SU592017A1 - Method of frequency division multiplexing - Google Patents

Description

(54) METHOD OF FREQUENCY SEALING COMMUNICATION CHANNELS

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The invention relates to radio engineering, can be used in space communication systems.

The known method of frequency multiplexing of communication channels in a communication system with multiple access via a common repeater, at which a signal with frequency modulation r not overlapping on the high-frequency and low-frequency spectra with the corresponding HCUioB spectra of other stations is transmitted on the repeater, the signals of all stations they are combined into a common emitted signal, and the signal received after retransmission is demodulated at each station with the release of the corresponding part of the common signal rij.

However, Ms1La is iy-ligchina-admissible. Carrier-frequency frequency detuning and the presence of .combilation interference in mNost-and-indion mode. LySTuna Means Gelir. complicate.; yoves4ny. - method i

Purpose from €, р; éteny; - elimination of the “ombina- tion. And increase of tolerances. carrier oscillations.

To achieve this goal when using the method of frequency multiplexing of communication channels in a communication system with multiple access via a common repeater, in which at each station they transmit a signal with frequency modulation, do not overlap with the high-frequency and low-frequency spectra with the corresponding spectra of the other stations, the transponder signals of all stations are combined into a common emitted signal, and the signal received after retransmission is demodulated at each station, highlighting the corresponding part of the total signal, when retransmitting, the frequency-modulated station signals are combined into a common signal by pairwise multiplying the station signals.

FIG. Figure 1 shows a structural electrical circuit diagram of a device for combining frequency-modulated speakers. the proposed method; Fig. 14 is a time diagram explaining the paiSoi-y device. ; The device contains bandpass filters 1 g - 7, - frequency converters: .8.j :: -l-t).: - /

Claims (1)

: Ea§oTaet-: device as follows. . -At each of the four stations, for transmitting, a group frequency spectrum is formed that does not overlap with the group spectrum of other stations (Fig. 2, a - d) which are allocated by band-pass filters 1-4. Frequency modulated signals with carrier frequencies w ,, uij. () come from filters 1-4 to converters 8 and 9 (FIG. 2, d), which combine frequency-amplified signaling of two stations and transmit them to converter 10 through band-pass filters 5 and b, then at the output of the band-pass Filter 7 generates a combined frequency-modulated signal of four stations (Fig. 2e), which is radiated with a maximum ms rate for all stations. Each station receives a signal, demodulates it, and extracts the frequency-modulated signal addressed to it from the total group spectrum (FIG. 2, g). Such a method eliminates combinational interference and increases the permissible detuning of carrier frequencies (Oscillations. Claims of Invention Frequency multiplexing of communication channels in a communication system with multiple stations. From the second station From the third station From the fourth station Fig. Access through the common repeater, with where at each station a signal is transmitted from a frequency modulus of copier that does not overlap in the high-frequency and low-frequency spectra with the corresponding signal spectra of the other stations, on the repeater signal All stations are combined into a common radiated signal, and the signal received after retransmission is demodulated at each station, highlighting the corresponding part of the total signal, characterized in that, in order to eliminate combinational noise and increase the allowable detuning of the carrier frequency, retransmitting the combination of frequency modulated The station signals into the common signal are performed by pairwise multiplying the station signals pairwise multiplied together. Sources of information taken into account in the examination: 1. Fortushenko A.M. Fundamentals of technical design of communication systems through satellites, M., Sv, p. 216-236, 1970. sunparnog signal /////////// | u // U ////// 1 //, /////, 7 //) /// ,, 7 - // 7П7А Ш7 /// / 7 ////////, u,  ////////,7, //.i7//// 7K /, i //// ,, // i. / i / i / i / 77  / f7 /: 7 // 7J 0 / 1Ш /// / Ш / 77Щ. CO OJ, u). four fU FIG. g