Additional Band width Design with Adaptive Orthogonal Frequency Division multiplexing
Journal Title: International Journal of Advanced Research in Computer Engineering & Technology(IJARCET) - Year 2012, Vol 1, Issue 7
Abstract
With the advent of new high data rate wireless applications, as well as growth of existing wireless services, demand for additional band width is rapidly increasing. A cognitive radio (CR) node is a radio device capable of operating over multiple channels. As a result, a network consisting of one or more CR nodes can adapt to varying channel availability in its geographical region by dynamically changing the channel (or channels) that nodes use for communication. We investigate the problem of neighbor discovery in a network consisting of one or more CR nodes when nodes have multiple receivers but only single transmitter. Neighbor discovery, in turn can be used to solve other important communication problems such as broadcasting and gossiping in an efficient manner . we present an OFDMA – based deterministic distributed algorithm for neighbor discovery. An OFDMA system is considered to be suitable for the cognitive Radio base band processing . The individual carrier frequency can be switched off for an occupied user. We propose an ARM processor architecture which can be dynamically configured for the baseband usage of spectrum in identifying unused radio spectrum on the basis of observing spectrum usage. The classification of spectrum as being unused and the way it is used involves regulation,as this spectrum might be originally assigned to a licensed communication system. This secondary usage of spectrum is referred to as vertical spectrum sharing. To enable transparency to the consumer, cognitive radios provide besides cognition in radio resource management also cognition in services and applications. Cognition is illustrated at the example of flexible radio spectrum usage and the consideration of user preferences In observing the environment, the cognitive radio decides about its action. An initial switching on may lead to an immediate action, while usual operation implies a decision making based on learning from observation history and the consideration of the actual state of the environment. The Federal Communications Commission (FCC) has identified in the following (lessrevolutionary) features that cognitive radios can incorporate to enable a more efficientand flexible usage of spectrum:
Authors and Affiliations
Prof Ch. Venkata Ratnam , S. prabhu Sri Lakshmi
Keywords
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