Estimation method for QAM constellation diagram rotation caused by frequency offset, storage medium and equipment

The invention discloses a method for estimating rotation of a QAM constellation diagram caused by frequency offset, a storage medium and equipment. The method comprises the following steps: mapping a received signal into an original quadrature amplitude modulation (QAM) constellation diagram in a complex plane, the original QAM constellation diagram comprising a group of signal data points; sequentially adopting a plurality of rotation angles to perform rotation angle compensation on the group of signal data points to obtain a plurality of groups of compensation data points, each group of compensation data points corresponding to a rotation QAM constellation diagram in a complex plane; calculating graph distances between a plurality of rotary QAM constellation diagrams corresponding to the plurality of groups of compensation data points and the theoretical QAM constellation diagram to obtain a plurality of graph distance values; and determining a rotation angle corresponding to the constellation diagram close