Low-Complexity Inverse Square Root Approximation for Baseband Matrix Operations

Table 1

Estimated area in terms of GEs of arithmetic and logic units and LUTs in compared implementations.

(a)

Unit	Operands	GE
Inverter	1	0.75
XOR	1×1	2.25
Full adder	1×1×1	6.50
Adder	8×6	34.75
Adder	19×10	76.50
Adder	20×9	78.75
Multiplier	7×7	247.00
Multiplier	20×20	2047.00
Multiplier	22×23	2542.00
Multiplier	16×56	4254.50
Multiplier	56×56	14647.25
Multiplier	76×76	26590.00

(b)

LUT size	GE
108×16	488.50
2^9×6	505.50
216×8	593.75
2^9×8	670.25
2^9×10	872.00
2^7×36	943.50
2^9×19	2258.75
821×22	3720.50
2^10×23	4740.50
2^10×25	5065.50
2^11×23	9334.75