[Discuss-gnuradio] 4-bit quantization and rounding

[eenrti]

Hello
I have built a lower-bit quantization scheme in the rx_bufffer.v using 
4-bit samples, storing one byte for each clock sample (for both I and Q) 
and then filling up the 16-bit FIFO with another 8 bit value coming from 
the next clock sample.

Whan I did some tests and plotted the results everything looked fine, 
like frequency and sahpe of the waveform, I could see though some spikes 
equal to a value of 1. This is coming from the rounding effect which I 
have not removed. When I do remove that then the spikes become more (in 
population not in amplitude) and then I had a look and I saw in the list 
that there is a DC offset that causes that?

Can anyone advice me how to get rid of these spikes?

Thank you
Rigas