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Subspace\u2010based blind channel estimation is proposed by considering a QO\u2010STBC scheme that involves four transmit antennas and multiple receive antennas. Based on the first\u2010order perturbation theory, the mean square error of the channel estimation is derived. With the estimated channel coefficients, we employ minimum output energy and eigenspace receivers for symbol detection. Using the QO\u2010STBC coding property, the weight analyses are performed to reduce the computational complexity of the system. In addition, the forward\u2013backward averaging technique is presented to enhance the performance of multiuser detection. Numerical simulations are given to demonstrate the superiority of the proposed channel estimation methods and symbol detection techniques. Copyright \u00a9 2011 John Wiley &amp; Sons, Ltd.<\/jats:p>","DOI":"10.1002\/dac.1241","type":"journal-article","created":{"date-parts":[[2011,2,26]],"date-time":"2011-02-26T15:26:28Z","timestamp":1298733988000},"page":"294-313","source":"Crossref","is-referenced-by-count":19,"title":["MC\u2010CDMA MIMO systems with quasi\u2010orthogonal space\u2013time block codes: Channel estimation and multiuser detection"],"prefix":"10.1002","volume":"25","author":[{"given":"Jung\u2010Lang","family":"Yu","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Chun\u2010Hsien","family":"Wu","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ming\u2010Feng","family":"Lee","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2011,2,24]]},"reference":[{"key":"e_1_2_11_2_2","volume-title":"Multicarrier Techniques for 4G 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