Patent ID: 7472025

Claim:
An energy detection apparatus, comprising: an absolute value extractor for receiving a plurality of sampled values in sequence and outputting the absolute values after taking the absolute values of the sampled values; a first adder coupled to the absolute value extractor for adding a first computational intermediate value to the output of the absolute value extractor and outputting the value; a first flip-flop coupled to the first adder for outputting the output from the first adder according to a first clock signal to obtain an energy detection value, wherein the period of the first clock signal is T 1 ; a second adder coupled to the first flip-flop and the first adder for subtracting a sample-averaged value from the energy detection value and outputting the first computational intermediate value; and an algorithmic unit coupled to the absolute value extractor and the second adder for computing an average value of all the outputs from the absolute value extractor within any period of a second clock signal to obtain the sample-averaged value; wherein the period of the second clock signal is T 2 , and T 2 =T 1 *k where k is a natural number.