4.7 Article

Index Modulation Aided Uplink NOMA for Massive Machine Type Communications

Journal

IEEE WIRELESS COMMUNICATIONS LETTERS
Volume 9, Issue 12, Pages 2159-2162

Publisher

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LWC.2020.3015920

Keywords

Index modulation (IM); non-orthogonal multiple access (NOMA); single-carrier frequency-division multiple access (SC-FDMA); massive machine-type communications (mMTC)

Funding

  1. Australian Research Council [DP180100606]
  2. TUBITAK [218E035]

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Single-carrier frequency-division multiple access (SC-FDMA) based index modulation (IM), referred here as SC-IM, allows users to implicitly transmit a part of their data bits by switching on some of their allocated subcarriers, followed by M-ary constellation symbols transmission over the activated subcarriers. This sparse use of subcarriers provides better energy efficiency and error rate. Using these benefits, this letter exploits SC-IM with uplink power domain non-orthogonal multiple access (NOMA), where all users with the same allocated subcarrier set can simultaneously transmit their SC-IM data with different power levels, which are exploited by the receiver to perform multi-user detection. Performance of the proposed technique is analyzed and compared with conventional NOMA. It is shown that the proposed scheme can achieve energy efficient massive connectivity, which is a primary requirement for massive machine-type communications.

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