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Digital COSTAS loop

A digital and loop filter technology, applied in the field of phase-locked loops and digital COSTAS loops, can solve the problems that the stability of the carrier signal and the speed of the response cannot meet the needs better, the structure of the digital COSTAS loop is not simplified enough, etc. Simplified, low-latency effects

Active Publication Date: 2011-03-16
UNIV OF SCI & TECH BEIJING
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  • Abstract
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Problems solved by technology

[0005] The technical problem to be solved by the present invention is that the structure of the existing digital COSTAS ring is not simplified enough, and the stability of the carrier signal output and the speed of response cannot better meet the demand

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Embodiment Construction

[0018] The technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the present invention. Apparently, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0019] In order to solve the problem that the existing digital COSTAS loop structure is not simplified enough in the prior art, and the stability and response speed of the output carrier signal cannot better meet the requirements, the present invention provides a digital COSTAS loop.

[0020] First of all, it should be noted that in figure 1 In , the dotted lines are only used to schematically represent the circuit modules of the preferred embodiment of the present invention, and do not li...

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Abstract

The invention discloses a digital COSTAS loop. The digital COSTAS loop comprises a first phase discriminator, a second phase discriminator, a signal phase-shift module, a voltage controlled oscillator and a loop filter, wherein the output ends of the first phase discriminator and the second phase discriminator are coupled with the input end of the loop filter through a first multiplier, the output end of the loop filter is coupled with the input end of the voltage controlled oscillator, the output end of the voltage controlled oscillator is coupled with the input end of the first phase discriminator through a seocnd multiplier, the output end of the voltage controlled oscillator is also coupled with the input end of the signal phase-shift module, the output end of the signal phase-shift module is coupled with the input end of the second phase discriminator through a third multiplier; and the loop filter contains a PID controller. The digital COSTAS loop has simplified structure, and can demodulate the carrier signal stably and fast.

Description

technical field [0001] The invention relates to a phase-locked loop, in particular to a digital COSTAS loop, which belongs to the field of signal modulation and demodulation. Background technique [0002] When the receiver performs coherent demodulation, it is necessary to recover the local carrier with the same frequency and phase as the transmitted modulated carrier. For the carrier component contained in the ordinary AM broadcast signal and the vestigial sideband modulation signal transmitted by wireless TV, the work of recovering the carrier can be completed by using the phase-locked loop to directly lock the carrier component in the received signal, but in many applications, in order to improve the transmission The power efficiency is high, and the modulation method of suppressing the carrier is often used for communication transmission. At this time, it is necessary to perform nonlinear processing on the received modulated signal to obtain the higher harmonic componen...

Claims

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Application Information

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IPC IPC(8): H03L7/08H03L7/093H03L7/099
Inventor 王洪泊陆凯
Owner UNIV OF SCI & TECH BEIJING
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