naa a22 4500 510793029 CHVBK 20180411083326.0 cr unu---uuuuu 180411e20130701xx s 000 0 eng 10.1007/s11277-012-0891-0 doi (NATIONALLICENCE)springer-10.1007/s11277-012-0891-0 SAGE Algorithm for Semi-Blind Channel Estimation and Symbol Detection for STBC MIMO OFDM Systems [Elektronische Daten] [Mohsen Hedayati, Hamidreza Bakhshi, Mehdi Cheraghi] In this paper, a novel semi-blind channel estimation and symbol detection based on space-alternating generalized expectation-maximization (SAGE) algorithm are proposed for space time block coded (STBC) multiple input multiple output orthogonal frequency division multiplexing (MIMO-OFDM) systems. At the receiver, the transmitted signals of all users are added. By utilization of SAGE algorithm, this superimposed received signals are decomposed into their signal components. Then, the channel is estimated at pilot positions. After that, the channel estimation in the other positions are obtained by interpolation and symbol detection is done by utilizing the estimated channel. In SAGE algorithm, selection of initial value is very important for the convergence. We discuss the appropriate range for selection of initial value in this paper. Simulation results show that by increasing the number of users, the slope of bit error rate curve increases with same initial value and the channel estimation becomes worse by increasing the iteration of SAGE algorithm if the initial value is not selected in the proposed rang. Springer Science+Business Media New York, 2012 SAGE nationallicence MIMO-OFDM nationallicence Space time block code nationallicence Semi-blind channel estimation nationallicence Hedayati Mohsen Department of Electrical Engineering, Shahed University, Tehran, Iran aut Bakhshi Hamidreza Department of Electrical Engineering, Shahed University, Tehran, Iran aut Cheraghi Mehdi Department of Electrical Engineering, Shahed University, Tehran, Iran aut Wireless Personal Communications Springer US; http://www.springer-ny.com 71/2(2013-07-01), 1541-1555 0929-6212 71:2<1541 2013 71 11277 https://doi.org/10.1007/s11277-012-0891-0 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11277-012-0891-0 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Hedayati Mohsen Department of Electrical Engineering, Shahed University, Tehran, Iran aut NATIONALLICENCE 700 1- Bakhshi Hamidreza Department of Electrical Engineering, Shahed University, Tehran, Iran aut NATIONALLICENCE 700 1- Cheraghi Mehdi Department of Electrical Engineering, Shahed University, Tehran, Iran aut NATIONALLICENCE 773 0- Wireless Personal Communications Springer US; http://www.springer-ny.com 71/2(2013-07-01), 1541-1555 0929-6212 71:2<1541 2013 71 11277 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer