Design And Performance Analysis Of A Novel Positioning-communication Integrated Signal For 5g Positioning

Nowadays,the Location Based Service(LBS)is growing rapidly and attracting much attention.The traditional satellite positioning systems are not suitable in complicated environments,such as the urban and indoors,because of the poor signal coverage.Wi-Fi,Bluetooth and Wireless sensor networks based positioning system have a good coverage in complicated environments with dense placements of the nodes.But they usually need to establish and update the fingerprint library which limits their usages.The Cellular communication network has a well coverage both indoors and outdoors,which is an important means to achieve wide area indoor positioning.With the support of the national key research and development plan(project number:2016YFB0502001),the main research work of this thesis is divided into the following sections:1.Design and Performance Analysis of a novel positioning-communication integrated signal:The downlink version of NOMA has been standardized in 3GPP LTE Advanced,and it is one of the key candidate technologies for 5G.In order to improve the positioning accuracy of the base station without affecting the mainstream communication services,this paper will combine the respective advantages of OFDM and CDMA to design a novel positioning-communication integrated signal.2.Interference analysis:Since the system is actually a common-band system.There are the interference problems existing in the integrated signal,we analyze the impact of co-frequency interference on the different signals.In addition,we try to reduce interference and improve the performance of integrated signal.We use the bit error rate(BER)to measure the interference of the positioning signal on the communication signal,and the code phase measurement error to measure the interference of the communication signal to the positioning signal.The results show that our scheme is feasible and has better performance than the PRS signal.3.Resource allocation:Resource allocation is an effective technical solution to achieve the best overall performance of the converged system.In order to ensure the quality of communication service(Qos),and improve the positioning accuracy of the entire system as much as possible,meanwhile solving the "near-far" effect,we must carefully allocate the power of positioning users.We abstract this problem into a convex optimization problem and use the Lagrange dual method to solve the optimal power allocation strategy.The results show that our allocation strategy greatly improves the positioning accuracy and coverage performance.