Method for realizing splitting-rate multi-access of mobile cell-free massive MIMO system

A method for realizing rate-splitting multi-access in a mobile cell-free massive MIMO system, comprising:

• splitting, by an access point in the mobile cell-free massive MIMO system, the data of each user into two parts with a common message and a private message, coding all the common message into one super common message stream, and coding each piece of the private message into a private message stream;
• determining, by the access point, a power splitting ratio between the common message and the private message based on large-scale channel state information;
• coding, by the access point, the private message stream using an arbitrary linear pre-coding method, solving, by the access point, the problem of maximizing the minimum common message rate of users using bisection-based iterative optimization to obtain an optimal pre-coding method for the super common message stream, and coding the super common message stream using the optimal pre-coding method;
• sending, by the access point, the final coded super common message streams to user terminals after superimposing the final coded super common message stream on the private message stream;
• first decoding, by the user terminal, the super common message stream, removing the super common message stream using successive interference cancellation technology, and then decoding the private message stream.