You're right, I was normalizing for the purposes of plotting. Here's what the raw complex samples look like: http://img490.imageshack.us/img490/3225/rawbasebandvv9.jpg +/- 2400 or so. and here's that other plot regenerated: http://img249.imageshack.us/img249/9520/d256unnormalizedkd4.jpg
signal is going in to RX at -10dBm, default gain setting. On 3/14/07, Eric Blossom <[EMAIL PROTECTED]> wrote:
On Wed, Mar 14, 2007 at 09:47:20PM -0400, Steven Clark wrote: > Plots of USRP decimation woes: > input is GMSK waveform @ ~30ksym/sec, BT = 0.35, no noise added > using decimation rate of 16: > http://img339.imageshack.us/img339/4467/d16cz9.jpg > top plot is complex baseband, bottom plot is amplitude of top plot > some amplitude variations noticeable, but fairly minor. > > using decimation rate of 256: > http://img256.imageshack.us/img256/2850/d256qh2.jpg > heavy amplitude variations. > zoomed in version of previous plots: > http://img490.imageshack.us/img490/6528/d256zoomedku7.jpg > > Still confused as to what is going on here... Steve, what's the real amplitude of the received baseband signal? I suspect that you are normalizing to 1. Can you regenerate the plots without normalizing so that we've got an idea of the values coming across the USB. Eric
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