Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.
Hi there,
I am not sure about the notations used in the above mentioned proof. If you want to use DFT to find linear convolution of x and y, then take the DFT for x and y of 2N-1 samples (by zero padding). This will give a 2N-1 size DFT of z which can be used to find the sequence z.
Hope this...
Hi
In order to do error correction of even a single bit you require minimum distance of code to be at least 3. By Hamming bound you can easily find that for un-coded data length of 8 bits, minimum redundancy required is that of 4 bits. So, you cannot correct errors with only three bits of...
Hi
I did not simulate your code. But it seems that 'teta' variable should have value either 0 or 1. You can use teta=randint(1,96); and see if you get your desired waveform.
MHanif
Hi
Kindly note that \[var(aX) = a^2 var(X) \]. So, multiplying by \[\frac{1}{\sqrt{2}}\] scales variance by \[\frac{1}{2}\]. Thus total variance is (1+1)/2=1.
Hi
I think total BER is total bits in error divided by total number of bits. So, if you are using 16-QAM and 32-QAM and for example you transmit 20 symbols from two transmitters. So, total number of bits transmitted are 4*20 + 5*20 = 9*20. Now if BER for 16-QAM is say 1/40 and that of 32-QAM is...
Hi
It is just to keep variance of each sample to be one. randn() function in MATLAB results in a Gaussian noise with zero mean and unit variance. So, variance of randn() + j randn() would be 2 and to keep its variance to be 1 a scaling factor of 1/sqrt(2) is multiplied.
Hope this helps
Hi
Kindly elaborate your question. As far as I understand your question is that you are simulating OFDM system and you want to detect OFDM signal based on received signal energy. If signal energy exceeds the threshold you declare OFDM signal to be present otherwise you declare that no signal is...
Hi Nego
Linear block codes can be represented as
\[c=mG\]
where \[ G \] is the generator matrix. Another way to characterize codes is by the 'parity check matrix' which is the matrix of basis of codes orthogonal to the codes \[c=mG\] i.e.
\[cH^T=0\]
Just multiply the receive code word by...
Hi Stani
The optimum detector of ASK is the average filter. If you are using Binary ASK and your levels are say 0 and 1. Then what will you do is to perform average on the received 'symbol' (which means you have done synchronization and you have multiple samples representing one symbol either 1...
I failed to understand your question. May be you are asking about semilogy() function in MATLAB. Just type doc semilogy, you will get all the required information. If you want to plot BER plots of standard modulation schemes, then you can also use bertool.
MHanif
Hi TomJohn,
Inphase and Quadrature components of a passband signal, s(t)=A*cos[2*pi*fc*t+theta(t)] is
I(t)+jQ(t)=A*cos(theta(t))+j*A*sin(theta(t))
as
s(t)=I(t)cos(2*pi*fc*t)-Q(t)sin(2*pi*fc*t).
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.
