Abstract
Through-the-earth (TE) propagation subjects a radio signal to considerable attenuation. The uplink signal must, however, be detected in the presence of full-strength atmospheric noise. The author describes an integrated combination of adaptive noise cancellation (ANC), maximum-likelihood detection (MLD), nonlinear processing (NLP), and decision-aided feedback (DAFB) that can be used to combat atmospheric noise in through-the-earth-communication (TEC) systems. Tests with real VLF noise demonstrates improvements in the signal-to-noise ratio (SNR) from 10 to 24 dB. The increased SNR allows higher data rates, greater depth of operation, smaller transmitters, and/or smaller antennas. >
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