Distributed Multihop Transparent Secondary Cognitive Radio Networks
G. Roselet Sheena Merlin, A. Kanagalakshmi · SSRN Electronic Journal · 2016
Evolution of wireless communication has lead to an enormous growth of the wireless system and its services. In the last two decades, the number of wireless systems and services has grown exponentially. Due to the high demand of the users of wireless systems, the availability of prime wireless spectrum has become severely limited. According to the National Telecommunications and Information Administration’s (NTIA), only a little new bandwidth is available for the upcoming and emerging new wireless products and services as almost all frequency bands have been assigned. Because of this spectrum shortage the users coexisting in the same frequency band interfere with each other. To avoid this spectrum shortage and to utilize the spectrum efficiently the idea for Cognitive Radios (CR) was introduced. These devices utilize advanced radio and signal-processing technology. In CR there are new techniques used for spectrum-allocation purposes. In CR network the secondary network users should exist transparently without disturbing the primary network users. This is called transparent coexistence of the secondary network. Interference is caused due to the transparent coexistence of the secondary network towards the primary network. Hence, Interference Cancellation (IC) is done using channeling technique. In channeling the frequency will be slotted so that the secondary user will not cause interference to the primary network user. The probability distribution algorithm is proposed as the traffic between the nodes in the networks will be random. The system will be distributed system. By calculating the traffic, interference cancelation is done. Using probability distribution algorithm maximization of minimum throughput is achieved.