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Conference Paper
Cost-Effective Bidirectional Digitized Radio-over-fiber Systems Employing Sigma Delta Modulation
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- Authors
- Kyung Woon Lee, HyunDo Jung, Jung Ho Park
- Issue Date
- 2016-11
- Citation
- Infrared, Millimeter-Wave, and Terahertz Technologies IV (SPIE 10030), v.10030, pp.1-7
- Publisher
- SPIE
- Language
- English
- Type
- Conference Paper
- Abstract
- We propose a cost effective digitized radio-over-fiber (D-RoF) system employing a sigma delta modulation (SDM) and a bidirectional transmission technique using phase modulated downlink and intensity modulated uplink. SDM is transparent to different radio access technologies and modulation formats, and more suitable for a downlink of wireless system because a digital to analog converter (DAC) can be avoided at the base station (BS). Also, Central station and BS share the same light source by using a phase modulation for the downlink and an intensity modulation for the uplink transmission. Avoiding DACs and light sources have advantages in terms of cost reduction, power consumption, and compatibility with conventional wireless network structure. We have designed a cost effective bidirectional D-RoF system using a low pass SDM and measured the downlink and uplink transmission performance in terms of error vector magnitude, signal spectra, and constellations, which are based on the 10MHz LTE 64-QAM standard.
- KSP Keywords
- 64-QAM, Central station, Intensity modulation(IM), Light source, Modulation format, Network structure, Power Consumption, Radio Access Technologies(RATs), Radio over fiber(RoF), RoF system, Sigma-delta modulation