Dependent on the input binary string, different number of active subcarriers are assigned to carry constellation symbols In OFDM-GIM2, independent index modulation is performed on the in-phase and quadrature component per subcarrier. Through such ways, a higher spectral efficiency than that of OFDM...
An ABLO-OFDM scheme based on composite MM-IM (CMM-IM) is proposed in IM/DD systems. Compared with the only subcarrier activation patterns (SAPs) in traditional IM, the index bits in CMM-IM include both SAPs and constellation activation patterns (CAPs), which can improve the SE. The ...
modulation-based asymmetrically clipped optical orthogonal frequency division multiplexing (SACO-OFDM) scheme for optical wireless communication (OWC) systems, which benefits from the subcarrier-index modulation (SIM) and asymmetrically clipped optical orthogonal frequency division multiplexing (ACO-OFDM) ...
It amalgamates the concept of Discrete Cosine Transform assisted Orthogonal Frequency Division Multiplexing (DCT-OFDM) and Index Modulation (IM) to exploit the design freedom provided by the double number of available subcarrier under the same bandwidth. In the proposed EDCT-OFDM-IM scheme, the ...