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From: | Arun Pillai |
Subject: | [Discuss-gnuradio] weird interaction between start of burst and oscillator phase |
Date: | Tue, 26 Oct 2010 02:20:59 -0400 |
User-agent: | Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.11) Gecko/20101006 Thunderbird/3.1.5 |
Hi folks,I am seeing a very bizarre problem. I am using the USRP2 to transmit a stream of packets interleaved with silence. Each USRP packet obviously spans multiple Ethernet packets. When I send each USRP packet as part of its own burst (i.e. start of burst = 1 on the first ethernet packet corresponding to a USRP packet, end of burst = 1 on the last ethernet packet corresponding to that USRP packet, immediate = 1 on all packets, and repeated for each USRP packet), the channel that I see at the receiver for each packet has a very different phase even after accounting for CFO. However, if I send all the USRP packets along with complex zeros for intervening silence as one burst, I see that the channel phase is as expected i.e. the change in channel phase from packet to packet corresponds to exactly the CFO.
Any idea why this could be happening? Thanks, Arun.
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