文档介绍：Multiple-Input Multiple-Output munication Systems Using
Antenna Pattern Diversity
Liang Dong, Hao Ling, and Robert W. Heath, Jr.
Department of Electrical puter Engineering
The University ofTexas, Austin, TX 78712
Abstract- Multipleinput multipleoutpnt (MIMO) wireless cialize our results to the case where the antennas are collocated
communication systems employ mnitiple transmit and multiple re- and thus only and polarization, but not antenna spacing,
ceive antennas to obtain significant improvement in channel ca- are the parameters of the spatial This is important
pncity. However, the capacity is limited by the correlation ofsub-
channels in non-ideal scattering envhoments. in this paper, we for mobile app~icationswhere space is extremely limited [I I].
investizate MIMO systems that use antennas with dissimilar radi- First we analyze MIMO channel capacity under correlated fad-
ation patterns to iniraduce decorrelation, hence increasing chan- ing. The MIMO channel is decoupled into sub-channels to
ne1 capacity. We develop a ray tracing model that takes into ac- quantify the of channel correlation. Secondly. we inko-
count both the propagation channel and the transmit and receive duce a general channel model that shows how diver-
antenna patterns. Using putational ic simula-
tor, we show that: (1) MlMO systems that exploit sity is the generaliza