Orthogonal transform error corrector
AssigneePanasonic Corporation
InventorsHiroki Mouri, Kouichi Nagano, Hiroyuki Tezuka
Life of this patent
Estimating the term…
Abstract
A phase adjuster arranges phases of waveforms of a complex signal after orthogonal transform. An edge detector detects an edge of the complex signal after phase adjustment. A phase shift detector detects phase shift of an output signal of the edge detector between the in-phase signal and the quadrature signal after the orthogonal transform, and outputs a phase error signal (PE). The oscillator connected to mixers and a shifter to perform the orthogonal transform includes a phase adjustment section adjusting an edge of a voltage controlled oscillator (VCO) clock based on the phase error signal (PE) and correcting the phase shift of an original signal.
Claims6
An orthogonal transform error corrector, comprising:
- an orthogonal transform section configured to separate an in-phase signal and a quadrature signal from a complex signal;
- a phase adjuster configured to arrange phases of waveforms after orthogonal transform;
- an edge detection section configured to detect an edge of the complex signal after phase adjustment;
- a phase shift detection section configured to detect phase shift of an output signal of the edge detection section;
- and
- a phase adjustment section configured to correct phase shift of an original signal based on a phase shift amount detected by the phase shift detection section.
Dependencies are inferred from the claim text.