| 摘要 |
FIELD: radio engineering, communication.SUBSTANCE: method of multifrequency modulation of radio signal is characterized by that simultaneously several carrier frequencies the numbers of which during each clock interval are selected from a set N, and each of the carrier frequencies during a clock interval in addition is modulated by phase, amplitude, or width modulation, or their combinations, the grid of N frequencies is created in which the step of grid of frequencies is reduced in comparison with the step necessary for satisfaction of the condition of orthogonality, in integer times, the numbers of the carrier frequencies transmitted during the step are determined for the grid of frequencies with the reduced step, and in case of non-satisfaction in a specific clock interval of conditions of orthogonality the carrier frequencies during transmission are shift to required number of steps of the grid of frequencies with the step reduced towards the necessary side for coincidence with grid points where the orthogonality of signals is provided.EFFECT: decrease of band of the occupied frequencies at increase of the ratio signal-noise and increase of noise resistance.2 dwg, 1 tbl |
