Evaluation of Multiusers’ Interference on Radiolocation in CDMA Cellular Networks

Abstract

Radiolocation has been previously studied for CDMA networks, the effect of Multiple Access Interference has been ignored. In this paper we investigate the problem of Radiolocation in the presence of Multiple Access Interference. An extensive simulation technique was developed, which measures the error in location estimation for different network and user configurations. We include the effects of lognormal shadow and Rayleigh fading. Results that illustrate the effects of varying shadowing losses, number of base stations involved in position location, early-late discriminator offset and cell sizes in conjunction with the varying number of users per cell on the accuracy of radiolocation estimation was presented.

Capacity and Quality Optimization of CDMA Networks

“…We see that the whole process of 3G planning needs to take into account coverage and capacity planning. In a cellular system where all the air interface connections operate on the same carrier, the number of simultaneous users directly influences the receivers' noise floors [5]. Consequently, the performance of any digital modulation technique can be described in terms of the normalized ratio of energy per bit (E b ) to interference density (I o ) required to achieve the minimum desired bit error ratio (BER).…”

Uplink Performance Evaluation of CDMA Communication System with RAKE Receiver and Multiple Access Interference Cancellation

“…C practice, when the transmitted signal passes through mobile radio channel, duplicates of the transmitted signal are generated by reflection, refraction, and diffraction, and the signal power is distributed in multipath. In CDMA system, the transmitted signal bandwidth is much larger than the coherent bandwidth of the channel, in which case the channel is frequency selective [4,8,9]. For the frequency-selective channels, the received signals are multiple copies of the transmitted signals with different channel delays and fading, combining the multipath components as multipath diversity.…”

“…In a low-noise channel with orthogonal spreading sequence,this approach would be optimal. Due to the synchronicity of users and the need to support numerous users, such orthogonality is impossible, even on a hypothetical AWGN (additive white Gaussian noise) channel [4]. Thus, system performance rendered multiple-access interference (MAI) limited, and channel utilization is correspondingly low.…”