| 摘要 |
PURPOSE:To reduce the relative degradation amount of a carrier wave band noise power ratio (C/N) by correcting amplitude distortion by processing detected mutually orthogonal I and Q signals while using respectively relative signals in the demodulation circuit of multi-level orthogonal amplitude modulation (QAM). CONSTITUTION:The I input signal is double-wave rectified by a double-wave rectifier 1 and a signal, which amplitude is adjusted by an amplitude adjuster 2, is multiplied to the Q input signal by using a multiplier 6. Similarly, the Q input signal is double-wave rectified by a double-wave rectifier 4 and a signal, which amplitude is adjusted by an amplitude adjuster 5, is multiplied to the I input signal by using a multiplier 3. |
