상세정보
학술지
Clipping Distortion Suppression of Directly Modulated Multi-IF-over-Fiber Mobile Fronthaul Links Using Shunt Diode Predistorter
- 발행일
- 201604
- 출처
- ETRI Journal, v.38 no.2, pp.227-234
- ISSN
- 1225-6463
- 출판사
- 한국전자통신연구원 (ETRI)
- 협약과제
- 15ZI1300, 광 기반 Compact Radio & Dense Digital 이동통신 기지국 핵심기술 개발, 이종현
- 초록
- Herein, we demonstrate clipping distortion suppression of directly modulated multi-IF-over-fiber links using a simple shunt diode predistorter. The dynamic range of a directly modulated analog fiber optic link is limited by nonlinear distortions caused by laser-diode clipping. We investigate the link performance in the context of carrierto- noise and distortion ratio (CNDR) and error vector magnitude (EVM) requirements when supporting LTE-A services. We also design an analog predistorter with a shunt-diode structure, and demonstrate experimentally that the predistorter has the ability to suppress clippinginduced third-order intermodulation distortions of the link by at most 14 dB. It also improves the CNDR and EVM of the 4-IF-multiplexed LTE-A carriers by 7 dB and 2.9%, respectively.
- KSP 제안 키워드
- Clipping Distortion, Directly modulated, Distortion ratio, Link Performance, Long term evolution-advanced(LTE-A), Mobile fronthaul, analog predistorter(APD), dynamic range, error vector magnitude, fiber optic link, intermodulation distortion