Abstract：Orientation of the receive and transmit antenna arrays is always omitted while researching the performance of wireless channels. This paper investigates the impact on spatial correlation and capacity of MIMO （Multiple-lnput Multiple-Output） wireless channels, and obtains that the impact can not be neglected if angular spread is small, and that the antenna arrays should be rotated to make array＇s normal point to the mean direction of arrival or departure （DOA or DOD） to attain higher capacity. Numerical results verify the impact on spatial correlation, and show that it increases with the departure ofarray＇s normal from the mean DOA or DOD. The simulation results indicate that orientation of the array with smaller angular spread dominates the impact on MIMO channel capacity and that increasing angular spread diminishes, or even eliminates this impact.
2005, Vol. 27 
