Newest 'pll' Questions

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Worst-case error bounds for PLL

I am working on a project that involves time synchronization and we want to derive worst case bounds for the accuracy of the current time given measurements with known error as input. Unfortunately ...

reference-request pll

asked Jun 22 at 19:44

Watson Ladd

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Doppler shift in police radar

I don't understand how the radar frequency can be extracted from this diagram : (source:https://copradar.com/rdrparts/) and specially i don't understand what is the role of PLL and IF circuits and ...

radar pll electrical-signal

asked Jun 17 at 13:12

Zakaria Fikri

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votes

1answer

83 views

SRF-PLL discretization problem

So I've been working on how to digitally implement a static reference frame PLL (SRF-PLL), which is a quite popular PLL used for extracting three-phase grid angle. This PLL works by using the DQ0 ...

estimation control-systems non-linear pll unit-delay

asked May 24 at 3:03

Chi

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The mean value of phase noise as a stochastic process

What is the mean value of phase noise as a stochastic process? Where can I get a theoretical analysis of this topic? PS: PLL produces cos(2*πfct+φ(t)). The phase noise refers to φ(t). The mean value ...

phase stochastic theory pll

asked May 17 at 2:59

wu yi

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PLL carrier recovery: intermediate versus baseband

When looking at carrier recovery, a PLL is often applied to correct the frequency offset between the local oscillator and the transmitter after down conversion. I'm wondering what happens to the PLL ...

discrete-signals digital-communications pll

asked Apr 18 at 18:31

FourierFlux

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Resources on software PLLs in high latency systems?

For my master thesis I am prototyping a software PLL in Matlab using an Analog Devices AD9467 (ADC) evaluation+capture board. The VCO I am trying to control has an output frequency of approx. 2.2GHz ...

adc pll

asked Feb 28 at 9:18

Juanig

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How does a Costas Loop lock to one of multiple BPSK signals

I've been looking into how GPS receivers work in terms of signal processing. When a GPS receiver tracks the received signal, it often uses a Costas loop to synchronize the carrier. How that works ...

phase demodulation bpsk tracking pll

asked Feb 4 at 1:58

Tobias

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243 views

Residual carrier tracking with PLL

Residual carrier systems such as PCM/PM/NRZ and PCM/PM/Bi-phase are common in space applications. Compared to suppressed-carrier systems such as BPSK, the literature sources on residual-carrier ...

gnuradio pll

asked Jan 26 at 16:18

Moses Browne Mwakyanjala

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203 views

GNU Radio loop bandwidth normalization

From GNU Radio documentation, the control_loop block proposes loop bandwidth values in the range $[\frac{2\pi}{200}, \frac{2\pi}{100}]$ in radians per sample. Some blocks, like the new timing symbol ...

gnuradio synchronization pll

asked Nov 30 '18 at 17:09

Moses Browne Mwakyanjala

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46 views

upconverting a kHz/MHz signal to GHz

I want to know how in practice we can take a kHz/MHz signal to a GHz band? Suppose we have an FSK modulated signal at around 300 kHz (or 20 MHz). I want to take it to 3.5 GHz, so about 3499700 kHz ...

modulation pll

asked Oct 22 '18 at 8:28

Cror2014

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126 views

Basic PLL theory: voltage-controlled oscillator confusion

I am trying to write my first PLL in Python, and I've been making use of this excellent tutorial: http://www.pythonpowerelectronics.com/contents/tutorials/tutorial1/pll_tutorial.pdf Reading through ...

pll

asked Sep 25 '18 at 14:56

kb4444

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136 views

Dynamic loop bandwidth for a Costas loop

I'm using a Costas loop for carrier recovery. The BER vs SNR (from GNU Radio Simulation) curve for different loop bandwidths (0.03,0.05 and 0.07) is shown in the graph below. It can be seen that the ...

digital-communications gnuradio pll

asked Sep 5 '18 at 8:51

Moses Browne Mwakyanjala

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201 views

Software PLL tracking of carrier frequency in bandlimited transmission

My understanding is that a PLL(either in hardware or software) can recover the carrier frequency(or be used to correct the frequency offset) of a system. My question is how does this work when the ...

discrete-signals digital-communications pll

asked Aug 12 '18 at 20:04

FourierFlux

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394 views

Timing recovery in GNU Radio : Variable rate vs Fixed rate operation

I have been wondering about the implementation of timing recovery blocks in gnuradio. In literature, for asynchronous sampling, all that is needed are error detector (MM, ML, Gardner etc), a loop ...

synchronization gnuradio pll

asked Jul 26 '18 at 9:10

Moses Browne Mwakyanjala

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Carrier recovery with the Costas loop : PLL pull-in range

I have created a channel model in GNU Radio (a modified version of the default GNU Radio Channel Block). Its performance under AWGN (without timing, phase or frequency offsets) aligns properly with ...

gnuradio pll

asked Jul 14 '18 at 1:19

Moses Browne Mwakyanjala

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591 views

PLL phase and frequency characteristics

I'm currently working with BPSK carrier phase and frequency recovery in GNU Radio. I have been able to use Costas loop and Frequency locked loop (four carrier acquisition) which are based on the ...

gnuradio pll

asked Jul 13 '18 at 17:11

Moses Browne Mwakyanjala

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154 views

Phase ambiguity in QAM modulation

I'm currently studying a decision directed carrier recovery scheme. Basically a PLL try to estimate the phase error in the current received symbol, the phase detector compensate the incoming symbol's ...

digital-communications phase pll

asked Jun 17 '18 at 9:09

marcomanzoni

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177 views

Is Phase Locked Loop is essential for BPSK signal reception?

I'm noob in DSP studying BPSK communication between speaker and microphone using acoustic signal. I read article of this BPSK communication which says it needs Phase Locked Loop(PLL) sequence to match ...

bpsk acoustics multipath pll

asked Jan 15 '18 at 14:44

JayHeo

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212 views

Transfer function of a PLL Loop Filter that can support a linearly increasing (chirping) frequency

What is a transfer function for a the loop filter of a PLL that can track a sinusoid of the form: \begin{equation} x(t)=\cos\left(2\pi\left(\frac{1}{2}c_0t^2 + f_0t + \phi_0\right)\right) \end{...

digital-communications tracking pll

asked Mar 30 '17 at 0:46

MrMas

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Unable to stabilize 8-PSK signal with self designed costas loop

I am trying to make a signal processing block which implements the costas loop to stabilize an 8-PSK signal. Here is the flowgraph with "costas_loop" being my block. My workflow is the following - <...

qpsk gnuradio pll

asked Nov 2 '16 at 15:52

martianwars

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How to correct the phase offset for QPSK I-Q data

I have an I-Q data of QPSK modulation, the data is is smeared and I have to correct the phase offset that causes the smearing problem, how can I apply the Phased-locked loop or the Costas loop on this ...

demodulation qpsk pll

asked Jun 13 '16 at 17:51

Amro

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votes

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311 views

Symbol timing recovery design

I am trying to design the Symbol timing recovery(#STR) block of #DVBS Receiver. These are the specifications Symbol rate ($f_s$) = $2\textrm{ MHz}$ Acquisition range = $10\%$ of Symbol rate ...

digital-communications synchronization pll symbol-timing pid

asked Jun 1 '16 at 9:52

avi1987

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962 views

How to remove 50 Hz frequency noise from a PCM file?

Are you kind to tell me the odds or the means by which should I grab a clean signal with the $~50 \mathrm{Hz}$ hum removed using just programming? I managed to make a program in Visual-C that ...

audio frequency phase pll

asked Apr 6 '16 at 2:32

paul80

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237 views

Amplitude/phase recovery on noisy signal

I have a noisy signal that has an ac component of fixed frequency but variable amplitude and phase. I'd like to recover the ac component. The signal (blue trace) is mostly smooth, but has a few ...

filters phase demodulation compressive-sensing pll

asked Mar 28 '16 at 21:59

dansignal

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96 views

phase locked loop

I have seen that to get the phase angle of a signal, we have to use PLLs. this PLL is modeling in order to get the phase angle about one frequency, which is the free running frequency of the VCO. If ...

frequency control-systems pll

asked Aug 21 '15 at 19:49

Ahmed Abrous

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votes

2answers

242 views

FM demodulation amplifier with saturation

I'm trying to understand how FM demodulation works. I read a lot on the internet and as far as I understand, the main process is to extract the phase difference (that is also the output) between a ...

frequency demodulation pll

asked Jan 18 '15 at 21:27

marco6

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vote

3answers

976 views

PLL and zero crossing detection

Is there an algorithm which can give the frequency and phase of a three phase signal (three phase voltages) without using zero crossing detection. I mean an algorithm which is done in open loop.

frequency pll

asked Jan 10 '15 at 2:53

Ahmed Abrous

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184 views

Software implemented PLLs for signal synchronization, why use them?

In short I'm recreating a program that reads 3 sinusoidal signals through an ADC performs some manipulations and then reproduces these signals through a DAC. In order to reproduce these signals I need ...

pll

asked Sep 9 '14 at 4:09

Darren Lanigan

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votes

1answer

229 views

Why do most digital pll's only use the positive zero crossing?

I've been trying to get my head around digital plls from knowing nothing and seen that most examples only use the positive zero crossing, not the negative. I've tried to find the answer but the best i ...

pll

asked Sep 7 '14 at 13:31

Darren Lanigan

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votes

2answers

1k views

High modulation index PSK - carrier recovery

How to recover the carrier of a PSK signal that has high modulation index (eg. 750 symbols per second at carrier frequency 1500 Hz)? I guess that a PLL will not be able to lock onto it with such ...

bpsk pll

asked Jul 11 '14 at 10:11

Michał B.

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2

votes

0answers

460 views

Doppler shift using PLL

I am trying to apply phase lock loop to calculate phase shift due to doppler effect and finally calculate the doppler frequency($\Delta f$). I am assuming that the received wave is of the form, $r(t) =...

frequency-spectrum filter-design frequency phase pll

asked May 5 '14 at 13:59

BaluRaman

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vote

2answers

260 views

Melodic or tonal pitch contour tracking?

What algorithms or methods can be used for the tracking of audio pitch contours? (Such as in musical vibrato and glissando, or for tonal vowels in languages such as Chinese?). Will a PLL work even ...

frequency pitch pll

asked Mar 29 '13 at 23:13

hotpaw2

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5

votes

1answer

720 views

Phase Locked Loop Basics

I am trying to better understand discrete-time PLLs. I drew a picture of a simple feedback system here: I want to be able to describe and understand the system at v(t) and y(t). I found a fairly good ...

discrete-signals phase feedback pll

asked Mar 18 '13 at 2:02

Kyle - Microsoft

1897 bronze badges

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Questions tagged [pll]

Worst-case error bounds for PLL

Doppler shift in police radar

SRF-PLL discretization problem

The mean value of phase noise as a stochastic process

PLL carrier recovery: intermediate versus baseband

Resources on software PLLs in high latency systems?

How does a Costas Loop lock to one of multiple BPSK signals

Residual carrier tracking with PLL

GNU Radio loop bandwidth normalization

upconverting a kHz/MHz signal to GHz

Basic PLL theory: voltage-controlled oscillator confusion

Dynamic loop bandwidth for a Costas loop

Software PLL tracking of carrier frequency in bandlimited transmission

Timing recovery in GNU Radio : Variable rate vs Fixed rate operation

Carrier recovery with the Costas loop : PLL pull-in range

PLL phase and frequency characteristics

Phase ambiguity in QAM modulation

Is Phase Locked Loop is essential for BPSK signal reception?

Transfer function of a PLL Loop Filter that can support a linearly increasing (chirping) frequency

Unable to stabilize 8-PSK signal with self designed costas loop

How to correct the phase offset for QPSK I-Q data

Symbol timing recovery design

How to remove 50 Hz frequency noise from a PCM file?

Amplitude/phase recovery on noisy signal

phase locked loop

FM demodulation amplifier with saturation

PLL and zero crossing detection

Software implemented PLLs for signal synchronization, why use them?

Why do most digital pll's only use the positive zero crossing?

High modulation index PSK - carrier recovery

Doppler shift using PLL

Melodic or tonal pitch contour tracking?

Phase Locked Loop Basics

Hot Network Questions

Questions tagged [pll]

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