Embedding communications into radar emissions by transmit waveform diversity

Embedding communications into radar emissions by transmit waveform diversity

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The challenge posed by the ever-increasing RF spectrum demand for communication applications is in part met with radar and communication spectrum sharing by codesign of dual-function systems. Co-design of joint radar/communication systems requires the use of some form of waveform diversity via exploitation of the available time, frequency, coding, spatial, or polarization degrees-of-freedom. In this chapter, we have focused on methods for coding, spatial, and spectral forms of waveform diversity, presenting particular dual-function design strategies for each along with practical implementation issues.

Chapter Contents:

  • 23.1 Coding waveform diversity
  • 23.1.1 PCFM-based radar-embedded communication (REC)
  • System model
  • Spectral content
  • 23.1.2 Receive filter design to address RSM for coding diversity REC
  • Common filter response
  • Matched filter (MF) formulation
  • Mismatched filter (MMF) formulation
  • Cascaded filters formulation
  • 23.1.3 Characterization of RSM
  • 23.2 Spatial waveform diversity
  • 23.2.1 Far-field radiated emission design
  • Signal model
  • Optimality of waveforms
  • Utilization of the null space and the total directed power
  • 23.2.2 Realization of emission constraints using error reduction algorithm
  • FFRED implementation
  • 23.2.3 Simulated characterization of FFRED emissions
  • 23.3 Spectral waveform diversity
  • 23.3.1 Designing an FM noise waveform with spectral notches
  • 23.3.2 Embedding communications into radar spectral notches
  • 23.3.3 Performance assessment of THoRaCs
  • Performance evaluation
  • 23.3.4 Commensal radar with spectrally shaped OFDM
  • 23.4 Conclusions
  • 23.5 Looking ahead
  • References

Inspec keywords: diversity reception; network coding; radio spectrum management; radar transmitters

Other keywords: transmit waveform diversity; communication applications; polarization degrees-of-freedom; waveform diversity; communication spectrum sharing; RF spectrum demand; dual-function design strategies; embedding communications; joint radar/communication systems co-design; radar emissions

Subjects: Codes; Radar equipment, systems and applications; Radio links and equipment

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