Any relevant info on shot noise?

shot noise matlab

Can anybody advise on how I maybe able to simulate shot noise or provide links to good resources. Also I am looking into simulating AWGN and Rayleigh fading. Any relevant info would be much appreciated.

Shot noise is current variations. In a SPICE type simulator you could use a resistor to generate noise and then an ideal voltage controlled current source. These type sources are a device type in the SPICE devices.

About AWGN and Rayleigh fading Simulink Communications blockset helps you.
There are special configurable models for these.

Thank you for your response

GroundCtrl: I managed to simulate AWGN and Rayleigh fading in matlab. However, I am not sure if the results produced are absolutely random or whether they are simply pseudo random.

flatulent: I am right in believing that resistor must have a gassian noise distribution. I think I am still confused about the the simulation. Do you know of any good internet resources

Mc Psalms

reg. AWGN and rayleigh fading channel noises, if u are to simulate using matlab,

then,

AWGN is an additive noise, u would know. generate a signal x say of length 1000,
then the corrupted signal with AWGN is,

y = x + randn(1,1000) ; where 1,1000 will generate gaussian noise with 1 row and 1000 values.

reg. rayleigh noise, its multiplicative in general as opposed to the AWGN, so generate this noise and just multiply instead of adding. in general, for a communication system, channel is rayleigh and in addition to that, thermal noise exists.. so u have to multiply and add..

rayleegh fading noise...

y = x * randn(1,0000);

comm system,

y = x * randn(1,1000) + randn(1,1000);

incase, i misunderstood ur question/ u need something other than this, pls reply this post!

/cedance

Thank you for your response

GroundCtrl: I managed to simulate AWGN and Rayleigh fading in matlab. However, I am not sure if the results produced are absolutely random or whether they are simply pseudo random.

flatulent: I am right in believing that resistor must have a gassian noise distribution. I think I am still confused about the the simulation. Do you know of any good internet resources

Mc Psalms

hi,

what is your confusion on actually? u failed to mention it in your last post. what resources do u exactly need from internet? code or theory? if code, then what exactly are u tryin to design? coz u just have asked abt the different channels and noises.

btw, matlab commands u use are seldom perfect random. they are either uniformly distributed as incase of rand(1,n) or gaussian incase of randn(1,n). i dont think there is a perfect all random number generator discovered yet! dont know thou. may be u could design your system with probability assignment of the rate of repitition..

pls explain a little more so that i would do the need ful.. to my potential.

/cedance

PS: donot post a thank you message as a reply. if u find a reply useful, its better to use the helped me button. a more betterway of showing ur gratitude. its meant for teh same! good luck

Basically shot noise is thermal noise ,hence resistors can be used to model it. Try using frictional analysis also.

Okay, I am basically doing some research on the noise found in communication systems for a y assignment. I am required to talk about Rayleigh fading (slow & fast), AWGN, Shot noise and how they are simulated. I am finding it difficult understanding how to discuss the methods used to simulate shot noise.

I have come across many examples for simulating AWGN and Rayleigh fading. In particular, using Jakes sum of sinusoids for rayleigh fading and adding a random variable to a transmitted signal to produce the affects of AWGN.

I do not necessarily need code. But an understanding how code could be used would be useful.

Psalms

All random noise has a flat spectrum and therefore a gaussian amplitude probability distribution.

Some communication books has that topics.