Joint fractional time allocation and beamforming for downlink multiuser MISO systems

Van Dinh Nguyen, Hoang Duong Tuan, Trung Q. Duong, Oh Soon Shin, H. Vincent Poor

Research output: Contribution to journalArticle

4 Scopus citations

Abstract

It is well known that the use of traditional transmit beamforming at a base station (BS) to manage interference in serving multiple users is effective only when the number of users is less than the number of transmit antennas at the BS. Nonorthogonal multiple access (NOMA) can improve the throughput of users with poorer channel conditions by compromising their own privacy, because other users with better channel conditions can decode the information of users with poorer channel conditions. NOMA still prefers that the number of users is less than the number of antennas at the BS transmitter. This letter resolves such issues by allocating separate fractional time slots for serving users with similar channel conditions. This enables the BS to serve more users within a time unit while the privacy of each user is preserved. The fractional times and beamforming vectors are jointly optimized to maximize the system's throughput. An efficient path-following algorithm, which invokes a simple convex quadratic program at each iteration, is proposed for the solution of this challenging optimization problem. Numerical results confirm its versatility.

Original languageEnglish (US)
Pages (from-to)2650-2653
Number of pages4
JournalIEEE Communications Letters
Volume21
Issue number12
DOIs
StatePublished - Dec 2017

All Science Journal Classification (ASJC) codes

  • Modeling and Simulation
  • Computer Science Applications
  • Electrical and Electronic Engineering

Keywords

  • Beamforming
  • Fractional time allocation
  • Nonconvex optimization
  • Path-following method

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