naa a22 4500 510795676 CHVBK 20180411083335.0 cr unu---uuuuu 180411e20130201xx s 000 0 eng 10.1007/s11277-012-0504-y doi (NATIONALLICENCE)springer-10.1007/s11277-012-0504-y Effects of Nakagami-Fading Parameters and Power Control Error on Performance of DS-CDMA Cellular Systems with Adaptive Beamforming [Elektronische Daten] [Mohamad Dosaranian-Moghadam, Hamidreza Bakhshi, Gholamreza Dadashzadeh] It is well known that power control error (PCE) is a critical issue in CDMA cellular systems. In this paper, the bit error rate (BER) of a direct sequence-code division multiple access (DS-CDMA) receiver with imperfect power control, adaptive beamforming, and voice activity is derived in frequency-selective Nakagami fading channels. We discuss the effects of PCE, Nakagami-m fading parameter, and channel's multipath intensity profile as average signal strength and rate of average power decay and their effects on the BER performance of DS-CDMA cellular systems. In this paper, the RAKE receiver consists of three stages. In the first stage, with conjugate gradient adaptive beamforming algorithm, the desired users' signal in an arbitrary path is passed and the inter-path interference is canceled in other paths in each RAKE finger. Also in this stage, the multiple access interference (MAI) from other users is reduced. Thus, the matched filter (MF) can be used for the MAI reduction in each RAKE finger in the second stage. In the third stage, the output signals from the MFs are combined according to the conventional maximal ratio combining principle and then are fed into the decision circuit for the desired user. How the Nakagami fading parameters, power control imperfections, or the number of resolvable paths affect the reverse link capacity of the system is discussed in detail. Analytical and simulation results are also given for systems with different processing gains and number of BSs in the cell-selection process with various Nakagami fading parameters. Springer Science+Business Media, LLC., 2012 Adaptive beamforming nationallicence DS-CDMA nationallicence Multipath intensity profile nationallicence Nakagami fading channel nationallicence Power control error nationallicence Voice activity nationallicence Dosaranian-Moghadam Mohamad Department of Electrical Engineering, Qazvin Branch, Islamic Azad University, Qazvin, Iran aut Bakhshi Hamidreza Department of Electrical Engineering, University of Shahed, Tehran, Iran aut Dadashzadeh Gholamreza Department of Electrical Engineering, University of Shahed, Tehran, Iran aut Wireless Personal Communications Springer US; http://www.springer-ny.com 68/3(2013-02-01), 1197-1223 0929-6212 68:3<1197 2013 68 11277 https://doi.org/10.1007/s11277-012-0504-y text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11277-012-0504-y text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Dosaranian-Moghadam Mohamad Department of Electrical Engineering, Qazvin Branch, Islamic Azad University, Qazvin, Iran aut NATIONALLICENCE 700 1- Bakhshi Hamidreza Department of Electrical Engineering, University of Shahed, Tehran, Iran aut NATIONALLICENCE 700 1- Dadashzadeh Gholamreza Department of Electrical Engineering, University of Shahed, Tehran, Iran aut NATIONALLICENCE 773 0- Wireless Personal Communications Springer US; http://www.springer-ny.com 68/3(2013-02-01), 1197-1223 0929-6212 68:3<1197 2013 68 11277 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer