Spatial Reciprocity of Uplink and Downlink Radio Channels in FDD Systems

We investigate the congruence of the directional properties of uplink (UL) and downlink (DL) as seen from the base station in WCDMA of UMTS by means of spatial channel measurements. Our study illustrates that the directional properties of the mobile radio channel are strongly correlated in uplink and downlink radio channels. Therefore, the utilization of spatial information derived during uplink reception for downlink smart antenna transmission is reasonable.

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