Downlink beamforming under individual SINR and per antenna power constraints

dc.contributor.authorYazarel, Y. K.en_US
dc.contributor.authorAktaş, Defneen_US
dc.coverage.spatialVictoria, BC, Canada
dc.departmentDepartment of Electrical and Electronics Engineeringen_US
dc.descriptionDate of Conference: 22-24 Aug. 2007
dc.descriptionConference name: 2007 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing
dc.description.abstractIn this paper we consider the problem of finding the optimum beamforming vectors for the downlink of a multiuser system, where there are individual signal to interference plus noise ratio (SINR) targets for each user. Majority of the previous work on this problem assumed a total power constraint on the base stations. However, since each transmit antenna is limited by the amount of power it can transmit due to the limited linear region of the power amplifliers, a more realistic constraint is to place a limit on the per antenna power. In a recent work, Yu and Lan proposed an iterative algorithm for computing the optimum beamforming vectors minimizing the power margin over all antennas under individual SINR and per antenna power constraints. However, from a system designer point of view, it may be more desirable to minimize the total transmit power rather than minimizing the power margin, especially when the system is not symmetric. Reformulating the transmitter optimization problem to minimize the total transmit power subject to individual SINR constraints on the users and per antenna power constraints on the base stations, the algorithm proposed by Yu and Lan is modified. Performance of the modified algorithm is compared with existing methods for various cellular array scenarios. ©2007 IEEE.en_US
dc.source.title2007 IEEE Pacific RIM Conference on Communications, Computers, and Signal Processing - Proceedingsen_US
dc.subjectAntenna accessoriesen_US
dc.subjectBase stationsen_US
dc.subjectBoolean functionsen_US
dc.subjectComputer systemsen_US
dc.subjectElectric power utilizationen_US
dc.subjectIterative methodsen_US
dc.subjectLight polarizationen_US
dc.subjectSignal interferenceen_US
dc.subjectSignal processingen_US
dc.subjectSignal to noise ratioen_US
dc.subjectDownlink (DL)en_US
dc.subjectDownlink beam-formingen_US
dc.subjectIndividual (PSS 544-7)en_US
dc.subjectIterative algorithmsen_US
dc.subjectLinear regionsen_US
dc.subjectMulti user systemsen_US
dc.subjectPacific Rimen_US
dc.subjectPer-antenna power constraintsen_US
dc.subjectPower marginsen_US
dc.subjectSignal-to-Interference plus Noise-Ratio (SINR)en_US
dc.subjectSystem designersen_US
dc.subjectTotal poweren_US
dc.subjectTotal transmit poweren_US
dc.subjectTransmit antennasen_US
dc.subjectTransmitter optimizationen_US
dc.titleDownlink beamforming under individual SINR and per antenna power constraintsen_US
dc.typeConference Paperen_US
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