Reliability improvement via antenna selection sensing in energy efficient spectrum access

In this paper a switch-stay model is proposed for spectrum access by a secondary user in the presence of a primary user, which considers the impact of spectrum handoff delay. This model is then studied to balance the trade-off between the secondary user´s energy efficiency and transmission reliability in light of the probability of collision, throughput and delay constraints. Bounds on the probability of stay on the current channel are derived from multiple constraints. An antenna selection sensing mechanism is then proposed to relax these bounds by enhancing the sensing performance. The advantages of the proposed antenna selection sensing are verified by numerical results.