상세정보
학술대회
Cost-Effective Bidirectional Digitized Radio-over-fiber Systems Employing Sigma Delta Modulation
- 저자
- 이경운, 정현도, 박정호
- 발행일
- 201611
- 출처
- Infrared, Millimeter-Wave, and Terahertz Technologies IV (SPIE 10030), v.10030, pp.1-7
- 협약과제
- 16MB1200, 소프트웨어 정의 네트워크(SDN) 기반 Flexible 광노드 핵심기술 개발, 백용순
- 초록
- 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 제안 키워드
- 64-QAM, Bidirectional transmission, Central station, Digital to Analog Converter, Intensity Modulation, Light sources, Modulation format, Power Consumption, Radio Access Technologies, Radio over fiber(ROF), Radio-over-fiber system