Title :
Linear superposition coding for the Gaussian MAC with quantized feedback
Author :
Stefan Farthofer;Gerald Matz
Author_Institution :
Institute of Telecommunications, Vienna University of Technology, Gusshausstrasse 25/389, 1040, Austria
Abstract :
We propose a linear transceiver scheme for the symmetric two-user multiple access channel with additive white Gaussian noise and quantized feedback. The quantized feedback link is modeled as an information bottleneck subject to a rate constraint. We introduce a superposition scheme that splits the transmit power of each user between an Ozarow-like code (designed for perfect rate-limited feedback) and a conventional code that ignores the feedback. We study the achievable sum rate as a function of the feedback quantization rate and we show that sum rate maximization leads to a difference of convex functions problem that we solve via the convex-concave procedure.
Keywords :
"Encoding","Quantization (signal)","Receivers","Transmitters","Signal to noise ratio","Markov processes","Resource management"
Conference_Titel :
Communication, Control, and Computing (Allerton), 2015 53rd Annual Allerton Conference on
DOI :
10.1109/ALLERTON.2015.7447168