DocumentCode :
2346506
Title :
Impact of polarization on the achievable rate of MIMO systems with linear receivers
Author :
Ispas, Adrian ; Sun, Cuiling ; Schneider, Christian ; Gong, Xitao ; Ascheid, Gerd ; Thomä, Reiner
Author_Institution :
Dept. of Integrated Signal Process. Syst., RWTH Aachen Univ., Aachen, Germany
fYear :
2012
fDate :
9-12 Sept. 2012
Firstpage :
2043
Lastpage :
2048
Abstract :
The extension of multiple-input multiple-output (MIMO) systems to the polarization domain is known to have potential benefits in terms of the spectral efficiency. It is thus of importance to understand how the channel influences the spectral efficiency, e.g., when a dual-polarized (DP) antenna setup should be favored over a single-polarized (SP) one. In this work, we study the achievable rate, i.e., the sum mutual information (MI) of all transmitted streams, over DP MIMO channels with linear receivers. We derive an approximation of the sum MI with a linear minimum mean squared error (LMMSE) or a zero forcing receiver which is an explicit function of statistical channel parameters. The evaluations of selected 4×4 SP and DP MIMO setups are based on channel measurements performed at 2.53 GHz in an urban macrocell scenario. The results reveal that DP antenna setups can yield substantial gains in the sum MI on links with high K-factors and high signal-to-noise ratios (SNRs). Moreover, the degradation in the sum MI with two streams due to the use of an LMMSE receiver is found to be small, especially for the DP antenna setup. The approximate evaluation of the sum MI is able to reproduce the SNR threshold region in which a second transmitted stream should be activated or one should switch from an SP to a DP antenna setup.
Keywords :
MIMO communication; UHF antennas; antenna arrays; electromagnetic wave polarisation; least mean squares methods; radio receivers; statistical analysis; wireless channels; DP MIMO channels; DP antenna; LMMSE receiver; MIMO systems; SNR; SNR threshold region; channel measurements; dual-polarized antenna; frequency 2.53 GHz; high k-factors; high signal-to-noise ratios; linear minimum mean squared error; linear receivers; multiple-input multiple-output systems; polarization domain; single-polarized antenna; spectral efficiency; statistical channel parameter explicit function; sum mutual information; urban macrocell scenario; zero forcing receiver; Antenna measurements; Antennas; Approximation methods; MIMO; Receivers; Signal to noise ratio; Vectors;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Personal Indoor and Mobile Radio Communications (PIMRC), 2012 IEEE 23rd International Symposium on
Conference_Location :
Sydney, NSW
ISSN :
2166-9570
Print_ISBN :
978-1-4673-2566-0
Electronic_ISBN :
2166-9570
Type :
conf
DOI :
10.1109/PIMRC.2012.6362690
Filename :
6362690
Link To Document :
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