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Many cooperative spectrum sensing schemes in cognitive radio networks have been proposed. However, aggregation node selection was rarely considered which can improve the performance of cooperative spectrum sensing. We consider a cognitive radio network consisting of a primary user and multiple cognitive users. One of the cognitive users will be selected as the aggregation node which directly receives...
In this paper, a spectrum sharing cognitive radio(CR) multiple input and single output (MISO) system is considered, which consists of a secondary user (SU) having multiple transmit antennas and a single receive antenna and a primary user (PU) have a single receive antenna. The channel state information (CSI) on the link between SU and PU is assumed to be perfectly known at the SU transmitter (SU-Tx)...
This paper investigates the sum rate capacity of MIMO broadcast channels (MIMO-BCs) in cognitive radio (CR) networks. An efficient algorithm is proposed for selecting a set of users to achieve a high sum rate capacity of the system. With the above algorithm, the sum rate capacity of MIMO-BCs in CR networks with average interference power constraints and transmit power constraints is derived. We formulate...
Cognitive Radio (CR) has attracted much attention for its ability allowing secondary users (SUs) to share the spectrum with licensed users (PUs). The precondition that PUs bear the coexistence of SUs is that the interference caused by SUs should be under a given threshold. Therefore the main challenge of CR is interference control or even interference cancellation. In this work we employ zero-forcing...
Ultra wideband system (1MB) is characteristic of the wide bandwidth, and it, may cause some harmful interference to existing users of the same and nearby bands. So it is impending for us to research on the spectrum management and usage of UWB system aiming at the way it using spectrum as early as possible. In this paper, we are presenting a new method for UWB system to share spectrum with other wireless...
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