Channel Allocation in Cognitive Radio Networks(CRNs)
- سال انتشار: 1395
- محل انتشار: چهارمین کنفرانس بین المللی علوم و مهندسی
- کد COI اختصاصی: ICESCON04_047
- زبان مقاله: انگلیسی
- تعداد مشاهده: 421
نویسندگان
Islamic Azad University
چکیده
Cognitive radio networks (CRNs) involve extensive exchange of control messages, which are used to coordinate critical network functions such as distributed spectrum sensing, medium access, and routing, to name a few. Typically, control messages are broadcasted on a preassigned common control channel, which can be realized as a separate frequency band in multichannel systems, a given time slot in TDMA systems, or a frequency hopping sequence (or CDMA code) in spread spectrum systemsThe implementation of a common control channel is one of the most challenging issues in cognitive radio networks, since a fully reliable control channel cannot be created without reserving bandwidth specifically for this purpose. In this paper, we investigate a promising solution that exploits the Ultra Wide Band (UWB) technology to let cognitive radio nodes discover each other and exchange control information for establishing a communication link. The contribution of this paper is threefold: (i) we define the communication protocol needed to let cognitive radio nodes discover each other and exchange control information for link set up, (ii) we overcome the gap in coverage, which typically exists between UWB and long‐medium range technolo‐ gies, by using multi‐hop communications, (iii) we evaluate the performance of our approach and show its feasibility through extensive simulations.کلیدواژه ها
Ultra Wide Band, cognitive radio, control channel assignmentمقالات مرتبط جدید
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