Data communication at rates near or above 2 kbits/s on 3 kHz-bandwidth HF radio channels is subject to impairment from severe linear dispersion, rapid channel time variation, and severe fading. In this investigation, recorded 2.4 kbit/s QPSK signals received from HF channels were processed to extract a time-varying estimate of the channel impulse response. From the estimated channel impulse responses, performance-related parameters were computed for ideal matched filter reception, maximum-likelihood sequence-estimation (MLSE), and decision feedback equalization (DFE). The results indicated that the simpler DFE receiver suffered only a small theoretical performance degradation relative to the more complex MLSE receiver. Other HF channel impulse response statistics were also obtained to shed light on equalization and filter adaptation techniques.

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Journal IEEE Transactions on Communications
Falconer, D.D, Sheikh, A.U.H., Eleftheriou, E., & Tobis, M. (1985). Comparison of DFE and MLSE Receiver Performance on HF Channels. IEEE Transactions on Communications, 33(5), 484–486. doi:10.1109/TCOM.1985.1096310