Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

Recent content by Ahmed Alaa

  1. Ahmed Alaa

    Peak to Average Power Ratio in OFDM

    Hi ll, I want to know whether AWGN affects PAPR in OFDM ? I am doing some simulations for the PAPR and found that it is insensitive to the SNR. Is this logical ? I think that when a gaussian random variable is added to OFDM samples
  2. Ahmed Alaa

    Cyclic prefix interpretation in frequency domain

    Dear all, In the frequency domain, OFDM maintains orthogonality because nulls of adjacent subcarriers are co-located with the maxima of targeted subcarriers. However, adding CP and keeping subcarrier spacing will cause the nulls to be shifted and orthogonality seems to be not maintained !! I...
  3. Ahmed Alaa

    change in OFDM bandwidth

    addition of CP only decreases the bandwidth of individual subcarriers but the overall allocated OFDM bandwidth depends on the subcarrier spcaing and this is not affected by CP. Decreasing subcarrier bandwidth while maintaining subcarrier spacing decreases BW efficiency because you allocated more...
  4. Ahmed Alaa

    About gain of Rayleigh fading channels

    paths add constructively and destructively with equal probabilities, thus the channel gain varies about the mean channel gain -> 0 dB (gain = 1).
  5. Ahmed Alaa

    uniformly distributed random number from 0 to 2*pi in MATLAB

    Re: uniformlydistributed random number from 0 to 2*pi in MATLAB Angle = (2*pi) * rand(1,10) is correct why aren't you convinced ?
  6. Ahmed Alaa

    Equalization Problem: Where to start from?

    You have to estimate the channel first then equalize it, many algorithm already exist: ZF, MMSE, DFE, ..etc
  7. Ahmed Alaa

    what is the difference between mutual information and capacity in flat fadding channe

    Capacity is the maximum possible mutual information for all input probability distributions. This is applicable for fading and AWGN channels ....
  8. Ahmed Alaa

    Rayleigh Fading Channl

    use rayleighchan() MATLAB function directly.
  9. Ahmed Alaa

    Rayleigh multipath channel simulation

    you can simply use rayleighchan() MATLAB function
  10. Ahmed Alaa

    binary phase shift keying demodulation

    Generate 1 for binary 1 and i for binary 0, add complex noise, and decide 1 if the real part of the received signal is greater than the imaginary and vice versa.
  11. Ahmed Alaa

    [SOLVED] Outage Probability : How to derive

    You need to get the Cumulative density function of the parameter you are getting the outage for (BER, FER, C/I, ..etc) and then Outage at certain threshold = CDF(threshold).
  12. Ahmed Alaa

    GSM C/I to FER Mapping tables

    Dear all, I want to interface system level results (C/I) to link level results (Frame Erasure Rates), so I need some mapping tables and statistical link level results/ curves for GSM link level performance (BER vs. C/I and FER vs. BER). Does anybody have link level mapping tables ? Thanks.
  13. Ahmed Alaa

    Rayleigh flat fading assumptions

    No, this is the only assumption.
  14. Ahmed Alaa

    parallel to serial conversion using matlab simulation

    use reshape function.
  15. Ahmed Alaa

    Does OFDM change the bandwidth , spectral efficiency and BER ?

    Re: questionn about OFDM Bandwidth is reduced due to overlapping spectra of different subcarriers in frequency domain. Regarding BER, in AWGN, you'll find that the BER is nearly the same but in fading channels, it depends on the equalization technique you're using.
See more

Part and Inventory Search

Back
Top