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Author Han-Bae Kong ♦ Changick Song ♦ Haewook Park ♦ Inkyu Lee
Source IEEE Xplore Digital Library
Content type Text
Publisher Institute of Electrical and Electronics Engineers, Inc. (IEEE)
File Format PDF
Copyright Year ©1972
Language English
Subject Domain (in DDC) Natural sciences & mathematics ♦ Physics ♦ Electricity & electronics
Subject Keyword Signal to noise ratio ♦ Relays ♦ Array signal processing ♦ Vectors ♦ MIMO ♦ Harmonic analysis ♦ Transceivers ♦ diversity methods ♦ MIMO systems ♦ relays ♦ transceivers
Abstract In this paper, we propose a new beamforming technique that maximizes the end-to-end signal-to-noise ratio (SNR) for amplify-and-forward multiple-input-multiple-output cooperative relaying systems with direct link between thesource and the destination. Instead of conventional schemes resorting to an iterative method, such as a gradient ascentalgorithm, our scheme provides a simple closed-form solution for source-relay joint beamformer designs. To this end, wefirst derive a new expression of the end-to-end SNR for the cooperative relaying systems and its lower bound, which isgiven as the harmonic mean of two individual SNRs. Then, a new beamforming scheme, which adaptively optimizes one of the two SNRs depending on the channel condition, is proposed. In addition, we perform a diversity order analysis of the proposed scheme and show that our scheme achieves a full diversity order of relaying systems with direct link. It is confirmed by simulation results that the proposed technique obtains almost identical performance to the gradient ascent algorithm with much reduced complexity, and our analytical work accurately predicts the numerical results.
Description Author affiliation :: Sch. of Electr. Eng., Korea Univ., Seoul, South Korea
Author affiliation :: Dept. of Electr. Eng., Imperial Coll. London, London, UK
ISSN 00906778
Education Level UG and PG
Learning Resource Type Article
Publisher Date 2014-01-01
Publisher Place U.S.A.
Rights Holder Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Volume Number 62
Issue Number 7
Size (in Bytes) 1.43 MB
Page Count 10
Starting Page 2286
Ending Page 2295

Source: IEEE Xplore Digital Library