Absnoci-In this paper, a n o dimenriond spreading technique for multi-antenna and multi-user OFDM systems employing joint detection is presented. I n contrast to state of the ~l f spreading techniques for OFDM systems in which typically only spreading along the frequency domain i 5 performed, areording to the scheme pmpored, spreading of the user information tnLm place along the frequency m d time domain. I n this way, bo^ frequency llnd time diversity inherent in che w i r e l a channel can be exploited. Moreover, the combination of L e spreading scheme proposed with joint detection yields stimam free of multiple PPCSE interference at the o q u t of the detector.
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