TY JOUR TI “Waveguide” Effect of Ultrawideband Signal Indoor Propagation KW ultrawideband KW signal propagation KW two-ray reflection model KW Vvedensky formula KW chaotic signal JO Infocommunications and Radio Technologies AU Andreyev, Y.V. AU Petrosyan, M.M. PY 2022 IS 5 PB Federal State Educational Institution of Higher Education Sevastopol State University