Robust power allocation algorithms for MIMO OFDM systems with imperfect CSI
This paper presents a Bayesian approach to the design of transmit prefiltering matrices in closed-loop schemes robust to channel estimation errors. The algorithms are derived for a multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) system. Two different optimizat...
| Autores: | , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2005 |
| País: | España |
| Institución: | Universitat Politècnica de Catalunya (UPC) |
| Repositorio: | UPCommons. Portal del coneixement obert de la UPC |
| Idioma: | inglés |
| OAI Identifier: | oai:upcommons.upc.edu:2117/1494 |
| Acceso en línea: | https://hdl.handle.net/2117/1494 |
| Access Level: | acceso abierto |
| Palabra clave: | MIMO systems Bayes methods Channel estimation error Closed loop systems Error statistics Matrix algebra Mean square error methods OFDM modulation Optimisation Singular value decomposition Robust power allocation algorithm OFDM system Imperfect CSI Bayesian approach Prefiltering matrix Closed-loop scheme Bit error rate algorithm Open-loop transmission scheme Channel state information Fading channel Transceiver optimization Wireless communication BER MIMO Channels Power allocations Feedback Diversity Joint transceiver optimization Linear precoding SVD Àrees temàtiques de la UPC::Enginyeria de la telecomunicació::Processament del senyal |
| Sumario: | This paper presents a Bayesian approach to the design of transmit prefiltering matrices in closed-loop schemes robust to channel estimation errors. The algorithms are derived for a multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) system. Two different optimization criteria are analyzed: the minimization of the mean square error and the minimization of the bit error rate. In both cases, the transmitter design is based on the singular value decomposition (SVD) of the conditional mean of the channel response, given the channel estimate. The performance of the proposed algorithms is analyzed, and their relationship with existing algorithms is indicated. As with other previously proposed solutions, the minimum bit error rate algorithm converges to the open-loop transmission scheme for very poor CSI estimates. |
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