Relay-Aided Space-Time Beamforming for Interference Networks with Partial Channel Knowledge

Wonjae Shin, Namyoon Lee, Jungwoo Lee, H. Vincent Poor

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


This paper proposes a novel multiantenna relay-aided interference management technique that requires limited channel knowledge for interference relay channels, which is referred to as relay-aided space-time beamforming (r-STBF). Using the proposed method, it is shown that {KM}1/4{K+M-1} multiplexing gain is achievable in a K-user multiple-input single-output (MISO) interference relay channel when the relay has M antennas with a certain type of limited channel knowledge. By leveraging this result, it is demonstrated that the interference-free multiplexing gain of K is asymptotically achievable as M approaches infinity. Furthermore, the proposed r-STBF method is shown to achieve the optimal multiplexing gain of {KL}1/4{K+L-1} for a K × L single-input single-output (SISO) X channel with an M-antenna relay. One major implication of these results is that the use of a relay is beneficial in obtaining the optimal multiplexing gains for relay-aided interference networks even with limited channel knowledge, which bridges the theory-practice gap by implementing advanced interference management methods with less overhead for practical wireless systems.

Original languageEnglish (US)
Article number7514925
Pages (from-to)5119-5130
Number of pages12
JournalIEEE Transactions on Signal Processing
Issue number19
StatePublished - Oct 1 2016

All Science Journal Classification (ASJC) codes

  • Signal Processing
  • Electrical and Electronic Engineering


  • Multiplexing gain
  • X channel
  • interference alignment
  • interference channel
  • relay


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