Hi all, I just updated the examples in gr-digital/examples/ofdm using the feedback I got the last couple of weeks. They're in the current master, so if you want to check them out you probably need to git pull first.
Some notes on the examples: - ofdm_loopback.grc is probably where you want to start playing around. This gives you a configurable hier block for both transmitter and receiver. It uses a channel model block to simulate the channel, and you can play around with the SNR, frequency offset, channel coefficients to figure out how far you can take the transceiver chain before it can't cope. - rx_ofdm.grc and tx_ofdm.grc demonstrate the inner workings of the hier blocks. I've made them loopback examples too, now, so they immediately run stand-alone and you can see what's happening at all places in the flow graph without having to feed them file data etc. You can use these to connect tag debugs, scope sinks, FFT sinks, constellation sinks etc. at any place in the flow graph and thus find out how the OFDM blocks actually work. If you want to implement new equalizers, working off of rx_ofdm.grc is probably a good idea, because you can change the value of payload_equalizer to whatever you like. NOTE: If you want to change the *modulation type* of the payload (e.g. from QPSK to 8-PSK) you have to change it both in the transmitter *and* receiver, in any of these examples. Have fun, MB -- Karlsruhe Institute of Technology (KIT) Communications Engineering Lab (CEL) Dipl.-Ing. Martin Braun Research Associate Kaiserstraße 12 Building 05.01 76131 Karlsruhe Phone: +49 721 608-43790 Fax: +49 721 608-46071 www.cel.kit.edu KIT -- University of the State of Baden-Württemberg and National Laboratory of the Helmholtz Association
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