Title :
Interference analysis of TDD-CDMA systems with directional antennas
Author :
Wang, Li-Chun ; Huang, Shi-Yen ; Tseng, Yu-Chee
Author_Institution :
Dept. of Commun. Eng., Nat. Chiao Tung Univ., Hsinchu, Taiwan
Abstract :
This paper explores the advantages of using directional antennas in TDD-CDMA systems with asymmetric traffic. In a TDD-CDMA system, asymmetric traffic from neighboring cells may cause cross-slot interference, which can seriously degrade system capacity. We analyze the cross-slot interference of a TDD-CDMA system with a trisector cellular architecture, where three directional antennas are employed at each base station. We find that the directivity of directional antennas can provide an additional degree of freedom for allocating resources. This advantage enables the TDD-CDMA system to support asymmetric uplink and downlink traffic with different rates of asymmetry among neighboring cells in the entire system.
Keywords :
cellular radio; code division multiple access; directive antennas; interference (signal); resource allocation; time division multiple access; TDD-CDMA system interference analysis; antenna directivity; asymmetric traffic; asymmetry rates; base station directional antennas; downlink traffic; neighboring cell cross-slot interference; resource allocation; time division duplex; tri-sector cellular architecture; uplink traffic; Base stations; Computer science; Degradation; Directional antennas; Downlink; Frequency; Information analysis; Interference; Multiaccess communication; Resource management;
Conference_Titel :
Vehicular Technology Conference, 2003. VTC 2003-Fall. 2003 IEEE 58th
Print_ISBN :
0-7803-7954-3
DOI :
10.1109/VETECF.2003.1285246
