A new approach of interference alignment through asymmetric complex signaling and multiuser diversity

Hun Young Shin, Seok Hwan Park, Haewook Park, Inkyu Lee

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)


In this letter, we consider a new interference alignment (IA) strategy for single-input single-output interference broadcast channels with constant channel coefficients. First, we show that 1.5 degrees of freedom (DOF) is achievable for 3-cell case by utilizing asymmetric complex signaling (AC) and multiuser diversity without symbol extension. It is also investigated that the achievable DOF varies with the user scaling condition and ω(√SNR}) is required for guaranteeing the DOF of 1.5. To improve the sum-rate performance, user scheduling algorithms combined with the beamforming techniques are suggested which outperform the conventional IA schemes. After introducing an exhaustive scheduling algorithm which shows optimal sum-rate, a simplified scheduling method is also proposed which reduces both scheduling metric computations and the search size.

Original languageEnglish
Article number6123783
Pages (from-to)880-884
Number of pages5
JournalIEEE Transactions on Wireless Communications
Issue number3
Publication statusPublished - 2012 Mar

Bibliographical note

Funding Information:
This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MEST) (No. 2010-0017909). The material in this paper was presented in part at IEEE Globecom, Dec. 2010.


  • Interference alignment
  • asymmetric complex signaling
  • multiuser diversity

ASJC Scopus subject areas

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


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