Optimum power allocation for sum rate improvement in AF multi-way relay networks

Shama N. Islam, Salman Durrani, Parastoo Sadeghi

    Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

    Abstract

    In this paper, we formulate and study the optimum power allocation problem in an amplify and forward (AF) multi-way relay network (MWRN). We derive closed-form analytical expressions for the optimum power allocation coefficients for the data power and the pilot power of the users and the relay to maximize the sum rate. We assume that only long term statistical channel state information (CSI) (i.e., channel variance) are available to each user and the relay. Our results show that to achieve the same sum rate, optimum power allocation requires 7-9 dB less transmit power compared to equal power allocation depending on users' channel conditions. In addition, we show that for optimum power allocation, the reduction in the sum rate due to channel estimation errors, becomes less compared to the case of equal power allocation.

    Original languageEnglish
    Title of host publication2014, 8th International Conference on Signal Processing and Communication Systems, ICSPCS 2014 - Proceedings
    EditorsBeata J. Wysocki, Tadeusz A. Wysocki
    PublisherInstitute of Electrical and Electronics Engineers Inc.
    ISBN (Electronic)9781479952557
    DOIs
    Publication statusPublished - 23 Jan 2014
    Event8th International Conference on Signal Processing and Communication Systems, ICSPCS 2014 - Gold Coast, Australia
    Duration: 15 Dec 201417 Dec 2014

    Publication series

    Name2014, 8th International Conference on Signal Processing and Communication Systems, ICSPCS 2014 - Proceedings

    Conference

    Conference8th International Conference on Signal Processing and Communication Systems, ICSPCS 2014
    Country/TerritoryAustralia
    CityGold Coast
    Period15/12/1417/12/14

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