A Framework for Human Activity Recognition Based on WiFi CSI Signal Enhancement

Algorithm 3

P-signal enhancement.

	Input: Sij—the sequential data of i-th subcarrier and j-th antenna for CSI signal
	W—the size of sliding window
	step—the step size of window movement
	Output: SEij—the enhanced sequential data of i-th subcarrier and j-th antenna
	Step 1: N = the length of Sij
	Step 2: for (k = 0; k + W ≤ N; k = k + step)
	Step 3: ST = Ø
	Step 4: calculate formula (6) () based on sequential data in sliding window from Sij
	Step 5: append to ST
	Step 6: end
	Step 7: SEij = ST
	Step 8: return SEij