The spectrum allocation for cognitive radio sensor networks (CRSNs) has received considerable research attention under the assumption that the spectrum environment is static. However, in practice, the spectrum environment varies over time due to primary user/secondary user (PU/SU) activity and mobility, resulting in time-varied spectrum resources. This paper studies resource allocation for chun...

This paper reviews recent work on spread spectrum network capacity. The network is shown to have a capacity that is equitably shared amongst the users via power control. This solution is much simpler than the bandwidth partitioning of the FDMA/reuse approach. The capacity gains from using spread spectrum, arising from the averaging and multiplexing, are also emphasised.

RF spectrum is a scarce resource. It is inefficient when no of users are increased. So cognitive radio is developed for provide to efficient use of bandwidth utilization. Licensed users are primary users and unlicensed users are secondary users. Cognitive radio enables the secondary usage of unused licensed spectrum band. In this Paper, we propose spectrum decision framework for best effort app...