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Liu, Youjian Associate Professor

Positions

Research Areas research areas

Research

research overview

  • Dr. Liu's research is focused on the optimization of communication systems and networks, their performance analysis, and their performance upper limit characterization. The interests include artificial intelligence aided wireless and wireline communications, information theory and coding theory.

keywords

  • communication systems and networks, information theory, coding theory

Publications

selected publications

Teaching

courses taught

  • ECEN 3300 - Linear Systems
    Primary Instructor - Fall 2018 / Fall 2019
    Characterization of linear time-invariant systems in time and frequency domains. Continuous time systems are analyzed using differential equations and Laplace and Fourier transforms. Discrete time systems are analyzed using difference equations, Z-transforms and discrete time Fourier transforms. Sampling and reconstruction of signals using the sampling theorem. Applications of linear systems include communications, signal processing, and control systems.
  • ECEN 5612 - Random Processes for Engineers
    Primary Instructor - Fall 2018 / Fall 2019
    Deals with random time-varying functions and is therefore useful in the broad range of applications where they occur. Topics include review of probability, convergence of random sequences, random vectors, minimum mean-square error estimation, basic concepts of random processes, Markov processes, Poisson processes, Gaussian processes, linear systems with random inputs, and Wiener filtering. Applications range from communications, communication networks, and signal processing to random vibration/stress analysis, mathematical finance, physics, etc.
  • ECEN 5692 - Principles of Digital Communication
    Primary Instructor - Spring 2018 / Spring 2019
    Introduces fundamental principles of efficient and reliable transmission of information used in wired and wireless digital communication systems including cable modems, smart phones/tablets, cellular networks, local area (wi-fi) networks, and deep-space communications. Topics include bandwidth and power constraints, digital modulation methods, optimum transmitter and receiver design principles, error rate analysis, channel coding potential in wired/wireless media, trellis coded modulation, and equalization.

Background

International Activities

global connections related to teaching and scholarly work (in recent years)

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