NDLI: Cross polarisation based extension of closed loop transmit diversity

Content Provider	IEEE Xplore Digital Library
Author	Seeger, A. Grundler, T. Nottensteiner, H. Reinhardt, M. Charpentier, F.
Copyright Year	2004
Description	Author affiliation: Inf. & Commun. Mobile Networks, Siemens AG, Germany (Seeger, A.; Grundler, T.; Nottensteiner, H.; Reinhardt, M.; Charpentier, F.)
Abstract	An extension to Release99 closed loop transmit diversity is proposed by combining uplink based beamforming and polarisation diversity. A generic expression for the polarisation covariance matrix is derived based on the assumption of uncorrelated fading processes for different polarisation states. It becomes evident that the product of the open loop beamforming gain and the two antenna polarisation covariance matrix gives the overall covariance matrix for the proposed transmitter structure. Specialising to 2M/spl plusmn/45/spl deg/ cross polarised transmit antennas it is shown that the overall covariance matrix shows partly correlated fading depending on the cross polarisation discrimination (XPD) and the receive antenna orientation. Simulation results for a system with eight transmit antennas show gains of 7 dB in terms of required transmit power in highly spatially correlated scenarios compared to a spatial diversity based system with two transmit antennas using space-time codes.
Starting Page	279
Ending Page	282
File Size	245142
Page Count	4
File Format	PDF
ISBN	0780383273
DOI	10.1109/WSA.2004.1407696
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2004-03-18
Publisher Place	Germany
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Fading Polarization Array signal processing Transmitters Diversity reception Transmitting antennas Genetic expression Receiving antennas Covariance matrix Gain
Content Type	Text
Resource Type	Article

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