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Type: Posts; User: kalyanasv

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  1. Replies
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    Closed: Re: WIMAX using STBC technique model in MATLAB

    Hi,

    You can start with looking at this website STBC, and further develop the WiMAx code based on the protocol.

    Have fun!
  2. [SOLVED]Closed: Re: Computer Architecute lite Single cycle MIPS design problem

    Hi,

    Have you tried using a signal trace tool like Modelsim, VCS, Questa....etc to see how the signal are changing?
    (Highly recommended) (If you have then attach the waveforms, they would be...
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    Closed: Re: Assist GPS (A-GPS, U-blox)

    Hi,

    As klystron mentioned you need to give a approximate location of the unit. As with u-blox, I presume you have gone through this link. Typically inthe event of warm start or hot start you...
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    Closed: Re: Exception error from Xilinx ISE

    Hi,

    There are a multitude of possibilities for ISE throwing an error as such.

    i) Are you using a core function corresponding to an ip?

    ii) As you mentioned the design might be too large to...
  5. Closed: Re: Uniquely Decodeable Code Weak vs Strong Def

    You are correct this is not true. i.e. it does not a UD code for this particular type of code. For equilength codes this criteria works better. (i.e. reasonable good assumption for ECC but doesn't...
  6. Closed: Re: Matlab code for Bit error rate of turbo coded ofdm system on AWGN channel

    Can you post the exact code? tell what you did exactly...and we could go on from there.
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    Closed: Re: awgn channel for wireless optical channel

    the gaussian channel is modeled by considering noise as a gaussian variable. Typically you vary the variance value over a range to analyse how your channel performs over different variance values....
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    Closed: Re: Is high Z same as floating?

    High Z is not floating. Floating can be any state more like a "X". Whereas high Z is high impedance state, check for its usage in tri-state buffers as an example for a better understanding.
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    Closed: Re: Clock Generation Verilog/VLSI

    Conceptually Yes, but create an extra MSB bit so that your using only 1 bit combinational logic. Time wise I suggest you compute the number of bits according to your requirement.

    Finite State...
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    Closed: Re: Clock Generation Verilog/VLSI

    Hi,

    Firstly considering your using a FPGA is rather an overkill you could use a simple 8051 microcontroller to do the job.
    Nevertheless, you have a 10KHz clock and get a sample every 10 mins =>...
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    Closed: Re: The difference between two constellations

    Hi,

    Your comparison is between i) 16-QAM ii) 16-APSK.

    Firstly do pay heed the answer is only correct for linear channel models.

    The explanation for the answer , the problem with having 16...
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    Closed: Re: Generating W-CDMA or SC-FDMA-QAM I/Q data

    Hi,

    The simplest is to use Simulink to generate WCDMA. Other options include specific Matlab, Octave code.
    Further there are also C++ codes. All depends on your budget and time limitations.
    All...
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    Closed: Re: adding noise to an oversampled ofdm signal

    Hi,

    The SNR definition there you can look at it as SNR_bit=Eb/N0=(SNR_symbol)*(W/R), where R is your rate and W is the bandwidth.
    Now, you for R = Symbol Rate * modulation = (20*W*log2(M)), here...
  14. Closed: Re: Urgent,please help me about covariance matrix pf channel

    To compute the covariance take the sample vector cov(rx) will give the covariance matrix of the signal. The diag(cov(rx)) will provide the variance values for that signal.
  15. Closed: Re: help in ask modulation and demodulation in matlab

    Hi,

    I presume your considering 2 samples per bit,

    firstly you want to ensure your 'd' variable corresponds to two samples per bit. i.e., you want to ensure d(2*i-1) and d(2*i) are the same for...
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    Closed: Re: Improving OOK demodulator

    Looks reasonable, using the mx is one possiblity the other being using the 2-norm of the matched filter.

    Have Fun!
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    Closed: Re: Improving OOK demodulator

    the rationale you have is ok. the only thing with matched filtering is it involves convolution of your samples than a simple addition. The rationale is purely mathematical and can be found in any...
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    Closed: Re: Improving OOK demodulator

    i) if you hardware can support 3 samples, I would take all 3 samples and average it out for a better result. integration using a capacitor is a good idea but ensure the capacitor is able to discharge...
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    Closed: Re: Improving OOK demodulator

    Firstly, I am no expert at this. but it looks like you have coherent Tx/Rx communication system.
    Do you when the light pulse occurs exactly? (if you do: then it would be a determined system and...
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    Closed: Re: Help with MSK modulation

    i) your idea for carrier formulation seems mathematically right.
    ii) GMSK techniques are available widely GMSK.
    GMSK implies your using a gaussian pulse shaping instead of the half sinusoid, so...
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    Closed: Re: Help with MSK modulation

    MSK is pretty straightforward using matlab: MSK. You can also develop the code since it is a simple multiplication of sines and cosines to the data to create continuity. The details of which, can be...
  22. Closed: Re: Coded vs uncoded performance of Reed-Solomon codes

    I certainly do not understand an empirical 3 in that equation:

    but If you look up the matlab website: SNR

    you will note that the SNR=Eb/No+10logk-10log(Tsym/Tsamp)

    where the last term...
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    Closed: Re: Snr calculation in satellite

    SNR computation for APSK is not as clearly defined as the QPSK or the QAM. depending on the distance between symbols required you can use euclidean geometry to arrive at a the final theoretical...
  24. Closed: Re: Coded vs uncoded performance of Reed-Solomon codes

    Box muller is a direct method to generate gaussian random numbers like the "randn" function in matlab. Using matlab just use randn and generate the gaussian noise.

    The precision and the curve you...
  25. Closed: Re: Coded vs uncoded performance of Reed-Solomon codes

    Hi,

    I would suggest looking at any good Digital communication book e.g., Sklar, Lindsay and MK Simon, Haykin, Proakis all of them detail the exact steps you will need.

    Nevertheless, to start...
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