Channel-response-aware delta-sigma modulator design for low-resolution DAC-based pre-equalization systems
In this Letter, we propose and demonstrate a channel-response-aware delta-sigma modulator (CRA-DSM) optimized by a genetic algorithm for low-resolution digital-to-analog converter (DAC)-based pre-equalization systems. CRA-DSM adaptively shapes the noise distribution to match the channel frequency response, flattening and improving signal-to-noise ratio (SNR) without additional hardware complexity. Transmission of a 32 Gb/s 16-quadrature amplitude modulation (QAM) discrete multi-tone (DMT) signal over a low-pass channel and a 15.2 Gb/s 16-QAM orthogonal frequency division multiplexing (OFDM) signal over a 5.5 GHz bandpass channel is experimentally demonstrated. The results show that CRA-DSM outperforms traditional DSM, achieving 1.6 dB and 1.2 dB SNR gains in the two channels, respectively. These results verify CRA-DSM as a practical solution for bandwidth-limited mobile fronthaul systems.
Authors
- Lei Deng (ORCID: https://orcid.org/0000-0003-0391-6180)
- Qi Yang (ORCID: https://orcid.org/0000-0003-4613-7582)
- Xiaoxiao Dai (ORCID: https://orcid.org/0000-0003-3408-7493)
- Shenmao Zhang (ORCID: https://orcid.org/0000-0002-7704-9991)
- Mengfan Cheng (ORCID: https://orcid.org/0000-0002-8221-0612)
- Linsheng Zhong (ORCID: https://orcid.org/0000-0002-5737-499X)
- Yuming Zhao (ORCID: https://orcid.org/0000-0002-2548-5767)
- Deming Liu (ORCID: https://orcid.org/0000-0001-5591-2929)
- Sunningchang Zhang
Institutions
- Huazhong University of Science and Technology (CN)
Publication Details
- Journal
- Optics Letters
- Published
- 2025-10-24
- DOI
- https://doi.org/10.1364/ol.578563
- Primary Topic
- Analog and Mixed-Signal Circuit Design
- Type
- article
- Field-Weighted Citation Impact
- 0.00