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Recent content by chessmath2009

  1. C

    Estimating Frequency in PLL from estimated phase

    I am sorry can you elaborate about this things? I do not have any divider by N in my PLL and I would like to estimate the frequency of the signal based on estimated phase. I have only phase detector, loop filter and VCO (NCO).
  2. C

    Estimating Frequency in PLL from estimated phase

    Hi Assume I have a digital PLL that outputs phase estimate of the reference signal, however I am wondering can I estimate the frequency of reference signal according to the given phase estimate? I know frequency is derivative of phase respect to time but dont we need a operating or center...
  3. C

    Why do we need to over sample signal in raise cosine filter?

    Yes, I mean raised cosine used in digital communication.
  4. C

    Why do we need to over sample signal in raise cosine filter?

    Hi I would like to do know why do we need to do oversampling in a raise cosine filter. What will happen if we do not do oversampling? I need to know what this oversampling factor does? the higher is better or the lower?
  5. C

    Modulation with ADC and DAC

    Thanks I know that I already implemented the code. I am wondering if I want to use data acquisition toolbox in Matlab to do the Analog to digital converter or vice versa where should I apply them. For example lets say I multiply my rectangular pulse by carrier should I apply DAC now ?
  6. C

    Modulation with ADC and DAC

    Yes since later I will have channel that is continuous so now I need to know this. I just need to know where exactly I should apply DAC and ADC.
  7. C

    Modulation with ADC and DAC

    Hi I have written Matlab script for BPSK modulation. The way my code works is as follow: series of 0 and 1----> NRZ data (continuous rectangular pulses with amplitude -1 and 1)--->multiply by carrier----> add noise--> multiply by carrier---> integration--->detection---> Bit Error collection...
  8. C

    Data rate rate as a function of SNR and bandwidth

    I have a band limited channel before AWGN channel I belie this is effect of ISI. What do you think about this?
  9. C

    Data rate rate as a function of SNR and bandwidth

    Yes. Simulation is done over AWGN channel.
  10. C

    Data rate rate as a function of SNR and bandwidth

    Thanks I will post the detail of my system as well. Just one question that I still need to know. What is SNR in the above equation? Since in Matlab we loop through eb/No can I use those values for SNR ? should I convert it by multiplying by data rate and divide by bandwidth? Thanks.
  11. C

    Data rate rate as a function of SNR and bandwidth

    Thanks. I have SNR =32 for BER=0.01. Therefore I cannot achieve this capacity is that correct? what modulation scheme do you suggest ?
  12. C

    Data rate rate as a function of SNR and bandwidth

    I plotted BER vs SNR for BPSK modulation in Matlab and I am given bandwidth of channel (bandlimited channel). lets say it is BW1. I would like to find the data rate based on this information. I am using Shannon capacity formula: Therefore C=BW*log2(1+SNR). However I wonder for this equation...
  13. C

    Relation between data rate and carrier frequency under BPSK modulation

    Hi I have seen in different simulations for BER vs SNR under BPSK modulation, the relationship like Rb=2*Fc where Rb is the data rate and Fc is carrier frequency. Can anyone please tell me what is the justification behind these formulas? How can I relate data rate(bit rate ) to carrier...
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