Input circuit and semiconductor integrated circuit comprising the input circuit

An equalization device that converts a single carrier signal into a frequency domain signal and performs equalization processing 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;
• a correlation processing section that performs correlation between a pilot reception signal in the frequency domain and clipped pilot reference signal to estimate channel characteristics of the frequency domain;
• a weight calculation section that calculates an equalization weight based on the channel characteristics of the frequency domain;
• and
• an equalization filter that performs equalization processing of a frequency domain reception signal using the equalization weight.

A channel estimation method that converts a single carrier signal into a frequency domain signal and estimates channel characteristics through frequency domain signal processing, comprising:

• calculating a pilot reference signal according to a Zero Forcing (ZF) method by using a signal obtained by converting a pilot code into a frequency domain;
• clipping the gain of the calculated pilot reference signal to a predetermined value to generate a clipped pilot reference signal;
• and
• performing correlation between a pilot reception signal in the frequency domain and clipped pilot reference signal to estimate channel characteristics of the frequency domain.

An equalizing method that converts a single carrier signal into a frequency domain signal and performs equalization processing through frequency domain signal processing, comprising:

• calculating a pilot reference signal according to a Zero Forcing (ZF) method by using a signal obtained by converting a pilot code into a frequency domain;
• clipping the gain of the calculated pilot reference signal to a predetermined value to generate a clipped pilot reference signal;
• performing correlation between a pilot reception signal in the frequency domain and clipped pilot reference signal to estimate channel characteristics of the frequency domain;
• calculating an equalization weight based on the channel characteristics of the frequency domain;
• and
• performing equalization processing of a frequency domain reception signal using the equalization weight.