Title: 基於分散式天線無線蜂巢系統之涵蓋範圍與訊號干擾比性能之研究
A Study on Coverage and CIR Performance of a Distributed Antenna Based Cellular System
Authors: 余誌民
Yu, Chih-Min
黃家齊
Huang, Chia-Chi
電信工程研究所
Keywords: 分散式天線;Distributed Antenna
Issue Date: 1996
Abstract: 基於分散式天線無線蜂巢系統之涵蓋範圍與信號干擾比性能之研究
摘要本論文主要研究在基於分散式天線蜂巢式無線網路系統的涵蓋範圍及
訊號干擾比之電腦模擬分析。在單細胞的分散式天線系統 (Distributed
Antenna Based System) 架構中,訊號經調變及多工在有線電纜同時廣播
傳送出去,射頻放大器和頻率轉換器可用來補償訊號在電纜的損耗。對建
立一個無線蜂巢式架構網路而言,從本文的電腦模擬可以觀察出基於分散
式天線系統比基於集中式天線系統在涵蓋範圍 (Coverage Performance)
及抗干擾訊號 (CIR) 的能力有較佳的性能。對單細胞基於分散式天線系
統而言,從電纜長度效應考量來獲得最佳天線位置,同時對下鏈傳送找出
較佳的功率分配,接著考量如何將基於分散式天線系統設計在現有有線電
視的網路 (CATV Network) 架構上。我們針對單細胞系統架構,在
Rayleigh和shadow衰減通道環境下,從接收信號強度分佈來比較基於分散
式天線系統和基於集中式天線系統的涵蓋範圍性能。並且針對慢跳頻的分
時多重進接 (SFH Based TDMA) 蜂巢式系統架構,在Rayleigh和shadow衰
減通道環境下,比較基於分散式天線系統和基於集中式天線系統的訊號干
擾比分佈。實質上,對一個蜂巢式系統的信號干擾比分佈而言,基於分散
式天線系統比起基於集中式天線系統有較好的性能改善。
A Study on Coverage and CIR Performance of a Distributed
Antenna Based Cellular SystemAbstract In this thesis, a
computer simulation study on coverage performance and
interference rejection capability of a distributed antenna based
wireless cellular network is presented. The same signal is
simulcast from several antennas in a cell of a distributed
antenna based system. Signals could be modulated and multiplexed
for radio transmission at a single node, then transmitted
through a coaxial cable based distribution system to distributed
antennas in a cell. Frequency up/down conversion and radio
frequency(RF) amplification may be needed at each remote antenna
port. It is observed from our simulation study that a
distributed antenna based system has the potential to provide a
larger cell coverage area and better CIR performance as compared
with a central antenna based system in establishing a wireless
cellular network. The cable length effect is simulated to find
the optimum location for deploying antenna nodes. Downlink
radiation power is adjusted in our simulation in order to obtain
the best power distribution ratio in a distributed antenna based
system. We also discuss how to plant the cell topology of a
distributed antenna based system onto the architecture of a
existing CATV network system.Computer simulations are used to
evaluate the coverage performance from the distribution of
received signal strength in a single cell architecture for both
a central antenna based system and a distributed antenna based
system in both a shadow fading environment and a Rayleigh fading
environment. This paper also presents simulation results on
carrier-to-interference ratio (CIR) performance for both a
distributed antenna based system and a central antenna based
system in a slow frequency hopping based TDMA system. The use of
distributed antennas can substantially improve the CIR
distribution of a cellular radio system over a central antenna
based system in both a shadow fading environment and a shadow/
Rayleigh fading environment.
URI: http://140.113.39.130/cdrfb3/record/nctu/#NT850436062
http://hdl.handle.net/11536/62141
Appears in Collections:Thesis