What question did this study set out to answer?

The aim is to explore novel index modulation techniques for enhancing vehicular communications.

Multidomain Index Modulation for Vehicular and Railway Communications: A Survey of Novel Techniques

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Survey highlights index modulation applications in vehicular and railway communications, suggesting future research directions.

The aim is to explore novel index modulation techniques for enhancing vehicular communications.
Review of index modulation principles and applications across various communication systems.
Discussion on the implications of high-Doppler spread in vehicular communication environments.
Identification of design challenges specific to index modulation in vehicular communications.
Index modulation significantly increases robustness in vehicular communication systems under high mobility conditions.
The use of sparse transmission reduces detection complexity in vehicle-to-vehicle and vehicle-to-infrastructure communications.
Various applications across railway and high-speed train systems illustrate the versatility of index modulation.

Yang et al. (2018) studied this question.

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