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IEEE 802.22 wireless regional area network (WRAN) is an emerging cognitive radio-based system. One of the major challenges for WRANs is how to efficiently schedule both channel sensing and data transmission for multiple adjacent WRAN cells. This challenge is known as coexistence problem. In this paper, we propose four schemes that aim at reducing the coexistence-problem effect. These schemes are based...
IEEE 802.22 is the first worldwide wireless standard based on Cognitive Radio (CR) for Wireless Regional Area Networks (WRAN). Usually, Secondary Users (SUs) have to be interrupted periodically for spectrum sensing so as to avoid interference to Primary Users (PUs) operating in the licensed bands. Such interruptions of data transmission, however, impair the Quality of Service (QoS) of SUs. Dynamic...
IEEE 802.16j is the standard that enjoys the most attention at present. By deploying Relay Stations (RS) in appropriate locations to enhance the throughput of the IEEE 802.16 users, and by expanding the coverage range of the wireless communications, it utilizes relaying technology to reach a uniform transfer data rate. When we use the multi-hop to transmit data on Relay Path, as the number of hop...
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