Sum-Rate Maximization Schemes for K-User MISO Interference Channels With a Cognitive Relay

Hun Min Shin, Sang Rim Lee, Han Bae Kong, Inkyu Lee

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


In this paper, we consider K-user multiple-input single-output interference channels with a cognitive relay. Assuming that data of all transmitters and channel state information are known at the cognitive relay, we design a linear precoder for the cognitive relay with the aim of maximizing the sum-rate without changing the transmitter operations at all transmitters. We first define the receiver set as a set which contains a part of the receivers, and then introduce a performance metric called "partial signal-to-interference-plus-noise ratio" (PSINR) based on the receiver set. Then, we can obtain a precoder at the cognitive relay by solving the PSINR maximization problem. The optimal receiver set which yields the maximum sum-rate can be identified by checking all possible receiver sets. Since this exhaustive search has prohibitive complexity, we develop a low complexity set search method by utilizing the properties of the optimal receiver set. Combining the PSINR maximization problem and the low complexity search method, we finally propose a precoder design scheme for the sum-rate maximization. Numerical simulation results confirm that the proposed scheme shows performance close to the projected gradient method with much reduced complexity.

Original languageEnglish
Article number7153577
Pages (from-to)6448-6458
Number of pages11
JournalIEEE Transactions on Wireless Communications
Issue number11
Publication statusPublished - 2015 Nov 1

Bibliographical note

Funding Information:
This work was supported in part by the National Research Foundation of Korea funded by the Korea Government (Ministry of Science, ICT and Future Planning) under Grant 2014R1A2A1A10049769, and in part by the Ministry of Science, ICT and Future Planning (MSIP), Korea, under Grant IITP-2015-H8601-15-1006 of the Convergence Information Technology Research Center (C-ITRC) program supervised by the Institute for Information and Communications Technology Promotion (IITP).

Publisher Copyright:
© 2002-2012 IEEE.


  • Cognitive relay
  • Interference channels with a cognitive relay
  • MIMO systems

ASJC Scopus subject areas

  • Computer Science Applications
  • Electrical and Electronic Engineering
  • Applied Mathematics


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