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In this paper, we investigate resource allocation for a multi-user OFDMA cooperative system. Aiming at minimizing the total transmission power under target rate constraints for each user, we propose centralized and decentralized subchannel, bit, and power allocation schemes. First, assuming knowledge of the instantaneous channel gains for all links in the entire network, centralized resource allocation...
Several preceding techniques have been proposed to spatially multiplex users in the downlink of multiuser MIMO systems. These techniques are computationally complex and require that channel state information (CSI) of all users is available at the base station (BS). In this paper, we propose a random preceding technique that needs only limited feedback from the mobile stations to the BS. We investigate...
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