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## Matlab Rayleigh Noise |

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17 Threads found on edaboard.com: **Matlab Rayleigh Noise**

i really need help with **matlab** code to create a basic 2x2 mimo system. I am a noob so please explain thoroughly. and i would also like to know how it can be changed to simulate a 4x4 etc. it doesnt need **rayleigh** fading or any **noise** as of yet. Just a basic mimo system. Thanks

Digital communication :: 02-15-2014 10:24 :: tajwar6 :: Replies: **0** :: Views: **709**

I am writing a **matlab** code about convolutional encoder. I have created trellis for 4,8,16 and 32 states and their corresponding viterbi decoder(using vitdec **matlab** function). My system goes like this:
Trellis Encoder-->DPSK Modulator-->**rayleigh** fading Channel + awgn **noise**-->DPSK Demodulator-->Viterbi Decoder
For the 4 (...)

Digital communication :: 07-02-2013 00:36 :: Sulav Timsina :: Replies: **0** :: Views: **297**

I am writing a **matlab** code about convolutional encoder. I have created trellis for 4,8,16 and 32 states and their corresponding viterbi decoder(using vitdec **matlab** function). My system goes like this:
Trellis Encoder-->DPSK Modulator-->**rayleigh** fading Channel + awgn **noise**-->DPSK Demodulator-->Viterbi Decoder
For the 4 (...)

Electronic Elementary Questions :: 07-02-2013 00:29 :: Sulav Timsina :: Replies: **0** :: Views: **320**

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 :: 04-22-2013 16:14 :: barznjy :: Replies: **2** :: Views: **677**

Help me for neural network code for predicting a the errors in **matlab** and to succesfully receive the transmitted bits at the receiver end in a channel which is affected by **rayleigh** fading and gaussian **noise**.

Digital Signal Processing :: 11-10-2012 14:04 :: deba21 :: Replies: **0** :: Views: **780**

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** (...)

Digital communication :: 03-19-2012 13:52 :: jilly0124 :: Replies: **1** :: Views: **635**

Can any one tell me what is the difference between fast and slow **rayleigh** fading channel?
And how can I represent them be **matlab**?
Thanks in advance

Network :: 01-30-2012 13:04 :: k2121 :: Replies: **4** :: Views: **2606**

I have a look on people's **matlab** on BPSK BER over **rayleigh** channel.
I don't understand why **noise** and channel are the same as shown below. so **rayleigh** channel is the same as **noise** then?
Can anyone explain it to me please.
**noise**=1/sqrt(2)*(randn(1,N)+1i*randn(1,N)); %AWGN (...)

Digital communication :: 06-27-2011 12:04 :: mazdaspring :: Replies: **2** :: Views: **1998**

Hi,
According DVB-T demo in **matlab** Communication block set, it is a fair simulation model with not having guard interval and so on. But we can simulate in AWGN **noise** and this shows zero BER. But after i modified by inlcuding **rayleigh** Multipath channel the BER is increasing to 0.5. That means i need to add something at the reciver (...)

Digital communication :: 12-19-2010 13:22 :: ckrisasa :: Replies: **5** :: Views: **1640**

I have an assignment on mobile communications and it's on Matalab and I need some help on some of the components that make up the code.
I need to create a component that generates information bearing bits from the binary set {0 1}. Every 200 bits should form a frame.
Also, I need to create a QPSK modulator that maps two binary bits to QPSK sy

Digital communication :: 11-07-2010 09:01 :: nayia :: Replies: **0** :: Views: **2441**

Hi
am using **matlab** 2007, what is "modulate(modem.pskmod,x)" ?
can't u use directly pskmod? that is what i used in your code and obtained err of 50%, still very high....
so i suggest u use an equalizer onteh received signal before demodulating to reduce the efffect of the channel.

Digital communication :: 07-24-2011 23:29 :: Sherra :: Replies: **4** :: Views: **2413**

Hi all,
I am trying to simulate different fading channels in **matlab** (**rayleigh**, Nakagami, Log-normal). I have done the **rayleigh** but need some help with the Nakagami and Log-normal Fading.
For the **rayleigh** Case I have
% **rayleigh** fading
X = sqrt(0.5)*( randn( 1, symbols_per_frame) + j*randn( 1, (...)

Digital communication :: 12-17-2009 16:54 :: hongsiying :: Replies: **0** :: Views: **1889**

simple question >>>
when we model **rayleigh** channel
we use in **matlab** this command
h = 1/sqrt(2)*; % **rayleigh** channel
also we can use the distribution of **rayleigh** channel which is very known
p(gama)=(1/gama_ave).*esp(-gama/gama_ave);
so what is relation between two commands ?
thanks

Digital communication :: 05-22-2009 04:52 :: matlab1983 :: Replies: **2** :: Views: **673**

Hi,
Could you please help me how to use the Maximum Ratio combination in Multipath **rayleigh** fading channel, using **matlab** comands, and have a look for the program bellow you will see the error that I have, and could you tell me the problem, and how to solve it.
clear all
whos
SNR=0:2:20; %Range of **noise** in dB.
M=2; % DBPSK (...)

Digital communication :: 11-28-2007 09:56 :: Shwan :: Replies: **0** :: Views: **1838**

Could anyone please help me about the **matlab** code simulating the **rayleigh** fading in which having the white guassian **noise** and the doppler filters?
Also,it will be very thankful if you could explain me some brief idea about it.
^__^"
Read the Simulink PDF - it comes on the CD. It exlains it. It is NOT easy t

Digital communication :: 11-25-2007 19:45 :: ds18s20 :: Replies: **2** :: Views: **1606**

I am trying to simulate a 16 QAM modulation in **rayleigh** channel. However the BER is always around 0.5 no matter the Eb/No is.
The channel model I am using is:
ch=1/sqrt(2)*(randn(N,1)+sqrt(-1)*randn(N,1)); where N is the number of bits.
**noise**=1/sqrt(2)*(randn(N,1)+sqrt(-1)*randn(N,1)); is the AWGN.
s_hat=sqrt(snr(k)).*abs(ch).*X + nois

Digital communication :: 02-28-2007 10:19 :: leony :: Replies: **3** :: Views: **3834**

Hi all,
I have got a **rayleigh** Fading Channel Simulation code by **matlab**.
The code list below:
% **rayleigh** fading
a = sqrt(0.5)*( randn( 1, symbols_per_frame) + j*randn( 1, symbols_per_frame) );
% complex **noise**
**noise** = sqrt(variance)*( randn(1,symbols_per_frame) + j*randn(1,symbols_per_frame) );
% (...)

Digital communication :: 03-06-2006 04:19 :: davyzhu :: Replies: **19** :: Views: **26430**

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