On the Achievable Rate of OFDM with Index Modulation

Miaowen Wen, Xiang Cheng, Meng Ma, Bingli Jiao, H. Vincent Poor

Research output: Contribution to journalArticlepeer-review

233 Scopus citations


Orthogonal frequency division multiplexing with index modulation (OFDM-IM) is a recently developed transmission technique that extends the principle of spatial modulation to OFDM subcarriers. In this paper, the performance of OFDM-IM is studied in terms of the achievable rate assuming an M-ary constellation and that channel state information is available at the receiver. A closed-form lower bound is derived, based on which an interleaved grouping method is proposed for the use of subcarriers. In comparison with the existing grouping method, the proposed one can better benefit from the diversity effects over frequency-selective fading channels, especially when the spacing of any two subcarriers within a subcarrier group is larger than the coherence bandwidth. Through numerical results, it is revealed that OFDM-IM with interleaved grouping outperforms classical OFDM for small M and certain ranges of signal-to-noise ratio. Finally, the effects of modulation types on the performance of OFDM-IM are studied. It is found that the superiority of OFDM-IM over classical OFDM is greater for phase-shift keying than for quadrature amplitude modulation.

Original languageEnglish (US)
Article number7330022
Pages (from-to)1919-1932
Number of pages14
JournalIEEE Transactions on Signal Processing
Issue number8
StatePublished - Apr 15 2016

All Science Journal Classification (ASJC) codes

  • Signal Processing
  • Electrical and Electronic Engineering


  • Achievable rate
  • OFDM
  • capacity
  • index modulation
  • spatial modulation


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