Alex,
If Adeel's solution is not meeting your burst transmission specs, you can try implementing some fast openloop synchro algorithms given in [1],[2]. You could look into some data aided schemes too, though I haven't tried those yet.
[1] Digital Communication Receivers, Heinrich Meyr, Section 8.2.2
[2] Two Frequency Estimation Schemes Operating Independently of Timing Information, Ferdinand Classen and Heinrich Meyr
---
Regards
Sreeraj Rajendran
http://home.iitb.ac.in/~rsreeraj
From: Adeel Anwar <address@hidden>
To: Alex Zhang <address@hidden>
Cc: address@hidden
Sent: Monday, 4 March 2013 5:51 PM
Subject: Re: [Discuss-gnuradio] Very low packet loss rate for the discontinuous BPSK communications- the analysis and looking for solution
Alex,
1: U can try adjusting the synchronization loops bandwidth (Phase/Timing etc) see PFB_Timing documentation
2: Try reducing the receiver gain (for a constant tx-amplitude/gain) or reduce transmission amplitude/gain (for constant rx gain)
-Adeel
On Sat, Mar 2, 2013 at 10:21 AM, Alex Zhang
<address@hidden> wrote:
I think you may rarely get the correct packet with pktno = 0, in continuous mode, as my guess. Your received correct packet starts from pktno = 1.
Could you also try the discontinuous mode for the BPSK communications?
My question is actually a problem that how to implement a more reliable BPSK mod/demod in burst mode. The current bpsk example in GNURadio does not work well in burst mode.
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