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Journal Articles EURASIP Journal on Wireless Communications and Networking Year : 2023

In-phase and quadrature filter shape index modulation

Majed Saad
  • Function : Correspondent author
Hussein Hijazi
  • Function : Author
  • PersonId : 1089327
Jacques Palicot
  • Function : Author
  • PersonId : 831183


This paper proposes a novel modulation scheme called "In Phase and Quadrature-Filter Shape Index Modulation" (IQ-FSIM). It aims to enhance the spectral/energy efficiencies (SE/EE) while generalizing several existing modulations and index modulation (IM) domains. In this system, the bitstream is divided into three sub-streams. The first is mapped using amplitude-phase modulation, and the other two are mapped separately to an index of a filter shape at the in-phase and quadrature components. IQ-FSIM in SISO mode enhances the SE by 2 log(2) N (double FSIM gain), thanks to the independent indexation of N different filter shapes on each component changing at the symbol rate. A low-complexity matched filter-based detector that reaches the optimal joint ML performance is proposed. The theoretical lower bounds for the probability of filter index error and the symbol/bit error rate (SER/BER) are derived and validated. The computational complexity of the proposed IQ-FSIM transceiver is estimated and compared to its predecessor FSIM, where it is shown that IQ-FSIM provides up to 93.7% complexity reduction compared to FSIM along with different advantages. In addition, the results reveal that both IQ-FSIM and its special case FSIM, even with non-optimal filter shapes, outperform the equivalent schemes with/without IM of the same SE in AWGN, flat, and frequency-selective fading channels.
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Dates and versions

hal-04115151 , version 1 (02-06-2023)





Majed Saad, Ali Chamas Al Ghouwayel, Hussein Hijazi, Faouzi Bader, Jacques Palicot. In-phase and quadrature filter shape index modulation. EURASIP Journal on Wireless Communications and Networking, 2023, 2023 (1), pp.33. ⟨10.1186/s13638-023-02232-9⟩. ⟨hal-04115151⟩
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