Patent ID: 8520751

Claim:
A channel estimation apparatus of a wireless communication system, comprising: a channel estimation unit configured to estimate a channel coefficient of a channel between a transmitter and a receiver from a pilot-inserted carrier signal according to pilot arrangement; and a linear/nonlinear averaging unit linearly or nonlinearly averaging the estimated channel coefficient and preventing an equalizer performance from being degraded by noise component existing in the channel and noise amplification caused by deep fading, wherein the linear/nonlinear averaging unit linearly or nonlinearly averages the estimated channel coefficient based on Eq. 1 below, thereby preventing the equalizer performance from being degraded by the noise component existing in the estimated channel and the noise amplification caused by the deep fading H ^ ave = [ H ^ ave ⁡ ( 0 ) ⁢ H ^ ave ⁡ ( 1 ) ⁢ ⁢ … ⁢ ⁢ H ^ ave ⁡ ( N - 1 ) ] T ⁢ ⁢ = Fun ⁢ { H ^ ⁡ ( 0 ) ⁢ H ^ ⁡ ( 1 ) ⁢ ⁢ … ⁢ ⁢ H ^ ⁡ ( N - 1 ) } Eq . ⁢ 1 where Ĥ(=[Ĥ(0)Ĥ(1) . . . Ĥ(N−1)] T ) is the channel estimated by the channel estimation unit; Ĥ ave =[Ĥ ave (0)Ĥ ave (1) . . . Ĥ ave (N−1)] T is the channel linearly or nonlinearly averaged by the linear/nonlinear averaging unit; N represents the number of subcarriers of an OFDM symbol; and T represents a transpose.