An FFT Core for DVB-T/DVB-H Receivers

Table 2

Arithmetic operators.

	Input bitwidth	Output bitwidth	Quantity per module	Quantity in the core
Adders (B1)	dbw	dbw	2	2⋅ceil(log4𝑁max)
Subtractors (B1)	dbw	dbw	2	2⋅ceil(log4𝑁max)
Adders (B2)	dbw	dbw	2	2⋅floor(log4𝑁max)
Subtractors (B2)	dbw	dbw	2	2⋅floor(log4𝑁max)
Multipliers (CM)	dbw and tbw	dbw+tbw	4	4⋅ceil(log4𝑁max−1)
Adders (CM)	dbw+tbw	dbw	1	ceil(log4𝑁max)−1
Subtractors (CM)	dbw+tbw	dbw	1	ceil(log4𝑁max)−1