Research On Transmission Strategies Of SWIPT In Cooperative Communication

In recent years,the field of wireless data has developed rapidly,such as wireless devices or wireless sensor nodes,which consume large amounts of battery energy.As for energy-constrained nodes,there is an urgent problem to be solved that insufficient energy affects the life cycle.There are many green communication technologies have been proposed.Therefore,simultaneous wireless information and power transfer has emerged at the historic moment.It adopts energy collection technology and uses radio frequency signal to get energy.To solve the problem of insufficient sensor node energy.Energy harvesting is also one of the hot research directions in recent years,and it has a wide range of applications.SWIPT divides the signal into two parts: energy part and information part,which effectively improves the transmission efficiency.However,in order to achieve better performance and maximize the throughput of wireless energycarrying networks,the resource allocation schemes and transmission modes are still worthy of research.This paper studies the above problems,designs two transmission protocols that based on wireless energy-carrying networks and relay selection strategies.Then formulates effective transmission schemes,which improves system performance significantly.The specific research work is as follows:First,the architecture and application scenarios of the SWIPT technology are studied.With the challenge of SWIPT as the background,the significance of resource allocation is explored,and a system model is established.Secondly,this paper designs a direct transmission method.According to the current channel state,it dynamically adjusts the energy collection time within a cycle.And then uses the collected energy for information transmission.The throughput efficiency expression of the transmission protocol is derived and the corresponding analysis is given.Under different parameters,the performance of transmission is verified by simulation.Thirdly,in order to solve the problem which direct link was failed,the relay transmission method is designed.Optimize the existing transmission mode.To achieve efficient communication mode under cooperative communication,and adopt the power allocation PS method for energy acquisition and information transmission.Under the continuous time,the transmission time of the two phases adopts a dynamic change in a cycle.This adaptive strategy effectively improves the system throughput.Compare and observe the results by MATLAB simulation.Finally,the relay selection improve the performance of the wireless relay network by utilizing the spatial diversity among the distributed single antenna terminals.Relays are used to assist in transmitting information between the nodes,which expands the communication transmission range and achieves a more efficient communication method.Based on the proposed relay transmission scenario,a multi-relay selection model under power allocation in wireless energy carrying networks is established.Based on the amplification and forwarding method,two relay selection transmission strategies are designed,namely the improved maximum energy collection method and the improved maximum signal-to-noise ratio transmission method.The performance of the two transmission protocols are proved by MATLAB simulation.And observe the performance of the number of relays affect the entire system.