Please use this identifier to cite or link to this item: https://doi.org/10.1109/TWC.2012.031212.111585
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dc.titleAchieving global optimality for weighted sum-rate maximization in the K-user Gaussian interference channel with multiple antennas
dc.contributor.authorLiu, L.
dc.contributor.authorZhang, R.
dc.contributor.authorChua, K.-C.
dc.date.accessioned2014-06-17T02:36:27Z
dc.date.available2014-06-17T02:36:27Z
dc.date.issued2012-05
dc.identifier.citationLiu, L., Zhang, R., Chua, K.-C. (2012-05). Achieving global optimality for weighted sum-rate maximization in the K-user Gaussian interference channel with multiple antennas. IEEE Transactions on Wireless Communications 11 (5) : 1933-1945. ScholarBank@NUS Repository. https://doi.org/10.1109/TWC.2012.031212.111585
dc.identifier.issn15361276
dc.identifier.urihttp://scholarbank.nus.edu.sg/handle/10635/54869
dc.description.abstractCharacterizing the global maximum of weighted sum-rate (WSR) for the K-user Gaussian interference channel (GIC), with the interference treated as Gaussian noise, is a key problem in wireless communication. However, due to the users' mutual interference, this problem is in general non-convex and thus cannot be solved directly by conventional convex optimization techniques. In this paper, by jointly utilizing the monotonic optimization and rate profile techniques, we develop a new framework to obtain the globally optimal power control and/or beamforming solutions to WSR maximization problems for the GICs with single-antenna transmitters and single-antenna receivers (SISO), single-antenna transmitters and multi-antenna receivers (SIMO), or multi-antenna transmitters and single-antenna receivers (MISO). Different from prior work, this paper proposes to maximize the WSR in the achievable rate region of the GIC directly by exploiting the facts that the achievable rate region is a "normal" set and the users' WSR is a strictly increasing function over the rate region. Consequently, the WSR maximization is shown to be in the form of monotonic optimization over a normal set and thus can be solved globally optimally by the existing outer polyblock approximation algorithm. However, an essential step in the algorithm hinges on how to efficiently characterize the intersection point on the Pareto boundary of the achievable rate region with any prescribed "rate profile" vector. This paper shows that such a problem can be transformed into a sequence of signal-to-interference-plus-noise ratio (SINR) feasibility problems, which can be solved efficiently by applying existing techniques. Numerical results validate that the proposed algorithms can achieve the global WSR maximum for the SISO, SIMO or MISO GIC, which serves as a performance benchmark for other heuristic algorithms. © 2002-2012 IEEE.
dc.description.urihttp://libproxy1.nus.edu.sg/login?url=http://dx.doi.org/10.1109/TWC.2012.031212.111585
dc.sourceScopus
dc.subjectBeamforming
dc.subjectinterference channel
dc.subjectmulti-antenna system
dc.subjectnon-linear optimization
dc.subjectpower control
dc.subjectweighted sum-rate maximization
dc.typeArticle
dc.contributor.departmentELECTRICAL & COMPUTER ENGINEERING
dc.description.doi10.1109/TWC.2012.031212.111585
dc.description.sourcetitleIEEE Transactions on Wireless Communications
dc.description.volume11
dc.description.issue5
dc.description.page1933-1945
dc.identifier.isiut000304242200031
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