The biasing effect of random bit errors on binary telemetry data.
Bias due to random bit errors that occur in PCM DATA during phases of operation of telemetry data processing system
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Bias due to random bit errors that occur in PCM DATA during phases of operation of telemetry data processing system
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Absolute value type early-late gate bit synchronizer steady state phase noise performance evaluation by Fokker-Planck method
The results achieved toward developing a baseline communications channel model for studying low bit rate telemetry transmissions from Venus Planetary Explorer spacecraft are presented. The overall communications systems model, discrete channel model, input signal generation, and signal acquisition model are discussed. Discrete Fourier transform considerations, sampling routines, and flow charts are included.
Description of an on-line optimal (in the sense of linear minimum mean square error) sequential bit synchronizer assuming minimal a priori knowledge of the incoming data. The adaptive synchronization algorithms, implemented on a small computer, are capable of accurately estimating pulse transition time, pulse amplitude, and pulse width by invoking the powerful Gauss-Markov theorem. Numerous simulations indicate that the performance of the synchronizer is satisfactory from the point of view of the amount of data required and the speed of convergence.