Demodulation method and device for intermediate frequency modulation signal

A technology for modulating signals and demodulating devices, applied in transmission systems, equalizers, electrical components, etc., can solve the problems of low precision, non-orthogonal, and non-phase of I and Q signals, so as to avoid inconsistency and stability problem effect

Active Publication Date: 2020-04-10
深圳市统先科技股份有限公司
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Problems solved by technology

[0004] The present invention provides a demodulation method and device for an intermediate frequency modulation signal, aiming to solve the unequal I and Q gains or non-orthogonal phases caused by the existing quadrature demodulation method, that is, the obtained I and Q signals The problem of low precision

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  • Demodulation method and device for intermediate frequency modulation signal
  • Demodulation method and device for intermediate frequency modulation signal
  • Demodulation method and device for intermediate frequency modulation signal

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[0024] In order to make the purpose, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described The embodiments are only some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts belong to the protection scope of the present invention.

[0025] see figure 1 , figure 1 A schematic structural diagram of a demodulation device for an intermediate frequency modulated signal is provided for the first embodiment of the present invention, the device may be included in a communication receiver, or may be equivalent to a communication receiver, figure 1 The shown demodulation device ...

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Abstract

The invention discloses an intermediate-frequency modulation signal demodulation method and device. The intermediate-frequency modulation signal demodulation method comprises the steps that two signals, namely a narrow-band modulation signal and a local oscillation signal, are directly mixed through a mixing and filtering module, intermediate-frequency band-pass filtering is conducted on the mixed signals to obtain baseband signals, and the baseband signals are digitized to obtain disperse baseband signals before separation. Therefore, the inconsistency and stability problems of an analog device or the impedance mismatch problem of circuit board lines can be avoided, separating correction, interpolating operation and delayed calculation are conducted on the disperse signals through a separating correction module and an operation module. Compared with the prior art, high-precision I and Q baseband signals at the same moment can be obtained, namely the I and Q signals approach to be consistent in gain, and approach to be orthogonal in phase.

Description

technical field [0001] The invention belongs to the field of signal modulation and demodulation, in particular to a method and device for demodulating an intermediate frequency modulation signal. Background technique [0002] In the prior art, the demodulation method for the IF modulation signal is the quadrature detection digital sampling method. The traditional quadrature demodulation method is: respectively divide the zero-IF modulation signal into two paths: the first path modulation signal and the second path Modulate the signal, and divide the local oscillator signal into two channels: the first local oscillator signal and the second local oscillator signal. The first local oscillator signal is multiplied by a sine wave with a phase difference of 90°, and the multiplied local oscillator signal and the second modulated signal are successively subjected to frequency mixing, low-pass filtering and analog-to-digital conversion to obtain a digital positive signal. The quad...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/01H04B1/26
CPCH04B1/26H04L27/01
Inventor 王鑫
Owner 深圳市统先科技股份有限公司
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