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Recent content by cwjcwjcwj

  1. C

    Constellation graph problem

    First of all, it is not called constellation graph. It is called constellation diagram or just signal constellation. Do you have a channel between tx and rx? Say, AWGN or fading?
  2. C

    Constellation graph problem

    What signal constellation do you expect? You will not get a 16-QAM signal constellation if you check the signal after OFDM modulation.
  3. C

    when to apply pulse shape filtering

    Pulse shaping should be implemented on transmitter side and not the receiver side if I not mistaken. The reason of using pulse shaping is to shape the transmitted pulse.
  4. C

    [question] problem with real OFDM spectrum

    1). Do you have a block diagram of how the OFDM signals generated? 2) Do you have a simulation model (Matlab,etc)? If so, try FFT the OFDM signals and have a look on the spectrum.
  5. C

    [question] problem with real OFDM spectrum

    Yes. You should. Let me know if that doesn't work.
  6. C

    [question] problem with real OFDM spectrum

    Do you mean you generated OFDM signal using FPGA and used on-board DAC to convert digital signal to analogue signal. And plot the spectrum using spectrum analyzer? Did you add Q-component and I-component signals together?
  7. C

    verilog code for bit error rate testing

    Interesting request. I doubt if someone could help you. Also, you are too lazy to write your request and explain about what you want!
  8. C

    PAPR reduction using SLM

    The whole idea of SLM method is to generate a set of alternative data blocks and select the one with the lowest PAPR to transmit. Say, your original data has a PAPR of 12 dB and you multiply your original data with 4 phase sequences which yields 4 set of different data blocks. Let say one of the...
  9. C

    beginner in embedded linux

    Try this emulator - QEMU.
  10. C

    beginner in embedded linux

    Get a Raspberry Pi. That would helps.
  11. C

    CDMA implantation micro or FPGA OR DSP

    For microcode, we rarely use a general purpose processor for DSP application. Digital signal processor will be better for this application.
  12. C

    MIMO system @ 26 GHz.

    it is on microwave link application. Max. tx power around 20 dbm. receiver sensitivity around -70 dbm. Modulation scheme is 256 QAM. Air link throughput 700 Mb/s.
  13. C

    CDMA implantation micro or FPGA OR DSP

    It really depends on your application. Is it for high data rate application? FPGA will normally be selected if your application is high data rate. If it is not, go for DSP.
  14. C

    Is FPGA process sequential?

    No, it is not sequential. They work in parallel and they are digital hardware (not like C++/C). Search for RTL to understand how FPGA works. There are millions of tutorial on internet.
  15. C

    MIMO system @ 26 GHz.

    Is there anyone has experience designing MIMO system for 26 GHz? Why we should avoid using technique like VBLAST at 26 GHz? Also, why cross polarization technique is so popular at this frequency?
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