Per-antenna rate and power control for MIMO layered architectures in the low- and high-power regimes
In 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 i...
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| Tipo de recurso: | artículo |
| Estado: | Versión aceptada para publicación |
| Fecha de publicación: | 2010 |
| País: | España |
| Institución: | Universitat Pompeu Fabra |
| Repositorio: | Repositorio Digital de la UPF |
| OAI Identifier: | oai:repositori.upf.edu:10230/13025 |
| Acceso en línea: | http://hdl.handle.net/10230/13025 http://dx.doi.org/10.1109/TCOMM.2010.02.080557 |
| Access Level: | acceso abierto |
| Palabra clave: | Ràdio Antenes Comunicació sense fil, Sistemes de Spectral efficiency Mutual information MIMO Multiantenna BLAST PARC Low-power High-power |
| Sumario: | In 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. |
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