Patent ID: 8254434

Claim:
A method for estimating a signal-to-noise ratio (SNR) of a wireless mobile communication system, comprising: estimating noise by using adjacent received signals of at least two adjacent subcarriers and received signals of subcarriers; calculating noise power by calculating a mean square value of the estimated noise by summing squares of the estimated noise; calculating a mean square value of the received signals by summing squares of the received signals; calculating signal power by subtracting the noise power from the mean square value of the received signals; and calculating the SNR using the signal power and the noise power, wherein estimating the noise includes: deriving components of adjacent received signals from adjacent received signals of adjacent subcarriers; and subtracting the components of the adjacent received signals from received signals of subcarriers, wherein the subcarriers are sck, the received signals are yk, the adjacent subcarriers are sck−1 and sck+1, and the adjacent received signals are yk−1 and yk+1, and wherein the noise power is calculated using a first expression: N pow = 2 3 ⁢ ( N - 2 ) ⁢ ∑ k ⁢ ⁢  y k - 1 2 ⁢ ( y k - 1 + y k + 1 )  2 , where N pow denotes the noise power, and ⅔ denotes a scaling down value.