On 08/08/2013 05:25 PM, Alex Zhang wrote:
Hi,
I am transmitting a series of BPSK burst signal and try to observe the
phase distortion for the BPSK signal on air. But it is found that the
Phases of different BPSK bursts are different.
I think this change is caused by the fact that the ADC clock phases
are different for the starts of every signal burst. But I don't know
more details on this mechanism.
BR,
Indeed, the carrier phase for discontinous transmission will be at some
random spot every time you start a burst. The hardware doesn't have any
notion of "start the burst only when the clock phase is the same as
it was last-time I sent a burst". Unless you have utter blind luck,
your burst timing
isn't ever going to be an exact multiple of the clock frequency, so
there's no way the carrier phase will be in exactly the same place at
the start of
every burst.
--
Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org
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