Cognitive Radio Home
Due to the rapidly increasing demands of wireless bandwidth, available spectral resources become scarce. Moreover, current fixed spectral allocation suffers from underutilization as in the case of TV bands. These are the motivations of Cognitive Radio (CR) network, which is defined as a radio that makes secondary users actively search for the idle channels NOT used by the primary users by scanning the whole spectrum. Our current research mainly focuses on channel modeling, search algorithm analysis and channel detection in CR network. Currently for CR, we are investigating the following:
- We are studying efficient dynamic spectrum access strategies using Markov Chain and Queuing Theory. The adaptive strategy of scanning for spectral opportunities in a dynamic scenario, where the usage pattern of primary users change is also included in potential directions to extend our work. The modelling of channel state information using correlated Markov model is expected to be utilized to design such a strategy.
For heterogeneous networks:
- Efficient vertical hand-off strategies between various networks to support user QoS requirements