Title :
Capacity of cdma2000 fixed wireless access system with transmit diversity
Author :
Yavuz, Mehmet ; Chheda, Ashvin
Author_Institution :
Nortel Networks, Richardson, TX, USA
fDate :
6/23/1905 12:00:00 AM
Abstract :
The capacity gain expected from next generation CDMA (IS-2000) fixed wireless access (FWA) networks over current (IS-95) FWA networks is attributed to various factors e.g. fast forward power control and transmit diversity. We study the forward link capacity of a FWA system based on IS-2000 technology for voice traffic with and without space-time spreading (STS) transmit diversity. The study indicates that an urban IS-2000 FWA system using STS can carry about 10-12% more traffic than an urban IS-2000 FWA system not implementing transmit diversity. In suburban environments the gain from STS is on the order of 50%. FWA systems using IS-2000 without transmit diversity can carry about 23% more traffic per sector in the suburban environments than the urban environments. In all these cases we have assumed that sufficient Walsh codes exist to support the carried traffic. In practice, the finite number of Walsh codes may limit the capacity of many FWA systems.
Keywords :
antenna arrays; antenna theory; code division multiple access; radio access networks; transmitting antennas; IS-2000; STS transmit diversity; Walsh codes; capacity gain; cdma2000 fixed wireless access system; fast forward power control; forward link capacity; next generation CDMA networks; space-time spreading transmit diversity; suburban environments; transmit diversity; urban system; voice traffic; Communication system traffic control; Costs; Lakes; Multiaccess communication; Next generation networking; Power control; Shadow mapping; Sociotechnical systems; Space technology; Statistical distributions;
Conference_Titel :
Vehicular Technology Conference, 2001. VTC 2001 Fall. IEEE VTS 54th
Print_ISBN :
0-7803-7005-8
DOI :
10.1109/VTC.2001.956638
