Designs of MIMO Amplify-and-Forward Wireless Relaying Networks: Practical Challenges and Solutions Based on MSE Decomposition

Changick Song, Kyoung Jae Lee, Inkyu Lee

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)


Amplify-and-forward (AF) relaying is an efficient way to extend radio range and improve link reliability with a low implementation cost. While the research on the AF relaying in a single-antenna scenario has matured, its application to broadband radio transmission utilizing multiple-input multiple-output techniques still needs more effort to overcome several practical challenges, such as large overheads for channel estimation and vulnerability to the channel estimation errors. This paper reviews some recently proposed linear transceiver designs based on the minimum mean squared error (MSE) criterion and shows that the proposed MSE decomposition and relaxation method can lead to an efficient solution for those challenges. Insightful observations and comprehensive discussions are also made on both analytical and numerical results from practical implementation perspectives.

Original languageEnglish
Article number7926352
Pages (from-to)9223-9234
Number of pages12
JournalIEEE Access
Publication statusPublished - 2017

Bibliographical note

Funding Information:
This work was supported in part by the National Research Foundation of Korea through the Korea Government under Grant 2014R1A2A1A1004976, Grant 2015R1C1A1A02036927, and Grant 2017R1A2B3012316; and in part by the Institute for Information and Communications Technology Promotion through the Korea Government under Grant B0722-16-0006 (Cross-layer design of cryptography and physical-layer security for IoT networks).

Publisher Copyright:
© 2017 IEEE.


  • AF
  • MIMO
  • MMSE
  • MSE-decomposition
  • Survey
  • performance analysis
  • relay
  • robust design
  • transceiver design

ASJC Scopus subject areas

  • General Computer Science
  • General Materials Science
  • General Engineering


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