This paper describes research and development of broadband wireless access technologies aiming at mobile/nomadic/fixed broadband wireless access systems. It introduces key technologies detailed in the other selected papers in this issue, including SDM-COFDM (space division multiplexed, coded orthogonal frequency division multiplexing) over MIMO (multiple input multiple output) channels, broadband wireless access systems using quasi-millimeter wave, mesh-type wireless systems, and a ubiquitous network concept for economical public LAN services.
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