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
CN101986569AActive Publication Date: 2011-03-16UNIV OF SCI & TECH BEIJING
2 Cites 2 Cited by

Patent Information

Authority / Receiving Office
CN ยท China
Current Assignee / Owner
UNIV OF SCI & TECH BEIJING
Publication Date
2011-03-16

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

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.
Need to check novelty before this filing date? Find Prior Art

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More