Patent ID: 8503563

Claim:
A receiver of a wireless communication system, the receiver comprising: at least one receive antenna; a cyclic prefix (CP) remover configured to remove a CP from a signal received through the at least one receive antenna; a channel selectivity estimator configured to select a candidate channel phase value from a candidate channel phase set including a plurality of candidate channel phase values and feedback the selected candidate channel phase value to a transmitter, wherein the selected candidate channel phase value has the greatest correlation with respect to an equivalent channel along a path from each transmit antenna to the at least one receive antenna; a fast Fourier transform (FFT) unit configured to transform a time-domain symbol into a frequency-domain symbol by performing FFT; a demapper configured to demap the frequency-domain symbol to coded data; and a channel decoder configured to decode the coded data according to a predetermined decoding scheme, wherein the channel selectivity estimator is disposed in a front stage of the FFT unit and after the CP remover to obtain the selected candidate channel phase value in a time domain, and wherein when a number of the at least one receive antenna is more than one, a correlation of the selected candidate channel phase value and the equivalent channel represented in the time domain along a path from a j th transmit antenna to an i th receive antenna is determined based on the equation: ∫ T s h ij ( n )* e jθ m G n dn=∫ T s (∥ h ij ( n )∥· e jθ ij n )* e jθ m G n dn={tilde over (h)} ij ≈j ij where i=1, . . . , Nr, j=1, . . . , Nt, m=1, . . . , M, M denotes a number of candidate channel phase values, h ij denotes the equivalent channel represented in the time domain along the path from the j th transmit antenna to the i th receive antenna, Nr denotes a number of the at least one receive antenna, Nt denotes a number of the transmit antennas, φ ij denotes a phase value of the equivalent channel along the path from the j th transmit antenna to the i th receive antenna, θ m G denotes an m th candidate channel phase value stored in the channel selectivity estimator, and Ts denotes a sampling duration.