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The cognitive radio MIMO Gaussian broadcast channels model is proposed, and the capacity is also studied under both the cognitive users' transmit power constraint and a set of interference power constraints at the licensed receivers. A duality technique and dirty paper coding (DPC) are used to simplify channel model where care available for both licensed and cognitive users in a spectrum sharing environment...
The capacity region of gaussian multi-input- multiple-output (MIMO) broadcast channels has been shown to be achieved by dirty paper coding (DPC). However, due to the high complexity of DPC and the infeasibility of the channel state information (CSI) at the transmitter, in this paper we focus on random beamforming with multiple beams (RB- MUX). The main advantages of RB-MUX are multiuser diversity...
In wireless ad hoc networks that do not employ code-division multiple access, medium access control (MAC) protocols are used to allocate the channel to specific transmitters and receivers, typically to the exclusion of all other users within the interference ranges of the transmitters and receivers. A few authors have proposed the use of multiuser detection (MUD) or dirty paper coding (DPC) to allow...
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