Power Minimization for CDMA under Colored Noise

Padakandla, Arun and Sundaresan, Rajesh (2009) Power Minimization for CDMA under Colored Noise. In: IEEE Transactions on communications, 57 (10). pp. 3103-3112.

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Abstract

Rate-constrained power minimization (PMIN) over a code division multiple-access (CDMA) channel with correlated noise is studied. PMIN is. shown to be an instance of a separable convex optimization problem subject to linear ascending constraints. PMIN is further reduced to a dual problem of sum-rate maximization (RMAX). The results highlight the underlying unity between PMIN, RMAX, and a problem closely related to PMIN but with linear receiver constraints. Subsequently, conceptually simple sequence design algorithms are proposed to explicitly identify an assignment of sequences and powers that solve PMIN. The algorithms yield an upper bound of 2N - 1 on the number of distinct sequences where N is the processing gain. The sequences generated using the proposed algorithms are in general real-valued. If a rate-splitting and multi-dimensional CDMA approach is allowed, the upper bound reduces to N distinct sequences, in which case the sequences can form an orthogonal set and be binary +/- 1-valued.

Item Type:	Journal Article
Publication:	IEEE Transactions on communications
Publisher:	IEEE
Additional Information:	Copyright 2009 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
Keywords:	Code division multiple access (CDMA); separable convex optimization; linear receivers; inverse eigenvalue problems; sequences
Department/Centre:	Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited:	09 Dec 2009 10:59
Last Modified:	19 Sep 2010 05:52
URI:	http://eprints.iisc.ac.in/id/eprint/24918

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