Zhaoyu Zhong

Bi-Perspective Functions for Mixed-Integer Fractional Programs with Indicator Variables

  • Adam N. Letchford
  • Qiang Ni
  • Zhaoyu Zhong
    • Categories (Mixed) Integer Nonlinear Programming, Telecommunications Tags , ,

    Perspective functions have long been used to convert fractional programs into convex programs. More recently, they have been used to form tight relaxations of mixed-integer nonlinear programs with so-called indicator variables. Motivated by a practical application (maximising energy efficiency in an OFDMA system), we consider problems that have a fractional objective and indicator variables simultaneously. … Read more

    An Exact Algorithm for a Resource Allocation Problem in Mobile Wireless Communications

  • Adam N. Letchford
  • Qiang Ni
  • Zhaoyu Zhong
    • Categories (Mixed) Integer Nonlinear Programming, Telecommunications Tags ,

    We consider a challenging resource allocation problem arising in mobile wireless communications. The goal is to allocate the available channels and power in a so-called OFDMA system, in order to maximise the transmission rate, subject to quality of service (QoS) constraints. Standard MINLP software struggled to solve even small instances of this problem. Using outer … Read more