This paper illustrates a large-scale MIMO propagation channel measurement in a real life environment and evaluates throughput performance of various MIMO schemes in that environment. For that purpose,4×4 MIMO transceivers and a novel spatial scanner are fabricated for
wideband MIMO channel measurements in the 5GHz band. A total of more than 50,000 spatial samples in an area of 150m2, which includes a bedroom,
a Japanese room, a hallway, and the living and dining areas, are taken in
a real residential home environment. Statistical properties of the propagation channel and throughput performance of various MIMO schemes are
evaluated by using measured data. Propagation measurement results show
large dynamic channel variations occurring in a real environment in which
statistical properties of the channel, such as frequency correlation and spatial correlation are not stationary any more, and become functions of the
SNR. Furthermore, evaluation of throughput shows that although MIMO
schemes outperform the SISO system in most areas, open loop systems
perform badly in the far areas with low SNR. Paying for the cost of CSI
or partial CSI at Tx, closed loop and hybrid systems have superior performance
compared to other schemes, especially in reasonable SNR areas ranging from 10dB to 30dB. Spatial correlation, which is common in Japanese wooden residences, is also found to be a dominant factor causing throughput degradation of the open loop MIMO schemes.
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