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From: | Dave NotTelling |
Subject: | Re: [Discuss-gnuradio] Transmit and Receive hopping Sequence in FHSS (using gr-spread module) mismtach |
Date: | Fri, 26 Aug 2016 12:32:13 -0400 |
HI All,I am using gr-spread module to transmit a signal using FHSS. When I receive the FHSS signal, the received signal has a completely different hopping sequence as from the transmitted one. I am using USRP N210 for transmission and reception. I am not sure why this is happening. The transmitted sequence is (frequencies in Khz)187.5-12.5162.5-62.562.5137.5-112.5-37.5112.5-162.5-137.5-87.512.537.587.5and the received sequence is37.562.5112.5-187.512.5187.5-37.587.5162.5-87.50137.5-137.5-112.5-62.537.562.5I have created a movie out of the images which plots the IQ, FFT and WaterFall plot for the transmitted signal and the received signal using the "plot_psd_base.py" file in gr-utils. Please have a look at both of them here and here.Please see the attached files for the flowgraphs, I am using as the transmitter and receiver.I have stored the received and transmitted signal to a file. Since these are large files I have uploaded them to google drive here.Could someone please help me understand the behavior I am observing ?Is this some sort of synchronization issue ? What am I missing ?Thanks in advance.ᐧ
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