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Recent content by Preben

  1. P

    How to make an OFDM/OQAM transmitter and receiver?

    Any one knows how to get an OFDM/Offset QAM modulator and demodulator with matlab?
  2. P

    how to plot a colorful constellation

    Dear all, How can I plot a qam constellation like attached figures. thanks
  3. P

    optical ofdm using matlab code needed

    I also want. any one has code for 10gbps 16QAM ofdm with 512fft?
  4. P

    How to extract X-Parameters in lab without NVNA?

    anyone knows how to extract the X-Parameters in lab without NVNA equipment? especially for S-type and T-type X-Parameter, I have no idea right now.
  5. P

    how to normalize power spectral density

    hi I want to compare distortions of two signals. I calculated the power spectral density of these signals. anyone can tell me how to calculate the normalized power spectral density, so I compare these two spectral? it is better if you can write matlab code. Thanks in advance
  6. P

    how to correct Phase shift at ofdm demodulation

    I think it should be like post-processing for measurement data. but I don't know how to do. please help me out!
  7. P

    how to correct Phase shift at ofdm demodulation

    I generated OFDM signal and upconverted to 900MHz. I used this signal to drive laser, and received signal from photodetector. In post-processing, I demodulated received signal without any correction. the constellation is like fig.1. how can I correct this phase shift?
  8. P

    can anybody give me the schematics of ALC and AGC in CATV?

    Re: can anybody give me the schematics of ALC and AGC in CAT anybody can offer a circuit?
  9. P

    What is the relationship of the microtrip's width?

    In AppCAD software, why don't the Z0 change when i only change the frequency?
  10. P

    What is the relationship of the microtrip's width?

    Thanks all. I have a software as the attached. Can I get a exact width by using this software? but it don't come down to the gap.
  11. P

    can anybody give me the schematics of ALC and AGC in CATV?

    Re: can anybody give me the schematics of ALC and AGC in CAT I think those circuit can't be used in RF amplifiers(40MHz~870MHz).
  12. P

    can anybody give me the schematics of ALC and AGC in CATV?

    can anybody give me the schematics of ALC and AGC in amplifiers for the CATV systems?
  13. P

    What is the relationship of the microtrip's width?

    In CATV system, to get the impedance of 75 ohm, what are the microtrip's width and spacing to ground on the same surface? How to calculate them?
  14. P

    What is the relationship of the microtrip's width?

    What is the relationship of the microtrip's width to the spacing to ground? The bottom of PCB is copper.
  15. P

    Were can I find the modul of HSMP3814 to simulate it in ADS?

    Were can I find the modul of HSMP3814 to simulate it in ADS?
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