Spatial Multiplexing of QPSK Signals With a Single Radio: Antenna Design and Over-the-Air Experiments

This paper describes the implementation and performance analysis of the first fully operational beam-space multiple-input multiple-output (MIMO) antenna for the spatial multiplexing of two QPSK streams. The antenna is composed of a planar three-port radiator with two varactor diodes terminating the passive ports. Pattern reconfiguration is used to encode the MIMO information onto orthogonal virtual basis patterns in the far field. A measurement campaign was conducted to compare the performance of the beam-space MIMO system with a conventional 2 x 2 MIMO system under realistic propagation conditions. Propagation measurements were conducted for both systems and the mutual information and symbol error rates were estimated from Monte-Carlo simulations over the measured channel matrices. The results show the beam-space MIMO system and the conventional MIMO system exhibit similar finite-constellation capacity and error performance in nonline-of-sight scenarios when there is sufficient scattering in the channel. In comparison, in line-of-sight channels, the capacity performance is observed to depend on the relative polarization of the receiving antennas.


Publié dans:
Ieee Transactions On Antennas And Propagation, 64, 12, 5131-5145
Année
2016
Publisher:
Piscataway, Institute of Electrical and Electronics Engineers
ISSN:
0018-926X
Mots-clefs:
Laboratoires:




 Notice créée le 2017-03-27, modifiée le 2018-12-03


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