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## Carrier Frequency Offset |

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carrier offset , carrier frequency shift , carrier frequency amplifier , frequency offset

30 Threads found on edaboard.com: **Carrier Frequency Offset**

Phase noise is usually characterized in the **frequency** domain. For an ideal oscillator operating at ωo, the spectrum assumes the shape of an impulse, whereas for an actual oscillator, the spectrum exhibits ?skirts? around the center or ?**carrier**? **frequency** (Fig). To quantify phase noise, we consider a unit bandwidth at an (...)

Analog Circuit Design :: 08-17-2014 23:28 :: surma :: Replies: **0** :: Views: **272**

there are so many ways to calculate phase noise just by giving the waveform its difficult to tell, if you have power analysis it can be calculated by
Phase_Noise = 10*LOG (Pn / Ps)
Pn = Noise Power in 1Hz Bandwidth at particular **frequency** **offset** (fn) in Watts
Ps = **carrier** signal power in Watts
or for SSB
108293

Analog Circuit Design :: 08-14-2014 03:15 :: VPrasanth :: Replies: **2** :: Views: **313**

please explian me synchronisation and **frequency** **offset** problem in OFDM

Digital communication :: 07-01-2014 08:37 :: Priya274 :: Replies: **0** :: Views: **314**

You need additionally the power of the **carrier** signal, and the **frequency** **offset** from this **carrier**, s. e.g. this Wiki explanation.

Analog Circuit Design :: 05-10-2014 08:18 :: erikl :: Replies: **2** :: Views: **374**

One reference says that: "we know that the CFO (**carrier** **frequency** **offset**) causes the phase distortion in the OFDM symbol which can be denoted as 2πβn/N where B describes the CFO effect..""
so, any one can explain how this phase distortion (2πβn/N) is obtained?? Plz explain...

Digital communication :: 12-21-2013 07:47 :: munirp :: Replies: **0** :: Views: **330**

From the posted plot you already have the Phase Noise information.
The plot shows the SSB Phase Noise amplitude (in dBc/Hz) at **frequency** **offset** from the 1GHz **carrier** signal.
-125.8dBc/Hz @ 1kHz **offset**
-135.1dBc/Hz @ 10kHz **offset**
-140dBc/Hz @ 100kHz **offset**
-140.9dBc/Hz @ 1MHz (...)

RF, Microwave, Antennas and Optics :: 12-09-2013 03:11 :: vfone :: Replies: **2** :: Views: **297**

This picture is from book MIMO-OFDM Wireless Communications with Matlab by Cho Y.S. The MATLAB code is located in book directly below the figure.
function y_CFO=add_CFO(y,CFO,Nfft)
% add CFO (**carrier** **frequency** **offset**)
% y : Received signal
% CFO = IFO (integral CFO) + FFO (fractional CFO)
% Nfft = FFT size
nn=0:length(y)-1; y_CFO = (...)

Digital communication :: 11-11-2013 13:06 :: zemtcov :: Replies: **5** :: Views: **584**

Hello all,
I've a GFSK modem. Packets begin with a preamble of alternating zeros and ones.
The first stage is **frequency** **offset** estimation(FOE) that counts the no of zero crossings(ZC's) within a certain window (16 bits for example)then estimates the **carrier** freq **offset**.
I've added a code, within the FOE algorithm, to (...)

Digital communication :: 12-17-2012 09:33 :: darshkamal :: Replies: **0** :: Views: **307**

The following code is used to estimate and correct the **frequency** **offset** errors for a single **carrier** system
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
freq**offset** = 0; phase**offset** = 0;
hPFO = comm.Phase**frequency****offset**('**frequency****offset**', (...)

Digital communication :: 10-11-2012 06:21 :: ReComm :: Replies: **1** :: Views: **655**

To know the lower integration **frequency**, you would want to know something about the way the communications system works.
Lets say it is a 64 QAM system that has a **carrier** tracking loop in the receiver. Such a system has a **carrier** tracking loop. Lets say you are sending 10 Mbps of data, and the **carrier** tracking control (...)

Analog Circuit Design :: 11-26-2011 15:07 :: biff44 :: Replies: **1** :: Views: **741**

Hi all,
I'm implementing STBC-MIMO and MIMO-OFDM system using SDRs.
Before doing actual coding, I'm working on MATLAB simulation of CFO estimation and recovery and channel estimation.
I'm reading some Dr. Giannakis' papers about joint CFO and channel estimation.
Besides Dr. G, I know that many people have researched joint CFO and channel es

Digital communication :: 02-18-2011 05:57 :: ychang44 :: Replies: **0** :: Views: **907**

Send known data, find the amount of rotation, from this find the **frequency** **offset**. Then, for subsequent unknown data, multiply this **frequency** with the with incoming **carrier** and filter our unwanted **frequency**. Thus you rotate is back to correct value
- b

Digital communication :: 04-10-2010 03:26 :: bulx :: Replies: **3** :: Views: **1816**

Hi,
I am trying an algorithm for CFO cancellation.
I would like to know how well the algorithm performs with respect to the CFO required for commercial systems.
Unfortunately, after googling a lot (web+scholar) I could not find any proper table/list/article that defines what is the allowed CFO in relevant applications.
I believe there sho

RF, Microwave, Antennas and Optics :: 12-30-2009 13:34 :: moshiko :: Replies: **1** :: Views: **873**

Use the following formula to calculate the Phase Noise using the Spectrum Analyzer:
PN_on_SA = **carrier**_Power ? Noise_Power ? 10*LOG(RBW)
where:
- **carrier** Power is the power of your signal measured on the SA display.
- Noise Power is the power of the noise at a specific **frequency** **offset**.
- RBW is the Resolution Bandwid

RF, Microwave, Antennas and Optics :: 11-21-2008 17:14 :: vfone :: Replies: **7** :: Views: **1936**

See figures 4-47 and 4-48 below from Ulrich Rohdes book "Digital PLL **frequency** Synthesizers, Theory and Design".
He claims 168 dBc/Hz at "a few kHz" **carrier** **offset** of a 5 MHz crystal oscillator design.

RF, Microwave, Antennas and Optics :: 06-30-2008 17:55 :: VSWR :: Replies: **7** :: Views: **858**

In a comm system, CFO refers to the difference in **carrier** **frequency** at transmitter and reciever. The Tx would transmit at the nominal **carrier** **frequency**. At the Rx the unmodulated **frequency** is required for reception; and is usually generated in the Rx with crystals or so. However, it is not physical possible (...)

Digital communication :: 06-30-2008 11:20 :: bulx :: Replies: **3** :: Views: **11450**

Did you mean where **frequency** **offset** is more than 1/2 of the **carrier** spacing in the preamble?

Digital communication :: 06-19-2008 10:35 :: rfsystem :: Replies: **3** :: Views: **911**

I can't understand your code, and maybe I am wrong but it is probably the code is completely wrong.
At least there should be a modulation signal such as random bit sequence. And then the bit sequence is modulated with QPSK format on a **carrier**. Then the **frequency** **offset** should be added to the **carrier**. You can assume the (...)

Digital communication :: 01-29-2008 02:33 :: wwfhm2002 :: Replies: **2** :: Views: **7707**

The origin of the DC sub**carrier** exception is historical.
The analog implementation of TX path in the OFDM had in the past no special methods to suppress the **carrier** leakage or back referred DC **offset**s. Together with the situation in the past that there was no baseband controlled **frequency** **offset** (...)

Digital communication :: 01-04-2008 05:07 :: rfsystem :: Replies: **11** :: Views: **3535**

Phase noise is measured as dBc/Hz. dBc stands for dB per **carrier** i.e measured noise power with respect to the **carrier** power. Phase noise takes a skirt like shape with noise being higher closer to the **carrier**. The **offset** **frequency** is the difference in **frequency** between the (...)

Analog Circuit Design :: 12-10-2007 01:22 :: ieropsaltic :: Replies: **2** :: Views: **686**

LO output power, is usually is in the range -10dBm to +10dBm.
If you referred to the phase noise power you have to specify the **offset** from the **carrier** where you are looking for this power.

RF, Microwave, Antennas and Optics :: 06-20-2007 03:52 :: vfone :: Replies: **5** :: Views: **716**

In the base band you need to add a dc which will turnout as **carrier** leakage. Is this what you are looking for.
Madhukar

RF, Microwave, Antennas and Optics :: 04-06-2007 05:52 :: brmadhukar :: Replies: **1** :: Views: **732**

Say there are spurs 1 MHz from the **carrier**, on either side, that are -30 dBc. Think of them as phase modulation sidebands, with a modulation **frequency** of 1 MHz. If you divide by 2 the **carrier** **frequency** halves, the modulation **frequency** of 1 MHz does not change, but the phase deviation does (gets smaller), (...)

RF, Microwave, Antennas and Optics :: 12-09-2006 09:43 :: biff44 :: Replies: **3** :: Views: **1307**

analog AFC circuits are designed for a single **carrier** modulation. It changes the tuning of the receiver so that the mean/median peak of the power spectrum is in the center of the IF stages.
There may be more sophisticated DSP methods of doing this.

Digital communication :: 03-20-2006 23:27 :: flatulent :: Replies: **7** :: Views: **4049**

sorry fot that is at 600kHz **offset** from the **carrier**

Analog Circuit Design :: 03-19-2006 08:10 :: shekar380 :: Replies: **3** :: Views: **755**

what is meant by the following terms :
1- channel eqaulization
2- **carrier** **offset** **frequency**
thanks
chanel equalization means compensating the system response with the intent to get a satisfatory response for interested bands, for example, get linear phase response for different **frequency**
**carrier** (...)

Elementary Electronic Questions :: 03-05-2006 21:42 :: ferrite :: Replies: **1** :: Views: **697**

I find that in some algorithm the received signal(atfer matched filter) is expressed as:
r(t)=∑Sk*exp{j*(Δωt+Θ)}*g(t-kT-τ)+n(t)
2 questions:
1, why is Sk a complex array? If so, it will impact the angle of correlation of r(n)(sampled) and the final **offset** not only contain the **carrier** **frequency** (...)

Digital communication :: 03-03-2006 02:57 :: enjoypercy :: Replies: **0** :: Views: **767**

Hi Professional,
I remember that Phase noise which often refer to CW **carrier** for GSM TXVCO
can be used to calculate GSM modulated power for certain **offset** to (desired channel) **frequency**. It means that if I want to get TXVCO PN requirement by the clue of modulation spectrum of GSM @ 400KHz **offset**, which is -60dBc, then, (...)

RF, Microwave, Antennas and Optics :: 01-06-2006 02:29 :: Wilson_yu_chen :: Replies: **2** :: Views: **855**

in OFDM sytems **carrier** **frequency** **offset** can occur due to doppler shift and local oscillator mismatch. you have understood the first part.
When the baseband signal is converted to RF signal at the Tx, there will be a oscillator used to generate the RF **carrier** wave. Now, at the Rx end, there will be a similar oscillator (...)

Digital Signal Processing :: 11-03-2005 02:52 :: Gandharva :: Replies: **4** :: Views: **1681**

it means that @10 KHz **offset** we measure the phase noise at **carrier** **frequency** plus (+) or minuse (-) 10khz? is it truse?

RF, Microwave, Antennas and Optics :: 07-05-2004 06:38 :: m229 :: Replies: **9** :: Views: **3045**

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