Performance analysis of cellular radio systems in fading and correlated shadowing environments

ABSTRACT PERFORMANCE ANALYSIS OF CELLULAR RADIO SYSTEMS IN FADING AND CORRELATED SHADOWING ENVIRONMENTS İbrahim Baran USLU M.Sc. Thesis DEPARTMENT OF ELECTRICAL-ELECTRONICS ENGINEERING Supervisor: Asst. Prof. Dr. Aysel ŞAFAK January, 2003 The performance of cellular radio systems was investigated in multipath fading, correlated shadowing and additive white Gaussian noise environments for FSK, PSK and DPSK modulation with omnidirectional, directional and adaptive antennas. Both desired and interfering signals are assumed to be under flat fading and correlated shadowing in the channel. System performance is evaluated in terms of probability of co-channel interference, bit error rate and spectrum efficiency. Formulas for evaluating the performance of cellular radio systems are presented. The effects of bit energy to noise power ratio (Eb/No), signal-to- noise power ratio (ZJ £u), frequency reuse distance (Ru), cluster size (C), shadow spread (a), correlation coefficient between the signals (p), number of interferers (n), Rician factor (K), channel usage efficiency (r\), total number of channels per cell (M), number of antenna elements (u) and some traffic parameters, on the performance of cellular systems were studied. Computer simulations are carried out for evaluating the benefits of using adaptive antennas in mobile communications in terms of spectrum efficiency and system performance. Results show that application of adaptive antenna arrays increase the spectrum efficiency and the performance of the cellular systems. Keywords: Cell, cellular mobile radio system, frequency reuse, co-channel interference, spectral efficiency, sectorization, fading, correlated shadowing, adaptive beamforming, LMS algorithm. VI