An Overview of MAI Effect on the Uplink Performance of the UMTS Air Interface

  • Authors:

  • Hassan Moradi;Mahdi Samie;Maryam Fallah-Pour

  • Affiliations:

  • Iran Telecommunications Research Center, Tehran, Iran;Iran Telecommunications Research Center, Tehran, Iran;Faculty of Electrical Engineering, K. N. Toosi University of Technology, Tehran, Iran

  • Venue:
  • Wireless Personal Communications: An International Journal
  • Year:
  • 2006

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Abstract

Universal Mobile Telecommunications System (UMTS) is the main standard of the third generation of mobile communications and its air interface is called WCDMA. This paper considers the effect of multiple access interference (MAI) on the uplink performance of a simple WCDMA system. The transmitted signal of a defined user is destroyed by interferences from other users and executable resolves are presented and applied. The performance measure is the probability of error, BER, for different number of users. The results indicate that an increase in the number of users would degrade system performance considerably. Furthermore, the channel effect on the signal quality is a problem in transmission that should be considered. The goal of this paper is the observation of uplink performance in presence of MAI. Finally, we represent all ways for resolving the MAI as an undesired effect. FDD mode has been chosen as the operation mode of transmission as well. We consider an identical user's power of received signals at the base station.