TY - GEN
T1 - Proper time-sharing as a baseline for studying improper signaling in interference channels
AU - Hellings, Christoph
AU - Utschick, Wolfgang
N1 - Publisher Copyright:
© 2018 VDE VERLAG GMBH ∙ Berlin ∙ Offenbach
PY - 2018
Y1 - 2018
N2 - So-called improper complex signals have been shown to be beneficial in the Gaussian interference channel under the assumptions that all input signals are Gaussian and that interference is treated as noise. In order to show the benefits of improper signals, it is necessary to know the best possible strategy with proper signals as a baseline for comparison. Two such baselines have been considered in the existing literature: globally optimal proper signaling strategies without time-sharing as well as with time-sharing in the sense of averaging the per-user rates over several operation points. In this paper, we discuss a third baseline solution: if we interpret time-sharing in a more general way and average not only the rates, but also the transmit powers over several operation points, we can obtain an enlarged proper signaling rate region. In a numerical example, we demonstrate that the comparison between proper signaling and recently proposed improper signaling solutions can lead to quite different conclusions depending on which proper signaling baseline is considered.
AB - So-called improper complex signals have been shown to be beneficial in the Gaussian interference channel under the assumptions that all input signals are Gaussian and that interference is treated as noise. In order to show the benefits of improper signals, it is necessary to know the best possible strategy with proper signals as a baseline for comparison. Two such baselines have been considered in the existing literature: globally optimal proper signaling strategies without time-sharing as well as with time-sharing in the sense of averaging the per-user rates over several operation points. In this paper, we discuss a third baseline solution: if we interpret time-sharing in a more general way and average not only the rates, but also the transmit powers over several operation points, we can obtain an enlarged proper signaling rate region. In a numerical example, we demonstrate that the comparison between proper signaling and recently proposed improper signaling solutions can lead to quite different conclusions depending on which proper signaling baseline is considered.
UR - http://www.scopus.com/inward/record.url?scp=85084147504&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:85084147504
T3 - WSA 2018 - 22nd International ITG Workshop on Smart Antennas
BT - WSA 2018 - 22nd International ITG Workshop on Smart Antennas
PB - VDE VERLAG GMBH
T2 - 22nd International ITG Workshop on Smart Antennas, WSA 2018
Y2 - 14 March 2018 through 16 March 2018
ER -