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56 Threads found on edaboard.com: White Gaussian Noise
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
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 (...)
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
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
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
From where this "white" word come in Additive white gaussian noise .? ( I know that PSD of noise is flat but why white ??) Plz help
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 (...)
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
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
Hello all, How to generate a wide band signal with given auto correlation in MATLAB/C/C++ from white gaussian noise? Regards, Mayavi
I am confused by the power sense of the white noise and gaussian white noise. Just look at the average powers of this two types of signals: 1) For white noise: Snn(f)=N/2 and the total power Paverage = infinity 2) But for Guassian white (...)
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 (...)
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 (...)
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
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. (...)
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 (...)
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
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
Hi everybody! Can you help me to write in matlab code a zero-mean white gaussian noise with variance=10^-4 Thanks so much!!
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...
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 (...)
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 (...)
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.
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
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
white gaussian noise mean that it got all the frequencies of the same amplitude
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
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 (...)
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 (...)
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
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
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 (...)
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.
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.
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
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 (...)
Hi. I need to design Additive white gaussian noise in verilog..can anyone help me out? Thanks in advance. Sudhir Dakey
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 (...)
In the awgn channel the noise added is gaussian as well as white noise... my question is whether gaussian distributed noises are always white noise....? is the vice versa is also correct...?
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) (...)
my take: Rvv = E{w(t1)*cos(2Πft1+Φ) * w(t2)*cos(2Πft2+Φ)} since w and Φ are indep, Rvv = E{w(t1) * w(t2)} * E{cos(2Πft1+Φ) * cos(2Πft2+Φ)} first term =1 , assuming w has unit power Rvv = E{cos(2Πf ((t1+t2) + 2Φ) * cos(2Πf(t1-t2))} * 1/2 first term evaluates to zero, assuming &
You need two independent white gaussian noise otherwise, the the noise received by the two receiver are coherent and no diversity gain.
which are white gaussian channel characteristic thank you for help
I need ,atlab file for link level simulation for single additive white gaussian noise (AWGN)
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)
encode the signal the modualtion at the rec
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 (...)
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 (...)
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?
Here's pseudo-random broadband white noise played to the speakers: wavplay(rand(10000,1) - 0.5) I don't know "sine-sweep excitation". Can you find more info? I don't know ASTM E1050.