naa a22 4500 51079162X CHVBK 20180411083321.0 cr unu---uuuuu 180411e20130701xx s 000 0 eng 10.1007/s11277-012-0826-9 doi (NATIONALLICENCE)springer-10.1007/s11277-012-0826-9 A Low Complexity Resource Allocation Method for OFDMA System Based on Channel Gain [Elektronische Daten] [Mohsen Ashourian, Razieh Salimian, Homayoun Nasab] In orthogonal frequency division with multiple access (OFDMA) systems dynamic radio resource allocation improves overall performance by exploiting the multiuser diversity gains. A key issue in OFDMA is the allocation of the OFDM subcarriers and power among users sharing the channel. This paper proposes a new rate adaptive resource allocation scheme in the OFDMA downlink transmission system. Our proposed algorithm is based on the users' sensitivity to the subcarrier allocation which means how frequency selective is the channel from the user's perspective. As a result of frequency selectivity of the channel, different subchannels of the same user experience different levels of fade. However, how different they undergo fading could be measured by difference between maximum and minimum channel gain of that user. Our proposed method is based on difference between maximum channel gain and minimum channel gain for each user and uniform distribution of power among subcarriers. Simulation results show that the proposed algorithm achieves higher capacity over fixed TDMA method, and reported suboptimal methods with acceptable rate proportionality. Springer Science+Business Media, LLC., 2012 Adaptive resource allocation nationallicence OFDMA nationallicence Multiuser diversity nationallicence Multiple access nationallicence Resource allocation nationallicence Ashourian Mohsen Department of Electrical Engineering, Majlesi Branch, Islamic Azad University, Isfahan, Iran aut Salimian Razieh Department of Electrical Engineering, Majlesi Branch, Islamic Azad University, Isfahan, Iran aut Nasab Homayoun Department of Electrical Engineering, Faculty of Engineering, Najafabad Branch, Islamic Azad University, Isfahan, Iran aut Wireless Personal Communications Springer US; http://www.springer-ny.com 71/1(2013-07-01), 519-529 0929-6212 71:1<519 2013 71 11277 https://doi.org/10.1007/s11277-012-0826-9 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11277-012-0826-9 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Ashourian Mohsen Department of Electrical Engineering, Majlesi Branch, Islamic Azad University, Isfahan, Iran aut NATIONALLICENCE 700 1- Salimian Razieh Department of Electrical Engineering, Majlesi Branch, Islamic Azad University, Isfahan, Iran aut NATIONALLICENCE 700 1- Nasab Homayoun Department of Electrical Engineering, Faculty of Engineering, Najafabad Branch, Islamic Azad University, Isfahan, Iran aut NATIONALLICENCE 773 0- Wireless Personal Communications Springer US; http://www.springer-ny.com 71/1(2013-07-01), 519-529 0929-6212 71:1<519 2013 71 11277 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer