Receiver with a frequency offset correcting function

A receiver with a frequency offset correcting function comprising:

• a frequency offset correcting means for receiving a received signal as well as a frequency-offset estimated value and correcting phase rotation due to frequency offset of said received signal according to said frequency-offset estimated value;
• a first channel impulse response estimating means for estimating channel impulse response value at a first position of said corrected received signal according to a known training sequence included in the received signal corrected by said frequency offset correcting means;
• a determining means for determining the received signal corrected by said frequency offset correcting means;
• a second channel impulse response estimating means for estimating channel impulse response value at a second position apart from said first position of said corrected received signal by updating said channel impulse response estimated value at the first position according to the received signal corrected by said frequency offset correcting means, said channel impulse response estimated value at the first position thereof estimated by said first channel impulse response estimating means, and to the value determined by said determining means;
• and
• a frequency-offset estimated value computing means for computing a frequency-offset estimated value of said received signal according to said channel impulse response estimated value at the first position thereof estimated by said first channel impulse response estimating means as well as to said channel impulse response estimated value at the second position thereof estimated by said second channel impulse response estimating means, and outputting the computed value to said frequency offset correcting circuit;
• wherein
• said determining means determines the received signal corrected by said frequency offset correcting means, for a first time according to said channel impulse response estimated value at the first position thereof estimated by said first channel impulse response estimating means, and determines the received signal corrected by said frequency offset correcting means, after the first time, according to a value updated from said channel impulse response estimated value at the first position thereof by said second channel impulse response estimating means.

A receiver with a frequency offset correcting function comprising:

• a first channel impulse response estimating means for estimating channel impulse response value at a first position of said received signal according to a known training sequence included in the received signal;
• a determining means for determining the received signal according to said channel impulse response estimated value at the first position thereof estimated by said first channel impulse response estimating means;
• a second channel impulse response estimating means for estimating channel impulse response value at a second position apart from said first position of said received signal according to the received signal, said channel impulse response estimated value at the first position thereof estimated by said first channel impulse response estimating means, and to the value determined by said determining means;
• a frequency-offset estimated value computing means for computing a frequency-offset estimated value of said received signal according to said channel impulse response estimated value at the first position thereof estimated by said first channel impulse response estimating means as well as to said channel impulse response estimated value at the second position thereof estimated by said second channel impulse response estimating means;
• and
• a local oscillator correcting means for correcting a frequency from a local oscillator according to the frequency-offset estimated value computed by said frequency-offset estimated value computing means.

A receiver with a frequency offset correcting function comprising:

• a frequency offset correcting means for receiving a plurality of received signals as well as frequency-offset estimated value, and correcting each phase rotation due to frequency offset for said plurality of received signals according to said frequency-offset estimated value respectively;
• a first channel impulse response estimating means for estimating each channel impulse response at a first position of said plurality of corrected received signals according to each known training sequence included in said plurality of received signals corrected by said frequency offset correcting means;
• a determining means for determining said plurality of received signals corrected by said frequency offset correcting means according to said channel impulse response estimated values each at the first position thereof estimated by said first channel impulse response estimating means;
• a second channel impulse response estimating means for estimating each channel impulse response at a second position apart from the first position of the plurality of corrected received signals according to said plurality of received signals corrected by said frequency offset correcting means, each channel impulse response estimated value at the first position of said plurality of corrected received signals estimated by said first channel impulse response estimating means, and to the value of said plurality of received signals determined by said determining means;
• and
• a frequency-offset estimated value computing means for computing frequency-offset estimated value of said plurality of received signals according to each channel impulse response estimated value at the first position thereof estimated by said first channel impulse response estimating means as well as to each channel impulse response estimated value at the second position thereof estimated by said second channel impulse response estimating means, and outputting the computed value to said frequency offset correcting circuit.