Research On The Integration Of Indoor Visible Light Communication And Positioning

At present,with the rise of wireless communication networks and the growth of mobile terminal devices,wireless spectrum resources have depleted.However,user requirements for communication quality and location services is still increasing.The visible light system has received extensive attention because it can realize the functions of lighting,communication and positioning at the same time.However,the existing researches separate the communication and positioning,and do not discuss the integration of communication and positioning on a single system.In view of the above problems,this paper studies the integration design of visible light communication and positioning in multiple Light Emitting Diodes(Light Emitting Diode,LED)with single Photo Diode(Photo Diode,PD)scenarios and single LED with multiple PDs scenarios.The specific work are as follows:1.For multiple LEDs and a single PD scenario,the robust power distribution problem of the integration of visible light communication and positioning is studied.Firstly,at the signal design level,the communication signal and the positioning signal are designed as a frame structure.Secondly,derive the equation relationship between positioning power and CramerRao lower bound.And the connection between the positioning power and the communication power is established by the outage probability expression.Finally,the robust power allocation scheme for communication and positioning is studied.For the scenery where the positioning error follows the Gaussian distribution,Bernstein's inequality and Taylor expansion are used to approximate the probabilistic constraints in the optimization problem to convex constraints,and the optimization problem is converted into a series of convex sub-problems to solve.For the scenery where the positioning error distribution is unknown,Markov's inequality is used to deal with the non-convex constraints in the optimization problem.The simulation results show that the robust power distribution scheme achieves the requirements of rate threshold and outage probability.Compared with the non-robust scheme,the robust scheme achieves a higher communication rate.2.For single LED and multiple PDs scenarios,the robust power allocation problem of the integration of visible light communication and positioning is studied.Firstly,derive the lower bound of Cramer-Rao lower bound in a single LED with multiple PD scenarios.Secondly,the relationship between positioning power and communication power is obtained by establishing the communication rate relationship.Finally,the problem of robust power allocation for communication and positioning is studied.For the scenery where the positioning error obeys the Gaussian distribution,Bernstein's inequality and Taylor expansion are used to convert the non-convex optimization problem into a convex Semidefinite Programming(Semidefinite Programming,SDP)problem to solve.For scenery where the positioning error distribution is unknown,Markov's inequality is used to process and solve the optimization problem.The simulation results show that the robust power allocation scheme has reached the minimum communication rate requirement.And the robust scheme requires less total power for communication and positioning than the non-robust scheme.There are 27 figures,7 tables and 86 references in this thesis.