The main objective of this book is to analyze the performance of spectrum decision schemes. In this book probability-based spectrum decision and sensing based spectrum decision schemes are compared in term of the overall system time spent by secondary user in the system. The preemptive resume priority (PRP) M/G/1 queuing model is implemented in both approaches for balancing the incoming traffic in the spectrum. Each channel in the spectrum maintains two queues one for primary user and other for low priority secondary user. The optimal number of candidate channels are calculated from the...

In the present scenario, orthogonal frequency division multiplexing (OFDM) systems are greatly utilized in recent multimedia applications and various wireless standards due to their robustness to frequency selective fading channel, high data rate achieving capability, and high spectral efficiency. The multi-input multi-output (MIMO) system in combination with OFDM has drawn significant attention for the next-generation broadband multimedia applications due to the additional potential of providing increased channel capacity. Despite these advantages, one of the major challenges faced in...