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.

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 a receiving method and device for a non-orthogonal multiple access transmission system. The method comprises the following steps: obtaining total received signals of N users of a multiple access channel and multi-user transmission information required by the N users for demodulation and decoding; selecting N1 users from the N users, taking the received signals of other N-N1 users as interference to perform joint decoding for the N1 users in the total received signals to obtain a joint decoding result of the N1 users; recovering and subtracting the received signals of N1' users that are successfully decoded from the total received signals of the N users according to the joint decoding result of the N1 users, storing the total received signals of the remained N-N1' users, and setting that N is equal to N-N1'; repeatedly performing joint decoding until N1' is equal to N or the number K of executions of multi-level joint decoding reaches a preset threshold; and outputting a decoding result of successfully decoding the users in K multi-level joint decoding processes. By adopting the method disclosed by the invention, the complexity of multi-user reception can be effectively reduced, and the performance of multi-user reception can be increased.

Receiving method and device for non-orthogonal multiple access transmission system

Method for computing likelihoods in a process for reconstructing decoded information words from vectors of observations received from a wireless channel and generated from vectors of transmission symbols using a plurality of Alamouti matrix based Differential Space Time Block Codes coder. The method comprises applying an iterative reconstruction process, comprising, in a current iteration: receiving a vector of observations; determining, at least one vector of approximated scaling factors to be applied to the vector of observations; determining for each vector of approximated scaling factors a vector of approximated scaled equivalent channel models; and, computing likelihoods in the form of values representative of joint probabilities of obtaining the vector of observations knowing a vector of modulated symbols and a model of the wireless channel using each determined vector of approximated scaling factors and each determined vector of approximated scaled equivalent channel models.

Method for computing likelihoods in process for reconstructing decoded information words

Low-complexity adaptive transmission multi-antenna transmission method and system

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Low-complexity adaptive transmission multi-antenna transmission method and system