Phase correction circuit and phase correction method thereof

Abstract

The invention relates to a phase correction circuit which comprises at least one group of signal processing modules, at least two phase correction modules, a phase detection module and a filter module, wherein the output end of the first-phase correction module is coupled to the input ends of the first group of signal processing modules; the input end of the second-phase correction module is coupled to the output ends of the first group of signal processing modules; and the first group of signal processing modules receive the corrected signals of the first-phase correction module at the inputends and generate the processed signals of the first group of signal processing modules at the output ends. The phase detection module generates phase error signals according to the corrected signalsof an M-phase correction module. The filter module is used for generating at least one first-phase correction signal and a second-phase correction signal according to the phase error signals.

Description

Technical field [0001] The present invention relates to a phase correction circuit, in particular to a phase correction circuit and a correction method provided at the receiving end of a communication system. Background technique [0002] In a pass-band communication system, the transmitting end will use modulation (modulation) technology to carry the baseband signal on the carrier to generate a modulated signal. The modulated signal passes through the channel ( channel) and reach the receiving end. At the receiving end, the received signal is generally demodulated to remove the carrier or reduce the carrier frequency to facilitate subsequent signal processing. However, the carrier of the transmitting end and the receiving end are usually not completely synchronized, so There will be effects such as carrier frequency offset and carrier phase offset. Therefore, the receiving end will have a carrier recovery circuit to overcome the above effects. [0003] The general carrier recove...

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Problems solved by technology

However, if the phase correction module is arranged before the signal processing module, that is, it is used to correct the input signal, the feedback signal and the input signal will have a phase deviation for a phase that changes rapidly, that is, the input signal cannot be corrected accurately. carrier phase, but there is a problem in tracking (tracking); on the other hand, if the phase correction module is arranged after the signal processing module, although there is no problem in tracking, the processed signal will still have a carrier phase deviation , so it is necessary to consider the effect of carrier phase deviation in the design

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