Waveform Shaping Transmitter Combining Digital and Analog Circuits for Multi - Valued Signaling

Iijima, Yosuke; Yuminaka, Yasushi

doi:10.1109/ismvl.2019.00012

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Waveform Shaping Using Analog/digital Signal Processing1

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“…To reduce the required operation speed, we propose an analog/digital hybrid FFE transmitter [10], whose diagram is shown in Fig. 5 a. Transmitter signals are generated by subtracting the FFE output signals from the PAM-4 input signals.…”

Section: Waveform Shaping Using Analog/digital Signal Processingmentioning

confidence: 99%

PAM-4 Eye-Opening Monitor Technique Using Gaussian Mixture Model for Adaptive Equalization

Iijima

Taya

Yuminaka

2021

IEICE Trans. Inf. & Syst.

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To meet the increasing demand for high-speed communication in VLSI (very large-scale integration) systems, next-generation highspeed data transmission standards (e.g., IEEE 802.3bs and PCIe 6.0) will adopt four-level pulse amplitude modulation (PAM-4) for data coding. Although PAM-4 is spectrally efficient to mitigate inter-symbol interference caused by bandwidth-limited wired channels, it is more sensitive than conventional non-return-to-zero line coding. To evaluate the received signal quality when using adaptive coefficient settings for a PAM-4 equalizer during data transmission, we propose an eye-opening monitor technique based on machine learning. The proposed technique uses a Gaussian mixture model to classify the received PAM-4 symbols. Simulation and experimental results demonstrate the feasibility of adaptive equalization for PAM-4 coding.

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Section: Waveform Shaping Using Analog/digital Signal Processingmentioning

confidence: 99%