Exploiting Transmit Correlation and Mutual Coupling in MIMO Transmitters

Konferenz: European Wireless 2014 - 20th European Wireless Conference
14.05.2014 - 16.05.2014 in Barcelona, Spain

Tagungsband: European Wireless 2014

Seiten: 6Sprache: EnglischTyp: PDF

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Masouros, Christos; Tong, Kenneth (Dept. of Electrical & Electronic Eng., University College London, London, UK)
Chen, Jianling (School of Electrical Eng. and Information, Beijing Jiaotong University, Beijing, China)
Sellathurai, Mathini (School of Eng. and Physical Sciences, Herriot Watt University, Edinburgh, UK)
Ratnarajah, Tharmalingam (School of Engineering, University of Edinburgh, Edinburgh, UK)

We explore the potential of advantageously utilizing transmit correlation and mutual coupling in large-scale multiple input multiple output (MIMO) transmitters using low complexity closed form precoding techniques. Towards this end, we investigate the effect of increasing the number of antenna elements in a fixed transmitter space. This gives rise to two contradicting phenomena: the reduction of spatial diversity due to reducing the separation between antennas and the increase in transmit diversity by increasing the number of elements. We explore a precoding technique that exploits the increasing transmit correlation and mutual coupling to improve the received signal power. We investigate densely deployed uniform linear antenna arrays modeled in the CST Microwave Studio. The simulations show the somewhat surprising result that, by reducing the separations between the antennas to significantly less than the transmit wavelength to fit more antennas, improved performance is obtained.