Patent ID: 7260374

Claim:
A method for controlling a power level of a received signal in an ultra wide-band transmission system which uses multi frequency bands, and includes a pre-gain controller (PGC) and a voltage gain amplifier (VGA), the method comprising the steps of: a) at the PGCs, detecting which multi frequency band is used in a transmitter of the transmission system; b) at the PGCs, obtaining the voltage gain owing to the discrepancy in the power levels of the received signals; and c) at the PGCs, compensating for the power loss based on the voltage gain, wherein the voltage gain (G) acquired by the PGCs is expressed as: G = ∫ B 1 ⁢ P 1 ⁡ ( f ) ❘ H 1 ⁡ ( f ) ⁢ ❘ 2 ⁢ ⅆ f ∫ B i ⁢ P i ⁡ ( f ) ⁢  H i ⁡ ( f )  2 ⁢ ⅆ f where B i denotes the i th frequency band in use for transmission; P i (f), the PSD on the i th frequency band; H i (f), a channel transfer function on the i th frequency band.