RU2617211C1 - Method of average multichannel zone network of bilateral mobile automatic radiocommunication with time-division mode of receiving and transmitting messages - Google Patents

Method of average multichannel zone network of bilateral mobile automatic radiocommunication with time-division mode of receiving and transmitting messages Download PDF

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RU2617211C1
RU2617211C1 RU2016107674A RU2016107674A RU2617211C1 RU 2617211 C1 RU2617211 C1 RU 2617211C1 RU 2016107674 A RU2016107674 A RU 2016107674A RU 2016107674 A RU2016107674 A RU 2016107674A RU 2617211 C1 RU2617211 C1 RU 2617211C1
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radio
communication
messages
time
transmission
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RU2016107674A
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Виталий Львович Хазан
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Федеральное государственное бюджетное образовательное учреждение высшего образования "Омский государственный технический университет"
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00Modulated-carrier systems
    • H04L27/18Phase-modulated carrier systems, i.e. using phase-shift keying includes continuous phase systems
    • H04L27/22Demodulator circuits; Receiver circuits

Abstract

FIELD: radio engineering, communication.
SUBSTANCE: method of medium wave zone network two-way radio with a time division modes of reception and transmission of messages is to provide a medium wave a multi-zone network two-way mobile automatic radio time division reception mode and transmitting messages, which makes it possible in the same limited bandwidth to simultaneously communicate discrete reports a large number of subscribers, which are removed from each other over long distances and use VEHICLAR compact and wearable antennas that do not require high-rise above the surface of the Earth during communication sessions at distances that do not satisfy the requirements of the line of sight between the antennas transmit and receive radio stations. Radios have a relatively low-power transmitters and sending messages from them by signals with an extremely low velocity in order to increase the noise immunity as the communication channels, and to accommodate the maximum number of users in the frequency band allocated for the radio network. The signals from the subscriber stations are transmitted simultaneously through parallel channels at frequencies satisfying the requirement to ensure mutual orthogonality of these signals. The invention relates to radio engineering and is designed for simultaneous recto mobile automatic radio large number of subscribers using the parallel frequency-spaced radio channel in general limited bandwidth (e.g., SSB telephone communication channel) for transmitting digital messages within the zone, the boundary of which can be far beyond the line of sight between the antenna and the radio base station antennas peripheral stations. The base station has a relatively high power transmitter which can transmit messages over long distances at high speed sealing operation time and using conventional methods of manipulation techniques such bi-phase shift keying or rocker. This radio network can be used by Ministry of Emergency Situations to monitor units potentially dangerous objects, warning and alarm transmission.
EFFECT: enhanced communication reliability.
8 dwg

Description

The invention relates to the field of radio engineering and is intended for simultaneous two-way mobile automatic radio communication of a large number of subscribers using parallel frequency-spaced radio channels in a common limited frequency band (for example, in the band of a single-band telephone communication channel) for transmitting discrete messages in a zone whose boundary may be far beyond the line of sight between the antenna of the base radio station and the antennas of the peripheral radio stations.

The proposed method for implementing a zone radio communication network determines the interaction algorithm of the base radio station with subscriber radio stations, as well as the types of modulation in the signals used for communication and message encoding methods from both the base and subscriber radio stations.

The technical result of the invention is to create a medium-wave multi-channel zone network of two-way mobile automatic radio communication with time division of the modes of receiving and transmitting messages, which makes it possible in the same limited frequency band to simultaneously exchange discrete messages to a large number of subscribers who are located at a considerable distance from each other and use small portable and portable antennas that do not require a high rise above the Earth’s surface when communication sessions over long distances that do not meet the requirements of direct visibility between the antennas of the transmitting and receiving radios.

Subscriber radio stations have relatively low-power transmitters and messages are transmitted on their part with extremely low speed signals in order to increase both the noise immunity of communication channels and to place the largest possible number of subscribers in the frequency band allocated for the operation of the radio communication network. Signals from the subscriber radio stations are transmitted simultaneously on parallel channels at frequencies that satisfy the requirement of ensuring mutual orthogonality of these signals.

The base station has a transmitter of relatively high power, which allows you to transmit messages over long distances with high speed in the time compression mode and using conventional manipulation methods, such as on-off or multiposition phase-shift keying methods.

VHF zonal communication systems, known as “trunking networks” [Kartashevsky VG, Semenov SN, Firstova TV, are widely known Mobile networks. - M .: Eco-Trends, 2001]. A big drawback of these VHF zonal communication systems is that the radio signal can propagate only within the direct line of sight between the antennas of the interacting radio stations, which takes place only at relatively short distances, which can hardly be increased by increasing the power of the transmitters of VHF radio stations. The distance L at which two-way radio communication is possible when using VHF communication systems is estimated by the well-known formula [Kalinin A.I., Cherenkova E.L. Radio wave propagation and radio link operation. - M.: From "COMMUNICATION", 1971 p. 31.] as a function of the height of the antennas h 1 and h 2 of the interacting radio stations:

Figure 00000001

For example, a base VHF radio station having an antenna raised to a height of 100 m can provide communication with a car whose antenna is located on its roof at a height of 2.5 m from the Earth, at a distance of only 41.34 km. In this case, the base VHF radio station with this kind of antenna cannot be mobile, but is stationary.

In the method for realizing a zone radio communication network that is proposed below, hectometer radio waves are used that are able to propagate over the horizon for many tens and hundreds of kilometers due to diffraction and without the need for highly elevated antennas. It is important to note that in the proposed embodiment of the construction of a zone communication network, a base radio station can, like subscriber radio stations, be mobile, located on any type of transport.

Known decameter active paging radio communication system with remote base repeaters, which is able to cover service areas with a radius of up to 1000 km or more [Khazan V.L. Decametric active paging radio system with remote base transponders // News of Higher Educational Institutions of Russia. Radioelectronics, 2005, No. 2, p. 53-59]. In this system, communication between subscribers is carried out through a decameter remote transmitter located outside the zone, which is stationary and located at a distance of about 2000-3000 km from the service zone, which corresponds to the most favorable single-hop radio path for decameter radio waves, which requires quite large material costs. Moreover, the movement of subscribers in space in the case of a limited number of basic repeaters can lead to an unpredictable exit of one of the subscribers from the zone served by the repeaters and the violation of the two-way radio mode for it. In addition, the direct and feedback channels in this system are spaced in frequency, which requires a doubled frequency resource to organize its work.

The proposed option for constructing a zone radio communication network has its own mobile base repeater, which makes it possible, if necessary, to move the entire serviced zone together with the base repeater in the desired direction, which is very important when conducting, for example, geological, geodetic expeditions and other various kinds of search operations. The modes of receiving and transmitting messages by basic repeaters and subscriber radio stations are spaced in time, which ensures electromagnetic compatibility of the receiving and transmitting devices located in close proximity to each other, with two-way radio communication at the same operating frequency. The transmission of messages from subscriber radio stations, taking into account the absence in the hectometer range of interference cluttered by the spectrum and selective fading during the propagation of a surface radio wave signal, makes it possible to use the amplitude-shift keying mode for transmitting discrete messages, which saves frequency resources twice as much as frequency-shift keying.

The prototype of the proposed zone communication network can be “The method of zone duplex communication with the time division of the transmission and reception channels” according to patent RU No. 2507683 of 02.20.2014, which is proposed to be used in various ranges, including short and medium radio waves. This method provides duplex communication on a single frequency for voice communication mode. The base and subscriber radio stations operate with constant periodic switching of the “receive” / “transmit” modes. Each of the subscriber radio stations in the communication mode is periodically switched from reception to transmission with a frequency while in the transmission time interval TPRD = T 1 in transmission mode and during the time interval TPRM = T 2 in reception mode, while the radio switching time period is T = T 1 + T 2 . The synchronization of both the calling and called subscriber radio stations with the base station repeater is provided in such a way that the transmission time interval of the subscriber radio station corresponds to the reception time interval of the base station and vice versa, so that the reception time interval of the subscriber radio station corresponds to the transmission time interval of the base station. To ensure this kind of duplex mode, before transmitting a message to a subscriber station, it is necessary to compress the voice message in time, and at the subscriber station receiving this message, restore the received message, i.e. its decompression and reproduction using the speaker. For comfortable communication of subscribers of the duplex network in voice mode with a temporary separation of the reception and transmission channels, a sufficiently high-speed switching of radio stations from the “receive” mode to the “transmit” mode and vice versa is required. Allowable message delivery delay may not exceed 0.5 s. Taking into account the implementation of the compression mode on the transmitting side of the radio line and decompression on the receiving side of the radio line, it is necessary to periodically switch radio stations from one mode to another every 0.2 s. At the same time, it is necessary that the switching process itself takes the shortest possible time. For each individual voice communication channel in this kind of system, its own working frequency is required. Therefore, this method cannot serve at the same time with a limited frequency resource a large number of subscribers.

The proposed method of the medium-wave zone network of two-way automatic radio communication with time division of reception and transmission channels is intended for simultaneous transmission of discrete messages from a large number of subscribers in a limited frequency band. Since the delay in information during the transmission of discrete messages is not a significant factor, switching radio stations can be done much less frequently compared to a telephone line, for example, with a frequency of 1 time per second or even less.

In FIG. 1 is a structural diagram of a medium-wave zone network providing two-way radio communication between a large number of subscribers.

In FIG. 2 shows a method of frequency multiplexing a communication channel using mutually orthogonal signals.

In FIG. Figure 3 shows the timing diagrams of the transmitted binary sequence, the corresponding code sequence using the absolute binary signal and the corresponding radio signal at the output of the transmitter.

In FIG. Figure 4 shows the time diagrams of the transmitted binary sequence, the corresponding code sequence using the time-position code and the corresponding radio signal at the output of the transmitter.

In FIG. 5 shows the time distribution of the functions of the signals transmitted by both the base relay radio station and the subscriber radio stations.

In FIG. 6 depicts a foot operator that conducts voice communication using a small-sized transceiver ferrite antenna.

In FIG. 7 shows a photograph of a car with a portable small-sized transceiver ferrite antenna, designed to work with a transmitter having a power of 100 watts.

In FIG. Figure 8 shows the results of route tests of small-sized transceiver ferrite antennas in the form of a dependence of the covered distance on the transmitter power when conducting both voice communication (solid line) and discrete messages (upper dashed line).

In order to ensure the highest possible noise immunity, the transmission speed from the subscriber radio stations selects the lowest possible, for example 4 baud, and the type of manipulation is amplitude manipulation using absolute bi-pulse signals (patent RU No. 2454015 of June 20, 2012) or signals with a time-frequency positional encoding (patent RU No. 2519011 dated 06/10/2014). This allows network subscribers, for example, to transmit messages simultaneously along 750 subchannels in one sideband of a telephone communication channel, using mutually orthogonal signals whose frequencies are spaced apart from each other by a multiple of Δf, the reciprocal of the Te message length, i.e. Δf = 1 / T e , as shown in FIG. 2. At the same time, the time intervals for transmitting messages from both the subscriber radio stations and the base relay radio stations are multiples of the duration of the message element T e .

Separate subchannels are permanently assigned to individual users, who in this case can freely and independently communicate with each other at any time.

A message is transmitted from the subscriber station, for example, using absolute bi-pulse signals, when the sequence “10” is formed when transmitting the “1” symbol, and the sequence “01” is formed when the “0” symbol is transmitted, as shown in FIG. 3, or, conversely, when transmitting the character “1”, the sequence “01” is formed, and when transmitting the character “0”, the sequence “10” is formed. It is possible to transmit a message using, for example, time-position coding, when each temporary position of the transmitted signal corresponds to a certain character, as shown in FIG. 4, or some other method. Obviously, from the point of view of saving power supply, the encoding option of the transmitted message corresponding to FIG. 4 is more preferable to the embodiment of FIG. 3. However, the coding option corresponding to FIG. 4, loses in noise immunity to the coding variant corresponding to FIG. 3, about 3 dB. Therefore, under favorable communication conditions, it is advisable to use a time-position code, and under adverse conditions, for example, for communications at extremely large distances, absolute bi-pulse signals should be used, providing higher noise immunity of message transmission.

From the side of the base radio station, which has two orders of magnitude higher power compared to subscriber radio stations, the message transmission rate in phase-shift mode (for example, according to patent RU No. 2391787 dated 06/10/2010) can be an appropriate number of times higher than the message transmission rate from peripheral radio stations without compromising the required reliability of message delivery, i.e. in case of using two-position / four-position phase manipulation 2400/4800 bit / s. If necessary, the time interval for transmitting a message from the base station T 2 can be selected as many times as necessary for the interval T 1 for transmitting a message from the subscriber radio stations. Thus, it is possible to balance the difference in message rates from both the subscriber radio stations and the base radio station, even in the case of 100% load of the radio line.

In FIG. Figure 5 shows the signal structures transmitted by both the base relay radio station and subscriber radio stations. Each message fragment corresponding to the “transmission” mode from the side of the base relay radio station starts with a command that synchronizes all processes in the zone network, i.e. determines the time when all subscriber radio stations switch to the “receive” / “transmission” mode and at the same time the beginning of the transmission of elementary packages by the subscriber radio stations (network clock synchronization), and also signals the start time of transmission of the next characters (network cycle synchronization). Subscriber radio stations begin transmitting messages with the “call” command, followed by the “called subscriber’s address” and “own address”, after which an informational message ending with the “end of message transmission” command is transmitted.

To ensure the mobility of the communication network, it uses small-sized ferrite antennas made, for example, according to patent RU No. 2413344 of 06/10/2010. FIG. 6 depicts a foot operator that conducts voice communication using such a small-sized transceiver ferrite antenna. The voice communication range on a real route with a transmitter power of 1 W is 20 km. When transmitting messages in telegraph mode, this distance increases many times. In FIG. Figure 7 shows a photograph of a car with a portable ferrite-receiver transceiver, which provides voice communication with a transmitter power of 100 W at a distance of 200 km or more. When transmitting messages in telegraph mode, this distance also increases many times. In FIG. Figure 8 shows the results of route tests of transceiver ferrite antennas in the form of a dependence of the covered distance on the transmitter power when conducting both voice communication (solid line) and when transmitting discrete messages (upper dashed line).

The proposed method of the medium-wave zone network of two-way automatic radio communication with time division of the transmission and reception channels can be useful in the development of communication systems for various departments. For example, the Ministry of Emergencies needs monitoring systems for potentially hazardous facilities in which the proposed communication network can be used. The ministry also requires public warning systems about possible dangers and alarm transmission systems. In all these systems, a communication network that is developed on the above principles can be used as a radio communication channel. This radio communication network can be used in the military units of the Ministry of Defense both for warning of a possible danger and for monitoring weapons, including vehicles. Geologists, surveyors, residents of regions with a low population density can reduce the deficit of required wireless radio communication channels in many regions remote from regional centers using the proposed option for building communication networks of the hectometer range of radio waves.

Claims (1)

  1. Method of medium-wave zone network of two-way radio communication with time division of message reception and transmission modes, in which each of the subscriber radio stations in the communication mode is periodically switched from reception to transmission and back with a frequency of 1 / (ΔT 1 + ΔT 2 ) while in a time interval ΔT 1 in transmission mode and during the time interval ΔT 2 in reception mode, and synchronization of both the calling and called subscriber radio stations with the base relay radio station is provided so that the time interval The transmission time of the subscriber radio station corresponded to the reception time interval of the base relay radio station and vice versa, so that the reception time interval of the subscriber radio station corresponded to the transmission time interval of the base relay radio station, characterized in that there are N subchannels at subcarrier frequencies different from each other in the channel bandwidth of the communication channel a multiple of Δf Hz, according to which from subscriber radio stations having low-power transmitters, at a low speed, providing high such noise immunity, discrete messages are simultaneously automatically transmitted through the base relay radio station by mutually orthogonal signals having the duration of chips T e = 1 / (Δf), and the base relay radio station operates at high speed at high speed in the compression mode in time, when received from subscriber radio stations messages are transmitted by the base relay station to the recipients alternately in time in time, while the signal for clock and loop synchronization the signal, as well as the signal for switching the “send” / “receive” messages to all subscriber radio stations of the zone radio communication network, is periodically transmitted from the side of the base relay radio station, and the subscriber radio stations, upon contact, transmit the ringing signal, the address of the called subscriber radio station, their own address , the message itself and at the end of the transmitted message the command corresponding to the end of the transmission of the message.
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2142198C1 (en) * 1997-06-05 1999-11-27 Войсковая часть 35533 Method for simplex communication from mobile user to user of wire-line telephone network
WO2004019649A2 (en) * 2002-08-23 2004-03-04 Qualcomm Incorporated Method and system for a data transmission in a communication system
WO2011041623A1 (en) * 2009-10-01 2011-04-07 Interdigital Patent Holdings, Inc. Uplink control data transmission
RU2507683C2 (en) * 2012-05-25 2014-02-20 Открытое акционерное общество "Омский научно-исследовательский институт приборостроения" (ОАО "ОНИИП") Method for zonal duplex communication with time diversity of receiving and transmitting channels

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2142198C1 (en) * 1997-06-05 1999-11-27 Войсковая часть 35533 Method for simplex communication from mobile user to user of wire-line telephone network
WO2004019649A2 (en) * 2002-08-23 2004-03-04 Qualcomm Incorporated Method and system for a data transmission in a communication system
WO2011041623A1 (en) * 2009-10-01 2011-04-07 Interdigital Patent Holdings, Inc. Uplink control data transmission
RU2507683C2 (en) * 2012-05-25 2014-02-20 Открытое акционерное общество "Омский научно-исследовательский институт приборостроения" (ОАО "ОНИИП") Method for zonal duplex communication with time diversity of receiving and transmitting channels

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