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Novel Grassmannian beamforming techniques based on two null space broadcasting protocols are proposed for a cognitive radio network. A secondary user basestation (SBS) with multiple secondary users sharing the primary user spectrum is considered. A protocol for feeding back the channel state information (CSI) under the constraint on the availability of a finite number of bits for feedback is proposed...
Cognitive radio networks (CRNs) have the ability to utilise the radio spectrum efficiently by allowing secondary users (SUs) to communicate in the licensed frequency bands. In this study, downlink spatial multiplexing techniques are proposed to enable multiple SUs to share spectrum simultaneously without harmfully interfering the primary users (PUs). The multiuser transmitter beamformers are designed...
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