Patent ID: 7756498

Claim:
A channel estimator of a mobile communication terminal, the channel estimator comprising: an Integration and Dump (I&D) unit for receiving spread I and Q signals and summing spreading factors of the received I and Q signals; a coefficient changing unit for receiving the I and Q signals in which the spreading factors are summed, respectively, performing Infinite Impulse Response (IIR) filtering using pairs of preset coefficients, outputting channel prediction result values according to the used pairs of preset coefficients, comparing the channel prediction result values with a channel prediction value in which noise does not occur, and selecting and outputting optimized coefficient values, which are a pair of coefficients corresponding to a channel prediction result value having a smallest difference from the channel prediction result value; and an first Infinite Impulse Response (IIR) filter for receiving the I and Q signals in which the spreading factors are summed, respectively, receiving the optimized coefficients, and performing IIR filtering based on the received coefficient values in order to output a channel prediction value for the summed I and Q signals in which the spreading factors are summed, respectively.