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# White Gaussian Noise

60 Threads found on edaboard.com: White Gaussian Noise

## Injecting noise to see Bit error rate response of coaxial cable

Hi I'm experimenting with power line communication by connecting 2 modems (Texas Instuments PLC developer's kits) through 100m of RG58 coaxial cable as a model power line and injecting white gaussian noise with a signal generator. The modems exchange modulated packets of data shown in fig 1. I was hoping to see the response of the Bit (...)

## How to generate AWGN.??

AWGN - Add white Gausian noise. to generate white gaussian noise u need function that generates random numbers with gaussian distribution (example randn in matlab) If your enviroment doesnt have gaussian distributed random generator you have to make one using standard (...)

## Carrier-to-Noise (C/No) measurement on R&S FSP

Hello, I have tried to measure C/No on a Rohde & Schwartz FSP. I have a source that can generate different C/No (gaussian white noise). When I try to measure with the FSP I come no where neare the wanted value. Is there anyone who have tried to measure this with the Rohde & Schwartz FSP? Regards

## i need matlab for this system dynamics

a random Rayleigh flat-fading channel object based on Jake?s model is generated in MATLAB with sampling period of 10 μs and the maximum Doppler shift is set to 200 Hz. The additive white gaussian noise with SNR of 23 dB is used. The required BER is set to 10−3 and the average transmit power is fixed at 0.2 W. Two independent (...)

## gaussian noise generation

You can generate N samples of complex white gaussian noise with power sigma2 in Matlab or GNU Octave using the randn function: n = (randn(1,N) + 1j*randn(1,N))*sqrt(sigma2/2); To check the sample power of this noise is approximately equal to sigma2 (for sufficiently large N), you can then use: Pn = n*n'/N So, to get yo

## What is the reference value of standard deviation of white Gaussian noise when doing

Hi! what is the standard deviation of white gaussian noise when doing SINR simulation? I am new to communication simulation. I have a project which needs to calculate SINR. SINR = P/(N+I), and here the noise is white gaussian noise. Generally speaking, is there any (...)

## Power of Periodic and Non-Periodic(White Gaussian Noise) Signals using FFT

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

## AWGN generator blockin system generator

Hi all, I am looking for additive white gaussian noise generator . I found that the LogicCore is discontinued by xilinx. I would like to try using system generator , but my matlab version seems incompatible with system generator. Can anyone help me some ways , how can I add WGN to my signal and verify it whether its right or not ? Thanks

## Adding White Gaussian noise to a signal

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

## Basic digital communication

If you add all the different frequencies(colors) of light you get white light. THAT's where it comes from.

## New Sysgen White Gaussian noise generator

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 (...)

## Transformation sinus signal + Gaussian white noise

Hi. I first time write in this forum. I am lookin for a information about transformation sinus signal + gaussian white noise passing through diode(or some other nonlinear element). I am interested in output signal noise dispersion. Please, advise book or paper about this. Regards, Sergey

## adding white gaussian noise to correlation without awgn [C]

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

## How to generate a wide band signal with given auto correlation

Hello all, How to generate a wide band signal with given auto correlation in MATLAB/C/C++ from white gaussian noise? Regards, Mayavi

## Question about difference between White Noise and Gaussian White Noise

I don't think P_average = infinity for white noise It is - by definition. Finite power density multiply infinite bandwidth equals infinite power. But it's a purely theoretical construct.

Hi all, I have got a Rayleigh Fading Channel Simulation code by Matlab but its performance about resulting BER is not right. The code list below: N=length(spread_sig); n = sigmaN*(randn(1,N)+1j*randn(1,N))/sqrt(2); % white gaussian noise, 0dB variance h = 1/sqrt(2)*(randn(1,N) + 1j*randn(1,N)); % Rayleigh channel,the range of h (...)

## power supply noise effect on the phase noise in hspicerf

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 (...)

## White Gaussian Noise Generator on MATLAB

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

## Mathematical relation between BER and SINR

Hi everybody, I have a grid network of 8 nodes and sink at center. With node assuming transmitter, i got average SINR (for that transmitter, there are possible combinations of other nodes interfering) with a specific Medium access protocol and BPSK modulation and white gaussian noise. Now i want to get BER from average SINR. (...)

## Problem With addition of white gaussian noise at the modulation output using MSK

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 (...)

## Gaussian noise in matlab

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

## Characteristics of a channel.

What do you mean by "Channel is linear"? I mean when do you say a channel is linear? I read "The signal transmitter through the channel is disturbed by white gaussian noise process. The reasons for this assumption is that it makes the calculations tractable". What do mean by "it makes the calculation tractable"? How do you say

## matlab code for white gaussian noise

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

## How to add AWGN(Additive White Gaussian Noise) to a signal using C code

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...

## Calculating linear array gain (and beamformer gain)

Hi I am working on conventional frequency domain beamforming for linear microphone receive array. I have simulated 32 channels array data using white gaussian noise with proper delays corresponding to target at 45 degree emitting 20KHz tonal. I beamformed this data to make 32 beams time series data. To calculate array gain (or (...)

## Modelling of Wireless channel

There are two effects that you should consider in your channel: noise and passband limitation (banwidth). If you are working on Simulink, you can add a "white gaussian noise" generator to your circuit, and a bandpass filter for passband limitation (The passing bandwith of the filter is the working frequency rane of your (...)

## white and 1/f noise, randn MATLAB

In MATLAB a = randn(1,1000) results in a vector of 1000 elements with a gaussian distribution, mean=0 and variance=1. b = cumsum(a) what is "b"? It seems to be meaningless. c = sqrt(cumsum(a.^2)) If "a" is white noise, then is "c" 1/f noise? How is the mean and variance of "c" related to that of "a"? Thanks.

## SNR of WGN perturbed signal

I am trying to analyze the variability of detection time by a threshold detector for input signal perturbed by a white gaussian noise(w) N(0,sig^2). My input to the detector is a ramp-signal x with added WGN w. The input signal is supposed to have a fixed SNR. Now, I decide to use the input of duration/length L. Then compute the inp

## White gaussian noise power

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

## MATLAB - need help with Speech Enhancement project

white gaussian noise mean that it got all the frequencies of the same amplitude

## Question related to SNR - the total transmit power

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

## Need help in Rayleigh fading channel

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 (...)

## Matlab LNA modelling problem with the noise figure model

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 (...)

## RF noise calculation software

which type of noice calculator this? whether it will gaussian or white noise. is there any othere noise calculator avilable? if you know anything anout that please mail me. --------- vijai sreevysh

## Low-pass Gaussian white Noise

Hi, I want to generate a slowly changing signal (1 second duruation). For this, I must filter white noise with a filter which is characterized by an alpha function as below alpha(t)= t*exp(-t/tau) ( I think function is low-pass filter response) where tau=3 ms. I couldnt achive this in matlab. Can anyone help me for this? Regard

## A simple but important question on white/colored noise

>what are the features of white noise in theory? It has the same power at all frequencies. In other words, its auto corrleation is an impulse. >2nd-when using "randn" in MATLAB to create a white gaussian noise; what is meant by "white" ? I mean that this noise isn't (...)

## How to write a Matlab program to generate White Gaussian Noise (WGN)?

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.

## How to write a Matlab program to generate WGN?

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.

## How to measure the DC noise?

to know the amount of the noise and it's spectral density You may use the FFT Analyzer ( also called Dynamic Signal Analyzer or Low Frequency Spectrum Analyzer). To know how much the noise is "white" and gaussian You have to sample, store and then perform the Allan Variance

## Matlab functions for AWGN and fading channel models

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 (...)

## How to model AWGN in verilog

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

## Wiener filter question

Hi, everyone. When I did a question on Wiener filter, I do not know how to deal with it. The question is as follows. _____________________________ It is known that a certain object g(x,y) of size 256X256 is filtered by h(x,y) and then is corrupted by white additive gaussian noise n(x,y) to become i(x,y). We observe i(x,y), and our (...)

## Are gaussian distributed noise always white noises in awgn channel?

The answer is "NO". Distribution does not concern anything about time or frequency. Gaussion noise can have any power spectrum shape, and the very special one of it is white.

## Explanation of the Shannon's law equation

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) (...)

## gaussian white noise process and autocorrelation

how to find autocorrelation Rv(τ) v(t)=w(t)*cos(2Πft+Φ) Φ and w(t) independent w(t) gaussian white noise process Thanks

## Gaussian Channel addition and noise normalization ????

You need two independent white gaussian noise otherwise, the the noise received by the two receiver are coherent and no diversity gain.

## White gaussian channel characteristics

which are white gaussian channel characteristic thank you for help