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Wide area ubiquitous networks should have the capability to handle more than 10,000 wireless terminals in a large wireless cell with the radius of several kilometers. However, the functions of wireless terminal are severely limited due to low power consumption and low cost requirements. Therefore, there is a need for a sophisticated wireless access system that employs smart wireless signal processing such as the site diversity technique with maximal-ratio-combining at the wireless access point. This paper presents the site diversity technique that employs digitized radio over fiber technology and field test that confirms the effect of site diversity.