• Capacity of Noncoherent MFSK Channels

      Bar-David,I.; Butman, S. A.; Klass, M. J.; Levitt, B. K.; Lyon, R. F.; Jet Propulsion Laboratory (International Foundation for Telemetering, 1974-10)
      This article computes the capacity of a noncoherent multifrequency-shift-keying channel as a function of the number of orthogonal signals, M, and the predetection signal-to-noise ratio, ST/N₀, for three basic receiver types; these are hard decision, unquantized (optimum), and quantized (soft decision). Computational cutoff rates for sequential decoding are also computed.
    • The Laser Absorption Spectrometer: A New Remote Sensing Instrument for Atmospheric Pollution Monitoring

      Shumate, M. S.; Jet Propulsion Laboratory (International Foundation for Telemetering, 1974-10)
      An instrument capable of remotely monitoring trace atmospheric constituents is described. The instrument, called a Laser Absorption Spectrometer, can be operated from an aircraft or spacecraft to measure the concentration of selected gases in three dimensions. This device will be particularly useful for rapid determination of pollutant levels in urban areas.
    • A Model for Sequential Decoding Overflow Due to a Noisy Carrier Reference

      Layland, James W.; Jet Propulsion Laboratory (International Foundation for Telemetering, 1974-10)
      An approximate analysis of the effect of a noisy carrier reference on the performance of sequential decoding is presented. The analysis uses previously developed techniques for analyzing noisy reference performance for medium-rate uncoded communications adapted to sequential decoding for data rates of 8 to 2048 bits/s. In estimating the 10⁻⁴ deletion probability thresholds for Helios, the model agrees with experimental data to within the experimental tolerances.