Digital Distributed Antenna System (DDAS)

数字分布式天线系统（DDAS）

• 批准号: EP/J013544/1
• 负责人: Ian Hugh White
• 金额: $ 15.57万
• 依托单位: University of Cambridge
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2012
• 资助国家: 英国
• 起止时间: 2012 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=EP%2FJ013544%2F1
• 关键词: Digital; Distributed; Antenna; System; DDAS

This project will seek to commercialise research which has led to the development of a new paradigm in the distribution of wireless services. In short the targeted products will, for the first time, enable the distribution of multiple RF services over conventional internet infrastructure for the first time. It will allow full remote management and monitoring of such services, and enable a substantial increase in backhaul capacity. The concept behind this current proposal won the Cambridge University £5k Entrepreneur's Challenge in its field in 2011. To date in-building DAS systems have primarily been analogue and this results in limitations in the number of wireless channels, and hence the capacity, that can be transmitted over an individual optical fibre. If digital systems have been used, they have typically been configured for known, pre-determined, RF modulation formats and protocols, and require very high bandwidth digital links to transmit the signals. Up to now, this has been acceptable because conventional DAS systems have been used to ensure good coverage for mobile services with capacity requirements being relatively modest. However both analogue radio over fibre and conventional digital DAS have considerable limitations for likely future user needs where for the first time, capacity will become a very important issue, as it will affect the growth of high bandwidth services such as mobile video. This is because both conventional techniques essentially use large bandwidths which necessitate the use of individual back-haul fibres being required to address individual antennas. As such these systems become limited in their ability to scale to the numbers of antennas required to deliver on future bandwidth demands, and require the conversion from IP internet traffic to mobile communication standards to occur at a base station within the building from which the signals are carried on the DAS. For future systems therefore, where capacity will become as (and indeed more) important than coverage, a new technology is required. Recently we have devised a system concept able to solve this problem (even though it is able to use low bandwidth links such as twisted-pair cables), and in turn proposed how it would enable a new form of commercial model for the delivery of high bandwidth services in the future. The technology not only makes possible exploitation by hardware sales, but also offers the creation of new service models which a new companies could adopt, in effect creating the mobile service equivalent to 'cloud computing'. Thus this digital DAS (DDAS) project aims to develop a novel DAS which could take advantage of existing Ethernet infrastructure in such places to make them economically feasible to install. In addition, it offers a more flexible way of increasing capacity since the radio source is centralised. It intends to take the current laboratory demonstration of the low bit rate digital DAS system to commercialisation. The technical aspect of the work will focus on a prototype system to demonstrate to potential customers, investors or collaborators. The commercial development plan will develop relationships with customers and potential licensees while building a business plan with the aim of generating a spinout company at the end of the grant period.

该项目将寻求将导致无线服务分配新模式发展的研究商业化。简而言之，目标产品将首次实现在传统互联网基础设施上分配多种RF服务。它将允许对这些服务进行全面的远程管理和监控，并使回程容量大幅增加。目前这一提议背后的概念在2011年赢得了剑桥大学5000英镑的企业家挑战赛。迄今为止，建筑物内DAS系统主要是模拟的，这导致无线信道数量的限制，因此限制了可以通过单独光纤传输的容量。如果已经使用数字系统，则它们通常已经被配置用于已知的、预定的RF调制格式和协议，并且需要非常高带宽的数字链路来传输信号。到目前为止，这是可以接受的，因为传统的DAS系统已经用于确保移动的服务的良好覆盖，其中容量要求相对适中。然而，光纤上的模拟无线电和传统的数字DAS对于可能的未来用户需求具有相当大的限制，其中容量将首次成为非常重要的问题，因为它将影响高带宽服务（例如移动的视频）的增长。这是因为这两种传统技术基本上都使用大带宽，这使得需要使用单独的回程光纤来寻址单独的天线。因此，这些系统在其扩展到递送未来带宽需求所需的天线数量的能力方面变得有限，并且需要在DAS上承载信号的建筑物内的基站处发生从IP互联网业务到移动的通信标准的转换。因此，对于未来的系统，容量将变得比覆盖范围更重要（甚至更重要），需要一种新技术。最近，我们设计了一个系统概念，能够解决这个问题（即使它能够使用低带宽的链接，如双绞线电缆），并反过来提出它将如何使一种新的形式的商业模式，在未来的高带宽服务的交付。该技术不仅可以通过硬件销售进行开发，还可以创建新的服务模式，新公司可以采用，实际上创建了相当于“云计算”的移动的服务。因此，这个数字DAS（DDAS）项目的目的是开发一种新的DAS，可以利用现有的以太网基础设施在这些地方，使他们在经济上可行的安装。此外，它提供了一种更灵活的方式来增加容量，因为无线电源是集中的。它打算把目前的低比特率数字DAS系统的实验室示范推向商业化。技术方面的工作将集中在一个原型系统，以展示给潜在的客户，投资者或合作者。商业发展计划将发展与客户及潜在持牌人的关系，同时制定业务计划，目的是在授出期结束时成立一家分拆公司。

项目成果

Digital radio distribution system over multiple cabling types

多种布线类型的数字无线电分配系统

• DOI: 10.1109/mwp.2013.6724058
• 发表时间: 2013
• 作者: Li T

Novel digital radio over fibre for 4G-LTE

适用于 4G-LTE 的新型光纤数字无线电

• DOI: 10.1109/iccw.2015.7247197
• 发表时间: 2015
• 作者: Li T

An optimization model for antenna selection and deployment in single and multi-cell RFID systems

• DOI: 10.1109/rfid-ta.2015.7379803
• 发表时间: 2015-01
• 期刊: 2015 IEEE International Conference on RFID Technology and Applications (RFID-TA)
• 作者: Sicheng Zou;M. Crisp;S. Sabesan;A. Kadri;R. Penty;I. White

Radio over Fibre Distributed Antenna Systems

光纤无线电分布式天线系统

• 发表时间: 2015
• 作者: Penty R V

Overview of Optical Systems Research at Cambridge University

剑桥大学光学系统研究概况

• 发表时间: 2016
• 作者: WHITE I H