Research On The Power Allocation Scheme Under The Coexistence Network Of Cellular Network And Device-to-device Communication

The D2D communication technology proposed by the 3rd generation mobile communication partner project 3GPP is a point-to-point communication method based on LTE system communication.It can use the commercial frequency resources of LTE system and other non-commercial frequency resources to communicate,and the communication process can communicate directly between equipment and equipment without using the central base station.In addition,it is a research hot spot to introduce relay to expand the coverage of base station,reduce the load of base station and prolong the battery life of the base station.This article focuses on two-way relay of power allocation in cellular networks,based on the D2 D two-way relay precoding power allocation and relay and D2 D communication network based on movement model of base station power control strategy under the background of the problem.In order to maximize the network throughput,this paper first designed the power allocation factor in two-way relay end,on the premise of guarantee the quality of the user communication,the inconsistency of power allocation according to user's channel.Through system level simulation and verification,the throughput performance has improved under the same signal to noise ratio.In order to improve the communication quality of D2 D users in the D2 D communication network,the power allocation problem of the two-way relay terminal is combined.Then,this paper presents a power distribution scheme to minimize D2 D client MSE in D2 D communication network with two-way relay.In the first time-slot,the D2 D user sends the end precoding and uses CVX to solve the quadratic programming problem,minimizing the MSE in the two-way relay receiver.During the second time-slot,the Two-Way relay uses the power allocation factor to forward communication signals to D2 D users and minimize MSE at the D2 D user receiver.The simulation results show that the power distribution scheme proposed in this paper is better than the mean square error of the random power allocation schemeof other schemes in the receiver.Finally,the dynamic problem of the user in the communication network is solved in the practical application.Based on the power control of the base station,theinfluence of the speed of the user's motion is taken into account,and the optimization problem that maximizes the network throughput is given.The constraint conditions of the power of base station and the power of relay,and the threshold constraint condition of each user to the SNR.Through the control of the launch power of the base station,the whole network can solve the optimization problem by ensuring the user's communication quality,realizing the maximum throughput of the network and giving the simulation verification.