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## White Gaussian Noise |

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102 Threads found on edaboard.com: **White Gaussian Noise**

Hi Guys:
Is flat band output **noise** is equal to **white** **gaussian** **noise**?. What are the factor contributing to this effects?. Is even order distortion a contribution factor?. Thanks in advance
Rgds

Analog Circuit Design :: 19.03.2005 20:58 :: hrkhari :: Replies: **1** :: Views: **1243**

Y = AWGN(X,SNR) adds **white** **gaussian** **noise** to X. The SNR is in dB.
The power of X is assumed to be 0 dBW. If X is complex, then
AWGN adds complex **noise**.
Y = AWGN(X,SNR,SIGPOWER) when SIGPOWER is numeric, it represents
the signal power in dBW. When SIGPOWER is 'measured', AWGN measures
the (...)

Digital communication :: 27.03.2006 23:28 :: carpa :: Replies: **3** :: Views: **4729**

Hi,
i've read that **white** **gaussian** **noise** has zero mean and a variance of 1. at the same time, the power spectral density has to be uniform all throughout in frequency.
i am confused as to how to program to generate this **noise** and i need some clarification to fully understand this.
thanks for the help in advance.

Electronic Elementary Questions :: 19.03.2008 22:46 :: thered :: Replies: **5** :: Views: **6670**

I have samples for **white** **gaussian** **noise**(WGN) w for n = 1:N. The power of this WGN is \frac{1}{N} \sum_{l = 1}^{N} w^2 . I can use this to calculate for given intervals with Matlab but I want to find an analytic expression for this? How do I proceed? Should I be using PSD of WGN ?
M

Digital Signal Processing :: 17.06.2009 11:09 :: magnetra :: Replies: **0** :: Views: **2529**

Dear Sir
i need to know how to add AWGN(Additive **white** **gaussian** **noise**) to a signal using C code...please provide me with some guidelines...

Digital communication :: 29.09.2010 00:17 :: sathishrdh :: Replies: **1** :: Views: **2741**

Hi everybody!
Can you help me to write in matlab code a zero-mean **white** **gaussian** **noise** with variance=10^-4
Thanks so much!!

Electronic Elementary Questions :: 05.10.2010 10:19 :: ardea :: Replies: **2** :: Views: **3314**

Hi everbody,
I am working on my course project in developing MSK transmitter and receiver. I have modulator and demodulator working perfectly. Problem comes when i tried to add **white** **gaussian** **noise** in the channel. The receiver output is still the same it has no effect of addition of **white** **noise**. As a (...)

Digital communication :: 04.12.2011 12:59 :: deep8006 :: Replies: **0** :: Views: **278**

Hi everybody guys, I'm writing a signal processing software using C, so I'm a little bit "stuck".
I generated a triangular sampled signal. I need to add **white** **gaussian** **noise** to it at a certain SNR.
I calculated the power of autocorrelation as:
\frac{1}{N}\sum_{i=0}^{N-1}x^{2}
and then divided each element of the array with

Digital Signal Processing :: 05.10.2012 06:10 :: DeliriumCordia :: Replies: **1** :: Views: **382**

Hi guys,
Merry Christmas! I am newbie here and I would like to use the Xilink **white** **gaussian** **noise** generator in Simulink under 2012a matlab to generate the **noise** for my calculation. In the System Generator for DSP reference guide "UG639 (v 13.4) January 18, 2012", it mentioned that the WGNG was built based on (...)

Digital Signal Processing :: 22.12.2012 09:15 :: Adam8198 :: Replies: **0** :: Views: **254**

Hi max19:77,
I am not familiar with Xilinx library but if you needs Additive Gaussion **white** **noise** most probably you will be able to do it using simple PRBS folowed by the low-pass digital filter and finaly decimator.
Regards
dora

PLD, SPLD, GAL, CPLD, FPGA Design :: 28.06.2004 13:12 :: dora :: Replies: **2** :: Views: **1170**

which are **white** **gaussian** channel characteristic
thank you for help

Digital communication :: 22.01.2007 04:50 :: tti :: Replies: **4** :: Views: **639**

Dear all,
what are the features of **white** **noise** in theory?
2nd-when using "randn" in MATLAB to create a **white** **gaussian** **noise**; what is meant by "**white**" ? I mean that this **noise** isn't infinite. I think it is called "**white**" because it contains most of the (...)

Digital Signal Processing :: 12.06.2008 02:05 :: scholar_a :: Replies: **4** :: Views: **1006**

here is some details on the **gaussian** **noise**
Additive **white** **gaussian** **noise** - Wikipedia, the free encyclopedia
also there is a function in matlab called awgn
you can use the help of matlab to get some details on it
or

Electronic Elementary Questions :: 14.06.2011 16:33 :: flashking :: Replies: **2** :: Views: **5094**

Hi,
I need to made a **white** **gaussian** **noise** generator (VHDL language) for the implementation on a FPGA Xilinx.
Is there anyone that could help me in the implementation with VHDL?
Thank you for your time!
Max

PLD, SPLD, GAL, CPLD, FPGA Design :: 25.06.2004 04:19 :: max19:77 :: Replies: **2** :: Views: **2026**

usually the term **noise** means **white**, **gaussian** distribution. But your question sound as different meaning. Do you ask for **white**, **gaussian** **noise** or for randomatic sparks discharge?

RF, Microwave, Antennas and Optics :: 20.01.2006 17:16 :: sergio mariotti :: Replies: **3** :: Views: **829**

How can I accurately add to my signal **white**
**gaussian** **noise** of exact SNR in dB (in POWER not
voltage terms)?
when I use awgn(...) function it seems
to me the **noise** has more power than I
set in its SNR parameter.

Digital Signal Processing :: 25.03.2006 00:21 :: lincolndsp :: Replies: **4** :: Views: **1890**

Hi,
I am analyzing the effect of **noise** on my system.
For this I want to put a **noise** source at the input of the system.
Can anybody tell if there is any voltage source in Cadence which generates **noise**.
I want **white** **gaussian** **noise**.
thanks
sarfraz

Analog Circuit Design :: 18.10.2006 23:28 :: shaikhsarfraz :: Replies: **1** :: Views: **1336**

I assume You used the term "**noise**" as "unwanted effect".
Phenomena like pulse distortion , pulse reflection etc. still exist at all frequencies, low and high.
But why usually it's taken in account at high frequencies? Because the lenght of the line is much longer ?λ .
For such long TX lines , the reflected signal combine it's phase wit

RF, Microwave, Antennas and Optics :: 18.11.2006 11:51 :: sergio mariotti :: Replies: **3** :: Views: **1247**

what if we use two **noise**s and normalize it to a power P/2 to get P power **noise** at the end ?
Added after 1 hours 19 minutes:
also in case of SIMO (two paths), is one **white** guassian **noise** enough or we need two **noise**s?
Also if we use two **noise**s do we have to normalize the power of (...)

Digital communication :: 29.03.2007 19:04 :: bee :: Replies: **5** :: Views: **1192**

Hello to all
I am to modellizate a RF LNA in matlab, but I have a problem with the **noise** figure model. To model it I defined the variance of the **white** **gaussian** **noise** as:
4*k*T*R*(NF-1)*fs
where NF is the lineare **noise** factor and the fs is the frequency simulation. I multiplied this value for the (...)

Digital Signal Processing :: 23.01.2009 07:09 :: dinone :: Replies: **0** :: Views: **1521**

your transmitted waveform is juat a sum of a sine and cosine, and so the signal power = 1 (A sine 's/cosine's power is 1/2, and they can added since they are orthogonal)
to be more exact
signal power = 1/T ∫ (from -T/2 to T/2) (sin (2*pi *t /T) + cos (2*pi *t /T) )^2 dt = 1
Since all possible symbols have same power (all constellatio

Digital communication :: 15.12.2009 11:14 :: bulx :: Replies: **3** :: Views: **2887**

Hey there,
I'm already aware of the in-built MATLAB functions for generating random numbers and **noise** (randn, rand, awgn etc.) It may be an easy solution but I guess I'm unable to see it clearly, so I thought I'd ask for some help here
My task is to create a software model of an LDPC Decoder, Encoder and the sort. While all that is completed th

Digital communication :: 04.02.2012 17:34 :: rayyanc :: Replies: **0** :: Views: **1641**

can anyone help me with the power supply **noise** effcet on phase **noise** of a ring oscillator in hspicerf?
I have read the mannual of hspicerf, it says i can model the **noise** source with an E element ot G element.
here comes the question, how can i model it? should i model it into a **white** **noise** or (...)

Analog Circuit Design :: 27.02.2012 01:28 :: sityeven :: Replies: **0** :: Views: **360**

There are projects that produce **white** **noise**, and from more than one type of device.
Some use an NPN with emitter-to-base operated in zener mode, or a zener diode, or a cheap noisy op amp. This method may or may not be available in simulator programs.
There are also commercial chips whose purpose is to generate **white** (...)

Digital communication :: 16.05.2012 03:54 :: BradtheRad :: Replies: **6** :: Views: **453**

n = 1/sqrt(2)*.
10.^(-SNR_dB(ii)/20)*n
what does the above two equations represeent? i have seen quite a lot to define **noise** but is it exactly they means?
thanks

Digital communication :: 19.01.2013 16:46 :: charly87 :: Replies: **15** :: Views: **1848**

Hi,
in QPSK system:
what are the matlab equations for **noise** and fading channel?
also;
what is the theoritical equation for calculating BER?
this is because I see several different formula, for example:
1-
N0 = 1/10^(SNR(i)/10);
n = sqrt(N0/2)*(randn(1,length(sig))+1i*randn(1,length(sig)));
h = sqrt(0.5*((randn(1,length(sig)))

Digital communication :: 22.04.2013 16:14 :: barznjy :: Replies: **2** :: Views: **418**

I am doing a simulation involving microwave antennas for image reconstruction. I would like to add **white** **gaussian** **noise** to my image in order to apply analog filter to filter out the **noise**.
However, I have to no idea on how to add the **noise** to my image.
Hope to get some ideas from fellow experts.
Thanks in (...)

Electromagnetic Design and Simulation :: 08.07.2013 01:58 :: nsw1216 :: Replies: **2** :: Views: **195**

Hello all,
I want to determine the power level (dB amp) of (supposed to be wgn) random signal using oscilloscope data. I have compiled a code to do the job but when tried to verify my code for several different signals (periodic sinus, random **gaussian**) generated on MATLAB, I have seen that the code yields different power levels for different sig

Digital Signal Processing :: 17.07.2013 05:32 :: von Moltke :: Replies: **0** :: Views: **222**

Yes, in frequency domain thermal **noise** is a **white** **noise**, and in power domain, it has **gaussian** distribution property.

Analog IC Design and Layout :: 15.06.2005 12:35 :: ablue :: Replies: **6** :: Views: **1540**

I'm simulating Direct Sequence BPSK system in Matlab.
The spreading sequency is 24 bit length, i.e 24 bits spreading for every data bit.
However, when I'm simulating it I get better results than theoretical.
I think I don't use correctly with "awgn" function in matlab
The syntax is:
Y = AWGN(X,SNR) adds **white** **gaussian** **noise** to X. (...)

Digital Signal Processing :: 10.07.2005 02:12 :: DimaA :: Replies: **0** :: Views: **697**

yup, I already made the nioseless constellation diagram.
% ASK constellation diagram without **noise**
N=1000; %number of bits that were transmitted
XMIN=-1.5;
XMAX=1.5;
YMIN=-1.5;
YMAX=1.5;
for i=1:N
S=round(rand); %a source that generates a random numbers (0,1)
if S==1
x1=1.;
y1=0

Digital Signal Processing :: 20.12.2005 10:18 :: Na3noOo3 :: Replies: **3** :: Views: **3555**

1)amplitude modulation is linear modulation and angle modulation falls under non linear modulation...
2)AWGN...additive **white** gausian **noise**...
**noise** will add with will have gaussion distribution....its value will a constant one for all frequencies..for that it is called with name tag "**white**"

Electronic Elementary Questions :: 10.02.2006 08:12 :: electronics_kumar :: Replies: **3** :: Views: **715**

AWGN and rayleigh?
AWGN effect is additive wheras rayleigh is multiplicative (that is why it fades some data).
AWGN means additive **white** **gaussian** **noise**. so the **noise** is assumed to be normally distributed with mean zero.
Now, imagin the random variable Z = X + j Y where X and Y are both normally distributted (...)

Digital Signal Processing :: 04.03.2006 16:28 :: tiger_shark :: Replies: **1** :: Views: **1180**

In a CDMA receiver, there are two **noise** sources of interference that are purely **white** **gaussian** **noise**:
-The receiver's input referred thermal **noise** power spectral density No.
-The transmitter's thermal **noise** power spectral density in the receive frequency band.
In your case definitely (...)

RF, Microwave, Antennas and Optics :: 18.03.2006 15:28 :: vfone :: Replies: **3** :: Views: **702**

encode the signal the modualtion at the rec

Digital communication :: 05.04.2006 10:46 :: Maya Laxman Sawant :: Replies: **0** :: Views: **1917**

Ioc cell interference power density
Ior total trnsmitted power densityby mobile.
Ioc / Ior means SIR of received signal
to get it from link level simulation for additive **white** **gaussian** **noise** (AWGN)

Digital communication :: 11.08.2006 11:04 :: islamatef :: Replies: **2** :: Views: **1086**

I need ,atlab file for
link level simulation for single additive **white** **gaussian** **noise** (AWGN)

Digital communication :: 12.08.2006 11:41 :: islamatef :: Replies: **0** :: Views: **371**

Hi there,
What distribution would you like your **noise** to have? are you using it as a channel **noise** emulator to simulate your communication list as additive **gaussian** **noise**? In that case, simple LFSR would not work for you.
In order to generate **gaussian** pn **noise** (...)

PLD, SPLD, GAL, CPLD, FPGA Design :: 12.11.2006 15:56 :: tiger_shark :: Replies: **6** :: Views: **5948**

Hi,
I need some advices and some help thanks to everyone
My final project is about the problem of instantaneous frequency for FM signals imbedded in **white** **gaussian** **noise**
I implemented some of this methods, and I want to do the comparison between this methods. Can you advice me how to do it?
I heard that it?s possible to do the (...)

Digital Signal Processing :: 13.07.2007 03:40 :: Nab :: Replies: **3** :: Views: **758**

The Shannon-Hartley capacity theorem computes the system capacity (C) of a channel with additive **white** **gaussian** **noise** (AWGN). You need to realize this theorem only sets a theoretical limit on transmission rate, not error probability. It is:
C = W * log2(1 + S/N)
S/N is the average signal-to-**noise** ratio and W (hertz) (...)

RF, Microwave, Antennas and Optics :: 09.08.2007 07:19 :: rrumpf :: Replies: **1** :: Views: **1151**

i have to make programs for qpsk,qam,16 qam,64 qam,and calcualte the ber vs eb/no and plot them.
i have made some programs which im also sending see if u make cahnge and corect them.

Digital communication :: 17.08.2007 20:28 :: cadenceUK :: Replies: **0** :: Views: **1527**

In the awgn channel the **noise** added is **gaussian** as well as **white** **noise**...
my question is whether **gaussian** distributed **noise**s are always **white** **noise**....?
is the vice versa is also correct...?

Digital communication :: 26.10.2007 06:56 :: lordsathish :: Replies: **6** :: Views: **3379**

do anyone has got the proof or have any idea of getting this proof that MMSE equation i.e. min E can be standerized to ( (H'H+σ?)^-1 )H'
where ' ----> hermettian transpose
^2 ---> rasie to the power 2
^-1 ----> raise to the power -1
σ ------> **noise** variance
E ----->

Digital communication :: 31.10.2007 16:32 :: bee :: Replies: **8** :: Views: **3256**

ur way may be correct but the thing is that i want to implement it in MATLAB and for that i dont think if i need quantization. the problem i m facing is that my soft viterbi decoder works fine in AWGN channle but when I apply my soft viterbi deocoder in Rayleigh fading channel with **white** **gaussian** **noise** the BER vs SNR graph is same as if (...)

Digital communication :: 16.01.2008 23:37 :: bee :: Replies: **23** :: Views: **11078**

Hi. I need to design Additive **white** **gaussian** **noise** in verilog..can anyone help me out?
Thanks in advance.
Sudhir Dakey

Digital communication :: 03.01.2008 02:51 :: sudhir_dakey :: Replies: **0** :: Views: **642**

help awgn
AWGN Add **white** **gaussian** **noise** to a signal.
Y = AWGN(X,SNR) adds **white** **gaussian** **noise** to X. The SNR is in dB.
The power of X is assumed to be 0 dBW. If X is complex, then
AWGN adds complex **noise**.
Y = AWGN(X,SNR,SIGPOWER) when SIGPOWER is (...)

Digital communication :: 04.03.2008 13:46 :: ahmedseu :: Replies: **6** :: Views: **19067**

i've read that **white** **gaussian** **noise** has zero mean and a variance of 1. at the same time, the power spectral density has to be uniform all throughout in frequency.
i am confused as to how to program in mathcad to generate this **noise** and i need some clarification to fully understand this.
thanks for the help in advance.

Digital communication :: 20.03.2008 00:20 :: thered :: Replies: **0** :: Views: **851**

maybe it's because the **noise** (thermal, **white**, **gaussian**) is directly proportional to the system's bandwidth

RF, Microwave, Antennas and Optics :: 01.05.2008 18:17 :: fernetbranca :: Replies: **6** :: Views: **632**

Hi
I'm simulating according to the existing paper. However, I dont understand some parameters and dont know how to generate them.
Could anyone please help me?
"The variance fo additive **white** **gaussian** **noise** at each receiver is assumed equal and unified. The fading channel is three-path Rayleigh fading channel with exponential power (...)

Digital communication :: 16.03.2009 04:26 :: honhungoc :: Replies: **0** :: Views: **769**

Hi all
In multiuser OFDM, suppose the average SNR per subcarrier is 15dB. The variance of additive **white** **gaussian** **noise** at each receiver is assumed equal and unified (means =1). The average channel gain is from 0.1 to 1.
From this, can I compute the total transmit power?
Please help me
Thank you

Digital communication :: 30.03.2009 05:04 :: honhungoc :: Replies: **0** :: Views: **761**

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