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

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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.

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Correspondence to Hassan Moradi.

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Hassan Moradi received his B.S. degree in Electrical Engineering from Shiraz University, Shiraz, Iran in 1998 and the M.S. in communications systems from K.N. Toosi University of Technology, Tehran, Iran in 2001. He joined the Iran Telecommunications Research Center (ITRC) as an assistant researcher of wireless communications in 2001. Also, he is currently a member of technical staff of ITRC. His current research interests are in Mobile Communications Network, Radio Transmission and Signaling Protocols. He has authored several papers in the wireless communications field especially about access network of CDMA-based systems. Moreover, after finishing Mobile Switching Center (MSC) project in ITRC, he now works and manages the Implementation Switch Lab project at ITRC.

Mahdi Samie received his B.S. in Computer Engineering from Isfahan University of Technology (IUT), Isfahan, Iran, in 1996, and M.S. in Computer System Architecture from Iran University of Science and Technology (IUST), Tehran, Iran in 2001. Since 1999 he is teaching at the department of Computer Engineering in IUST. He joined the Iran Telecommunications Research Center (ITRC) in September of 2001, where he is currently pursuing research on communication protocols for mobile networks as a Research Assistant. His research interest includes Signaling Protocols, Mobile Network Protocols, mobile IP, Digital Transmission and Database in Telecommunication Networks.

Maryam Fallah-Pour received the B.S. degree in Electrical Engineering from K.N. Toosi University of Technology (KNTU), Tehran, Iran in 2003. Her primary current research interests are Industrial Control, Instrumentation, Control of Communication Systems, Software and Hardware design of PLC systems, analysis and modeling of control systems. In addition, she is interested in simulation and implementation of communications protocols. Now, addition to working at Patsa Industry group in Tehran, she is continuing his studies as a M.Sc. student at KNTU.

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Moradi, H., Samie, M. & Fallah-Pour, M. An Overview of MAI Effect on the Uplink Performance of the UMTS Air Interface. Wireless Pers Commun 36, 277–289 (2006). https://doi.org/10.1007/s11277-006-7585-4

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  • DOI: https://doi.org/10.1007/s11277-006-7585-4

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