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Hello all,
I have extracted features of certain signals and classified these signals based on comparing with the features with a fixed threshold... But now I have to vary my threshold according to snr. i.e as my snr changes my threshold values should also change. How can I do that? The range of...
Hello all,
The received signal for AWGN channel model is
yk=h.xk+nk where k=1...K
Where xk denotes transmitted signal, h is the channel coefficient. Here h=1. nk is noise signal having variance N.
and
the received signal for Rayleigh channel model is
yk=h.xk+nk where k=1...K
where h is...
Hello all,
I have written following matlab code for calculating the mean and standard deviation of x but I am getting an error for mean and standard deviation as NaN (Not a number). Kindly help. What is wrong with my code.
clc;
close all;
clear all;
x = [4.2426 + 3.1659i
2.2956 +...
Hello,
I have written a matlab code for snr estimation based on M2, M4 and M6 moments for 16 QAM signal. I am not able to get the estimated value of snr. Kindly have a look at the code and let me know what is wrong. I have also attached a doc file for your reference. The code is pretty easy to...
Hello,
I have roots of a 4th degree polynomial. Now i have to obtain the value of new snr value from these roots. But I have 4 roots so which value of root shall I consider my new snr estimate value. Which root out of these 4 roots will be the new SNR value?
Thank you for the help.
Shruti
Hello all,
Can anybody explain me the meaning of multilevel constellations? For BPSK, in the constellation diagram, we have 2 symbols i.e. 1 symbol per bit is transmitted. For QPSK, we have 2 symbols per bit. But I am not able to understand what is multilevel constellations.
Regards,
Shruti
Hello,
I have attached a reference paper for "Spectrum based SNR estimator". I need a slight modification in the algorithm used in the reference paper. Can anybody help me by suggesting me few modifications or any new idea on how to calculate snr of digital modulated signals.
Regards,
Shruti
To identify the set of digitally modulated signals, parameters such as mean, moment, cummulants are extracted from information of signal. By comparing the parameter value of the signal with a certain threshold, the digitally modulated signal is identified. So in this context, I need few ideas on...
Hello,
I have taken 100 samples of each modulation scheme i.e. AM, FM and PM. Now I have extracted one parameter to distinguish between one class containing AM and other class containing FM and PM. Now I want to compute the threshold value for this parameter using confusion matrix of true...
Hello,
My code for AM modulation is as follows:
t=0:0.001:1;
A=5;%Amplitude of signal
fm=input('Message frequency=');
fc=input('Carrier frequency=');
mi=input('Modulation Index=');
Sm=A*sin(2*pi*fm*t); % Message Signal
Sc=A*sin(2*pi*fc*t); % Carrier Signal
Sam=(A+mi*Sm).*sin(2*pi*fc*t); %...
Hi,
I would like to know how did you calculate unwrapped phase. Can you explain me that part? I went through it but i din't understand. Kindly explain.
Thanx
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