Patent ID: 7738544

Claim:
An apparatus for estimating a received signal strength indicator (RSSI) of a signal transmitted/received in a wireless network, the apparatus comprising: an analogue/digital converter (ADC) quantizing one of an I (In-phase)-branch signal and a Q (Quadrature)-branch signal into a digital signal, the I-branch and Q-branch signals being extracted from a signal received through the wireless network; an absolute value calculating unit calculating an absolute value of the digital signal quantized by the ADC and outputting a calculation result; an accumulate unit accumulating an output of the absolute value calculating unit for a given time period and outputting an accumulated result; a square unit squaring an output of the accumulate unit and outputting a squared result; and a multiply unit multiplying an output of the square unit by a given value and outputting a multiplied result, the given value being determined based on the number of input bits, an input clip level, and input resistance of the ADC when the probability density functions at input and output signals of the ADC are approximately Gaussian with zero mean.