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Re: [Discuss-gnuradio] Very low packet loss rate for the discontinuous B

From: Alex Zhang
Subject: Re: [Discuss-gnuradio] Very low packet loss rate for the discontinuous BPSK communications- the analysis and looking for solution
Date: Fri, 1 Mar 2013 15:55:35 -0600

Seems no one can shed a light on this topic?

On Thu, Feb 28, 2013 at 10:25 PM, Alex Zhang <address@hidden> wrote:

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.


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