NDLI: Joint power allocation and interference mitigation techniques for cooperative spread spectrum systems with multiple relays

Content Provider	IEEE Xplore Digital Library
Author	de Lamare, R.C.
Copyright Year	2009
Description	Author affiliation: Communications Research Group, Department of Electronics, University of York, York Y010 5DD, United Kingdom (de Lamare, R.C.)
Abstract	This paper presents joint power allocation and interference mitigation techniques for the downlink of spread spectrum systems which employ multiple relays and the amplify and forward cooperation strategy. We propose a joint constrained optimization framework that considers the allocation of power levels across the relays subject to an individual power constraint and the design of linear receivers for interference suppression. We derive constrained minimum mean-squared error (MMSE) expressions for the parameter vectors that determine the optimal power levels across the relays and the linear receivers. In order to solve the proposed optimization problem efficiently, we develop a joint adaptive power allocation and interference suppression recursive least squares (RLS) algorithm. The proposed RLS algorithm mitigates the interference by adjusting the power levels across the relays and estimating the parameters of the linear receiver. An RLS channel estimation algorithm is also derived to determine the coefficients of the channels across the base station, the relays and the destination terminal. The results of simulations show that the proposed methods obtain significant gains in performance and capacity over non-cooperative systems and cooperative schemes with equal power allocation.
Starting Page	308
Ending Page	312
File Size	147240
Page Count	5
File Format	PDF
ISBN	9781424435845
DOI	10.1109/ISWCS.2009.5285364
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-09-07
Publisher Place	Italy
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Resonance light scattering joint iterative optimization Downlink Vectors Interference constraints Design optimization Frame relay Interference suppression Constraint optimization resource allocation Spread spectrum communication spread spectrum systems Power system relaying cooperative communications
Content Type	Text
Resource Type	Article

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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