Adaptive IR-HARQ transmission method and system of 5G polarization code

The invention discloses a self-adaptive IR-HARQ transmission method of a 5G polarization code. The method comprises the following steps: a sending end sends a polarization coding symbol; a receiving end carries out decoding based on the log-likelihood ratio of the polarization coded symbol; when the decoding result CRC verification is not passed, the receiving end feeds back a symbol bit needing to be retransmitted to the sending end at least once, so that the sending end intercepts a retransmission symbol from the punching bit every time and returns the retransmission symbol to the receiving end; when a receiving end receives a retransmission symbol, decoding based on the log-likelihood ratio of all received symbols; if the CRC verification of the decoding result is passed, transmission is completed; if the verification is not passed, feeding back the symbol digits needing to be retransmitted to the sending end again; wherein when the receiving end feeds back the symbol bits needing to be retransmitted to th