Frank, see some comments inline.
Achilleas > Hello sorry for the last message thought i attached my screenshot results at first. I am having some problems as to whether the information from the cdma transmission and reception are accurate. I have posted my screenshots for clarification hopefully. http://imageshack.com/a/img633/757/Yx8B7r.png The first screenshot is from executing the "cdma_txrx.grc" which seems to test well I believe because moving the sliders around and threshold I am able to notice when it performs tracking and acquisition of the signal automatically. A: I do not recall a "noise voltage" block in the cdma_txrx application. The SNR is controlled by the slider aptly called "EsN0dB". http://imageshack.com/a/img631/8451/CDqdTM.png The second screenshot is me loading two USRP's. This is the execution of the "cdma_tx.grc file with the UHD:USRP Sink and its WX GUI FFT Plot. My issue here is the FFT plot doesn't look right to. By the way the channel model for this is AWGN. A: You are saying "FFT plot doesn't look right". What is it that you expect to see and you don't ? Can you please elaborate on what does not look right about this? BTW, you don't need the cdma_tx to get this FFT plot: the cdma_txrx should give you exactly the same at the output of the tx. http://imageshack.com/a/img538/7792/1xXqN4.png After running the "cdma_tx.grc" file, I proceed to go to my other laptop and run the "cdma_rx.grc" file which is connected to that USRP(UHD USRP SOURCE. The image above is what I get. In the beginning it seems to be acquiring the packets then a few seconds later a lot of invalid packets get detected. Overall all are these images close to what I should be seeing. A: you have not told us anything about your system, so we cannot help you. For instance, what is your hardware setup (daughtercards, carrier frequency, sample rate, etc), what is the expected frequency error, what are the RX parameters that you have set? are they compatible with you working environment? is your laptop handling well the acquisition load (have you checked the load on your CPU cores?) Achilleas
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