Electrical and Electronic Engineering - Research Publications

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Author: Dey, Subhrakanti × Subject: Communications Technologies × Start date: 2006 × Type: Journal Article ×

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    Outage Capacity and Optimal Power Allocation for Multiple Time-Scale Parallel Fading Channels
    Dey, S ; Evans, JS (Institute of Electrical and Electronics Engineers (IEEE), 2007-07)
    In this paper, we address the optimal power allocation problem for minimizing capacity outage probability in multiple time-scale parallel fading channels. Extending ideas from [1], we derive the optimal power allocation scheme for parallel fading channels with fast Rayleigh fading, as a function of the slow fading gains. Numerical results are presented to demonstrate the outage performance of this scheme for lognormal slow fading on two parallel channels.
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    A power control game based on outage probabilities for multicell wireless data networks
    Alpcan, T ; Basar, T ; Dey, S (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2006-04-01)
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    Outage-based Optimal Power Control for Generalized Multiuser Fading Channels
    Papandriopoulos, J ; Evans, JS ; Dey, S (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2006-04)
    We address the problem of achieving outage probability constraints on the uplink of a code-division multiple-access (CDMA) system employing power control and linear multiuser detection, where we aim to minimize the total expended power. We propose a generalized framework for solving such problems under modest assumptions on the underlying channel fading distribution. Unlike previous work, which dealt with a Rayleigh fast-fading model, we allow each user to have a different fading distribution. We show how this problem can be formed as an optimization over user transmit powers and linear receivers, and, where the problem is feasible, we provide conceptually simple iterative algorithms that find the minimum power solution while achieving outage specifications with equality. We further generalize a mapping from outage probability specifications to average signal-to-interference-ratio constraints that was previously applicable only to Rayleigh-faded channels. This mapping allows us to develop suboptimal, computationally efficient algorithms to solve the original problem. Numerical results are provided that validate the iterative schemes, showing the closeness of the optimal and mapped solutions, even under circumstances where the map does not guarantee that constraints will be achieved.
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