Adaptive SDR-Equalizer for Frequency Dispersion Correction in Single-Mode Wideband HF Radio Channels

Research focused on the problem of developing digital adaptive equalizer in the frequency band of wideband HF communication to overcome the negative effect of nonlinear phase dispersion. Developed methods, algorithms and software are supported by the SDR technology and were implemented with the use of the USRP N210 platform. They use state-of-the-art approaches in digital signal processing, including those elaborated by the authors. Verification of methods, algorithms, and software for adaptive equalization was carried out in full-scale experiments on LFMCW sounding over the Cyprus-to-yoshkar-Ola propagation path of length of 2600 km. Besides, the specific objective of the research was studying equalization efficiency in megahertz-bandwidth channels the single-mode (1F mode) propagation band.