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From: | Martin Braun |
Subject: | Re: [Discuss-gnuradio] tx_ofdm and rx_ofdm |
Date: | Mon, 26 May 2014 14:40:08 +0200 |
User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.5.0 |
On 26.05.2014 13:03, xianda wrote:
Hi: Now I run the example(tx_ofdm and rx_ofdm) through two usrps.(The version of my gnuradio is 3.7.4). 1.But in the receive part I receive two many things like this: INFO: Detected an invalid packet at item 139632 INFO: Parser returned #f
Xianda,this questions pops up a lot on this list, and 99% of the time it means your RF settings are distorting your signal. Try reducing gain and multiplier, and make sure you get a nice spectrum before you try and receive (i.e. check it with uhd_fft and make sure it's rectangular).
UHD Warning: The hardware does not support the requested TX sample rate: Target sample rate: 0.100000 MSps Actual sample rate: 0.195312 MSps And the device I use is USRP N210.And I set the sample rate is 100k. Some days ago,someone tell me set the sample rate 100M/even number.And the 100k seems right,why this UHD warning?Can someone tell me what is the appropriate sample rate for USRP N210?Thank you very much.
If you want 100K, you need to resample on the host. A stock N210 can go down to 100e6/512 (i.e. what you're seeing). But that's OK, resampling from 200k to 100k is not too CPU-intensive if you have a decent hardware.
M
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