Improved multi-relay set selection method based on hybrid decoding amplification forwarding

The invention relates to the technical field of digital communication, in particular to an improved multi-relay set selection method based on hybrid decoding amplification forwarding, which comprises the following steps: step 1, source node information broadcasting: step 1.1, taking information bits needing to be transmitted as input parameters, and executing a channel polarization coding method through a source node to obtain coded code words; step 1.2, taking the code word as an input parameter, executing a channel coding modulation method through a source node to obtain a transmitting signal, and broadcasting the transmitting signal to each relay and a destination node in a free space by a transmitting antenna; and step 2, relay node set classification: taking receiving signals of each relay and a destination node as input parameters, and executing calculation according to a relay node set classification method to obtain a decoding forwarding relay set and an amplification forwarding relay set. And step 3,