Code-Index Modulation Aided Quadrature Spatial Modulation for High-Rate MIMO Systems

Aydın E. , Cogen F., Basar E.

IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY, vol.68, pp.10257-10261, 2019 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 68
  • Publication Date: 2019
  • Doi Number: 10.1109/tvt.2019.2928378
  • Page Numbers: pp.10257-10261
  • Keywords: Modulation, Receivers, MIMO communication, Indexes, Transmitting antennas, Detectors, Quadrature spatial modulation, code index modulation, MIMO systems, and direct sequence spread spectrum


In this correspondence paper, a novel code-index modulation (CIM) aided quadrature spatial modulation (QSM) scheme, called CIM-QSM, is proposed for highly spectrum and energy efficient multiple-input multiple-output (MIMO) systems. The CIM-QSM scheme transmits information over three different transmit entities: modulated symbols, activated antenna indices, and spreading code indices. Hence, a higher efficiency in terms spectrum and energy use, and better error performance compared to the conventional direct sequence spread spectrum, spatial modulation (SM), QSM, and CIM aided SS (CIM-SS) schemes are obtained by the CIM-QSM technique for MIMO communication systems. Analytical expressions for the average bit error rate, energy efficiency, and throughput of the CIM-QSM system are performed and the theoretical results are validated with Monte Carlo simulation results.