RU2619722C1 - Repeater - Google Patents

Abstract

FIELD: radio engineering, communication.

SUBSTANCE: repeater contains: a receiving antenna, a high frequency amplifier, the first and the second frequency converters, the first and the second intermediate frequency amplifiers, a power amplifier, a transmit antenna, the first and the second local oscillators, the first electronic switch and two quartz resonators. A clock generator, (n-2) quartz resonators, the second electronic switch, a calculator with an input for external recording, (n-1) first frequency converters, (n-1) second frequency converters, (n-1) first heterodynes, (n-1) second heterodynes, and (n-1) first intermediate frequency amplifiers are introduced.

EFFECT: increasing the repeater functionality due to the increasing the number of subscribers and the provision of a multichannel adaptive mode of the repeater operation.

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Description

The invention relates to radio engineering, and in particular to discrete message transponders.

Known repeater, consisting of a transceiver antenna, antenna switch, receive path, delay line, transmit path [1].

Due to the organization of only one channel, the repeater does not provide an increasing number of radio links.

Known active repeater, taken as a prototype, containing a receiving antenna, high-frequency amplifier, first frequency converter, delay line to τ [2]. The quantity τ satisfies the condition τ = 1 / 2f, where f> 2ΔF, and ΔF is the band of the information signal. The repeater also includes a second frequency converter, a power amplifier, a transmitting antenna, a first local oscillator, the output of which is connected to the second input of the first frequency converter, a control signal generator with a frequency f, an electronic switch, and quartz resonators. The output of the second local oscillator is connected to the second input of the second frequency converter, and the input to the second output of the electronic switch, the first output of which is connected to the input of the first local oscillator. The first and second inputs of the electronic switch are connected to the first and second quartz resonators, and its control input is connected to the output of the control signal generator.

The disadvantages of the prototype include:

organized only two relay channels;

during transmission, due to a powerful other transmitted signal, the high-frequency amplifier may be completely blocked and signal reception will cease;

a delay line at an intermediate frequency, for example an ultrasonic delay line, is a technologically complex and expensive device;

The aim of the invention is to expand the functionality of the repeater by increasing the number of subscribers and providing a multi-channel adaptive mode of operation of the repeater.

This is achieved by the fact that in the repeater containing the receiving antenna in series, a high-frequency amplifier, a first frequency converter, a first intermediate frequency amplifier, as well as a second intermediate frequency amplifier, a second frequency converter, a power amplifier, a transmitting antenna, a first local oscillator, an output which is connected to the second input of the first frequency converter, and the input to the first output of the first electronic switch, the first electronic switch, the first and W The inputs of which are connected to quartz resonators, the second local oscillator, the output of which is connected to the second input of the second frequency converter, and the input to the second output of the first electronic switch, a clock pulse generator, (n-2) quartz resonators connected to the corresponding inputs of the first electronic switch, (n-1) first frequency converters, (n-1) first local oscillators, (n-1) first intermediate frequency amplifiers, (n-1) second frequency converters, (n-1) second local oscillators, second electronic switch, a computer with an input for external recording connected by two-way communication with the first and second electronic switches, n first local oscillators, n first amplifiers of intermediate frequency, the input of the computer with an input for external recording connected to the output of the clock generator, (n-1) first outputs of the first electronic the switch through (n-1) of the first local oscillators are connected to the corresponding inputs of (n-1) of the first frequency converters, (n-1) of the second outputs of the first electronic switch through (n-1) of the second local oscillators are connected to the corresponding the corresponding inputs of the (n-1) second frequency converters, the output of the second intermediate frequency amplifier through the (n-1) second frequency converters is additionally connected to the corresponding inputs of the power amplifier, the output of the second electronic switch is connected to the input of the power amplifier, n wearable (mobile) radio stations via the radio through the repeater is connected to n stationary (mobile) radio stations.

Comparative analysis with the prototype shows that the proposed device is characterized by the presence of new units: a second electronic switch, a computer, a clock generator and their connections with other elements of the circuit. Thus, it meets the criteria of the invention of "novelty."

A comparison of the claimed solution with other technical solutions shows that the introduced nodes are widely known (A. Keystovich, Types of radio access in mobile communication systems. Textbook for universities / A. V. Keistovich, V. Milov. - M.: Hot line . - Telecom, 2015 .-- 278 p.).

However, when they are introduced in this connection with the rest of the circuit elements into the proposed device for expanding the functionality, new properties appear, which leads to the ability to simultaneously relay more than two modulated carrier frequencies and to ensure data exchange between subscribers spaced horizontally. This allows us to conclude that the technical solution meets the criterion of "significant differences".

In FIG. 1 shows a structural diagram of a repeater.

Repeater 22 consists of a receiving antenna 1, a transmitting antenna 2, a high-frequency amplifier 3, n first frequency converters 4, n first intermediate frequency amplifiers 5, a second electronic switch 6, a second intermediate frequency amplifier 7, n second frequency converters 8, a power amplifier 9 , n of the first local oscillators 10, the computer 11 with an input 21 for external recording, n of the second local oscillators 12, the first electronic switch 13, n quartz resonators 14 and 15, the clock generator 20. Repeater 22 provides reliable radio data exchange between n portable (mobile) radio stations 16 and 17 and n stationary (mobile) radio stations 18 and 19 spaced over the horizon (beyond line of sight).

The relay 22 operates as follows. High-frequency signals, for example, with amplitude or frequency modulation without coding, emitted by wearable radio stations 16, 17, induce an EMF in the receiving antenna 1, which, after the high-frequency amplifier 3, is fed to the n first converters 4, to the second input of which are allocated for communication frequency n of the first local oscillators 10, formed using n quartz resonators 14 and 15 with electronic circuits. This ensures the reception of radio signals from all n wearable (mobile) radio stations 16 and 17 and n stationary (mobile) radio stations 18 and 19 (n> 2). The method of time division of channels is used for relaying radio signals at the receiving frequencies: the entire time interval is divided into frames, and the frame into n slots into which the radio signals of the corresponding operating frequency are determined, determined by the corresponding quartz resonators 14 and 15, nodes 13, 12, 8 and control the signals of the calculator 11 with the input 21 for external recording coming to the first electronic switch 13. The frame duration is selected less than half the duration of the transmitted message, therefore, for the duration l at least two samples will arrive at one message, which, in accordance with the Kotelnikov theorem [3], will completely restore the transmitted message. The number n is determined, for example, by the number of pairs of radio stations 16, 17 and 18, 19 exchanging messages with each other, the requirements for ensuring a given reliability of transmission and (or) communication range [4]. Similarly, the transmission of messages from radio stations 18, 19 to radio stations 16, 17 through a relay is organized.

A computer 11 with an input 21 for external recording, built, for example, on a standard PC with additional modules for signal processing, provides the following operations:

the formation of frames and slots in them using highly stable marks of the generator of 20 clock pulses;

analysis of the presence of radio signals carrying messages in each of the n channels, for example, converting intermediate-frequency radio signals to digital using an ADC, as is done by SDR technology [4] and comparing them with a given threshold;

adaptation of the work, which consists in the fact that the number of slots in the frame in which information is transferred and the number of frequencies supplied from the second n outputs of the first electronic switch 13 through the corresponding second local oscillators 12 to the second frequency converters 8 depends on the presence of the corresponding radio signals at the input of the relay that provides a reduction in the power consumed by the amplifier 9 and the electromagnetic environment on the repeater with a small number of input radio signals;

management of electronic switches 6 and 13;

blocking paths passing through nodes 4 and 5 for the duration of transmission in the slots of radio signals having the same frequencies as received;

 enter the communication plan (nominal frequencies, number of subscribers, hours of operation, the requirement for the reliability of information transfer and others) at input 21, for example, using flash memory.

Dividing the transmitted radio signals into slots will reduce their average power of the received radio signals, but it can be compensated with the help of a power amplifier 9 or directional radiation by the transmitting antenna 2 in the direction of the corresponding radio stations.

The restoration of the transmitted radio signals is carried out in the receiving devices of the radio stations 16-19, since they have a broadband part of the radio frequency path, and their frequency band of the low frequency path is optimally matched with the spectrum of the signals generated for transmission.

The proposed repeater in comparison with the prototype has wider functionality, provides data exchange between several (more than two) subscribers spaced over the horizon without changing the frequency ratings in the radio channels.

Literature

1. USSR author's certificate N 1589410, M. cl. H 04B 7/15, 1988.

2. RF patent No. 2042272, M. cl. H04B 7/15, 1995 (prototype).

3. Fink L. M. Theory of transmission of discrete messages / L.M. Fink. - M .: Soviet Radio, 1970 .-- 727 p.

4. Keystovich A.V. Radio communication systems and equipment in aviation: textbook. allowance / A.V. Keystovich, A.V. Komyakov - Nizhny Novgorod: NSTU, 2012 .-- 236 p.

5. Keystovich A.V. Types of radio access in mobile communication systems. Textbook for universities / A.V. Keystovich, V.R. Milov - M .: Hot line - Telecom, 2015 .-- 278 p.

Claims (1)

A repeater comprising a series-connected receiving antenna, a high-frequency amplifier, a first frequency converter, a first intermediate frequency amplifier, and also a second intermediate frequency amplifier, a second frequency converter, a power amplifier, a transmitting antenna, a first local oscillator, the output of which is connected to the second input of the first frequency converter, and the input with the first output of the first electronic switch, the first electronic switch, the first and second inputs of which are connected They are equipped with quartz resonators, a second local oscillator, the output of which is connected to the second input of the second frequency converter, and the input is connected to the second output of the first electronic switch, characterized in that a clock generator, (n-2) quartz resonators are connected to the corresponding the inputs of the first electronic switch, (n-1) first frequency converters, (n-1) first local oscillators, (n-1) first intermediate frequency amplifiers, (n-1) second frequency converters, (n-1) second local oscillators, second electronic switch p, a computer with an input for external recording, connected by two-way communications with the first and second electronic switches, n first local oscillators, n first amplifiers of intermediate frequency, the input of the computer with an input for external recording connected to the output of the clock generator, (n-1) first outputs the first electronic switch through (n-1) first local oscillators are connected to the corresponding inputs of (n-1) first frequency converters, (n-1) second outputs of the first electronic switch through (n-1) second local oscillators are connected to corresponding inputs (n-1) of the second frequency converters, the output of the second intermediate frequency amplifier through (n-1) second frequency converters is additionally connected to the corresponding inputs of the power amplifier, the output of the second electronic switch is connected to the input of the power amplifier, n wearable (mobile) radio stations via radio through a repeater connected to n radio stations.

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