Title :
Performance of LAS-CDMA system using smart antenna
Author :
Ng, Chee Kyun ; Ali, Borhanuddin Mohd ; Khatun, Sabira ; Jamuar, Sudhanshu Shekhar ; Ismail, Mahamod
Author_Institution :
Dept. of Comput. & Commun. Syst. Eng., Putra Malaysia Univ., Malaysia
Abstract :
The choice of CDMA spreading sequences predetermines the properties of the system. The properties of large area synchronous (LAS) CDMA system have been demonstrated an interference free window (IFW) compared to traditional CDMA systems. This IFW property, however, has a limited delay-offset range. It is not always possible that all the channel-induced multipath delay spread components arrives within IFW delay-offset range if the conventional antenna is employed. In this paper, the high directive narrow beam of smart antenna system is employed to direct all the multipath propagation components to arrive within the IFW range. Moreover, smart antenna system with its mathematical model is described. The reduction of multipath propagation in smart antenna system is also described. Finally, system performance analysis in terms of BER and maximum delay spread in both conventional and smart antennas are presented.
Keywords :
antennas; code division multiple access; error statistics; mobile radio; multipath channels; radiofrequency interference; BER; CDMA spreading sequences; channel-induced multipath delay spread components; interference free window; large area synchronous systems; limited delay-offset range; mathematical model; maximum delay spread; multipath propagation components; smart antenna; Antenna accessories; Antennas and propagation; Bit error rate; Delay; Directive antennas; Interference; Mathematical model; Multiaccess communication; Performance analysis; System performance; BER; Gold Code; IFW; LAS-CDMA; Smart Antenna;
Conference_Titel :
Networks, 2005. Jointly held with the 2005 IEEE 7th Malaysia International Conference on Communication., 2005 13th IEEE International Conference on
Print_ISBN :
1-4244-0000-7
DOI :
10.1109/ICON.2005.1635610
