On Mon, Feb 27, 2012 at 10:00 AM, Ben Reynwar <
address@hidden> wrote:
> On Mon, Feb 27, 2012 at 7:36 AM, Jeff Hodges <
address@hidden> wrote:
>> Does anyone know if the QAM demodulator code is working properly? I would
>> like to get a QAM demodulator working for a symbol rate of 300ksym/s. I
>> don't know whether I am just using the wrong parameters or if the blocks do
>> not work properly, but I am not getting the results I expect.
>>
>> To test the code out I am using the GRC. I have a vector source with a known
>> data sequence running into the qam mod block and then the output of that
>> into a QAM demod block. The output of the QAM demod is running into a Uchar
>> to Float, and I am plotting the results on a WX GUI Scope. I have the exact
>> same settings on both the QAM mod and demod blocks. The output I am seeing
>> on the scope looks completely random. (I also tried other vector source
>> data: When the input is 0x0F, repeating, the output I see is 00001010
>> repeating. But when I use 0x0E, the results are random again.)
>>
>> I have also tried demodulating a real QAM signal with a known data sequence,
>> also to no avail.
>>
>> I have been working on this for about a month now and haven't had any
>> success. I have examined the underlying QAM.py and generic_mod,
>> generic_demod codes, and they seem to be written properly. But I am not
>> getting the expected results.
>>
>> Any help with this problem or advice you can give will be greatly
>> appreciated, and I will return the favor by helping out in any way that I
>> can.
>>
>> Thank you very much in advance,
>>
>> Jeff
>>
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>>
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>>
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>>
>
> If it's not working it's probably my fault, so I'll do some tests
> myself today and get back to you.
>
> Cheers,
> Ben