Position change immune feature-based gesture recognition method

The invention discloses a gesture coding and recognition method based on CSI (Channel State Information). The gesture coding and recognition method specifically comprises the following steps: establishing a gesture recognition system based on a channel state information signal to collect and process CSI data; obtaining signal data of an optimal subcarrier by using a subcarrier selection algorithm of improved principal component analysis; aiming at the fact that a gesture recognition system has immunity in various environmental influences, the gesture action is represented by adopting two characteristics of a gesture fragment number and a gesture moving direction change sequence; segmenting the gesture by adopting a sliding window algorithm of a dynamic threshold value to accurately obtain the number of finger moving fragments; according to the method, the change of the gesture moving direction and angle is accurately extracted by utilizing a gesture fragment angle extraction method of dynamic phase change, fi