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Re: [Discuss-gnuradio] OFDM Transmitter and Receiver - poor synchronizat

From: Martin Braun
Subject: Re: [Discuss-gnuradio] OFDM Transmitter and Receiver - poor synchronization with USRP1
Date: Sat, 09 May 2015 14:25:13 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.6.0

Is the detection working reliably?


On 09.05.2015 14:11, Michal Vaclík wrote:
> Hi,
> I am trying to implement OFDM transmitter and receiver (both in one
> flowgraph) using 2 USRP1s (both equipped with WBX). I have adjusted the
> signal so there's no peak above 1 and -1, but I am still failing at
> syncrhonization. I used exmaples mentioned in Martin Braun's talk at
> FOSDEM 14 which are now available in digital/ofdm/ folder.
> Running the flowgraph without USRPs seems to be fine at lower sample
> rates (~125k), but I am struggling at adjusting sample rates for USRP1
> which cannot go lower than 250k. I have noticed syncrhonization being
> much better at high sample rates (2-4M).
> Are there any guides on how to achieve better synchronization with two
> USRP1s?
> Thanks in advance.
> Michal
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