Modulation Design for Two-Way Amplify-and-Forward Relay HARQ

Wenhao Wu, Hans Mittelmann, Zhi Ding

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


As a practical technique for enhancing relay and HARQ transmissions, modulation diversity (MoDiv) uses distinct constellation mappings for data retransmissions. In this work, we study the MoDiv optimization in a amplify-and-forward (AF) two-way relay channel (TWRC). The design of MoDiv to minimize the bit-error rate (BER) is formulated into a successive Koopmans-Beckmann quadratic assignment problem (QAP), which is solved sequentially with a robust tabu search method. The performance gain of our MoDiv scheme over retransmission without remapping and a heuristic MoDiv scheme is demonstrated with numerical results.

Original languageEnglish (US)
Article number7407322
Pages (from-to)244-247
Number of pages4
JournalIEEE Wireless Communications Letters
Issue number3
StatePublished - Jun 2016


  • 2-way relay
  • HARQ
  • Modulation diversity
  • QAP

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Electrical and Electronic Engineering


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