【作者】 刘云；

【导师】 文尚胜； 王红成；

【作者基本信息】 华南理工大学 ， 材料工程（专业学位）， 2019， 硕士

【摘要】 由于白光LED具有比传统照明灯具不具有的优点,如小型化、电压低、寿命长、耗能低。而较为突出的优点是响应灵敏度高、调制性能好、发射功率大,可将通信的调制信号加载到白光LED上,实现一种新的光通信技术,即可见光通信(Visible Light Communication,VLC)。VLC作为一种照明与光通信相结合的新型通信模式,而白光LED因其具有的独特优势可作为VLC的信号光源。国内外的研究大部分从底层的芯片、硬件层的均衡、软件方面的调制解调入手,很少研究信号源布局对可见光接收信号以及室内定位精度的影响。本论文主要以信号光源分布为研究对象,研究不同的分布在智能算法下,对接收性能的影响;提供不同的分布方案,研究LED信号源的分布对可见光通信定位性能的影响。主要研究内容如下:1、从可见光通信的信号源分布特性出发,研究同一接收视角在不同的信号源分布下,对接收功率、光学分布的影响。提出一种新的信号光源布局,提升室内可见光通信的信号均匀性。2、根据新的信号光源布局,采用合适的通信链路方式,研究室内可见光系统的单位面积的接收功率、信噪比、误码率等通信性能,提出一种基于杂交的混合粒子群算法对其进行优化,提升系统的性能。最终,单位面积的接收功率(the unit area received power,RPUA)波动值、信噪比(Signal to noise ratio,SNR)波动值均降低了;RPUA值在-1.5dB/m~2和-0.5 dB/m~2之间波动,在这个范围内目标布局下接收面积占93.4%,而在对比布局中,接收面积仅占86.7%。3、对于室内可见光通信,信号源布局对其定位会产生一定影响,对接收系统的接收光功率计算进行了详细的阐述;为了实现接收功率的均匀性,设计出各个模块的电路图,对电路进行仿真测试,通过采用接收强度(Received Signal Strength,RSS)三角定位算法对可见光定位系统的定位精度进行改善,平均定位精度达到了1.44cm,误差在0.5cm以下的测试点占75.6%,达到高精度定位。更多还原

【Abstract】 In comparison to traditional lamps,the LED has some advantages,such as miniaturization,low voltage,long life,low energy consumption.The outstanding advantages are high sensitivity,good modulation performance and big transmitting power,so,the white LED can be loaded the modulation signal of communication and realize a new optical communication technology,namely visible light communication(VLC).As a new communication mode combining optical communication and lighting,the LED is more suitable for the signal light source of VLC due to its advantages.Most researches study from the underlying chip,the balance of hardware layer,the modulation and demodulation of software,and seldom study the influence of signal source layout on received signal and indoor positioning accuracy at domestic and abroad.This paper mainly takes the signal light source distribution as the research object,and studies the influence of different distributions on the received performance under the intelligent algorithm.Different distribution schemes are provided to study the influence of LED signal source distribution on the positioning performance of VLC.The main research contents are as follows:1.Based on the signal source distribution characteristics of VLC,the influence of the same receiving angle on the receiving power and optical distribution under different signal source distribution is studied.A new signal light source layout is proposed to improve the signal uniformity of indoor VLC.2.According to the new signal light source layout,appropriate communication link mode is adopted to study the communication performance of indoor visible light system,such as the per unit area of received power(RPUA),signal to noise ratio(SNR),bit error rate.A hybrid particle swarm optimization algorithm based on hybridization is proposed to improve the performance of the system.Finally,the fluctuation value of RPUA and SNR are reduced.The RPUA value fluctuates between-1.5dB/m~2 and-0.5dB/m~2.During the ranges,the receiving area accounts for 93.4%in the target layout,while only 86.7%in the comparison layout.3.For indoor visible light communication,the signal source layout will have a certain impact on its positioning.Then,the calculation of received light power in the receiving system are described in detail.In order to achieve the uniformity of receiving power,the transmitting antenna that meets the conditions is designed,the circuit diagram of each module is designed,the circuit is simulated and tested,and the positioning accuracy of visible light positioning system is improved by using RSS triangulation algorithm,the average positioning accuracy reached 1.44cm,and the test points with an error of less than 0.5cm accounted for 75.6%,so as to achieve the purpose of high precision positioning.更多还原