Seems no one can shed a light on this topic?
On Thu, Feb 28, 2013 at 10:25 PM, Alex Zhang <cingular.a...@gmail.com>wrote: > Hello, > > In the current gr-digital/narrowband, I am using the benchmark_tx.py and > rx.py to test the bpsk communications. > It is found that the packet loss rate is very high (70% loss) in > discontinuous mode where every 5 packets are in a burst. But in continuous > mode, the paket loss rate is less than 10% for the same point to point > link. > > I captured the waveform data. From the observed result, it seems that for > each burst (5 packet), the bpsk receiver needs to re-do the frequency/time > sync. This will directly causes that the first packet of each burst will > definitely be crashed. Also, some burst can not be demodulated correctly at > all. For the same reason, even in the continuous mode, the very first > packet is also crashed at the receiver. > > I have tried to add very long preamble for each packet to ensure the data > part of the packet can be received in well sync status. But the result is > not very good. > > Before I get further investigation on the solutions, just wondering if any > ideas or existing work within this community. > > -- > > Alex, > *Dreams can come true – just believe.* > -- Alex, *Dreams can come true – just believe.*
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