Changes between Version 42 and Version 43 of Other/Summer/2015/aSDR2
- Timestamp:
- Jun 22, 2015, 3:24:34 PM (9 years ago)
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Other/Summer/2015/aSDR2
v42 v43 80 80 81 81 ==== Signal Transmission and Processing with USRP2 and wiserd ==== 82 83 82 84 In this experiment we modify the [[http://www.orbit-lab.org/wiki/Tutorials/k0SDR/Tutorial05#SpectrumsensingwithUSRP2andwiserdOEDLandOML|Spectrum sensing with USRP2 and wiserd (OEDL and OML)]] tutorial. 83 85 [[BR]][[BR]] 84 We increase the sampling rate to 10 MHz, so we can accurately receive frequencies up to 5 MHz greater or lesser than the receiver's carrier frequency. We then randomly select frequencies from 796 to 804 MHz to transmit for one second each. 86 The tutorial uses two USRPs: one transmitter and one receiver. The transmitter starts at 798 MHz and increases to 802 MHz over a span of 5 seconds. The receiver has a carrier frequency of 800 MHz and bandwidth of 5 MHz. 87 [[BR]][[BR]] 88 As our first experiment we modified the tutorial. We increase the sampling rate to 10 MHz, so we can accurately receive frequencies up to 5 MHz greater or lesser than the receiver's carrier frequency. We then randomly select frequencies from 796 to 804 MHz to transmit for one second each. 85 89 [[BR]][[BR]] 86 90 Using OML, we save the receiver readings to a file for processing in MATLAB/Octave. Using a MATLAB script, we generate a waterfall plot of the data, along with an animated power vs. frequency plot. 87 91 92 {{{#!html 93 94 <center> 95 <table width=70%> 96 <tr> 97 <td><img src="http://www.orbit-lab.org/raw-attachment/wiki/Other/Summer/2015/aSDR2/exp1_1.2.png" align="middle" height=300> 98 <td><img src="http://www.orbit-lab.org/raw-attachment/wiki/Other/Summer/2015/aSDR2/exp1_2.gif" align="middle" height=300> 99 </tr> 100 </table> 101 </center> 102 103 }}} 88 104 89 105 106
