Polarization Degrees of Freedom of Hexapolarized MIMO System in the Ground Reflected Channel

Dazhi PIAO
Guizhen LU
Zhixing YANG

Publication
IEICE TRANSACTIONS on Communications   Vol.E94-B    No.5    pp.1284-1287
Publication Date: 2011/05/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E94.B.1284
Print ISSN: 0916-8516
Type of Manuscript: Special Section LETTER (Special Section on Antenna and Propagation Technologies Contributing to Diversification of Wireless Technologies)
Category: MIMO Propagation
Keyword: 
multipolarization MIMO,  ground reflected channel,  DOF,  image theory,  

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Summary: 
The polarization degrees of freedom (DOF) of the hexapolarized multiple input multiple output (MIMO) system over the ground reflected channel is studied in this paper by the deterministic field solution. Using the simple two-ray model, we could get some basic understandings for the influence of a single reflecting surface on the polarization DOF of the multipolarized MIMO system. Computation results show that the number of parallel independent channels in a multipolarized MIMO system depends mainly on the communication range and the height of antennas. In free space transmission, with equal height of transmitter and receiver antennas, large polarization DOF value only occurs in the near field case and it drops sharply to 2 with the increase of transmission range. Whereas for the ground reflect channel, there will be a polarization DOF larger than 4 occurring at longer communication distance with an unequal transmitter and receiver antenna height.