Patent ID: 7970083

Claim:
A method for using a wireless signal in a wireless communication system, said method comprising: receiving a wireless signal in a hardware-enabled receiver; determining an impulse response of the received wireless signal using said receiver; determining an auto-correlation function (ACF) value of said impulse response of said received wireless signal using said receiver, wherein said ACF value is determined by utilizing: A ⁢ ⁢ C ⁢ ⁢ F ⁡ ( l ) = ∑ n ⁢ h ⁡ ( n ) ⁢ h * ( l - n )  h ⁡ ( n )  , wherein l is a symbol interval, ACF(l) is said autocorrelation function of said impulse response with a lag of l, h(n) is said impulse response of said received wireless signal at time interval n, and h*(l−n) is a complex conjugate of said impulse response h(n); determining a power spectrum density of said received wireless signal based on said ACF value using said receiver, wherein said power spectrum density function is determined by utilizing: PSD ⁡ ( k ) = FFT ⁡ ( A ⁢ ⁢ C ⁢ ⁢ F ⁡ ( l ) ) = ∑ l = - 64 64 ⁢ A ⁢ ⁢ C ⁢ ⁢ F ⁡ ( l ) ⁢ ⅇ - j2π ⁢ ⁢ lk , wherein k is a frequency band of said received wireless signal, and wherein said FFT is a Fast Fourier Transform; and selecting an algorithm for performing demodulation of said received wireless signal by utilizing the determined power spectrum density.