Characterization of SINR region for interfering links with constrained power

  • Authors:
  • Hajar Mahdavi-Doost;Masoud Ebrahimi;Amir K. Khandani

  • Affiliations:
  • Coding and Signal Transmission Laboratory, Department of Electrical and Computer Engineering, University of Waterloo, Waterloo, ON, Canada;Research In Motion, Ottawa, ON, Canada and Coding and Signal Transmission Laboratory, Department of Electrical and Computer Engineering, University of Waterloo, Waterloo, ON, Canada;Department of Electrical and Computer Engineering, University of Waterloo, Waterloo, ON, Canada

  • Venue:
  • IEEE Transactions on Information Theory
  • Year:
  • 2010

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Abstract

In this paper, a communication system including n interfering additive white Gaussian noise (AWGN) links is considered. Each transmitter uses a Gaussian codebook and each receiver only decodes the data of the corresponding transmitter. For the case that the transmit powers are subject to arbitrary linear constraints, a mathematical expression for the boundary points of the signal-to-interference-plus-noise-ratio (SINR) region is obtained. Moreover, when the channels are time-varying and the average powers are constrained, the zero-outage SINR region of the system is derived. In addition, a scenario where the demanded SINR of the users is out of the SINR region is considered. A common approach is to remove a subset of the users such that the demanded SINR can be provided for the remaining users; the removed users are serviced in a later time slot. With the aim of maximizing the number of serviced users in each time slot, a suboptimal algorithm is developed, which outperforms the other known alternatives.