Improving Wireless TDMA/FDD MAC Performance with Multi-beam Directional Antennas

Abstract

Abstract—In this work presented, the effects of the multi-beam directional antennas on the performance of a new wireless TDMA/FDD system have been studied. Directional antennas (DA) inherently have the ability to enable development of the SDMA systems, and to allow transmitting and receiving signals simultaneously at the same time slot. Employing a dynamic slot allocation table at the base station with 4 or 8 sector directional antennas and holding the wireless terminals location information, a new SDMA/TDMA/FDD frame structure has been developed for wireless communications. The preliminary simulation results obtained using OPNET Modeler show that the proposed SDMA/TDMA/FDD system has substantially increased the traditional TDMA/FDD system capacity and provides 1.37 to 4 times better mean delay results when the number of users is increased from 4 to 32 under the same load in the wireless network models. Index Terms—SDMA/TDMA, Directional Antennas, MAC I.

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