A Flash LiDAR with SA-Based Pulse Position Modulation for Multi-user Interference Cancellation

Jundong Yeo; Seonghyeok Park; Yunji Hong; Jaehyuk Choi; Jung Hoon Chun; Seong Jin Kim

doi:10.1109/ISCAS56072.2025.11044208

A Flash LiDAR with SA-Based Pulse Position Modulation for Multi-user Interference Cancellation

Jundong Yeo, Seonghyeok Park, Yunji Hong, Jaehyuk Choi, Jung Hoon Chun, Seong Jin Kim

Department of Semiconductor Systems Engineering

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

Abstract

This paper presents a flash LiDAR system based on successive approximation (SA) in-pixel histogramming time-to-digital converter (hTDC) featuring pulse position modulation (PPM) to suppress interference from other light sources. The pulse position is randomly shifted with the start time of the hTDC, spreading out interference equally to both bins and canceling it by the up-down counting with no demodulation process. The PPM modulator is implemented in an FPGA with a flash LiDAR sensor and is fully characterized. The proposed SA-based PPM successfully attenuates 16-fold larger interference than the user's optical power, achieving a frame rate of 30 fps and a success rate of 99.9% at the same time.

Original language	English
Title of host publication	ISCAS 2025 - IEEE International Symposium on Circuits and Systems, Proceedings
Publisher	Institute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)	9798350356830
DOIs	https://doi.org/10.1109/ISCAS56072.2025.11044208
State	Published - 2025
Event	2025 IEEE International Symposium on Circuits and Systems, ISCAS 2025 - London, United Kingdom Duration: 25 May 2025 → 28 May 2025

Publication series

Name	Proceedings - IEEE International Symposium on Circuits and Systems
ISSN (Print)	0271-4310

Conference

Conference	2025 IEEE International Symposium on Circuits and Systems, ISCAS 2025
Country/Territory	United Kingdom
City	London
Period	25/05/25 → 28/05/25

Keywords

direct Time-of-Flight
histogram
LiDAR
multi-user interference
pulse position modulation
successive approximation
time-to-digital converter

Access to Document

10.1109/ISCAS56072.2025.11044208

Cite this

Yeo, J., Park, S., Hong, Y., Choi, J., Chun, J. H., & Kim, S. J. (2025). A Flash LiDAR with SA-Based Pulse Position Modulation for Multi-user Interference Cancellation. In ISCAS 2025 - IEEE International Symposium on Circuits and Systems, Proceedings (Proceedings - IEEE International Symposium on Circuits and Systems). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/ISCAS56072.2025.11044208

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title = "A Flash LiDAR with SA-Based Pulse Position Modulation for Multi-user Interference Cancellation",

abstract = "This paper presents a flash LiDAR system based on successive approximation (SA) in-pixel histogramming time-to-digital converter (hTDC) featuring pulse position modulation (PPM) to suppress interference from other light sources. The pulse position is randomly shifted with the start time of the hTDC, spreading out interference equally to both bins and canceling it by the up-down counting with no demodulation process. The PPM modulator is implemented in an FPGA with a flash LiDAR sensor and is fully characterized. The proposed SA-based PPM successfully attenuates 16-fold larger interference than the user's optical power, achieving a frame rate of 30 fps and a success rate of 99.9\% at the same time.",

keywords = "direct Time-of-Flight, histogram, LiDAR, multi-user interference, pulse position modulation, successive approximation, time-to-digital converter",

author = "Jundong Yeo and Seonghyeok Park and Yunji Hong and Jaehyuk Choi and Chun, \{Jung Hoon\} and Kim, \{Seong Jin\}",

note = "Publisher Copyright: {\textcopyright} 2025 IEEE.; 2025 IEEE International Symposium on Circuits and Systems, ISCAS 2025 ; Conference date: 25-05-2025 Through 28-05-2025",

year = "2025",

doi = "10.1109/ISCAS56072.2025.11044208",

language = "English",

series = "Proceedings - IEEE International Symposium on Circuits and Systems",

publisher = "Institute of Electrical and Electronics Engineers Inc.",

booktitle = "ISCAS 2025 - IEEE International Symposium on Circuits and Systems, Proceedings",

}

Yeo, J, Park, S, Hong, Y, Choi, J , Chun, JH & Kim, SJ 2025, A Flash LiDAR with SA-Based Pulse Position Modulation for Multi-user Interference Cancellation. in ISCAS 2025 - IEEE International Symposium on Circuits and Systems, Proceedings. Proceedings - IEEE International Symposium on Circuits and Systems, Institute of Electrical and Electronics Engineers Inc., 2025 IEEE International Symposium on Circuits and Systems, ISCAS 2025, London, United Kingdom, 25/05/25. https://doi.org/10.1109/ISCAS56072.2025.11044208

A Flash LiDAR with SA-Based Pulse Position Modulation for Multi-user Interference Cancellation. / Yeo, Jundong; Park, Seonghyeok; Hong, Yunji et al.
ISCAS 2025 - IEEE International Symposium on Circuits and Systems, Proceedings. Institute of Electrical and Electronics Engineers Inc., 2025. (Proceedings - IEEE International Symposium on Circuits and Systems).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

TY - GEN

T1 - A Flash LiDAR with SA-Based Pulse Position Modulation for Multi-user Interference Cancellation

AU - Yeo, Jundong

AU - Park, Seonghyeok

AU - Hong, Yunji

AU - Choi, Jaehyuk

AU - Chun, Jung Hoon

AU - Kim, Seong Jin

PY - 2025

Y1 - 2025

N2 - This paper presents a flash LiDAR system based on successive approximation (SA) in-pixel histogramming time-to-digital converter (hTDC) featuring pulse position modulation (PPM) to suppress interference from other light sources. The pulse position is randomly shifted with the start time of the hTDC, spreading out interference equally to both bins and canceling it by the up-down counting with no demodulation process. The PPM modulator is implemented in an FPGA with a flash LiDAR sensor and is fully characterized. The proposed SA-based PPM successfully attenuates 16-fold larger interference than the user's optical power, achieving a frame rate of 30 fps and a success rate of 99.9% at the same time.

AB - This paper presents a flash LiDAR system based on successive approximation (SA) in-pixel histogramming time-to-digital converter (hTDC) featuring pulse position modulation (PPM) to suppress interference from other light sources. The pulse position is randomly shifted with the start time of the hTDC, spreading out interference equally to both bins and canceling it by the up-down counting with no demodulation process. The PPM modulator is implemented in an FPGA with a flash LiDAR sensor and is fully characterized. The proposed SA-based PPM successfully attenuates 16-fold larger interference than the user's optical power, achieving a frame rate of 30 fps and a success rate of 99.9% at the same time.

KW - direct Time-of-Flight

KW - histogram

KW - LiDAR

KW - multi-user interference

KW - pulse position modulation

KW - successive approximation

KW - time-to-digital converter

UR - https://www.scopus.com/pages/publications/105010608835

U2 - 10.1109/ISCAS56072.2025.11044208

DO - 10.1109/ISCAS56072.2025.11044208

M3 - Conference contribution

AN - SCOPUS:105010608835

T3 - Proceedings - IEEE International Symposium on Circuits and Systems

BT - ISCAS 2025 - IEEE International Symposium on Circuits and Systems, Proceedings

PB - Institute of Electrical and Electronics Engineers Inc.

T2 - 2025 IEEE International Symposium on Circuits and Systems, ISCAS 2025

Y2 - 25 May 2025 through 28 May 2025

ER -

Yeo J, Park S, Hong Y, Choi J , Chun JH, Kim SJ. A Flash LiDAR with SA-Based Pulse Position Modulation for Multi-user Interference Cancellation. In ISCAS 2025 - IEEE International Symposium on Circuits and Systems, Proceedings. Institute of Electrical and Electronics Engineers Inc. 2025. (Proceedings - IEEE International Symposium on Circuits and Systems). doi: 10.1109/ISCAS56072.2025.11044208

A Flash LiDAR with SA-Based Pulse Position Modulation for Multi-user Interference Cancellation

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Keywords

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