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Recent content by ahmed_nasr

  1. A

    I need a simple tutorial for embedded systems and RTOs

    rtos tutorial hi can anybody provide me with this ?
  2. A

    I need good material on SS7

    Hi guys , I need good , explanatory and easy to start with material on SS7 ... I need it to give a good overview of the topic , not too shallow and not too deep Best Regards
  3. A

    Question about OVSF codes in UMTS

    umts questionary Thanks for the piece of info ... I read a few books on UMTS and couldnt find such an answer ... could you recommend me some usefool reference ?
  4. A

    Question about OVSF codes in UMTS

    ovsf umts Hi folks , I know OVSF codes are used for channelization in UMTS , I'd like to know , in a normal voice call , is the same OVSF code used for uplink and downlink ? Also in which channel are the OVSF codes assigned ? is it the FACH ?
  5. A

    What's the relation between TX power and data rate in UMTS ?

    power data rate relation Hi fellows , I would like to know if I have certain data to be transmitted , should the Node B increase the power if the data rate increases ? Also I read the following in a reference about the RACH trasport channel : Why RACH should be transmitted with low rate ?
  6. A

    In GSM , is Ki specific for each subscriber ?

    kc ki gsm so ... any help ?
  7. A

    In GSM , is Ki specific for each subscriber ?

    gsm where is ki stored Hello there , Can anybody help me with this ? I mean is Ki (used in the authentication ) user specific , that is each SIM card has a different Ki and the AUC uses the Ki specific to each user using IMSI-Ki mapping or what's the deal ? If anybody has a nice explanation...
  8. A

    how do i implement channel multiplexing in MATLAB??

    using the MUX simulink block !!!
  9. A

    linux fundamentals tutorial

    ok can u plz upload or send on my mail : a7med.nasr(a)gmail.com thanks
  10. A

    linux fundamentals tutorial

    isnt there any books or pdf's .... i prefer those to video tutorials
  11. A

    linux fundamentals tutorial

    hi , i know nothing about linux , so plz i need good tutorial to start with and the sources that i'll need .... also what kind of linux would be suitable for me (redhat , suse , fedora core ... ) ?
  12. A

    channelization and scrambling

    in downlink , channelisation codes are used to distinguish different channels from same basestation ,while scrambling codes distinguish different basestations in uplink , scrambling codes distinguish different users (mobiles) while channelization codes distinguish different channels from same...
  13. A

    How to calculate a minimum required |Vds| of a mos

    for NMOS to be in saturation --> Vgd must be ≤ Vthn .... i.e Vds ≥ Vgs -Vthn for PMOS to be in saturation --> Vdg must be ≤ |Vthp| .... i.e Vds ≤ Vgs + |Vthp| i.e Vsd ≥ Vsg - |Vthp| i.e |Vds| ≥ |Vgs| - |Vthp|
  14. A

    Materials about power amplifier, feedback amplifier, and stability and oscillator

    best book about electronics hxxp://rapidshare.de/files/32692049/MicroelectronicCircuitsbySedra_Smith5th.part5.rar hxxp://rapidshare.de/files/32692033/MicroelectronicCircuitsbySedra_Smith5th.part4.rar hxxp://rapidshare.de/files/32691971/MicroelectronicCircuitsbySedra_Smith5th.part3.rar...
  15. A

    What is coherent bandwidth, ISI and equalization?

    Comm. question first , i dont know what do u mean by coherent B.W .... coherent comm. system is a type of comm. systems in which we must have carrier at the Rx for demodulation ... the B.W for this sytem differs from that of noncoherent system about ISI it stands for InterSymbol Interference...
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