Main Article Content
Abstract
In this paper, we investigate the impact of secondary user’s mobility on system throughput for cognitive radio users. In a cognitive radio network, system performance is greatly influenced by selection of decision threshold (γth) and it is selected based on the tradeoffs between probability of missed detection and probability of false alarm. A general criterion to select the constant value of decision threshold based on fixed low value of probability of false alarm, in order to avoid underutilization of frequency spectrum. In this paper, we propose adaptive selection of γth, computed as a function of physical separation between primary and secondary receiver. The analysis shows how variable γth affects system throughput. Further, we consider the case of mobile user to show the impact of CR user’s mobility on the system throughput.