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Wideband wireless QPSK

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Joe Ten

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Hi All,

We are building the following system:

* S-band (2.3 GHz), wireless communication for video transmission
* Modulation: QPSK
* Raised cosine filter, roll-off 0.4
* Banpass bandwidth: 4MHz aprox.
* Net Bit Rate: 4 MBps
* FEC: Viterbi
* CMA Equalisation

Video transmission is not working, probably due to fading. Any idea? Is it possible to make this QPSK wireless signal working, or is it a failed design?

Thanks for helping. Best,
Joe
 

Try connecting the two radios with coaxial cable and variable attenuator. You should have an estimate of the Rx sensitivity, see how close you can get to that over cable. If that is close to what you expect, then you can rule out the radio and digital processing, and the problem is either the antenna, or something over the air.
 

I guess its wrong desing because symbol rate is very high - symbol duration is low and inter-symbol interference deny your reception (result of multipath). You should implement OFDM
 
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