Table 3.

Table summarizing the back-scattered signal features/parameters set evaluated in this study.

Type	Group	Number	Feature/Parameter
Time Domain	Time Domain Statistics	1	Mean (M)
		2	Standard Deviation (SD)
		3	Root Mean Square (RMS)
		4	Skewness (Skew)
		5	Kurtosis (Kurt)
		6	Interquartile Range (IQR)
		7	Entropy ( E )
	Time Domain Histogram	8	${\mu }_{Nakagami}$
		9	${\omega }_{Nakagami}$
Frequency Domain	Discrete Cosine Transform (DCT)	10	1st Coefficient ($E_{DCT}\left[l^1\right]$)
		11	2nd Coefficient ($E_{DCT}\left[l^2\right]$)
		12	3rd Coefficient ($E_{DCT}\left[l^3\right]$)
		13	4th Coefficient ($E_{DCT}\left[l^4\right]$)
		14	5th Coefficient ($E_{DCT}\left[l^5\right]$)
		15	6th Coefficient ($E_{DCT}\left[l^6\right]$)
		16	7th Coefficient ($E_{DCT}\left[l^7\right]$)
		17	8th Coefficient ($E_{DCT}\left[l^8\right]$)
		18	9th Coefficient ($E_{DCT}\left[l^9\right]$)
		19	10th Coefficient ($E_{DCT}\left[l^{10}\right]$)
		20	11th Coefficient ($E_{DCT}\left[l^{11}\right]$)
		21	12th Coefficient ($E_{DCT}\left[l^{12}\right]$)
		22	13th Coefficient ($E_{DCT}\left[l^{13}\right]$)
		23	14th Coefficient ($E_{DCT}\left[l^{14}\right]$)
		24	15th Coefficient ($E_{DCT}\left[l^{15}\right]$)
		25	16th Coefficient ($E_{DCT}\left[l^{16}\right]$)
		26	17th Coefficient ($E_{DCT}\left[l^{17}\right]$)
		27	18th Coefficient ($E_{DCT}\left[l^{18}\right]$)
		28	19th Coefficient ($E_{DCT}\left[l^{19}\right]$)
		29	20th Coefficient ($E_{DCT}\left[l^{20}\right]$)
		30	Number of coefficients that capture 98% of the original signal ($N_{DCT}$)
		31	Total spectrum Area Under Curve (AUC) ($AU{C}_{DCT}$)
		32	Maximum peak amplitude ($Pea{k}_{DCT}$)
		33	Total spectral power ($P_{DCT}$)
	Wavelet Packet Decomposition	34	Haar Relative Power 1st level ($E_{Haar}^1$)
		35	Haar Relative Power 2nd level ($E_{Haar}^2$)
		36	Haar Relative Power 3rd level ($E_{Haar}^3$)
		37	Haar Relative Power 4th level ($E_{Haar}^4$)
		38	Haar Relative Power 5th level ($E_{Haar}^5$)
		39	Haar Relative Power 6th level ($E_{Haar}^6$)
		40	Db10 Relative Power 1st level ($E_{Db10}^1$)
		41	Db10 Relative Power 2nd level ($E_{Db10}^2$)
		42	Db10 Relative Power 3rd level ($E_{Db10}^3$)
		43	Db10 Relative Power 4th level ($E_{Db10}^4$)
		44	Db10 Relative Power 5th level ($E_{Db10}^5$)
		45	Db10 Relative Power 6th level ($E_{Db10}^6$)