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Recent content by salam2000

  1. S

    design a transmitter/ receiver. help me

    I want design a transmitter and receiver for long distance range in S band (2 to 4GHz except ism band 2.4 Ghz) with rate of 1-2 Mbps . how design do you propose? 1)software definition radio? 2) IC based implementation? how is the complexity of either? is it better I use FPGA or DSP or CPLD? how...
  2. S

    What values are usually taken for Doppler shift in Hz for WiFi systems?

    Re: WLAN model channel in wireless, doppler is modeled by a function like: 1/(π*fd*sqrt(1-(f/fd)^2) ) where f is frequencis between than ±fdmax.
  3. S

    I need solution manual of adaptive filter farhang boroujeny.

    Hello Dears, I need the solution manual of this book: Adaptive filters Theory and Applications by farhang boroujeny. if one have pdf of it, please share me, kindly. Thanks a lot
  4. S

    IDE 2 USB Converter? (CD/DVD port)??

    ide2usb Hi every one, 1-Does any one know, IDE2USB converters how work? 2-have they some hardware or they are a two wire cable? Thanks
  5. S

    Can quadrature modulation be implemented with VHDL in FPGA?

    Re: I/Q Modulation [hlp] yes, in VHDL or Verilog the implementation of Complex signals is done in two real part separately (r_p,i_p) and then result combined in output as: r_p+j*i_p.
  6. S

    Space-time coding\MIMO multiple antenna systems

    cooperative multibeamforming in ad hoc networks removed! take a look at this book: Fundamentals of Wireless Communication by David Tse. It is freely available on the internet: **broken link removed**
  7. S

    Vector Spaces in linear algebra

    1- this is clear. we use from contradiction that if m>n then subspace isn't independent and is dependence. 2-if for example in XY coordination, if a1X+a2Y=0; then a1=a2=0; also you can set another two basic vector in this cordinate. 3- the Gram schimtd method for find basic univector.
  8. S

    Channel Model for MIMO

    1-we usually suppose the channels are uncrollated, where in practice we must provide the conditions. 2-the existed relation in MIMO reference book, contain a Bessel equation part where it is zeros or small when the space between antenna be at least landa/4 or coefficients of it.
  9. S

    What is Diversity in term of MIMO

    take a look at this book: Fundamentals of Wireless Communication by david tse. It is freely available on the internet: **broken link removed**
  10. S

    How to find a square root of a large number?

    Re: square root??? This is no complex. you can in first step select (70^2)<5432<(80^2) Then Y=(5432-4900)/(2*70)=3.8 Then 70+3.8=73.8 you can with a loop decrease the error and increase your certainly.
  11. S

    Channel Model for MIMO

    removed! channel coefficients: (exp: exponential or SUI4 or Cost207 or ...).
  12. S

    How to find a square root of a large number?

    Re: square root??? there is a solution maybe useful: if we have a lookup table from square of number in domain of need, then we choose two square so that our number be between them, example: (73^2)<5432<(74^2) then we choose form two threshold X1=73 & X2=74 nearest number to our number...
  13. S

    [urgent] Matched filter (Pulse shaping)

    we said nsamp=fs/symr=7.5 as an example. this factor can be a number p/q=7.5223486643455778644356746746... for example. but I think two ideas where two have owns problems: 1- we use a Pulse shaping with a lot of coefficient, then we use quantization and set a offset for choose coefficients...
  14. S

    [urgent] Matched filter (Pulse shaping)

    hi I have a project for design receiver. the fs/symbolrate is irrational, examp =7.5 sampel per symbol. I want to add the matched filter, please help me to add it. I use interpolation and timing recovery in a loop. 1-where I replace MF? If I should take it before loop or in the loop with...

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