Publications by Sitian Li | EPFL Graph Search

Vital Signs and Human Activity Sensing with Wireless Systems

Wireless communication systems constantly estimate and equalize the channel to ensure reliable information transmission. The channel estimation not only facilitates effective communication, but also provides an opportunity to infer the physical environment ...

EPFL2025

Device-Free Floor-Scale Human Detection With Indoor LTE Antennas

Andreas Peter Burg, Sitian Li

This paper introduces a novel method for device-free human detection by leveraging existing wireless communication signals from 4G-long-term evolution (4G-LTE) systems. By utilizing the pervasive 4G-LTE signals, our approach enhances the efficiency and cov ...

2025

Learning-based Hand Gesture Classification using Channel Impulse Response with UWB

Andreas Peter Burg, Sitian Li

The channel impulse response (CIR) of the wireless propagation channel is influenced by the surrounding environment and thus can be used to retrieve environmental information such as location, the presence of objects, and the speed of objects. In this work ...

Institute of Electrical and Electronics Engineers Inc.2024

Monostatic Multi-Target Wi-Fi-Based Breathing Rate Sensing Using Openwifi

Andreas Peter Burg, Andreas Toftegaard Kristensen, Sitian Li

Continuous monitoring of human activity and vital signs has become increasingly important in healthcare and consumer applications. While wearables and others sensors are already in widespread use, they often suffer from issues such as discomfort and the ne ...

Institute of Electrical and Electronics Engineers Inc.2024

Band-of-Interest-based Channel Impulse Response Fusion for Breathing Rate Estimation with UWB

Andreas Peter Burg, Alexios Konstantinos Balatsoukas Stimming, Sitian Li

The channel impulse response (CIR) obtained from the channel estimation step of various wireless systems is a widely used source of information in wireless sensing. Breathing rate is one of the important vital signs that can be retrieved from the CIR. Rece ...

IEEE2023

ComplexBeat: Breathing Rate Estimation from Complex CSI

Andreas Peter Burg, Alexios Konstantinos Balatsoukas Stimming, Andreas Toftegaard Kristensen, Sitian Li

In this paper, we explore the use of channel state information (CSI) from a WiFi system to estimate the breathing rate of a person in a room. In order to extract WiFi CSI components that are sensitive to breathing, we propose to consider the delay domain c ...

IEEE, ELECTRON DEVICES SOC & RELIABILITY GROUP2021

On the Advantage of Coherent LoRa Detection in the Presence of Interference

Andreas Peter Burg, Alexios Konstantinos Balatsoukas Stimming, Orion Afisiadis, Joachim Tobias Tapparel, Sitian Li

It has been shown that the coherent detection of long range (LoRa) signals only provides marginal gains of around 0.7 dB on the additive white Gaussian noise (AWGN) channel. However, ALOHA-based massive Internet-of-Things systems, including LoRa, often ope ...

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC2021

Training Channel Selection for Learning-based 1-bit Precoding in Massive MU-MIMO

Andreas Peter Burg, Alexios Konstantinos Balatsoukas Stimming, Sitian Li

Learning-based algorithms have gained great popularity in communications since they often outperform even carefully engineered solutions by learning from training samples. In this paper, we show that the selection of appropriate training examples can be im ...

IEEE2020