WiMAX over Fiber System Design for Taiwan High Speed Rail Wireless Communication
Date Issued
2011
Date
2011
Author(s)
Li, Chung-Ming
Abstract
In this thesis, we go into details on radio-over-fiber (RoF) wireless communication system based on WiMAX standard not only for synchronization but also channel estimation and detection performance. In view of synchronization, we discuss the synchronization procedure and algorithms such as carrier frequency offset (CFO) estimation, fine timing and CFO tracking. For another way, we describe the channel estimation methods for the channel measurement. According to the relationship between the variation of channel frequency response (CFR) and channel length, we propose an adaptive channel estimation mechanism which can save computing power. Furthermore, we apply an OFDM-based channel sounder to measure the channel characteristics of RoF system in Taiwan High Speed Rail (THSR) environment at the 2.5GHz band. This measurement system is made of general-purpose commercial equipments. Based on the requirement of channel measurement, the OFDM signal format is able to be flexibly designed. The channel characteristics we are going to measure are the frequency responses, delay spread, angular spread, Doppler spectrum and propagation loss. From the measurement result, a strong line of sight (LOS) component is usually observed and the measured path loss is close to the prediction by the Friss formula.
Radio over Fiber (RoF) technique is attractive for both extending the wireless cell coverage and reducing the cost by using distributed remote antenna units (RAUs). In order to observe multipath effect of WiMAX-RoF system in THSR, we use the Elektrobit C2 channel emulator to simulate three cases which are non-equal fiber length, equal fiber length and RAUs switching. From the simulation, we prove that switching on only one RAU at a time can indeed promote the performance of the whole system.
Radio over Fiber (RoF) technique is attractive for both extending the wireless cell coverage and reducing the cost by using distributed remote antenna units (RAUs). In order to observe multipath effect of WiMAX-RoF system in THSR, we use the Elektrobit C2 channel emulator to simulate three cases which are non-equal fiber length, equal fiber length and RAUs switching. From the simulation, we prove that switching on only one RAU at a time can indeed promote the performance of the whole system.
Subjects
Channel Measurement
OFDM
THSR
WiMAX
RoF
Type
thesis
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