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Recent content by iamaeag

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    BPSK BER in rayleigh IN MATLAB : why noise and channel is the same in matlab.

    Re: BPSK BER in rayleigh IN MATLAB : why noise and channel are the same in matlab. Hi mazdaspring, I am also new to the fading channel. Share my point of view with you, if y = A*x + n, where y is the received signal; x is the transmitted signal; n is complex AWGN with Re[n]=Im[n]=N(0,1); A...
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    Bayes_ML_MAP_receiver

    Hi pulsedia, The MAP(Bayes) receiver is already implemented from your code. You may see the following criterion. 1): MAP receiver: p(s|y) = p(y|s)p(s) / p(y). y = s+n. Where s is i.i.d signal, n is i.i.d. and AWGN, and y is the received signal...
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    PSK Eb/No Vs BER calculation

    1): I am not sure about it, are you asking how to use the calculator's error function ? 2): how about using matlab to solve erfc (Error function) or to approximate the Error function by Taylor series, or iteration method and etc. within the allowable error range? For the definition of error...
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    Why AWGN is additive?

    Hi Pals, I made some math calculations to the summation of two R.V.s. Please feel free to correct my answer. Thank you.
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    Why AWGN is additive?

    Hi David83, Indeed the transmitted is also a R.V. and may not forced to be Gaussian. The received signal can be view as summation of two R.V. But when we want to analyze the noise signal from the received signal, we need to know what type of the transmitted signal is, i.e. BPSK or FSK modulated...
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    Conventional I/Q demodulation and digital I/Q demodulation

    Hi Pals, Why conventional analog I/Q demodulation is still so popular? (Need two ADC) Applying digital I/Q demodulation can save one ADC. Is this not a strong reason to adopt to digital I/Q demodulation? Hope someone can help me to solve the above questions. Thank you.
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    Why AWGN is additive?

    Hi David83, For dealing with additive for AGWN, there are some experiments that you can check. For example, if X1 is Gaussian R.V. and X2 is also Gaussian R.V., you can derive the summation of two R.V. (Y = X1+X2) is also a Gaussian R.V. Based on this concept, you may record the noisy signal and...
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    Question to the spectrum characteristic of single-sideband signal.

    Hi Pal, The following question about single-sideband signal confuse me for a while. The attached files are my mathematical model. Please help me to solve my questions and fell free to correct my analysis. Q1, why the physical output spectrum measured by the spectrum analyzer is always...
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    Question: A linear representation of CPM

    Hi everyone, When I read the 4th edition of digital communication by Proakis, I can't figure out "a linear representation for CPM signal with (4.3-73)". I am so confused to math technique of 4.3-73. (How to derive the equation?) Hope someone can help me. Thank very much.
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    what is the fourier transform of this term

    Do you mean this? X(w)=∫(1/(pi*t))exp(-jwt) dt=ln(w)/pi (indefinite integral ).
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    Gated clock module for reducing power consumption

    Re: about Gated clock Hi, packet and hash_delay, I am also confused about why not use DFF for gated clock instead of D-LATCH. Even I knew clock_en signal need to be re-sync. at the negative edge of clock. I still wonder to know what is the advantage of using D-LATCH for gated clock. Below is...
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    Question: approximation to the norm of vector summation

    Hi htg, Thanks to your help. I will try this approximation latter.
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    Question: approximation to the norm of vector summation

    Hi~Pals I have a trouble about the math question. Please see the attached picture. Hope everybody can give me some suggestions. Thank you. Best regards.
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