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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
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.
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 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
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 everybody! Can you help me to write in matlab code a zero-mean white gaussian noise with variance=10^-4 Thanks so much!!
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 (...)
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
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 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
which are white gaussian channel characteristic thank you for help
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 (...)
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
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
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?
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.
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
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
what if we use two noises 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 noises? Also if we use two noises do we have to normalize the power of (...)
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 (...)
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
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
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 (...)
i want to add white noise to EEG signal plz tell me the solution
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
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)))
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 (...)
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
A bit confused by the thermal noise spectrum: people say thermal noise is white, i.e., it has same amplitude (power) through the whole frequency spectrum. But it's also said that thermal noise has gaussian distribution. Isn't this a conflict? Thanks for clarifying this issue.
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. (...)
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
1. Matched filters : used in receivers to extract out the signal content. 2. AWGN It stands for additive white gaussian noise. This is the standard model for noise for many communication channels. 3. Linear Modulation This a modulation techniqu
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 (...)
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 (...)
encode the signal the modualtion at the rec
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)
I need ,atlab file for link level simulation for single additive white gaussian noise (AWGN)
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 (...)
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 (...)
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) (...)
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.
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...?
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 ----->
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 (...)
Hi. I need to design Additive white gaussian noise in verilog..can anyone help me out? Thanks in advance. Sudhir Dakey
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 (...)
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.
maybe it's because the noise (thermal, white, gaussian) is directly proportional to the system's bandwidth
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 (...)
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