Digitalized automatic frequency correction method based on true frequency reference signal
A technology of automatic frequency correction and reference signal, applied in the direction of digital transmission system, electrical components, transmission system, etc., can solve the problem of high complexity
Inactive Publication Date: 2012-10-24
COMBA TELECOM SYST CHINA LTD
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[0010] The object of the present invention is to provide a digital automatic frequency correction method based on a real frequency reference signal in order to overcome the above-mentioned shortcomings of high complexity of the digital automatic frequency correction method based on the complex frequency reference signal
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[0034] The specific embodiments and principles of the present invention will be described in detail below in conjunction with the accompanying drawings:
[0035] Such as figure 1 As shown, the digital automatic frequency correction method based on the real frequency reference signal of the present invention is implemented together with the digital automatic frequency detection method based on the real signal, which is protected by the applicant in another application and disclosed in this application, Including A / D converter (also known as analog-to-digital converter) 102, automatic frequency and correction algorithm module 104, D / A converter (also known as digital-to-analog converter) 106, low-pass filter 108, voltage-controlled oscillator 110 和frequency divider / frequency multiplier 112.
[0036] in figure 1 In, the received analog real signal r(t) comes from the intermediate frequency or baseband output of the transmitter. r(t) undergoes sampling and analog-to-digital conversion ...
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The invention discloses a digital automatic frequency correction method based on real frequency reference signals, which relates to the technical field of frequency synchronization of a transiting side and a receiving side in communication. The method comprises the following steps: sampling a channel of real received signals; under the condition that the real frequency reference signal exists in the received signals, calculating the frequency error function of the local frequency source signal and the received frequency reference signal; correcting the frequency of the local frequency source according to the frequency error function, thereby achieving the frequency synchronization between the transiting side and the receiving side. Compared with the prior frequency correction method basedon complex frequency reference signals, the digital automatic frequency correction method doesn't need to acquire the mutually-orthogonal complex frequency reference signals of the channel I and the channel Q; overcomes the problem of imbalance compensation of the channel I and the channel Q; and therefore, greatly reduces the complexity of system implementation on the premise of ensuring the frequency correction accuracy.
Description
【Technical Field】 [0001] The invention relates to a frequency synchronization system in the field of communication transmission, in particular to a digital automatic frequency correction method based on a real frequency reference signal. 【Background technique】 [0002] In a communication transmission system, the frequency of the frequency source signal at the receiving end usually needs to be consistent with the frequency of the frequency source signal at the transmitting end. In order to do this, one method that can be used is to use a high-precision crystal oscillator at both ends of the transceiver. However, high-precision crystal oscillators are usually more expensive, and frequency drift will occur after long-term use, requiring regular manual frequency correction. [0003] Another method that can be used is to send a frequency reference signal (also called frequency calibration signal or pilot signal) from the transmitter to the receiver, and the receiver automatically corre...
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IPC IPC(8): H04L7/00
Inventor 窦怀宇
Owner COMBA TELECOM SYST CHINA LTD