USRP (Universal Software Radio Peripheral) is an experimental platform of a GNU radio or software-defined radio (SDR) system where components that have been typically implemented in hardware
(e.g. mixers,filters,amplifiers,modulators/demodulators,detectors,etc.) are instead implemented by means of software on a personal computer or embedded computing devices[6].We use USRP boards and two daughter boards for the evaluation platform of low frequency operation via radio reconfiguration .The Basic TX and Basic RX boards are designed for use with external RF frontends operating from 1 to 250MHz frequency bands[5]. LFTX and LFRX are similar to the The Basic TX and Basic RX ,but operating frequency bands are from DC to 30MHz with differential amplifiers and low pass filters[5]. We verified the USRP system can work on the low frequency bands which are suitable for underground communications.Using two USRP mother boards equipped with Basic LFTX and LFRX daughter boards, the communications system working on low frequency bands are established as shown in Figure 4.We tested three candidates of low frequency bands such as 13.56 MHz ISM band, 6.78 MHz ISM band, and 190KHz LowFER band.In the experiments, one host PC (Linux OS) is sending data while another host PC is receiving the date.Instead of printing received data, the received can run spectrum analyzer to show the RF signal level. The receiver shows increased signal level when it is receiving data.
USRP (Universal Software Radio Peripheral) is an experimental platform of a GNU radio or software-defined radio (SDR) system where components that have been typically implemented in hardware(e.g. mixers,filters,amplifiers,modulators/demodulators,detectors,etc.) are instead implemented by means of software on a personal computer or embedded computing devices[6].We use USRP boards and two daughter boards for the evaluation platform of low frequency operation via radio reconfiguration .The Basic TX and Basic RX boards are designed for use with external RF frontends operating from 1 to 250MHz frequency bands[5]. LFTX and LFRX are similar to the The Basic TX and Basic RX ,but operating frequency bands are from DC to 30MHz with differential amplifiers and low pass filters[5]. We verified the USRP system can work on the low frequency bands which are suitable for underground communications.Using two USRP mother boards equipped with Basic LFTX and LFRX daughter boards, the communications system working on low frequency bands are established as shown in Figure 4.We tested three candidates of low frequency bands such as 13.56 MHz ISM band, 6.78 MHz ISM band, and 190KHz LowFER band.In the experiments, one host PC (Linux OS) is sending data while another host PC is receiving the date.Instead of printing received data, the received can run spectrum analyzer to show the RF signal level. The receiver shows increased signal level when it is receiving data.
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