The influence of efficiency on receive diversity and MIMO capacity for rayleigh-fading channels
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AuthorValenzuela Valdés, Juan Francisco; García Fernández, Miguel Ángel; Martínez González, Antonio Manuel; Sánchez Hernández, David Agapito
Research GroupGrupo de Ingeniería de Microondas, Radiocomunicaciones y Electromagnetismo (GIMRE)
Knowledge AreaTeoría de la Señal y las Comunicaciones
SponsorsThis work was supported in part by the Fundación Séneca, the R&D unit of the Autonomous Region of Murcia (Spain) under project references TIC-TEC 06/01-0003, 07/02-0005 and 05746/PI/07, and in part by the Spanish National R&D Programme through TEC2007/63470/TCM.
PublisherIEEE Antennas and Propagation Society
Bibliographic CitationVALENZUELA VALDÉS, Juan F., GARCÍA FERNÁNDEZ, Miguel A., MARTÍNEZ GONZÁLEZ, Antonio M., SÁNCHEZ HERNÁNDEZ, David. The influence of efficiency on receive diversity and MIMO capacity for rayleigh-fading channels. IEEE Transaction on Antennas and Propagation Letters, 56 (5): 1444- 1450, Mayo 2008. ISSN 0018-926X
KeywordsDiversidad de ganancia
Capacidad del canal
Multiple entrada y multiple salida (MIMO)
Eficiencia de radiación
A previously published guideline for MIMO antenna arrays is refuted. The influence of radiation efficiency on diversity gain and MIMO capacity of wireless communications systems is investigated through simulations and measurements using a reverberation chamber. Integrated antennas on a portable device have efficiencies low enough to disallow typical inter-element correlation assumptions. Both diversity gain and MIMO capacity depend on the number of antennas, SNR and efficiency in a complex way. When the efficiency of antennas is considered, certain system capacity losses are predicted and measured. These losses may be recovered through using more receive elements than commonly recommended or through the addition of a smaller number of more efficient antennas.
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