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This paper presents a performance analysis of a spectrum sharing model which based on dynamic spreading spectrum approach for cognitive radio networks. This model consists of two phases: In the first, if the sensing results show that the primary user (PU) is inactive, the secondary user (SU) can transmit data based on its own benefit. In the other hand, if the PU is active, the SU can coexist with...
In this paper, resource allocation for Orthogonal Frequency Division Multiple Access (OFDMA)-based Wireless Mesh Networks (WMNs) is investigated. First, the Even-Odd framework is modified to be better suited for different traffic patterns. Second, the scheduling problem in the modified Even-Odd framework is formulated as a Mixed Integer Quadratically Constrainted Programming (MIQCP), and a heuristic...
Multi-input multi-output (MIMO) techniques are used to provide space multiplexing and improve point-to-point link capacity in wireless communication systems, but due to the deep fading in channel gain, large noise and co-channel interference, the data packets are likely not to be recovered correctly in receiver, thus hybrid automatic repeat request (HARQ) is widely adopted to enhance the reliability...
Recently, there has been an upsurge of interest in multi-hop relay in both academia and industry. By breaking a long-distance low-quality link into two or more high-quality segments, multi-hop relay is introduced to enable traffic/signaling forwarding between base station and mobile user with the benefits of throughput enhancement and coverage extension. In this paper, we propose a novel retransmission...
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