Multiuser superposition transmission method and multiuser superposition transmission device

The invention provides a multiuser superposition transmission method and a multiuser superposition transmission device. The method comprises steps: a transmitter carries out bit operation on a first group of to-be-transmitted 2m bits and a second group of to-be-transmitted 2n bits to obtain a third group of 2m bits, wherein m and n are positive integers; the transmitter carries out 2 -order modulation mode processing on the second group of bits to obtain second plural symbols, and the third group of bits is subjected to processing in a 2 -order modulation mode to obtain third plural symbols; the transmitter uses a square root of alpha to weight the second plural symbols to obtain second weighted plural symbols, and uses a square root of 1-alpha to weight the third plural symbols to obtain third weighted plural symbols; the transmitter adds the second weighted plural symbols and the third weighted plural symbols to obtain superposition symbols; and the transmitter forms the superposition symbols into transmission signals to be transmitted. Thus, effects that the robustness of a receiver for symbol-level SIC (Successive Interference Cancellation) can be enhanced through simple and unique design processing, and the access performance is enhanced in a lower-complexity receiver condition can be achieved.