Energy Efficiency Optimization Research For Wireless Information And Power Transfer System In Multiple Antenna System

Along with popularization of wireless communication technology in People’s Daily life, limited resources in communication system have been unable to meet user requirements, starting to affect the work efficiency of the system. Under high QOS(Quality of Service) requirements and minimum information transmitting rate, reducing energy consumption of the system link and improving the system efficiency all require a highly efficient resource allocation scheme for us now. The existing resource allocation algorithm is more committed to improve the system throughput and little literature study system efficiency. In order to improve system efficiency, this article research the resource allocation algorithm which is high efficiency and energy saving on multiple antennas WIPT(Wireless Information Power Transfer) system, the main contents are as follows.First of all, for the single user and multiple antennas WIPT system, base station energy Beamforming is introduced to improve the utilization rate of power. Put forward a effective antenna selection Algorithm IBSA(Improved Binary Search Algorithm), this Algorithm can quickly achieve the number of antenna to find the optimal system energy efficiency. Through the analysis and prove that the closed expression of energy efficiency was pushed out, while put forward an energy efficiency optimization problem. Using the KKT(Karush Kuhn Tucker) conditions and the Lagrangian dual function solve the optimal solution of power and transfer time.Secondly, for the single user and multiple antennas WIPT system, introduced the energy collection technology which use Markov Chain(Markov Chain) simulation on battery charge and discharge process. Put forward a GS(Greedy Switching) strategy, through the strategy analysis to achieve optimal system efficiency and the interrupt probability of expression. In addition, on the premise of ensure the QOS, combined with using the antenna selection to achieve the effect of improve energy efficiency.Finally, in view of the multiple antennas WIPT system which extends the single user to multiple users, puts forward an efficient resource allocation scheme, the scheme considering multiple users access problems. Due to the communication between Base Station and users in system is influenced by the number of antennas in Base Station, so the points discussed and raises the antenna selection and user selection algorithm, and puts forward the detailed process. In addition, introducing a resource allocation algorithm of optimized transmission power and transfer time, the algorithm adopts the KKT conditions and dual decomposition.