Signal-Code Constructs for Wideband HF Communication

The article deals with the tasks of developing new signal-code constructs for wideband low-speed decameter radio line. At present, the actual task is to expand the bandwidth of the signals used in the decameter range. One of the problems arising from this is the dispersion distortion of broadband signals in the ionospheric channel, which lead to a decrease in reception quality. Signal code constructions based on non-linear pseudorandom sequences and non-binary error-correcting code NB-LDPC code are proposed. In the role of nonlinear binary bandwidths, new sequences with a large ensemble are used. A system based on an advanced Kalman filter is proposed to compensate for dispersion distortion. The results of his work. The results of field tests of the new signal-code constructs are presented.