Lozano Solsona, Angel2011-11-112011-11-112010Lozano A. Per-antenna rate and power control for MIMO layered architectures in the low- and high-power regimes. IEEE Transactions on Communications. 2010; 58(2): 652-659. DOI 10.1109/TCOMM.2010.02.0805570090-6778http://hdl.handle.net/10230/13025In a MIMO layered architecture, several codewords/nare transmitted from a multiplicity of antennas. Although the/nspectral efficiency is maximized if the rates of these codewords/nare separately controlled, the feedback rate within the link/nadaptation loop is reduced if they are constrained to be identical./nThis poses a direct tradeoff between performance and/nfeedback overhead. This paper provides analytical expressions/nthat quantify the difference in spectral efficiency between both/napproaches for arbitrary numbers of antennas. Specifically, the/ncharacterization takes place in the realm of the low- and highpower/nregimes via expansions that are shown to have a wide/nrange of validity./nIn addition, the possibility of adjusting the transmit power/nof each codeword individually is considered as an alternative to/nthe separate control of their rates. Power allocation, however,/nturns out to be inferior to rate control within the context of this/nproblem.application/pdfeng© 2010 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works./nThe final published article can be found at http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=5407630&isnumber=5407594Ràdio AntenesComunicació sense fil, Sistemes deinfo:eu-repo/semantics/articlehttp://dx.doi.org/10.1109/TCOMM.2010.02.080557Spectral efficiencyMutual informationMIMOMultiantennaBLASTPARCLow-powerHigh-powerinfo:eu-repo/semantics/openAccess