Research On Simultaneous Wireless Information And Power Transfer Technology

In recent years,with the rapid development of information and communication technologies,various wireless devices have come into people's eyes more and more.The short-distance communication represented by wireless sensor networks has ushered in the climax of research in recent years,and it has broad prospects for development in smart cities,smart homes,driverless and embedded medical fields.However,wireless sensor networks often face energy-constrained situations.Sensor terminals are generally installed in difficult-to-reach environments.When sensor energy is exhausted,replacing a new battery is cumbersome or impossible,which means that these sensors the end of the lifespan of the wireless sensor network.The use of wireless energy transmission for energy collection is an important solution to solve the problem of wireless network energy.The wireless energy collection and information simultaneous transmission system has improved the electromagnetic energy utilization efficiency on the basis of traditional communication principles,and has provided users with a permanent and stable energy supply to a certain extent.Therefore,rapid development has become a hot topic in recent years.Research areas.The overall goal of this paper is to design the overall architecture of the wireless information and energy simultaneous transmission system,and to focus on the data throughput maximization algorithm under the condition that the wireless information and energy simultaneous transmission system satisfy the user's minimum energy collection threshold constraints.The specific research content and major contributions are as follows:The first part introduces the design of wireless information and energy transmission system based on wireless sensor network.Firstly,the narrow-band multi-input single-output system model is introduced.Based on the assumption that the receiver can perform information demodulation and energy acquisition at the same time,the upper bound of the performance of the narrow-band multiple-input single-output system is deduced.Finally,the receiver architecture of the wireless information and energy simultaneous transmission system is classified and discussed.The basic structure and principle of the two power receivers and time division receivers are compared and analyzed.The second part proposes an efficient resource allocation algorithm for wireless information and energy simultaneous transmission system based on subcarrier allocation.The algorithm starts from the objective function and fits the direction of satisfying the energy constraint on the premise of always satisfying the maximization of the current objective function.When all the users satisfy the energy constraint,the allocation of the allocation algorithm ends.This allocation algorithm is based on the guarantee of the throughput index,but also has the characteristics of low complexity and high efficiency.The third part proposes an efficient resource allocation algorithm for wireless information and energy simultaneous transmission system based on joint allocation of subcarriers and power.The system model includes a transmitting base station and a multi-user receiver.The base station uses an omnidirectional antenna transmission mode.The energy acquisition module adopts an omnidirectional energy acquisition mode.The information receiving module also adopts an omnidirectional reception mode(decoding information data on all subcarriers).The base station transmits using the power allocation mode,the transmission power on each subcarrier is different,and each time slot can send information to only one user,and other users in the time slot perform energy acquisition.This algorithm converts non-convex problems that are difficult to directly solve into convex problems for the system model and then solves the Lagrangian duality method in convex optimization theory,which achieves better system performance.