Title :
A multiple access scheme for LMDS based on OFDM, O-CDMA and sectored antenna
Author :
Li, Junsong ; Kavehrad, Mohsen
Author_Institution :
Dept. of Electr. Eng., Pennsylvania State Univ., University Park, PA, USA
Abstract :
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
Keywords :
OFDM modulation; code division multiple access; microwave antennas; power control; radio access networks; telecommunication control; 28 GHz; LMDS; O-CDMA; OFDM; capacity; downlink; hardware cost; multipath effects; multiple access scheme; orthogonal-CDMA; power control; sectored antenna; service coverage; uplink; Bandwidth; Costs; Directive antennas; Downlink; Fading; Frequency division multiaccess; Multiaccess communication; OFDM; Polarization; Spread spectrum communication;
Conference_Titel :
Communications, 1999. ICC '99. 1999 IEEE International Conference on
Conference_Location :
Vancouver, BC
Print_ISBN :
0-7803-5284-X
DOI :
10.1109/ICC.1999.767915
