The commercial fifth-generation (5G) wireless communications networks have already been
deployed with the aim of providing high data rates. However, the rapid growth in the number …

In this treatise, we provide an interdisciplinary survey on spatial modulation (SM), where
multiple-input multipleoutput microwave and visible light, as well as single and multicarrier …

Reconfigurable intelligent surfaces (RISs) are an emerging transmission technology for
application to wireless communications. RISs can be realized in different ways, which …

Spatial modulation (SM) is an innovative and promising digital modulation technology that
strikes an appealing tradeoff between spectral efficiency and energy efficiency with a simple …

What is index modulation (IM)? This is an interesting question that we have started to hear
more and more frequently over the past few years. The aim of this paper is to answer this …

The intelligent information society, which is highly digitized, intelligence inspired, and
globally data driven, will be deployed in the next decade. The next 6G wireless …

Index modulation concept has attracted considerable research interest in the past few years.
As a realization of index modulation in the frequency domain, orthogonal frequency division …

Index modulation (IM) provides a novel way for the transmission of additional data bits via
the indices of the available transmit entities compared with classical communication …

Multiple-mode orthogonal frequency division multiplexing with index modulation (MM-OFDM-
IM), which transmits an OFDM signal with information bits embedded onto multiple …

Sixty years of coherent versus non-coherent tradeoff as well as the twenty years of coherent
versus non-coherent tradeoff in Multiple-Input Multiple-Output (MIMO) systems are surveyed …