Patent ID: 8121216

Claim:
A channel estimation device that converts a single carrier signal into a frequency domain signal and estimates channel characteristics through frequency domain signal processing, comprising: a ZF calculation/clipping processing section that uses a signal obtained by converting a pilot code into a frequency domain to calculate a pilot reference signal according to a Zero Forcing (ZF) method and clips the gain of the calculated pilot reference signal to a predetermined value to generate a clipped pilot reference signal; and a correlation processing section that performs correlation between a pilot reception signal in the frequency domain and the clipped pilot reference signal to estimate channel characteristics of the frequency domain wherein the ZF calculation/clipping processing section generates a pilot reference X(m) of a sub-carrier m such that the following equations are satisfied: X ⁡ ( m ) = G ⁡ ( m ) ⁢ C ⁡ ( m ) G ⁡ ( m ) = { 1  C ⁡ ( m )  2 1  C ⁡ ( m )  2 < G TH G TH 1  C ⁡ ( m )  2 ≥ G TH where m (1≦m≦N FFT : N FFT is an integer equal to or more than 2 and power of 2) is a sub-carrier number, C(m) is a signal of the sub-carrier m, obtained by converting the pilot code into the frequency domain, G(m) is the gain of the clipped pilot reference signal, X(m) is the clipped reference pilot signal, and G TH is a predetermined value of the clipping.