Multi-user multi-carrier DCSK communication method and system based on sparse code multiple access

The invention discloses a multi-user multi-carrier DCSK communication method and system based on sparse code multiple access, and the method provided by the invention comprises the steps: superposing the code words of a plurality of users on subcarriers according to the number of users and the number of subcarriers of a DCSK system, and constructing a sparse codebook matrix; sending information symbols sent by a plurality of users are obtained, calculation is carried out based on the sparse mapping matrix through the sparse codebook matrix, and K-dimensional complex code words are obtained; performing chaotic signal modulation on the complex code word to obtain a sending modulation signal; according to the method provided by the invention, the non-orthogonal multiple access technology is considered, the complexity of the system after the sparse codebook multiple access technology is combined with the multi-user multi-carrier DCSK system is effectively reduced, the bit error rate performance ...