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Recent content by Shruti01

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    snr based dynamic threshold

    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...
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    Difference between AWGN channel and rayleigh fading model

    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...
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    error in matlab code for mean and standard deviation

    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 +...
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    [SOLVED] M2M4M6 moments based snr estimation

    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...
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    [SOLVED] SNR estimation using roots of a polynomial

    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
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    need help in division of polynomials

    I have posted my problem in the attached file. Thanx for the help.
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    What is multilevel constellations

    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
  8. S

    need modification in the algorithm used in reference paper

    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
  9. S

    Optimal threshold determination method

    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...
  10. S

    Optimal threshold determination method

    I have extracted few parameters of a signal. I wanted few ideas/methods to determine threshold of these parameters.
  11. S

    Optimal threshold determination method

    I need few ideas on how to determine threshold of the features.
  12. S

    Optimal threshold determination method

    hello, can anybody give me ideas on how to determine optimal threshold. regards, shruti
  13. S

    help in determining threshold value

    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...
  14. S

    need help in generating plot of SNR vs standard deviation

    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); %...
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    Digital modulation feature extraction using unwrapped phase

    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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