This paper focuses on MIMO multiple access channels with frequency-selective fading (spatially correlated at the receiver) assuming perfect channel state information (CSI) in the multiple antenna receiver and no channel knowledge at the multiple antenna transmitters. Each of the users employs orthogonal frequency division multiplexing (OFDM). The paper considers a multiple access scheme, which implements a variable amount of user collision in frequency (signal space) by assigning subsets of the available OFDM tones to different users.
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