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

Volume

2

fYear

2003

fDate

6-9 Oct. 2003

Firstpage

1369

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Vehicular Technology Conference, 2003. VTC 2003-Fall. 2003 IEEE 58th

ISSN

1090-3038

Print_ISBN

0-7803-7954-3

Type

conf

DOI

10.1109/VETECF.2003.1285246

Filename

1285246