Ming-Li Yee

Radio-over-Fiber Distributed Antenna System for WiMAX Bullet Train Field Trial

Wireless broadband access for mobile applications is an area of increasing growth. An international collaboration, led by the Taiwan Industrial Technology Research Institute (ITRI), has been working to implement a dedicated WiMAX network for a user field trial on the Taiwan High Speed Rail (THSR) bullet train system. Continuous wireless coverage at train speeds up to 300km/hr is challenging due to a number of critical issues, including handover at high speeds and coverage in challenging terrain such as tunnels. A Radio-over-Fiber (RoF) Distributed Antenna System (DAS) was developed by Corning Incorporated to address the critical issue of handover and increase the coverage for each WiMAX basestation. For a DAS deployment consisting of multiple discrete antennas, proper signal strength management is required because the maximum delay spread allowed by the WiMAX protocol is easily surpassed at realistic fiber ranges up to 9km. This paper reviews some of the initial results of the RoF DAS experiments in SongShan tunnel in Taipei. Error-free signal transmission was achieved when the difference in received power from two consecutive antennas was greater than 10dB.

Performance Evaluation of MB-OFDM Ultra-Wideband Signals over Single mode Fiber

A study on multi-band-orthogonal frequency division multiplexing (MB-OFDM) Ultra-Wideband (UWB) signal transmission through an single-mode fiber based intensity modulated laser via Radio over Fiber system is presented. MB-OFDM compliant UWB signals with frequency ranging between 3.1 GHz to 4.8 GHz are generated using the WisAir Development Kit DV9110M. Packet Error Rate measurement is performed to evaluate the system performance based on different optical fiber lengths, data rates, and transmitting UWB power levels. The results of sending UWB signals over RoF show very encouraging results over long distances even in the demanding ultra-wideband environment.

Direct transmission of ultra wide band signals using single mode radio-over-fiber system

This paper investigates the transmission characteristic of ultra wide band radio through a single mode radio-over-fiber system. The UWB pulse radio has a frequency span of 3GHz to 6GHz and is transmitted through a single mode optical fiber using a laser and a photodiode. BER measurements will be presented to evaluate the performance of the ultra wide band radio.

Transmission of Ultra Wideband Signals through Radio-over-Fiber Systems

This paper investigates ultra wideband (UWB) transmission through single and multi-mode radio-over-fiber (ROF) systems at 1 Gbps. The bit-error-rate (BER) measurements for both ROF systems show transmission range improvement for UWB signals

Performance Study of MB-OFDM Ultra-Wideband Signals over Multimode Fiber

This paper presents a study on multiband-orthogonal frequency division mutiplexing (MB-OFDM) Ultra-Wideband (UWB) signal transmission through a vertical cavity surface emission lasers and multimode fiber based Radio over Fiber system. The MB-OFDM UWB signals with frequency ranging from 3.1 GHz to 4.8GHz are generated by the available commercial product -WisAir Development Kit DV9110M. Packet Error Rate measurement is performed to evaluate the system performance.

MB-OFDM UWB signal co-transmission with WCDMA, WLAN and GSM over multi-mode radio-over-fiber

In this paper, the performance of Multiband - Orthogonal Frequency Division Multiplexing (MB-OFDM) Ultra-WideBand (UWB) signal over a multimode fiber based radio-over-fiber (ROF) link is discussed. Co-transmission of UWB signals with other wireless signal standards including W-CDMA (2.15GHz), WLAN802.11a/g, and GSM (1.8GHz) are considered. Based on the measurement results, it has been shown that UWB signals can be transmitted without error over 400 meters for the highest data rate of 480 Mbps using the system proposed. Co-transmission can also be successfully done with minimal mutual interference.

WiMedia Ultra-Wide Band Transmission in Radio over Fiber using Multimode Fiber

WiMedia compliant Ultra-Wideband signals are transmitted in a low cost Radio over Fiber system over extended distances to 900 m. Measured packet error rate shows the merit of UWB transmission and extension in the ROF medium. Significant range extension has been demonstrated using ROF.

Low-cost Radio-Over-Fiber in-building distribution network for WLAN, UWB and digital TV broadcasting

A low cost radio-over-fiber in-building distributed network system is presented in this paper. The transmission characteristics are presented showing the performance figure of merits and possibilities of WLAN and UWB wireless transmission along side legacy cable-based RF signals in a low-cost wideband VCSEL-based ROF access network. The novelty of this ROF distribution system makes it ideal as the next generation of access networks for integrated high-speed combined wired and wireless access FTTH/FTTP networks allowing multiple access technologies to the home, for both legacy and future access technologies.

Transmission of ultra wide band radio using multimode radio-over-fiber system

Existing regulatory restricts wireless range of ultra wide band (UWB) radio communication distances to several tens of meters due to its low transmit power. This paper introduces multimode radio-over-fiber (ROF) to extend the range of wireless UWB radios. In this work, UWB pulses are transmitted over multimode RoF to realise a low cost distributed antenna system. Single mode RoF tends to be expensive. Experimental BER results over various transmission distances will be presented.

Performance analysis of IEEE 802.16e WiMAX Radio-over-fiber distributed antenna system

Interest in Radio-over-Fiber (RoF) networks has been gaining increasing popularity for RF distribution networks. This paper examines link transmission quality over RoF of the WiMAX signal between the base station and RAU in both downlink and uplink instances experimentally. EVM results are presented to illustrate the effectiveness of a fiber link for RF signal distribution. Downlink EVM performance was measured to be better than 3.1% for a RF power range of between −3dBm to 10dBm over 5km RoF. Uplink EVM with AGC was better than 3.1% for an RF input signal range between −70dBm to −45dBm over 5km RoF.