Patent ID: 7532692

Claim:
A wired/wireless communication receiver comprising: a delay spread estimation unit estimating a delay spread value of a received signal and using a symbol boundary information signal to determine a filtering tap length value and a filtering step size value from an estimated delay spread value, wherein the delay spread estimation unit comprises: a Channel Impulse Response (CIR) estimator estimating impulse response sizes, which are averaged for a predetermined number of symbols by delay time, from the received signal using the symbol boundary information signal; a delay spread calculator determining the delay spread value using the impulse response sizes averaged for the predetermined number of symbols, wherein the delay spread calculator determines the delay spread value from the following expressions: E ⁡ [ τ ] = ∑ k ⁢ a k 2 ⁢ τ k ∑ k ⁢ a k 2 , E ⁡ [ τ 2 ] = ∑ k ⁢ a k 2 ⁢ τ k 2 ∑ k ⁢ a k 2 , and ⁢ ⁢ σ τ = E ⁡ [ τ 2 ] - ( E ⁡ [ τ ] ) 2 , where E[ ] is a mean, k is a delay time sequence index, τ k is the delay time, a k is an impulse response size averaged for N symbols at τ k , and σ τ is the estimated delay spread value; and a decision unit determining the filtering tap length value and the filtering step size value from the delay spread value; a factor updating unit updating filtering factors using the filtering tap length value and the filtering step size value; and an equalizer compensating distortion of the received signal using the filtering factors.