MIMO-SCMA (Multiple Input Multiple Output-Sparse Code Multiple Access) system uplink construction method based on V-BLAST (Vertical Bell Labs Layered Space-Time) coding way

The invention discloses an MIMO-SCMA (Multiple Input Multiple Output-Sparse Code Multiple Access) system uplink construction method based on a V-BLAST (Vertical Bell Labs Layered Space-Time) coding way, belongs to the field of multi-receiving and multi-transmission information transmission system construction, and aims to overcome the limitations of multi-user non-orthogonal and soft decoding ways in an original SCMA system and fuse an SCMA technology with an MIMO technology. The method comprises the following steps: setting two transmitting antennas for each user in an MIMO-SCMA system, deserializing an information bit sequence to be transmitted into two paths, performing convolutional coding at a 1/2 code rate respectively, and performing interleaving; performing SCMA mapping according to an SCMA codebook to obtain information to be transmitted by each user, and modulating the information transmitted by all the users onto subcarriers according to a mapping matrix F in order to finish modulation coding; and transmitting the information through the antennas, receiving the information passing through a channel by the two antennas of a base station, and performing a detection through a minimum mean square error method. The method has the advantages of high information transmission rate and high spectral efficiency.