Studies on Z-Window Based FIR Filters

Table 3

Comparative performance of LPF.

S. no.	Type of filter	Number of dips, 𝐿	Position of dips	Filter order, 𝑁	Desired; 𝐴𝑝 (dB)	Desired; 𝐴𝑠 (dB)	Transition band	FESBA; (dB)
1	ZWF	1	𝐷𝑝	23	1.5	23	0.0497	−36.59
	ZWF	1	N/2	23	1.5	23	0.0770	−74.28
	KWF	—	—	11	1.5	23	0.0861	−29.01
	KWF (𝑁𝑧)	—	—	23	1.5	23	0.0652	−57.20
2	ZWF	2	𝐷𝑝	51	0.1	50	0.0624	−60.29
	ZWF	2	N/2	51	0.1	50	0.0891	−133.1
	KWF	—	—	31	0.1	50	0.0934	−78.97
	KWF (𝑁𝑧)	—	—	51	0.1	50	0.0818	−104.4
3	ZWF	3	𝐷𝑝	77	0.01	74	0.0712	−86.85
	ZWF	3	N/2	77	0.01	74	0.0892	−185.9
	KWF	—	—	47	0.01	74	0.0988	−105.4
	KWF (𝑁𝑧)	—	—	77	0.01	74	0.0824	−145.2

ZWF: ZW based LPF; KWF: KW based LPF.
KWF (𝑁_𝑧): KW based filter with order of ZWF.