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학술지 A Digitized IF-Over-Fiber Transmission Based on Low-Pass Delta-Sigma Modulation
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저자
장승현, 조권도, 정재호, 박봉혁, 홍성철
발행일
201412
출처
IEEE Photonics Technology Letters, v.26 no.24, pp.2484-2487
ISSN
1041-1135
출판사
IEEE
DOI
https://dx.doi.org/10.1109/LPT.2014.2361753
협약과제
14PI2100, LTE-A기지국용 전력증폭기를 포함하는 RF Transceiver통합칩 개발, 박봉혁
초록
In this letter, we propose and demonstrate a digitized intermediate frequency (IF)-over-fiber transmission system based on the delta-sigma modulation technique as a means of digitizing an analog IF signal. Using a realized 130-nm CMOS, two-level third-order low-pass delta-sigma modulator (DSM) chip operating at 622.08 MHz, a 64-Quadrature Amplitude Modulation long-term evolution (LTE) 10-MHz signal at a 10-MHz IF frequency was successfully digitized, transported over an emulated digital fiber-optic link, and analyzed in terms of signal spectra, error vector magnitude (EVM), and constellations. The difference between power levels of the received LTE IF signal and quantization noise due to the developed DSM was larger than 45 dB, and an EVM value of 2.48% for the received LTE signal was obtained.
키워드
64-QAM, Delta-sigma modulation, IoF, LTE, OFDM, RoF
KSP 제안 키워드
64-QAM, Delta-Sigma Modulation, Delta-Sigma Modulator, Digital fiber, Fiber transmission, Intermediate frequency, Long term Evolution(LTE), Power Levels, Quadrature-amplitude modulation(QAM), Quantization Noise, Signal spectra