Directional Diversity of Smart Antenna in LAS CDMA Systems

  • Authors:

  • Chee Kyun Ng;Nor Kamariah Noordin;Sabira Khatun;Borhanuddin Mohd Ali;Sudhanshu Shekhar Jamuar;Mahamod Ismail

  • Affiliations:

  • Department of Computer and Communication Systems Engineering, Universiti Putra Malaysia, UPM Serdang, Malaysia;Department of Computer and Communication Systems Engineering, Universiti Putra Malaysia, UPM Serdang, Malaysia;Department of Computer and Communication Systems Engineering, Universiti Putra Malaysia, UPM Serdang, Malaysia;Department of Computer and Communication Systems Engineering, Universiti Putra Malaysia, UPM Serdang, Malaysia;Department of Electrical and Electronic Engineering, Faculty of Engineering, Universiti Putra Malaysia, UPM Serdang, Malaysia;Department of Electrical, Electronic and System Engineering, Faculty of Engineering, Universiti Kebangsaan Malaysia, UKM Bangi, Malaysia

  • Venue:
  • Wireless Personal Communications: An International Journal
  • Year:
  • 2008

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Abstract

The performance of code division multiple access (CDMA) systems can be affected by small scale fading such as Rayleigh fading channel. In this paper, the application of smart antenna and Large Area Synchronous CDMA (LAS CDMA) systems, which introduce directional diversity channel, is presented. A novel interference cancellation scheme through dynamic space code (DSC) algorithm is briefly described. The directional diversity can be realized from the directional gain of smart antenna system. It can be found that when the number of elements in smart antenna is increase the directional gain of antenna system is much higher than single antenna. The system performance analysis in term of error probability is compared between traditional and LAS CDMA systems in both single and smart antenna systems. From the performance analysis it is found that CDMA system is more susceptible to multipath fading channel than interferences from existing users.