This paper is aimed to provide a comprehensive review on the spectrally efficient transmission techniques applied in multiple antenna systems. Specifically, three state-of-the-art techniques which make use of the spatial domain to convey information bits, including the Vertical Bell-Labs Layered Space-Time (V-BLAST), the source-based spatial modulation (SM) and the media-based modulation (MBM), will be surveyed and their critical advantages as well as limitations will be highlighted. | Exploiting spatial domain to increase spectrum efficiency for wireless communications from source to media based modulation
