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Updated: Jan 12, 2026

Studying Cavitation Enhanced Therapy
Published on: April 9, 2021
Channel-response-aware delta-sigma modulator design for low-resolution DAC-based pre-equalization systems
Abstract:
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.
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