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Digitalization automatic frequency detection method based on true signal

A technology of automatic frequency and detection method, applied in the direction of automatic frequency control components, communication between multiple stations, etc., can solve the problem of high complexity

Inactive Publication Date: 2009-07-01
COMBA TELECOM SYST CHINA LTD
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0009] The purpose of the present invention is to provide a digital automatic frequency detection method based on real signals in order to overcome the high complexity of the complex signal-based digital automatic frequency detection method

Method used

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  • Digitalization automatic frequency detection method based on true signal
  • Digitalization automatic frequency detection method based on true signal
  • Digitalization automatic frequency detection method based on true signal

Examples

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Embodiment Construction

[0031] Below in conjunction with accompanying drawing, specific embodiment of the present invention and principle are described in detail:

[0032] Such as figure 1 As shown, the digital automatic frequency detection method based on the real signal of the present invention is implemented together with the digital automatic frequency correction method based on the real frequency reference signal which is protected by the applicant in another application and disclosed in this application, It includes an A / D converter (that is, an analog-to-digital converter) 102, an automatic frequency detection and correction algorithm module 104, a D / A converter (that is, a digital-to-analog converter) 106, a low-pass filter 108, and a voltage-controlled oscillator device 110 and frequency divider / multiplier 112.

[0033] exist 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...

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Abstract

The invention discloses a digital automatic frequency detection method based on real 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; calculating the detection threshold and the measurement of the frequency reference signal; and determining whether the frequency reference signal exits in the received signals according to the calculated detection threshold and the measurement, wherein the frequency reference signal is utilized to maintain the frequency synchronization between the transiting side and the receiving side during the frequency correction process. Compared with the prior frequency detection method based on complex signals, the digital automatic frequency detection method doesn't need to acquire the mutually-orthogonal complex received signals of the channel I and the channel Q; overcomes the problem of imbalance compensation of the channel I and the channel Q; and greatly reduces the complexity of system implementation on the premise of ensuring the frequency detection performance.

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 detection method based on real signals. 【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 adopted is to use high-precision crystal oscillators at both ends of the transceiver. However, high-precision crystal oscillators are usually 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 known as a frequency calibration signal or pilot signal) from the transmitter to the receiver, and the receiver automatically corrects the freque...

Claims

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Application Information

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IPC IPC(8): H04B7/26H03J7/02
Inventor 窦怀宇
Owner COMBA TELECOM SYST CHINA LTD
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