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Multidimensional Index Modulations (IM) are a novel alternative toconventional modulations which can bring considerable benefits for futurewireless networks. Within this scope, in this paper we present a new scheme,named as Precoding-aided Transmitter side Generalized Space-Frequency IndexModulation (PT-GSFIM), where part of the information bits select the activeantennas and subcarriers which then carry amplitude and phase modulatedsymbols. The proposed scheme is designed for multiuser multiple-inputmultiple-output (MU-MIMO) scenarios and incorporates a precoder which removesmultiuser interference (MUI) at the receivers. Furthermore, the proposedPT-GSFIM also integrates signal space diversity (SSD) techniques for tacklingthe typical poor performance of uncoded orthogonal frequency divisionmultiplexing (OFDM) based schemes. By combining complex rotation matrices (CRM)and subcarrier-level interleaving, PT-GSFIM can exploit the inherent diversityin frequency selective channels and improve the performance without additionalpower or bandwidth. To support reliable detection of the multidimensionalPT-GSFIM we also propose three different detection algorithms which can providedifferent tradeoffs between performance and complexity. Simulation resultsshows that proposed PT-GSFIM scheme, can provide significant gains overconventional MU-MIMO and GSM schemes.

A Generalized Space-Frequency Index Modulation Scheme for Downlink MIMO Transmissions with Improved Diversity