DOCSIS 3.1 upstream OFDMA channel optimization

城市地区的人们通常通过物理设备连接到互联网，该物理设备包括同轴电缆光纤和电子组件，如放大器，双工器和定向耦合器/抽头，其排列方式允许一条同轴电缆用于入站和出站流量。该工厂将用户住宅中的电缆调制解调器和电视连接到位于服务提供商现场的电缆调制解调器终端系统。整个系统，包括控制它的软件，被称为CATV网络。一个被称为DOCSIS的标准，其最新版本是3.1。控制着有线电视网络的软件和硬件结构，并规定了网络中使用的所有组件的功能。正如每个互联网用户所能想象的那样，一直存在着增加有线电视网络数据承载能力的压力。服务提供商已经通过改进其物理设备做出了回应，并且现在正在计划将数据传输格式更新为OFDM/OFDMA，这是DOCSIS 3.1现在允许的最先进的格式。为OFDM/OFDMA传输选择最大化数据吞吐量的参数并不是一项简单的任务。最优参数是物理设备的大小和形状、物理设备中的损伤以及交通统计的复杂函数。为了维持最大的吞吐量，CATV设备必须在几乎全新的条件下持续维护。主动式网络管理策略的难点在于，当网络组件仍在运行时，要识别出这些网络组件，这些网络组件开始降级，但尚未降级到造成吞吐量显著损失的程度。本申请中概述的项目有两个目标：1）开发其功能是确定DOCSIS 3.1 OFDM/OFDMA系统的最佳设置的算法，以及2）研究CATV组件的特性，以预测组件何时开始退化。

People in urban areas are usually connected to the internet via physical plant consisting of coaxial cable optical fibre and electronic components such as amplifiers, diplexers and directional couplers/taps arranged in such a way as to allow one coaxial cable to be used for both inbound and outbound traffic. This plant connects cable modems and TVs in a subscriber's residence to a cable modem termination system located on the service provider's site. The entire system, including the software that controls it, is referred to as the CATV network. A standard known as DOCSIS, the latest version of which is 3.1., controls the structure of both the software and hardware of the CATV network and specifies the functionality of all the components used in the network.As every internet user can imagine, there has been continuous pressure to increase the data-carrying capacity of CATV networks. Service providers have responded by making improvements to their physical plant and are now planning to update the data transmission format to OFDM/OFDMA, which is a state-of-the-art format that is now allowed under DOCSIS 3.1. Choosing the parameters for OFDM/OFDMA transmission that maximize the data through-put is not a simple task. The optimum parameters are complicated functions of the size and shape of the physical plant, the impairments in the physical plant as well as the statistics of the traffic. To sustain maximum through-put the CATV plants must be continually maintained in nearly new condition. The difficulty in a proactive network management strategy is to identify the network components, while still in operation, that are beginning to degrade, but have not yet degraded to a point where they cause significant loss of through-put.The project outlined in this application has two objectives: 1) To develop algorithms whose function is to determine the optimum settings for a DOCSIS 3.1 OFDM/OFDMA system and 2) To investigate the characteristics of CATV components that predict when the components are beginning to degrade.