Discrete-phase constant envelope precoding for massive MIMO systems

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dc.citation.epage2021en_US
dc.citation.issueNumber5en_US
dc.citation.spage2011en_US
dc.citation.volumeNumber65en_US
dc.contributor.authorKazemi, M.en_US
dc.contributor.authorAghaeinia, H.en_US
dc.contributor.authorDuman, T. M.en_US
dc.date.accessioned2018-04-12T11:02:59Z
dc.date.available2018-04-12T11:02:59Z
dc.date.issued2017en_US
dc.departmentDepartment of Electrical and Electronics Engineeringen_US
dc.description.abstractWe consider downlink of a multiuser massive multiple-input multiple-output (MIMO) system and focus on reducing the hardware costs by using a single common power amplifier and separate phase shifters (PSs) for antenna front-ends. In the previous literature, the use of analog PSs in this setup has been considered. Here, we study the use of practical digital PSs, which only support a limited set of discrete phases. Considering the sum of interference powers as a metric, we formulate the corresponding nonlinear discrete optimization problem and solve for the phases to be used during transmission. We devise a low-complexity algorithm, which employs a trellis structure providing suboptimal, but efficient and effective solutions. We demonstrate via examples that the proposed solutions have comparable performance to conventional analog PS-based algorithms. Furthermore, we prove that by utilizing discrete-phase constant envelope precoding, the interference can be made arbitrarily small by increasing the number of antennas. Therefore, the asymptotic gains promised by massive MIMO systems are preserved. We also obtain closed-form expressions for the rate loss due to errors in the phase and amplitude of the PSs, for both low and high SNR regimes.en_US
dc.description.provenanceMade available in DSpace on 2018-04-12T11:02:59Z (GMT). No. of bitstreams: 1 bilkent-research-paper.pdf: 179475 bytes, checksum: ea0bedeb05ac9ccfb983c327e155f0c2 (MD5) Previous issue date: 2017en
dc.identifier.doi10.1109/TCOMM.2017.2667663en_US
dc.identifier.issn0090-6778
dc.identifier.urihttp://hdl.handle.net/11693/37106
dc.language.isoEnglishen_US
dc.publisherInstitute of Electrical and Electronics Engineers Inc.en_US
dc.relation.isversionofhttp://dx.doi.org/10.1109/TCOMM.2017.2667663en_US
dc.source.titleIEEE Transactions on Communicationsen_US
dc.subjectConstant envelope precodingen_US
dc.subjectDigital phase shifteren_US
dc.subjectDiscrete optimizationen_US
dc.subjectMassive MIMOen_US
dc.subjectMultiuser MIMOen_US
dc.subjectComputational complexityen_US
dc.titleDiscrete-phase constant envelope precoding for massive MIMO systemsen_US
dc.typeArticleen_US

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