【资料名称】：Radio over Fiber based Network Architecture

【资料作者】：vorgelegt von Master of Science Hong Bon

【资料日期】：2005

【资料语言】：英文

【资料格式】：PDF

【资料目录和简介】：

Abstract
To meet the explosive demands of high-capacity and broadband wireless access, modern cell-based wireless
networks have trends, i.e., continuous increase in the number of cells and utilzation of higher frequency
bands. It leads to a large amount of base stations (BSs) to be deployed; therefore, cost-effective
BS development is a key to success in the market. In order to reduce the system cost, radio over ber
(RoF) technology has been proposed since it provides functionally simple BSs that are interconnected to
a central control station (CS) via an optical ber. It has the following main features: (1) it is transparent
to bandwidth or modulation techniques, (2) simple and small BSs, (3) centralized operation is possible.
Extensive research efforts have been devoted to the development of physical layer such as simple BS
development and radio signal transport techniques over ber, but few have been reported about upper
layer and resource management issues for RoF networks. In this dissertation, we are concerned with
RoF based network architecture that makes efcient use of its centralized control capability to address
mobility management and bandwidth allocation. This work consists of three parts. In the rst study, we
consider RoF based wireless local area network (WLAN) operating at 60 GHz bands, which can provide
high capacity wireless access; however, due to high propagation and penetration loss in the frequency
bands a typical room in a building surrounded by walls must be supported by at least one BS. As a result,
numerous BSs are required to cover the building. In such an environment slight movement of mobile
hosts (MHs) could trigger handover, which is quite different situation compared to conventional WLAN
systems; therefore, it is obvious that handover management becomes a signicant issue. In the study,
we propose a medium access control (MAC) protocol featuring fast and simple handover and quality of
service support. It utilizes orthogonal frequency switching codes to avoid co-channel interference between
adjacent cells and achieves fast handover at the cost of bandwidth. Six variants of the protocol are
considered and evaluated by a simulation study. In the second study, RoF based network architecture for
road vehicle communication (RVC) system at mm-wave bands is proposed. In this case handover management
becomes even more signicant and difcult due to small cell and high user mobility. An MAC
protocol based on dynamic time division multiple access (TDMA) is proposed, which supports fast and
simple handover as well as bandwidth allocation according to the movement of vehicles. Bandwidth
management schemes maintaining high handover quality are also proposed and evaluated by a simulation
study. An RoF based broadband wireless access network architecture for sparsely populated rural
and remote areas is presented in the third study. In the architecture a CS has optical tunable-transmitter
(TT) and tunable-receiver (TR) pairs and utilizes wavelength division multiplexing to access numerous