Improper Signaling Versus Time-Sharing in the SISO Z-Interference Channel

Christoph Hellings, Wolfgang Utschick

Research output: Contribution to journalArticlepeer-review

17 Scopus citations


It has recently been shown that improper signaling enlarges the rate region of the Gaussian single-Antenna one-sided interference channel (Z-interference channel, ZIFC) under the assumptions that all input signals are Gaussian and that interference is treated as noise. It was pointed out that this result also holds if time-sharing between different operation points is allowed. However, the existing literature has considered the problem only for time-sharing under short-Term average power constraints, i.e., if the average transmit powers are limited individually in each time slot. We consider the same problem under long-Term average power constraints, where the transmit powers are limited only after averaging over all time slots. Interestingly, this modification changes the outcome of the study significantly: we can show that improper signaling can no longer bring any gains in this case.

Original languageEnglish
Article number7986988
Pages (from-to)2432-2435
Number of pages4
JournalIEEE Communications Letters
Issue number11
StatePublished - Nov 2017


  • Improper signaling
  • Z-interference channel
  • rate region
  • time-sharing


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