室内光通信系统组网技术研究

发布时间：2018-03-08 10:46

本文选题：可见光通信　切入点：组网　出处：《东南大学》2015年硕士论文　论文类型：学位论文

【摘要】：近年来,无线通信的发展受到了诸多的限制,如频谱资源的匮缺,射频对人体的辐射危害等。而随着发光二极管(LED)技术的不断发展和在现代家庭中的不断应用,与之对应的使用LED灯进行数据传输的室内可见光通信技术也受到了极大的关注,并被进行了大量的深入研究。可见光通信技术具有频谱资源丰富,绿色安全,能量转化率高等诸多优点,对于实现室内高速绿色通信具有重要的研究价值。本文主要着眼于室内可见光通信系统中的组网技术,解决典型室内灯组组网下多用户的高效通信问题。首先,本文介绍了可见光通信及其组网技术的研究背景和研究进展,以及可见光通信系统中的基础理论。自从提出可见光通信的概念,可见光通信的研究就在全球各地广泛开展,但是目前研究较多的仍然是可见光通信的物理层技术领域,以获得更高的信息传输速率作为目标。本文则着重介绍了可见光通信在组网技术方面的一些理论研究成果,并讨论了可见光通信系统中的链路方式,信道建模等内容。此外,本文还阐述了可见光通信在组网方面可能会遇到的一些技术问题。其次,本文对可见光通信系统中LED灯组的最优化布局问题进行了研究。对于该问题,本文并不是单纯地考虑覆盖的均匀度,而是以光照强度和光接收功率的均匀度作为一个目标,以接收平面的平均光接收功率值作为另一个目标,将其他条件作为约束,建立起一个多目标的最优化模型,并通过将该多目标最优化模型转变为单目标最优化模型进行了求解。仿真结果表明,本模型可以通过合理地配置模型权重系数,以满足灯组布局的不同需求,并给出了对应需求下的光照强度分布和光接收功率分布图。接着,本文研究了分布式灯组架构下的灯组调度问题。分布式灯组指每个灯组相当于一根天线,呈分布式分散在房间中。所有灯组都连接在一个调度器上,受该调度器统一控制。在该架构下,本文提出了一种基于用户运动方向的灯组协同调度算法。该算法在灯组和用户进行数据通信时,测量用户的上行功率,利用一段时间内接收到的功率信息,获得用户相对于各灯组的运动方向。利用该方向信息,将灯组分为用户前进方向灯组集和用户远离方向灯组集,在对用户前进方向灯组集进行强度补偿后,再进行灯组的调度,从而保证用户在室内移动时的可靠通信。仿真结果表明,该灯组调度方法在数据重传方面的表现显著优于不使用灯组协作的调度算法和简单的灯组协同调度算法,可以满足系统对可靠通信的要求。最后,本文还研究了独立式灯组架构下的灯组调度问题。独立式灯组则意味着每个灯组都具有控制功能,其天线在同一位置,灯组可以独立控制发送数据。同样在该架构下,本文提出了一种增量式的灯组调度算法。该增量式的灯组调度算法可以分为两个部分,即长周期的全局调度和短周期的局部调度。其中全局调度是针对所有的用户,以整体的系统容量为目标,将所有的用户划分在多个时隙中,确保每个时隙中的用户之间没有干扰。而低复杂度的局部调度则是跟踪移动用户的运动,并调整之前产生的灯组调度结果以适应用户的移动。仿真结果表明,该增量式灯组调度算法对于多用户移动的场景,可以在获得高系统容量的同时,显著降低了系统的调度复杂度。
[Abstract]:In recent years, the development of wireless communication has many limitations, such as spectrum resource scarcity, RF radiation on the human body harm. And with the light emitting diode (LED) the development of technology and continuous application in the modern family, the indoor visible light communication technology to use the LED lamp and the corresponding data transmission it has been of great concern, and was deeply studied. A large number of visible light communication technology has rich spectrum resources, green safety, energy conversion rate is higher for many advantages, it has important research value to achieve high-speed indoor green communication network technology. This paper mainly focuses on indoor visible light communication system, efficient communication the problem of multiple users of typical indoor lamp group network. Firstly, the paper introduces the development of visible light communication and networking technology research background and research, as well as visible light communication system. Basic theory. Since the concept of visible light communication, to carry out extensive research on visible light communication in the world, but the study is still more physical layer technology in the field of visible light communication, in order to obtain higher transmission rate as the goal. This article emphatically introduces the visible light communication in the network technology some research results of the theory, and discusses the link of visible light communication system, channel modeling and so on. In addition, this paper also introduces some technical problems may be encountered in the visible light communication network. Secondly, this paper studied the optimal layout problem of LED lamp group in visible light communication system for. This problem, this paper not only consider the coverage uniformity, but by the light intensity and the light receiving power uniformity as a goal, to receive the average received power of the light plane As another target, the other conditions as constraints, establish a multi-objective optimization model, and through the multi-objective optimization to solve the model into a single objective optimization model. The simulation results show that this model can reasonably model the weight coefficient, to meet the different needs of the layout of the lamp group, and gives the corresponding demand under the light intensity distribution and the optical receiving power distribution. Then, in this paper the lamp group scheduling problem in distributed light group under the framework of distributed. Each lamp lamp group refers to the group is equivalent to an antenna, is distributed in the room. All the lamps are connected in a scheduler and under the unified control of the scheduler. In this framework, this paper proposes a user based on the direction of movement of light group collaborative scheduling algorithm. The algorithm of data communication in the light group and the user, the user's measurement For power, the power of information using a period of time to the reception of the user relative to the motion direction of each lamp group. Using the direction information, the lamp group is divided into user direction lamp group set and user group set in the direction away from the lamp, the user group set the direction of light intensity compensation, then light group scheduling, so as to ensure the reliable communication of users in indoor mobile. The simulation results show that the scheduling algorithm of the lamp group scheduling method in data retransmission's performance is significantly better than using the lamp group collaboration and simple light group collaborative scheduling algorithm can meet the requirements of reliable communication system. Finally, this paper also study on the group scheduling problem of independent type lamp lamp group architecture. Independent lamp group means each lamp group has control function, the antenna in the same position, lamps can be controlled independently to send data. Also in the framework of this paper. The lamp group scheduling algorithm is an incremental scheduling algorithm. The incremental lamp group can be divided into two parts, namely the local scheduling of global scheduling long period and short period. The global scheduling is for all users, the overall system capacity as the goal, all users are divided in multiple time slots in each time slot to ensure there is no interference between the users. And the low complexity of local scheduling is tracking mobile user's movement, lamp group scheduling results and adjustment before to adapt to mobile users. The simulation results show that the incremental light group scheduling algorithm for multiple users of the mobile scene, can obtain the high system capacity at the same time, significantly reduce the scheduling complexity.

【学位授予单位】：东南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN929.1

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