| 摘要 |
PROBLEM TO BE SOLVED: To estimate a noise component included in a local signal and to improve a data transmission characteristic.SOLUTION: A mixer multiplies a reception signal by a local signal to frequency convert into an upconvert signal and a downconvert signal. A band pass filter eliminates the upconvert signal. An adder changes a local signal frequency fed from a local oscillator, to multiplex with the downconvert signal. An A/D converter converts the multiplexed signal of the downconvert signal with the local signal, from an analog signal to a digital signal. A local noise estimation unit separates the local signal fed from the local oscillator from the digitized multiplexed signal of the local signal fed from the local oscillator with the downconvert signal, to estimate a noise component. A noise correction unit corrects the reception signal on the basis of the estimated noise component of the local signal. |
