The system of transmission of data with multi-frequency modulation and optimal finite signals that do not cause inter-symbolic interference in the communication channel is investigated. A new structure of the optimal coherent modem has been developed for each individual channel of the system. In order to improve the spectral efficiency of the system, a three-stage model of orthogonization of canal signals has been introduced. To improve the energy efficiency of the system in channel modems implemented the method of space-time coding on Alamouty. Analysis of the spectral-energy efficiency of the system shows the advantage of the new scheme of organization of channel modems compared to known modern modems.
data transmission system, multifrequency modulation, coherent modem, optimal finite signals without inter-symbolic interference, spectral-energy efficiency
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