This paper describes quasi-millimeter wave band wireless access systems for high-capacity broadband wireless communications. The 25- and 27-GHz bands have been allocated for nomadic wireless access systems in Japan to increase their system capacity and provide a transmission rate higher than 100 Mbit/s. After describing the application areas and regulatory requirements of the 25/27-GHz-band systems, the paper examines the experimental transmission performance of 25-GHz systems based on orthogonal frequency division multiplexing (OFDM). The issues to be resolved before 25/27-GHz-band systems become feasible are also discussed.
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