In my previous post the image at the top is "no output QAM.png" and the image below is " working QAM.png".
I stated that it "works" meaning that I have a bit stream at 2kbps being sampled into teh code via the Audio Source...and a complex output of QAM I & Q symbols output from the Audio Sink at 1kSYMbol/sec.
These rates are as viewed with an external oscilloscope.
In the interests of truly understanding how this code works I have a question about the code "workingQAM.png".
What perplexes me is shown below.... why is it that an Interpolation factor of 6 works in this case ?
Im keen to understand the reasoning behind these different sampling, display and output rates.
Thanks for any help.
On 5 June 2018 at 12:32, Carlo Manfredini <address@hidden> wrote:
Hi,I have had some success with a QAM implementation using the RR. Thanks for the suggestion. (see working QAM.png)However, now I wish to create constellations without filtering, so Im using the chunk to symbol mapping block which seems straight forward.But I now get no output from my Audio Sink....which works fine with other GRC code.Can you see anything which could cause an issue ? (see no outputQAM.png)i tried feeding the chunk block from a random source (0-4) to emulate the Pack K bits source...but it still did not outout.Thanks again.
