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In this paper, channel assignment in cooperative spectrum sensing is studied for multi-channel cognitive radio networks. Based on the information from each secondary user, e.g., primary signal-to-noise ratios over all channels, a centralized scheme is proposed, which assigns channels to different secondary users for sensing so that the number of available channels, which meet the sensing performance...
In this paper, a distributed cooperative multi-channel spectrum sensing scheme is proposed for the non-infrastructure based cognitive radio networks. The proposed scheme has iterative property and is carried out round-by-round. In each round, each secondary user selects a few primary channels as the candidates for sensing based on primary signal-to-noise ratio. Then, the users with the same selected...
In this paper, a novel spectrum sensing scheme, called receiver-aided spectrum sensing scheme with spatial differentiation (RaSSSD), is proposed for orthogonal frequency division multiplexing (OFDM) based cognitive radio networks. In RaSSSD, the deployed area of secondary users (SUs) is divided into two sub-areas. By determining which sub-area secondary user transmitter (SUT) and secondary user receiver...
In this paper, two novel distributed routing schemes, named adaptive-information-moving-rate routing scheme (AIMR) and adaptive-information-moving-distance-and-link-rate routing scheme (AIMDLR), are proposed for multi-hop wireless networks by jointly considering the number of hops and the link states. With one-hop information only, both schemes aim at improving the network spectral efficiency under...
In this paper, a new four-antenna based structure (FAS) is introduced for capacity improvement in future cellular networks with frequency reuse factor of 1. In FAS, each cell consists of one omni-directional antenna located at the cell center and three 120-degree directional antennas located at the cell edge. In order to achieve effective system bandwidth allocation among four antennas, novel spectrum...
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