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ALE Frequency Selection for Navy Modems: Analysis
NAVAL OCEAN SYSTEMS CENTER SAN DIEGO CA
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The objective is to develop a simple model for HF 2-30 MHz modem performance as a function of various channel parameters, and to develop techniques for predicting those parameters. Modem performance was modeled based on three parameters-signal-to-noise ratio SNR, delay spread, and Doppler spread. Each of these parameters is measurable using known techniques. The model demonstrates the inadequacy of using only SNR and bit error-rate estimates for frequency selection in automatic link establishment ALE algorithms. The benefits from incorporating delay and Doppler spreads in the ALE frequency selection algorithm are sufficiently clear to justify extension of the algorithms to include these factors. Further research is required to verify the sufficiency of SNR, delay spread, and Doppler spread for frequency selection.
APPROVED FOR PUBLIC RELEASE