PERFORMANCE ANALYSIS OF SPATIAL MODULATION IN MIMO- A SURVEY
Spatial modulation (SM) is a recently developed transmission technique that uses index of antenna in a multiple input multiple output (MIMO) antenna system, as additional means of data transmissions. The use of index of the active antennas at any time instant is the main idea behind spatial modulation. The information bits to be transmitted are divided into two parts. The first part is mapped to a symbol chosen from the signaling constellation, where depending on modulation scheme the number of bits per symbol varies. The second part determines the antenna index to be selected from a set of antennas available for data transmission. Thereby increases the spectral efficiency and decreases the complexity at receiver section. The rate of data transmission can much more increased by mapping into subsets of antennas in MIMO. The paper summarizes some of the recent works and issues of SM MIMO. The antenna selection in spatial modulation mainly depends on the incoming information data which is unlike the antenna selection in conventional MIMO system which depends on the channel state information (CSI) and the received signal strength.