Mimo wireless communication system using polarization diversity

H - Electricity – 04 – B

Patent

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Details

H04B 7/10 (2006.01) H04B 7/04 (2006.01) H04L 1/02 (2006.01) H04B 7/06 (2006.01) H04B 7/08 (2006.01)

Patent

CA 2433437

Previous MIMO systems have used spatially diverse antenna elements in order not to reduce the number of orthogonal channels that can be realised. The present invention recognises that this leads to large antenna sizes, as compared to multiple beam antenna systems which use closely spaced antenna elements. In order to provide a compact antenna unit, whilst still allowing a MIMO system to be exploited, the present invention recognises that polarisation diversity only can be used in a MIMO system without the need for spatially diverse antenna elements. Closely spaced antenna elements are used and this enables a compact MIMO antenna unit to be provided. In addition, such MIMO systems with polarisation diversity but no spatial diversity can advantageously be used in line of sight situations and also combined with multi-beam antenna systems to further increase capacity.

Les systèmes MIMO de l'art antérieur utilisaient des antennes à variations spatiales pour ne pas réduire le nombre de canaux orthogonaux que l'on peut obtenir. Selon la présente invention, on obtient ainsi des antennes de grande taille par rapport aux systèmes d'antennes à multiples faisceaux qui utilisent des antennes étroitement espacées. Pour obtenir un ensemble d'antennes compact, tout en pouvant encore exploiter un système MIMO, la présente invention se fonde sur le principe selon lequel seule la diversité de polarisation peut être utilisée dans un système MIMO sans nécessiter d'antennes à variations spatiales. On utilise des antennes étroitement espacées, ce qui permet d'obtenir une antenne de système MIMO compacte. En outre, ces systèmes MIMO avec une variation de polarisation mais sans variation spatiale peuvent être utilisés de manière avantageuse dans des lignes de visée et combinées également à des systèmes d'antennes à multiples faisceaux pour augmenter la capacité.

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