Figure 1
The diagram illustrates a C N O M A system with space-time block coding transmission. A source node with two transmit antennas labelled S subscript x one and S subscript x two sends signals x one and x two over multiple channels to a relay and a destination Internet of Things device. Channel gains between source and relay are labelled h one and h two, and between source and destination are labelled h three and h four. The relay contains two receive antennas labelled R subscript x one and R subscript x two, and forwards signals x one and x two through channels h five and h six to the destination. Dashed lines indicate direct links from source to destination, and separate dashed paths indicate cooperative links through the relay.A CNOMA system with STBC transmission scheme