• ON THE DESIGN OF A SQUARE-ROOT NYQUIST PULSE SHAPING FILTER FOR AERONAUTICAL TELEMETRY

      Rice, Michael; Josephson, Chad; Brigham Young University, Department of Electrical and Computer Engineering (International Foundation for Telemetering, 2017-10)
      Bandwidth efficient linear modulations require a pulse shape with finite support in the time domain while simultaneously achieving good spectral containment in the frequency domain. The square-root Nyquist pulse achieves zero intersymbol interference (ISI) at its matched-filter output but does so with infinite support in the time domain. This paper investigates three different methods for generating an FIR approximation of a square-root Nyquist pulse.
    • OPTIMIZING CODED 16-APSK FOR AERONAUTICAL MOBILE TELEMETRY

      Rice, Michael; Josephson, Chad; Perrins, Erik; BYU, Dept Elec & Comp Eng; Univ Kansas, Dept Elec Eng & Comp Sci (International Foundation for Telemetering, 2017-10)
      This paper investigates the application of 16-APSK modulation to aeronautical mobile telemetry. The peak-to-average power ratio vs. code rate tradeoff is mapped to an optimization problem involving spectral efficiency and the constellation parameters. The optimization results produce a theoretically optimum solution that is 3.95 times more spectrally efficient as uncoded SOQPSK-TG. When implementation losses and the available IRIG 106 LDPC code rates are factored in, the advantage drops to 3.20 times the spectral efficiency of SOQPSK-TG.