Software-Defined Radio Interoperability with Frequency Hopping Waveforms

Open Access
Author:
Sunderland, Matthew D
Graduate Program:
Electrical Engineering
Degree:
Master of Science
Document Type:
Master Thesis
Date of Defense:
April 02, 2010
Committee Members:
  • Sven G Bilen, Thesis Advisor
Keywords:
  • Software-Defined Radio
  • SDR
  • Radio Interoperability
  • Radio Bridging
  • Frequency Hopping
  • GNU Radio
  • USRP2
Abstract:
The flexibility and reconfigurability offered by software-defined implementation of radio systems enables a new class of radio interoperability platforms. Such software-based “radio bridges” allow several heterogeneous communications networks to be joined simply by loading the correct waveform specification into memory. Particular demand for radio interoperability solutions exists to provide un- interrupted communication between the U.S. Armed Forces and first responders to emergencies. Moreover, due to the increased reliability provided by frequency- hopping systems, several military waveforms use such techniques. This work documents the development of a frequency-hopping radio bridge implemented using the GNU Radio/USRP2 platform. Specifically, a waveform similar to the specification for SINCGARS is used as a target modulation scheme. Software-defined implementation of frequency hopping waveforms is hindered by the additional timing requirements not present in other waveforms. To overcome this, the time-sensitive signal processing of frequency-hopping waveforms is implemented in a reconfigurable FPGA.