Spatial Modulation in the Presence of I/Q Imbalance: Optimal Detector & Performance Analysis

Canbilen A. E., Alsmadi M. M., Başar E., Ikki S. S., GÜLTEKİN S. S., DEVELİ I.

IEEE COMMUNICATIONS LETTERS, vol.22, no.8, pp.1572-1575, 2018 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 22 Issue: 8
  • Publication Date: 2018
  • Doi Number: 10.1109/lcomm.2018.2836448
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.1572-1575
  • Istanbul Technical University Affiliated: Yes


Spatial modulation (SM) is affected by the impacts of in-phase and quadrature-phase imbalance (IQI), which cause degradation of system performance in practical terms. To address this concern, an optimal maximum likelihood detector is proposed for SM-based transmission and the system performance is analyzed by computer simulations and analytical derivations. In addition, this optimal receiver is compared with a non-optimal receiver. Specifically, pairwise and average hit error probabilities are derived for the optimal detector. The results prove that IQI is a critical issue for SM-based transmission and the proposed optimal receiver significantly enhances the SM system performance in the presence of IQI.