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A multiple access scheme for LMDS based on OFDM, O-CDMA and sectored antenna

In this paper, we propose a multi-access scheme based on OFDM/orthogonal-CDMA/sectored antenna for the last mile LMDS applications. Power control is adopted on both the uplink and downlink. Compared to TDMA/FDMA systems, the proposed configuration has a higher capacity and it offers a simpler multi-access scheme. It is more robust against multipath effects and makes it possible to increase the service coverage. Since only a single carrier frequency is used at 28 GHz, the hardware cost is lower than that for TDMA/FDMA systems.