Asymptotically optimum energy profile for successive interference cancellation in DS-CDMA under a power unbalance constraint

Sala Álvarez, José; Rey Micolau, Francesc; Villares Piera, Nemesio Javier

doi:10.1109/LCOMM.2011.121311.111964

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Sala Álvarez, José

Rey Micolau, Francesc

Villares Piera, Nemesio Javier

Document typeArticle

Defense date2012-02

Rights accessOpen Access

All rights reserved. This work is protected by the corresponding intellectual and industrial property rights. Without prejudice to any existing legal exemptions, reproduction, distribution, public communication or transformation of this work are prohibited without permission of the copyright holder

Abstract

A new Ordinary Differential Equation (ODE) governing the SNIR evolution of a Successive Interference Canceller (SIC) for DS-CDMA is derived when the number of users tends to infinity and all users share the same channel encoder. Using Variational Calculus, this ODE is applied to obtaining the energy profile that maximizes the average spectral efficiency when a constraint on the power unbalance (maximum power to minimum power ratio) of received users is enforced. The conditions for extremality of the optimum energy profile are established in terms of the common encoder's Packet Error Rate (PER) function.

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© 2011 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes,creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.

CitationSala, J.; Rey, F.; Villares, Javier. Asymptotically optimum energy profile for successive interference cancellation in DS-CDMA under a power unbalance constraint. "IEEE communications letters", Febrer 2012, vol. 16, núm. 2, p. 172-175.

URIhttp://hdl.handle.net/2117/15654

DOI10.1109/LCOMM.2011.121311.111964

ISSN1089-7798

Publisher versionhttps://ieeexplore.ieee.org/document/6109196

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Asymptotically optimum energy profile for successive interference cancellation in DS-CDMA under a power unbalance constraint

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