DocumentCode :
1986508
Title :
Transparent user-specific 3D MIMO in FDD using beamspace methods
Author :
Thomas, Timothy A. ; Vook, Frederick W.
Author_Institution :
Nokia Siemens Networks, Arlington Heights, IL, USA
fYear :
2012
fDate :
3-7 Dec. 2012
Firstpage :
4618
Lastpage :
4623
Abstract :
In typical macro-cell deployments for 3GPP LTE the base station employs an array of cross-polarized or co-polarized antennas that are linearly spaced in azimuth. In many panel array designs used in cellular deployments, each antenna port is actually formed by co-phasing some number of vertically-arranged physical sub-elements to achieve a desired elevation pattern and overall gain. If these vertically-arranged sub-elements could be individually and adaptively controlled then the antenna array could adapt its transmission in both the elevation and azimuth dimensions on a per-user basis (aka 3D MIMO) while maintaining the same form factor as the original array. In this paper we consider the problem of incorporating user-specific 3D-MIMO into the LTE FDD OFDMA downlink in a way that is transparent to the existing mobile devices. We propose using the beamspace concept along with uplink transmissions to control the elevation dimension while using the existing LTE codebook feedback methods to control the azimuth dimension. We show that the ability to adapt in both the elevation and azimuth dimensions on a per-user basis can provide significant gains in performance.
Keywords :
3G mobile communication; Long Term Evolution; MIMO communication; OFDM modulation; antenna arrays; frequency division multiple access; frequency division multiplexing; mobile antennas; 3GPP LTE; LTE FDD OFDMA downlink; LTE codebook feedback methods; antenna port; azimuth dimensions; base station; beamspace methods; cellular deployments; copolarized antenna array; cross-polarized antenna array; elevation dimensions; mobile devices; panel array designs; transparent user-specific 3D MIMO; uplink transmissions; vertically-arranged physical subelements; 3D MIMO; LTE; MIMO Elevation beamforming;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Global Communications Conference (GLOBECOM), 2012 IEEE
Conference_Location :
Anaheim, CA
ISSN :
1930-529X
Print_ISBN :
978-1-4673-0920-2
Electronic_ISBN :
1930-529X
Type :
conf
DOI :
10.1109/GLOCOM.2012.6503847
Filename :
6503847
Link To Document :
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