Equiprobable Subcarrier Activation Method for OFDM With Index Modulation

Wen M., ZHANG Y., LI J., Basar E. , CHEN F.

IEEE COMMUNICATIONS LETTERS, vol.20, no.12, pp.2386-2389, 2016 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 20 Issue: 12
  • Publication Date: 2016
  • Doi Number: 10.1109/lcomm.2016.2608350
  • Page Numbers: pp.2386-2389


Orthogonal frequency division multiplexing with index modulation (OFDM-IM) conveys additional information bits via the indices of active subcarriers. Consequently, the determination of the active subcarriers according to the incoming bits arises as a challenging problem. The existing solution resorts to the lexicographic ordering, which leads to a low implementation complexity but an unequal subcarrier activation probability. This letter proposes a distinct solution that allows the equiprobable activation of all OFDM-IM subcarriers with comparable implementation complexity. The signal-to-noise ratio gain achieved by the proposed solution is also analyzed. Computer simulations reveal the advantages of the proposed solution.