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Adaptive multi-channel equalisation is investigated for HF STANAG 4285 transmissions by processing data collected during March-April 2000. The demodulation performance of a conventional multi-channel receiver is compared to that of a bespoke multiple steered-beam method, in interference scenarios in which a single-channel receiver could not acquire, or had difficulty in acquiring, a signal. It is shown that the multiple beam architecture can adapt using a short training sequence whilst maintaining excellent demodulation performance. Multi-channel processing for HF STANAG 4285 is shown to provide a reduction in probability of bit error of two orders of magnitude or more over a COTS modem.
Date of Conference: 23-26 June 2003