKE receivers

Cassioli¹,

Win

Vatalaro

et al.

IEEE International Conference on Communications, 2003. ICC '03.

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We consider an ultra-wide bandwidth system using reduced-complexity Rake receivers, which are based on either selective (called SRake) or partial (called PRake) combining of a subset of the available resolved multipath components. We investigate the influence of the spreading bandwidth on the system performance using the two considered types of Rake receivers. We show that, for a fix number of Rake fingers and a fix transmit power, there is an optimum bandwidth. This optimal bandwidth increases with the number of Rake fingers, and is higher for an SRake than for a PRake. We also investigate the effects of the fading statistics (Rayleigh or Nakagami) on the optimal spreading bandwidth. We find that the optimal spreading bandwidth is approximately the same for both types of fading, but that the actual performance of an SRake can be better or worse in Rayleigh fading (compared to Nakagami), depending on the spreading bandwidth and the number of fingers.This work may not be copied or reproduced in whole or in part for any commercial purpose. Permission to copy in whole or in part without payment of fee is granted for nonprofit educational and research purposes provided that all such whole or partial copies include the following: a notice that such copying is by permission of Mitsubishi Electric Research Laboratories, Inc.; an acknowledgment of the authors and individual contributions to the work; and all applicable portions of the copyright notice. Copying, reproduction, or republishing for any other purpose shall require a license with payment of fee to Mitsubishi Electric Research Laboratories, Inc. All rights reserved. Abstract-We consider an ultra-wide bandwidth system using reduced-complexity Rake receivers, which are based on either selective (called SRake) or partial (called PRake) combining of a subset of the available resolved multipath components. We investigate the influence of the spreading bandwidth on the system performance using the two considered types of Rake receivers. We show that, for a fix number of Rake fingers and a fix transmit power, there is an optimum bandwidth. This optimal bandwidth increases with the number of Rake fingers, and is higher for an SRake than for a PRake. We also investigate the effects of the fading statistics (Rayleigh or Nakagami) on the optimal spreading bandwidth. We find that the optimal spreading bandwidth is approximately the same for both types of fading, but that the actual performance of an SRake can be better or worse in Rayleigh fading (compared to Nakagami), depending on the spreading bandwidth and the number of fingers.

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Adaptive modulation and combining for bandwidth and power efficient communication over fading channels

Belhaj

Hamdi

Alouini

et al. 2006

Wireless Communications

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Traditional fading mitigation techniques are designed relative to the worst‐case channel conditions, resulting in a poor utilization of the spectrum and the available power a good percentage of the time. In contrast, we introduce and investigate in this paper new adaptive modulation and diversity combining techniques that jointly select the most appropriate constellation size and the most suitable diversity branches in response to the channel variation and given a desired bit error rate (BER) requirement. Numerical results show that these newly proposed adaptive modulation and combining schemes can reduce considerably the average receiver channel estimation complexity as well as the power drain from the battery while offering high spectral efficiency and satisfying the desired outage probability and BER requirements. Copyright © 2006 John Wiley & Sons, Ltd.

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Virtual path analysis of selective RAKE receiver in dense multipath channels

Cited by 82 publications

References 14 publications

Increasing the Efficiency of Rake Receivers for Ultra-Wideband Applications

Increasing the Efficiency of Rake Receivers for Ultra-Wideband Applications

Effects of spreading bandwidth on the performance of UWB RAKE receivers

Adaptive modulation and combining for bandwidth and power efficient communication over fading channels

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