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Yosuke Iijima

Possible papers associated with this exact author name in Arrow. This page groups case-insensitive exact name matches and is not a full identity disambiguation profile.

3 papers

1 author row

FLAP Journal 2023 Journal Article

Multi-Valued Data Transmission Quality Evaluation Using Two-Dimensional PAM-4 Symbol Mapping.

Kazuharu Nakajima
Yasushi Yuminaka
Yosuke Iijima

This paper presents an eye-opening monitor technique leveraging four-level pulse amplitude modulation (PAM-4) symbol transition characteristics. This approach facilitates the evaluation of data transmission quality concerning the adaptive coefficient settings of PAM-4 equalizers. The two-dimensional (2D) symbol transition mapping visually depicts the degree of intersymbol interfer- ence (ISI). This work expands upon the 2D mapping model introduced in [14], adding more theoretical analysis and new simulation results. Both simulation and empirical results indicate that 2D symbol mapping can assess the quality of PAM-4 data transmission impaired by ISI and can visually represent the equalization effect. This paper is an extension of [14]. This work was supported by JSPS KAKENHI Grant Numbers 21K11819 and 21H01381.

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FLAP Journal 2022 Journal Article

Efficient PAM-4 Symbol Estimation Using Soft Clustering.

Yosuke Iijima
Yasushi Yuminaka

Multi-valued data transmission using four-level pulse amplitude modulation (PAM-4) is promising for alleviating the bandwidth limitation of interconnects. To evaluate the received signal quality during data transmission when using adaptive coefficient settings for a PAM-4 equalizer, we propose an eye-opening monitor method based on statistics of PAM-4 symbol transition. The proposed statistical eye-opening monitor is based on soft clustering and enables efficient PAM-4 data transmission under closed-eye conditions. Simulation results demonstrate the feasibility of symbol classification using the proposed statistical evaluation method.

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FLAP Journal 2020 Journal Article

PAM-4 Signal Transmitter using FPGA and DAC for Serial-link Test.

Yasushi Yuminaka
Natsuki Sato
Takahito Chigira
Kohei Toyoda
Yosuke Iijima

As next-generation high-speed data transmission standards, 4-level pulse amplitude modulation (PAM-4) signaling is adopted to support 400 Gbps data transmission. This paper proposes a multi-valued signal transmitter for PAM-4 serial-link tests. An arbitrary signal generator was designed using a high-speed digital-to-analog converter (DAC) and an FPGA. This system can be used for evaluating feed-forward equalization (FFE) and predistortion at a transmitter side by emulating a transmitter for PAM-4 serial link. FFE and predistortion design examples for PAM-4 signaling are shown and experimentally verified using the FPGA-based DAC.

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