Research On Relay Pre-selection And Resource Allocation For Energy Harvesting Wireless Sensor Networks

Owing to the limited amount of energy,the performance and applications of the pure batteries-powered wireless sensor networks(WSNs)were constrained.Energy harvesting(EH)has recently emerged as a promising method for green communication as it can power WSNs systems using renewable energy.The relay pre-selection schemes is developed to which can complement more practicability than the conventional relay selection method.This investigates the use of threshold relay pre-selection to prolong the lifetime,focusing on efficient utilization of available channel state information and energy state information.To improve the performance of information transmission stability,the relay pre-selection schemes as an adaptive energy threshold were proposed.Using the hybrid scheme of maximum harvested energy and maximum signal-to-noise ratio,the problem of the overuse of relay and channel mismatch has been solved.In this investigate,a relay pre-selection scheme are proposed for a prolonged life and improved stability performance.According to relay pre-selection scheme,we optimized resource allocation under different transmission conditions.In addition,based on the EH-WSNs system model with throughput maximization,resource allocation is investigated.Resource allocation,which consists of time switching and power transmission,is optimized for the EH period.By employing the subgradient algorithm,the resource allocation scheme is proposed under the above three relay pre-selection scheme which can maximum end-to-end throughput by jointly optimizing the power and time switching factor.Furthermore,the dissertation presents the optimal resource allocation for achieving a desirable tradeoff between EH time and energy consumption time.The proposed resource allocation scheme with relay pre-selection can further increase end-to-end throughput.Numerical results show the stable performance of the proposed relay pre-selection scheme,which achieves prolonged lifetime and greatly enhanced stability.Moreover,there is a satisfactory performance of resource allocation in terms of significantly increased throughput.