期刊
JOURNAL OF LIGHTWAVE TECHNOLOGY
卷 39, 期 2, 页码 439-447出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JLT.2020.3027911
关键词
Multi-stage noise shaping; Modulation; Quantization (signal); Topology; Baseband; Long Term Evolution; Delta sigma modulation; single delta sigma modulation; MASH; quantization noise shaping; mobile fronthaul; radio assess network
资金
- National Key R&D Program of China [2018YFB1801300]
- Fundamental andApplied Basic Research Project of Guangzhou City [202002030326]
- Local Innovation and Research Teams Project of Guangdong Pearl River Talents Program [2017BT01X121]
- Pearl River S&T Nova Program of Guangzhou [201710010051, 2018B010114002]
- National Natural Science Foundation of China [61871408]
A novel topology MASH delta-sigma modulator is proposed for enhancing noise-shaping capacity, and detailed comparison with traditional structures is presented. Experimental results show significant performance improvement of the proposed new topology MASH in a 20-km digital mobile fronthaul system.
A novel topology multi-stage noise-shaping (MASH) delta-sigma modulator is proposed for 20-km digital mobile fronthaul (MFH) in this article. In the proposed MASH structure, a newly designed feedback unit is combined with a traditional fourth-order sturdy MASH structure to enhance the noise-shaping capacity. The detailed comparison between the conventional fourth-order single delta-sigma modulator (SDSM) and the proposed new topology MASH is presented in a 512/1024 quadrature amplitude modulation (QAM) orthogonal frequency division multiplexing (OFDM) transmission system with the bandwidth of 1.125 GHz. The OFDM signal is quantized to two bits by SDSM/MASH analog-to-digital conversion (ADC), and this digitized signal is transmitted over 20-km single mode fiber (SMF) in 20-Gbaud 4-level pulse amplitude modulation (PAM4) intensity modulation direct detection (IM/DD) system. The signal to noise ratios (SNRs) of the retrieved OFDM signal utilizing the proposed new topology MASH and the fourth-order SDSM ADCs are 38.7dB and 34.5dB, respectively. In the case of 1024-QAM PAM4 system, the error vector magnitude (EVM) floors of the proposed new topology MASH and the conventional fourth-order SDSM schemes are 1.64% and 1.96% over 20-km SMF transmission at off-line digital signal processing (DSP) reception, and 1.2 dB receiver sensitivity improvement is achieved.
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