Method for transceiving by broadband signals and system for transceiving by broadband signals

FIELD: radio engineering; communication systems.

SUBSTANCE: proposed invention can be used in designing national mobile and stationary radio communication systems including effective industrial and technological ones, as well as mass produced radiophone systems. Transmission initiation time is proposed to be recorded for each of channels passing "Channel free" broadband control signal, data on transmission initiation time is to be transferred simultaneously with "Channel free" broadband control signal, and channel kept free for longest time is to be engaged; it is also proposed to connect second control output of mode-of-operation switch in subscriber code-frequency division system for transceiving by broadband signals to switchboard channel selection input.

EFFECT: enhanced reliability of system due to equalizing operating time of system channel-forming components.

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The invention relates to electrical engineering and can be used in communication systems, particularly when developing national system of mobile radio communications, including high-performance systems for technological and industrial relations in the industry, farms and farming systems, and radio systems for mass use.

The known method of reception-transmission of broadband signals (PSS) in the asynchronous address communication system with code division subscribers, wherein each subscriber is provided with individual PSS to communicate with other subscribers, for which PSS, occupying the entire allocated frequency band is divided into segments, the number of which corresponds to the number of subscribers in the system.

A device that implements the method, comprises a receiver connected through a frequency Converter, a quadrature channel and the demodulator information signals (IP) with the microphone, the output of which is connected in series through the modulator IP and generator noise-like signals is connected to the transmitter, another input connected to the oscillator reference frequency, and an additional output of the quadrature channel is connected to a second input of the generator of noise signals through the power of call (1).

The disadvantage of this method and the mouth of the STS is the low efficiency of the frequency range.

The closest in technical essence to the present invention is accordingly a method of reception-transmission of broadband signals, with the frequency code division subscribers, wherein each base station form a broadband signal, which modulate an informational message and transmitted to subscriber stations, each of which are modulated broadband signal base station, demodulator and produce informational messages, and when entering the link transmit modulated broadband signal at the base station adopted a modulated broadband signal from the corresponding subscriber station demodulator and emit an informational message on each base station form the address of the broadband signal in the set frequency range with non-overlapping frequency channels and common to all base stations managing the broadband signal "Channel free", which radiate continuously in each free frequency channel, and the subscriber station when the contact before sending informational messages take managing broadband signal "Channel free", on which is fixed a free frequency channel, dedicated to the free frequency band transmit the same for all subscriber stations control the s broadband signal "Channel busy" when the reception of which the respective base stations transmit the address of the broadband signal to the base station, subscriber station address broadband signal produce by-element accumulation, and system for reception and transmission of broadband signals with a frequency-code division subscribers, containing the Central station, base station and subscriber stations, each base station contains a reference generator frequency, generator information signals (IP) and connected in series transmitter, the element isolation and the receiver, and N modems, voice channels, and information outputs of the receiver is connected to the first inputs of modems voice channels, to the second inputs of which are connected the information outputs of the Central station, to the information inputs of the transmitter connected to the first outputs of modems voice channels, the second outputs are connected to corresponding information inputs to the Central station, the outputs of the reference frequency generator connected to the corresponding inputs of the transmitter and receiver, and each subscriber station includes a frequency synthesizer, the control unit and connected in series element isolation, the receiver, the demodulator IC, microphone, a modulator IP switch and the transmitter, the output of which is connected to the input of ale the NTA junction, and to the second input switch connected to the output of the modulator control signals (RD), and the output of the receiver to the input of the demodulator CONDITION, the first output of the frequency synthesizer is connected to the second input of the transmitter, and the second output to the second input of the receiver, while in each base station entered the modulator and demodulator utility signals (SS) and the clock generator, and the generator input reference frequency connected to the output of the frequency control of the Central station, the service output of which is connected through the SS modulator to the input utility signal transmitter, the output of the service signals of the receiver via the SS demodulator connected to the service entrance the Central station, the control inputs of which are connected with the third output modems voice channels, the output of the clock generator is connected to the third inputs of modems voice channels and to the generator IP, the output of which is connected to the fourth inputs of modems voice channels, and the subscriber station entered the delay line, the block comparison, the mode switch and connected in series consistent filter, the adder, the deciding unit, the key and the memory block, the output of the adder through a delay line connected to the second input of the adder, the output of the decision making unit is connected to the first input of the comparison, the output of which is connected to the control input the key, the output of the memory block connected to the second input of the comparison and to the generator IP, the output of which is connected to the second inputs of the demodulator IP modulator IP and to the third input of the switch control output of the microphone connected to the input of the start of the mode switch, the output of demodulator IC is connected to the information input mode switch directly, but to the controlled input of the mode switch - over control unit, the second input is connected to the alarm output of the microphone, the clock output mode switch is connected to a clock input of the decision making unit that controls the output mode switch is connected to the input of the modulator CONDITION and to the address input switch and the output of the speed control mode switch connected to the input of the frequency synthesizer, the output of demodulator SERVICES to the synchronization input of the mode switch, and the output of the receiver to the input of the matched filter, with each modem speech channel of the base station contains connected in series demodulator US and the mode switch, the address output of which is connected to the address input of the switch directly, and control output to the first input of the switch through the generator CONDITION, the output of the modulator IC is connected with the third whodo the switch, the output reference signal of the mode switch connected to the first input of the demodulator IC, an additional output of which is connected with the control input of the mode switch, with integrated information input mode switch, the input of the demodulator MOUSTACHE and a second input of the demodulator IP are the first modem input speech channel, the second and third inputs of which are respectively the second input of the modulator IP and the second generator input CONDITION, and the combined first input of the modulator IC, the second input switch and the input reference signal of the mode switch are the fourth modem input speech channel, the first and second outputs which are respectively the output switch and the first the output of demodulator IC, and the control output of the demodulator US is the third output of the modem voice channel (SU 1084998 A, H 04 B 7/12, 1984).

The disadvantages of these methods and devices may include the provision to the subscriber of any free channel, which leads to uneven loading of equipment and reduce the reliability of the system.

The technical result is to increase the reliability of the system (device) by aligning the time spent in the work canalobre elements of the device. To achieve the technical result according to which the procedure of acceptance PSS frequency code division subscribers, wherein each base station form the PSS, which modulate an informational message and transmitted to subscriber stations, each of which are modulated PSS base station, demodulator and produce informational messages, and when entering the link transmit modulated PSS, the base station adopted modulated PSS from the corresponding subscriber station demodulator and emit an informational message, each base station form PSS address in the specified frequency range with non-overlapping frequency channels and common to all base stations managing PSS "Channel free", which radiate continuously in each free frequency channel, and the subscriber station when entering the connection before sending informational messages take managing PSS "Channel free", on which is fixed a free frequency channel, dedicated to the free frequency band transmit the same for all subscriber stations managing PSS "Channel busy", when the reception of which the respective base stations transmit address PSS the base station, subscriber station address PSS allocate by atomic accumulation, with fixed start time for each of the control channels of the wideband signal “Channel free” and before the ut time start transmission simultaneously with the managing broadband signal “Channel free”, and on the subscriber and base stations carry out the occupation of the channel with the longest time remained free.

The system that implements the specified method, contains the Central station, base station and subscriber stations, each base station comprises a generator of a reference frequency generator IP and connected in series transmitter, the element isolation and the receiver, and N modems, voice channels, and information outputs of the receiver is connected to the first inputs of modems voice channels, to the second inputs of which are connected to the information outputs of the Central station, to the information inputs of the transmitter connected to the first outputs of modems voice channels, the second outputs are connected to corresponding information inputs to the Central station, the outputs of the reference frequency generator connected to the corresponding inputs of the transmitter and receiver and each subscriber station includes a frequency synthesizer, the control unit and connected in series element isolation, the receiver, the demodulator IC, microphone, a modulator IP switch and the transmitter, the output of which is connected to the input of the element isolation, and to the second input of the switch is connected to the modulator output CONDITION, and the output of the receiver to the input of the demodulator CONDITION, the first output of the frequency synthesizer is connected to the second input before the Chica, and the second output to the second input of the receiver at each base station entered the modulator and demodulator utility signals (SS) and the clock generator, and the generator input reference frequency connected to the output of the frequency control of the Central station, the service output of which is connected through a modulator SS input SS transmitter, the output of the SS receiver through the SS demodulator connected to the service entrance of the Central station, the control inputs of which are connected with the third output modems voice channels, the output of the clock generator is connected to the third inputs of modems voice channels and to the generator IP, the output of which is connected to the fourth inputs of modems voice channels, and the subscriber stations entered the delay line, the block comparison, the mode switch and connected in series consistent filter, the adder, the deciding unit, the key and the memory block, the output of the adder through a delay line connected to the second input of the adder, the output of the decision making unit is connected to the first input of the comparison, the output of which is connected to the control input of the key, the output of the memory block connected to the second input of the comparison and to the generator IP, the output of which is connected to the second inputs of the demodulator IP modulator IP and to the third input of the switch control output of the microphone connected to the input of the start PE is cluches modes, the output of demodulator IC is connected to the information input mode switch directly, but to the controlled input of the mode switch - over control unit, the second input is connected to the alarm output of the microphone, the clock output mode switch is connected to a clock input of the decision making unit that controls the output mode switch is connected to the input of the modulator CONDITION and to the address input of the switch, and the output of the speed control mode switch connected to the input of the frequency synthesizer, the output of demodulator SERVICES to the synchronization input of the mode switch, and the output of the receiver to the input of the matched filter, with each voice modem channel base station contains connected in series demodulator US and the mode switch, the address output of which is connected to the address input of the switch directly, and control output to the first input of the switch through the generator CONDITION, and the second control output of the mode switch is connected to the input channel selection switch, the output of the modulator IC is connected to the third input of the switch, the output reference signal of the mode switch connected to the first input of the demodulator IC, an additional output of which is connected with the control whodo is the mode switch, this combined information input mode switch, the input of the demodulator MOUSTACHE and a second input of the demodulator IP are the first modem input speech channel, the second and third inputs of which are respectively the second input of the modulator IP and the second generator input CONDITION, and the combined first input of the modulator IC, the second input switch and the input reference signal of the mode switch are the fourth modem input speech channel, the first and second outputs which are respectively the output switch and the first output of the demodulator IC, and the control output of the demodulator US is the third output of the modem voice channel.

Figure 1 presents the structural system electrical circuitry for reception and transmission PSS; figure 2 - is a variant of implementation of the mode switch of the base station; figure 3 - implementation option mode switch subscriber stations; figure 4 is a time chart explaining the operation of the system.

The method is as follows.

In accordance with the cellular communication all service territory is divided into large number of small zones of the base stations in the center of each of them, and provided for a system frequency band is divided into a number of sub-bands, which are allocated between neighboring base stations is mi. Each sub-band contains a certain number of non-overlapping frequency channels, each of which is associated with a single subscriber station.

To reduce the effect of mutual interference of each base station is provided PSS address, which is used by all subscriber stations in the coverage area of this base station to determine its location and transmit information.

If the frequency channel of the base station is free, i.e. it does not exchange information with the subscriber station, the transmitter of the base station continuously emits in a given frequency channel shared by all base stations managing PSS "Channel free", this signal contains information about the start time of its radiation.

This signal is used for synchronizing subscriber stations, which, successively tuning in each frequency channel, for a certain period of time make a decision about the presence of the control PSS "Channel free" in this channel. If the Manager PSS "Channel free" is detected, the frequency search ends, and the subscriber stations form and continuously transmit in the same frequency channel common to all subscriber stations managing PSS '"Channel busy" to synchronize the base station. The base station Prien is ripped managing PSS" "Channel busy subscriber stations in its frequency sub-band and instead of managing PSS "Channel free" passes the subscriber station address PSS, pointing to a free channel, the longest remaining unoccupied.

At the subscriber stations record the loss of control PSS "Channel free", and the transmission control PSS "Channel busy" stops, while in the receiving channel of the subscriber station in the presence of synchronization and the lack of information about the structure of the address PSS recover the transmitted sequence of symbols address by PSS accumulation and successive correction on comparison results. The subscriber station uses the recovered PSS address for your phone number to the base station with which a connection is established, and later on during the communication session with the base station for modulation and demodulation informational messages.

If the subscriber is in the regime of free movement and does not share information, the base station starts to put in a free channel Manager PSS "Channel free". At the transition of the mobile subscriber station in the service area of another base station repeats the procedure for finding a free channel, synchronization and entering into a relationship. Information about the location of mobile subscribers is transmitted to the base stations via a wired communication lines to the Central station, which handles the storage location information of all mobile subscribers and proizvodi switching required when it is moved.

System acceptance PSS contains Central 1, base 2 and user 3 stations, the latter includes the junction element 4, a receiver 5, a demodulator 6 CONDITION, the modulator 7 ll, the demodulator 8 IP, the modulator 9 IP, the microphone 10, the control block 11, a switch 12, a transmitter 13, the synthesizer 14 frequencies, the switch 15 modes, consistent filter 16, an adder 17, the delay line 18, a crucial block 19, block 20 comparisons, the key 21, block 22 memory generator 23 IP. The base station includes item 24 interchange, the transmitter 25, a receiver 26, the generator 27 and the reference frequency, the demodulator 28 SS modulator 29 SS generator 30 clock generator 31 IP and N modems 321-32Nvoice channels, each of which consists of a demodulator 33 IP demodulator 34 MUSTACHE, switch 35 modes of operation, the modulator 36 IP generator 37 MOUSTACHE and the switch 38 and the switch 35 modes of operation of the base station contains triggers 39 and 40 static RS-type analog Converter 41, the control line 42 of the delay unit 43 comparison, the elements 2I 44 and 45 and the inverter 46, and a memory block of time and distribution channels 61, the switch 15 modes subscriber station contains a flip-flop 47, the generator 48, the counter 49, the trigger 50, the generator 51 clock pulses, a counter 52, a decoder 53, the elements 2I 54-56, an inverter 57, the trigger 58 and 59 and the one-shot 60.

The slave system is melting as follows.

The transmitter 25 of the base station 2 can transmit information through the element 24 isolation of N frequency channels. Carrier frequencies for each frequency channel are normalized by the generator 27 reference frequency and sent to the transmitter 25 and the receiver 26. The transmitter 25 provides balanced modulation of the carrier frequencies of IP coming from the modems 321-32Nvoice channels, followed by frequency sealing, strengthening the capacity of the group signal and the radiation of radio signals broadcast through the element 24 interchange. The receiver 26 provides the necessary amplification of the received group of signals, frequency division and balanced demodulation, which are allocated IP flowing in the respective modems 321-32Nvoice channels. Transmitting and receiving frequency channels is uniquely determined if the reception is performed at the frequency fm=f1+(m-1) Fkwhere Fk- the bandwidth of the channel, a f1- initial frequency band reception, the transfer is made at the frequency f'm=f2+(m-1) Fkwhere Fk- the initial frequency of transmission.

At the subscriber station 3, the transmitted message is received at the input of the transmitter 13, which is balanced modulation of the carrier frequency from the synthesizer 14 frequencies, the gain of the modulated signal power and its radiation through the element 4 interchange. In the receiver 5 is the gain received through the element 4 interchange signals and their balanced demodulation.

In each free channel transmitter 25 of the base station 2 transmits managing PSS "Channel free", which is generated by the generator 37 US feeding him enabling signal from switch 35 modes of operation. At the second input of the generator 37 US do the sync and clock signals from the clock generator 20. The clock signal is followed up with a frequency fT=A/T where T is the duration of PSS; the number of elementary pulses in PSS equal basis PSS, and clock signals follow with frequency fWith=1/T (all generators PSS controlled clock and a clock signal with a repetition frequency fWithand ftrespectively). The address output of the switch 35 of the modes has a corresponding code, commuting, taking into account signals from the second control output modes, connected to the input channel selection switch, the output switch 38 to its first input, to which the managing PSS "Channel free" passes to the input of the transmitter 25 and radiates through the element 24 interchange (figa).

In the outgoing mode transceiver of the subscriber station 3 is activated when the subscriber of the microphone 10, the switch 15 modes the work from the microphone 10 receives the search command open channel frequency to the detection control PSS "Channel free". The detection is as follows. 5 receiver in the subscriber station 3 using the synthesizer 14 frequencies, managed code signals from the switch 15 operating modes, is tuned to a certain frequency channel. The receive path includes the junction element 4 and the receiver 5, and transmits the received signal (figb) to the input of the demodulator 6 CM, which is configured to receive the control PSS "Channel free" and demodulates the received signal for a certain period of time. If the Manager PSS "Channel free" is found, the demodulator 6, the CA sends a sequence of pulses with a frequency fWiththe switch 15 modes of operation, which stops the synthesizer 14 frequencies in this frequency channel. If the Manager PSS "Channel free" is not detected by the demodulator 6 CONDITION, the switch 15 modes of operation after a time delay gives a command to the synthesizer 14 frequencies to move to the next frequency channel.

Time t1(figb) corresponds to the moment of detection of the control PSS "Channel free". At this point, the switch 15 modes stops the synthesizer 14 frequencies and starts the modulator 7, the CA, the formation of the control PSS "Channel busy", which passes through the switch 12 to the input of the transmitter 13 and then is radiated (pigv).

Managing PSS "Channel busy" after receiving t is the act of the base station 2 (high) comes from the output of the receiver 26 to the appropriate modem 32 speech channel to the input of the demodulator 34 MUSTACHE. After the discovery Manager PSS "Channel busy" at time t2(Figg) demodulator 34, the CA sends to the switch 35 modes of operation the clock frequency fWith. At this point, the switch 35 modes on address output sets the code, which is allowed to pass through the switch 38 PSS address generator 31 IP. Thus, after time t2(figa) stops the radiation control PSS "Channel free" from the base station 2, and starts transmission of the PSS address.

At the output of demodulator 6 US subscriber stations 3 sync lost that secures the switch 15 modes, which is given the ban on the formation and passing through the switch 12 managing PSS "Channel busy". With the output of the reception path address PSS enters the chain of recovery patterns of the received signal, since the subscriber station 3 is not laid prior information about the form of address PSS. When entering the address PSS, distorted noise in the path of propagation of the radio signals to the subscriber station 3 based on the analysis of PSS address for a number of periods is determined by the structure of the signal as follows. The received signal is fed to the input of the matched filter 16, and then to the adder 17, the other input of which is through the line 18 ass is Riki is fed the output signal of the adder, delayed for a time T equal to the duration of PSS address.

Consistent filter 16, an adder 17 and line 18 delays are recirculator-drive, which is the optimal device for receiving a periodic sequence of pulses and provides the necessary filtering address PSS from interference in the channel. Filtered address PSS as the sum of PSS for several periods comes to the deciding unit 19, the other input of which receives Gating pulses with a frequency fT. From the output of the decision making block address PSS in the form of a sequence of binary symbols is supplied to the block 20 comparison and through the key 21 in the memory block 22. When a large number of savings reduces the number of errors. Adopted in block 22 of the memory sequence controls the generator 23 IP, the output of which address PSS through the switch 12 is supplied to the transmitter 13 and is radiated. At the beginning of the work in restoring the structure adopted PSS address may differ substantially transmitted from the base station 2. However, with the growing number of savings number of errors is reduced and the time will come when their number reaches the specified level.

This point determines the block 20 comparisons, which locks the key 21, and the block memory 22 stores a code sequence last address PSS. Further generator is 23 IP periodically with the frequency of address forms PSS, structure which is recorded in the memory block 22, and sends the address PSS as a reference code to the inputs of the modulator 9 IP and demodulator 8 IP. The output of the modulator 9 IP through the switch 12 is connected to the input of the transmitter 13. In the transmitting and receiving paths of the subscriber station 3 is ready for transmission and reception of information.

Since t3(Figg)received at the base station 2 address PSS is supplied to the demodulator 33 IP and on the information input switch 35 modes in which mutual synchronization delay the received address PSS and the reference signal generator 31 IP, and comparing these signals to identify errors caused by interference in the path radio propagation and inaccurate restoration of the structure of the signal at the subscriber station 3. Once the number of errors will be less than acceptable, the switch 35 modes gives to the switch 38 command connect the output of the modulator 36 IP to the input of the transmitter 25, the choice of which is taking into account the time of the vacancy transfer speech signals.

Thus, the transmitting and receiving paths of the base station 2 is ready to exchange messages with the subscriber station 3 and the Central station 1. At time t4(figb) ends the mode of occurrence in synchronism to the subscriber and base stations, starts sending and receiving informational messages.

In the reception mode information from subscribers in the demodulator 33 IP base station 2 is allocated a sign transmitted from the subscriber station 3, which with the additional output of the demodulator 33 IP enters the switch 35 modes of operation. When an outgoing call, this feature accompanies transmitted to the Central station discrete message containing the called party number. On this basis, the switch 35 modes keeps the switch 38 which ensures the transmission of information signals from the output of the modulator 36 IP transmitter 25. Thus provided with the transfer of telephone messages between the Central 1, base 2 and user 3 stations.

In the regime of free movement of subscribers in the service area of the Central station 1 is continuously recorded the location of each mobile subscriber station 3. With this purpose from the subscriber station 3, the area of the base station 2, is transferred to a private room, accompanied by the appropriate sign. In this case, the switch 35 modes of operation after transmission to the Central station 1 number of new subscriber stations 3 switches the switch 38 to the passage of the control PSS "Channel free" from the generator 37 MUSTACHE. At Central the station 1 registers the new location of the subscriber in the system, and this frequency channel is freed.

For the implementation of an incoming call (call to mobile subscriber from the Central station 1) to the base station 2 work modulator 29 SS and the demodulator 28 SS. Through the modulator 29 SS transmitted coming from the Central station 1 number of the called subscriber and service information. When the subscriber free of negotiations, the transceiver of the subscriber station 3 is configured to receive a call signal. Upon detection of individual subscriber stations 3 in the General call flow from the output of the demodulator 8 IP on the microphone 10 rings of the subscriber and the switch 15 modes of operation command setting synthesizer 14 frequencies given free frequency channel.

When the movement of a person in the service area for the signal level at the output of the demodulator 8 IP user station 3 is monitored by the control block 11, which depending on the state of the microphone 10 (enabled or disabled) gives the switch 15 modes one of two commands: to configure the modulator 7, the CA, the formation of PSS service "Deterioration" or to find a new free frequency channel Manager at PSS "Channel free" to send subscriber station 3.

When the microphone PSS service "Deterioration" to take the W on the base station 2 and transmitted to the Central station which configures the receivers of the neighboring base stations upon detection of PSS service "Deterioration", selects a new frequency channel, which is provided to the subscriber station 3 to continue receiving and transmitting telephone messages. The neighboring base stations detect utility PSS, "Deterioration" is performed by the demodulator 28 SS after adjustment of the receiver 26 to the corresponding frequency channel commands to the generator 27 and the reference frequency from the Central station 1.

When the microphone 10, the procedure of entering into synchronism and transfer of subscriber stations 3 are similar to the operations performed to determine a caller's location when enabled subscriber station 3.

When switching station triggers 39 and 40 of switch 35 modes are in the zero state by a reset signal received at the input R. the Direct outputs of the triggers 39 and 40 form a two-digit code to control the operation of switch 38. In the initial state (00) is provided by switching the first input of the switch 38 to the passage of the control PSS "Channel free" from the generator 37 MUSTACHE, which is controlled by a signal from the inverted output of the trigger 40.

When entering from the demodulator 34 MUSTACHE sequence of clock pulses trigger 40, while the new code control the population (01) provides such a mode switch 38, when the input of the transmitter 25 is supplied address PSS, and radiation control PSS "Channel free" stops with the memory block time and distribution channels 61 sets the selection mode of the channel equipment of the switch 38.

To synchronize the base station analog Converter 41 analyzes the delay time of the signal from the subscriber station 3, and adjusts managed in line 42 delays the delay signal from the generator 31 IP at the input of the demodulator 33 IP. The delayed signal is simultaneously fed to a block 43 comparison to determine the number of errors in the address PSS, restored to the subscriber station 3. If their number exceeds the threshold level, the radiation of the address PSS continues, otherwise, the signal output unit 43 of the comparison is supplied to the elements 2I 44 and 45, which examines the presence of the sign taken on the base station messages.

At zero sign triggers 39 and 40 of switch 35 modes are set in the initial state to resume transmitting a control PSS "Channel free".

In the presence of a single symptom of the trigger 39 is provided in the state of the logical unit and the two-digit code (11) for controlling the output of the switch 35 modes of operation switches the switch 38 in the transfer mode, the message is the second from the modulator 36 IP.

Enabling the subscriber station 3 triggers 47 and 59 of switch 15 modes are in the zero state, and a generator 48, which with the help of the counter 49 generates a control code for the synthesizer 14 frequencies.

Upon detection of the control PSS "Channel free" signal from demodulator 6, the CA sets the trigger 47 in a single position, the generator 48 is stopped and the frequency search stops.

The signal from the direct output of the trigger 47 is supplied to the generator 51 of clock pulses and the trigger 50, the output of which provides the transmission control PSS "Channel busy".

The counter 52 and the decoder 53 form the vertical synchronizing signals of frequency frcoming on the elements 2I 55 and 56. If the control PSS "Channel free" signal from the output element 2I 55 carries out a temporary adjustment of the generator 51 of clock pulses. Since the termination of the receipt of the control PSS "Channel free" signal from the output of the inverter 57 causes the trigger 50 to the zero state by a trigger 58 permit the passage of clock pulses through the element 2I 54 to the input of the decision making unit 19. The trigger 59 and 60 provides a one-shot forming PSS "Deterioration". At the transition of the subscriber in a new area he is given a new frequency channel, the code which is transmitted from the Central station is fed from the output of the demodulator 8 IP on the counter 49 switch 15 modes of operation.

The proposed method, which consists in providing each base station PSS address for communication with subscribers, you can greatly reduce the necessary volume of system signals and thereby to achieve a more efficient use of the frequency range at a constant quality of the transmitted messages, as well as to improve the reliability of the system.

The lack of subscriber stations of a priori information about the structure of the address PSS base stations and restore them to send messages to significantly reduce the amount of memory subscriber stations and to exclude from the equipment of the base station apparatus of the formation and processing of signals of all subscriber stations.

1. The way of reception and transmission of broadband signals with a frequency-code division subscribers, wherein each base station form a broadband signal, which modulate an informational message and transmitted to subscriber stations, each of which are modulated broadband signal base station, demodulator and produce informational messages, and when entering the link transmit modulated broadband signal at the base station adopted a modulated broadband signal from the corresponding subscriber station demodulator and emit an informational message, and the each base station form the address of the broadband signal in the frequency range from non-overlapping frequency channels and common to all base stations managing broadband signal "Channel free", which emit continuously in each free frequency channel, and the subscriber station when the contact before sending informational messages take managing broadband signal "Channel free", on which is fixed a free frequency channel, dedicated to the free frequency band transmit the same for all subscriber stations managing broadband signal "Channel busy", when the reception of which the respective base stations transmit the address of the broadband signal to the base station, subscriber station address broadband signal produce by-element accumulation, with fixed start time for each of the control channels of the wideband signal “Channel free” and transmit data time start transmission simultaneously with the managing broadband signal “Channel free”, and on the subscriber and base stations carry out the occupation of the channel with the longest time remained free.

2. System for reception and transmission of broadband signals with a frequency-code division subscribers, containing the Central station, base station and subscriber stations, each base station contains a reference generator frequency, generator information signals (IP) and connected in series transmitter element RA is binding and the receiver, and N modems, voice channels, and information outputs of the receiver is connected to the first inputs of modems voice channels, to the second inputs of which are connected to the information outputs of the Central station, to the information inputs of the transmitter connected to the first outputs of modems voice channels, the second outputs are connected to corresponding information inputs to the Central station, the outputs of the reference frequency generator connected to the corresponding inputs of the transmitter and receiver, and each subscriber station includes a frequency synthesizer, the control unit and connected in series element isolation, the receiver, the demodulator IC, microphone, a modulator IP switch and the transmitter, the output of which is connected to the input element interchange, and to the second input switch connected to the output of the modulator control signals (RD), and the output of the receiver to the input of the demodulator CONDITION, the first output of the frequency synthesizer is connected to the second input of the transmitter, and the second output to the second input of the receiver, and each base station contains the modulator and demodulator utility signals (SS) and the clock generator, and the generator input reference frequency connected to the output of the frequency control of the Central station, the service output of which is connected through the SS modulator to the input utility signal PE is adamcik, the output of the service signals of the receiver via the SS demodulator connected to the service entrance of the Central station, the control inputs of which are connected with the third output modems voice channels, the output of the clock generator is connected to the third inputs of modems voice channels and to the generator IP, the output of which is connected to the fourth inputs of modems voice channels, and the subscriber station includes a delay line, the block comparison, the mode switch and connected in series consistent filter, the adder, the deciding unit, the key and the memory block, the output of the adder through a delay line connected to the second input of the adder, the output of the decision making unit is connected to the first input of the comparison, the output of which is connected to the control input of the key, the output of the memory block connected to the second input of the comparison and to the generator IP, the output of which is connected to the second inputs of the demodulator IP modulator IP and to the third input of the switch control output of the microphone connected to the input of the start of the mode switch, the output of demodulator IC is connected to the information input mode switch directly, but to the controlled input of the mode switch - over control unit, the second input is connected to the alarm output of the microphone, the clock output mode switch is in the work connected with a clock input of the decision making unit, control output of the mode switch is connected to the input of the modulator CONDITION and to the address input of the switch, and the output of the speed control mode switch connected to the input of the frequency synthesizer, the output of demodulator SERVICES to the synchronization input of the mode switch, and the output of the receiver to the input of the matched filter, each modem speech channel of the base station contains connected in series demodulator US and the mode switch, the address output of which is connected to the address input of the switch directly, the first control output to the first input of the switch through the generator CONDITION, and the second control output of the mode switch is connected to the selection input channel switch, the output of the modulator IC is connected to the third input of the switch, the output reference signal of the mode switch connected to the first input of the demodulator IC, an additional output of which is connected with the control input of the mode switch, with integrated information input mode switch, the input of the demodulator MOUSTACHE and a second input of the demodulator IP are the first modem input speech channel, the second and third inputs of which are respectively the second input of the modulator IP and the second generator input CONDITION, and the combined first the d input of the modulator IP the second switch input and the reference input signal of the mode switch are the fourth modem input speech channel, the first and second outputs which are respectively the output switch and the first output of the demodulator IC, and the control output of the demodulator US is the third output of the modem voice channel.



 

Same patents:

FIELD: radiophone groups servicing distant subscribers.

SUBSTANCE: proposed radiophone system has base station, plurality of distant subscriber stations, group of modems, each affording direct digital synthesizing of any frequency identifying frequency channel within serial time spaces, and cluster controller incorporating means for synchronizing modems with base station and used to submit any of modems to support communications between subscriber stations and base station during sequential time intervals.

EFFECT: enhanced quality of voice information.

12 cl, 11 dwg

The invention relates to a radio network

The invention relates to the synchronization of telecommunication networks, namely, to build systems network clock synchronization with a hierarchical structure, with a forced synchronization on the principle of “master-slave”

The invention relates to the field of digital technology and can be used for synchronization and how to resolve the phase ambiguity of signals communication systems

The invention relates to a device for radio communication, in particular to a method and device for implementing the method synchronize the communication is divided into frames of data across the asynchronous base station in the cellular system

The invention relates to a device and method for forming words frame synchronization in an asynchronous communication system with multiple access and code division multiplexing

The invention relates to the transmission of digital video and data network digital video

The invention relates to the field of radio and digital technology

The invention relates to techniques for digital communication, namely, devices for frame synchronization in digital communication systems with a temporary seal

The invention relates to a synchronous digital hierarchy network (SDH networks)

The invention relates to communication technology

The invention relates to a system and method of smoothing the effects of signal fading time shadows or severe channel distortion in the system broadcast audio

The invention relates to electrical engineering and can be used in data acquisition systems with time division correspondents

FIELD: radio engineering; communication systems.

SUBSTANCE: proposed invention can be used in designing national mobile and stationary radio communication systems including effective industrial and technological ones, as well as mass produced radiophone systems. Transmission initiation time is proposed to be recorded for each of channels passing "Channel free" broadband control signal, data on transmission initiation time is to be transferred simultaneously with "Channel free" broadband control signal, and channel kept free for longest time is to be engaged; it is also proposed to connect second control output of mode-of-operation switch in subscriber code-frequency division system for transceiving by broadband signals to switchboard channel selection input.

EFFECT: enhanced reliability of system due to equalizing operating time of system channel-forming components.

2 cl, 4 dwg

FIELD: automatic adaptive high frequency packet radio communications.

SUBSTANCE: each high frequency ground station contains at least one additional high frequency receiver for "surface to surface" communication and at least one additional "surface to surface" demodulator of one-tone multi-positional phase-manipulated signal, output of which is connected to additional information input of high frequency controller of ground station, and input is connected to output of additional high frequency "surface to surface" receiver, information input of which is connected to common high frequency receiving antenna, while control input is connected to additional control output of high frequency controller of ground station.

EFFECT: prevented disconnection from "air to surface" data exchange system of technically operable high frequency ground stations which became inaccessible for ground communications sub-system for due to various reasons, and also provision of possible connection to high frequency "air to surface" data exchange system of high frequency ground stations, having no access to ground communication network due to absence of ground communication infrastructure at remote locations, where these high frequency ground stations are positioned.

2 cl, 12 dwg, 2 tbl

FIELD: the invention refers to the field of radio communication and may be used in duplex radio lines of communication with using complex signals.

SUBSTANCE: the achieved technical result is expansion of functional possibilities of the mode of radio communication by way of realization of the duplex principle of transmission and reception of discrete and analog information between two points on two frequencies. In the mode of radio communication at the first point a formed complex signal with combined phase manipulation and amplitude modulation is converted by frequency with using frequency ωr1 of the first heterodyne, the voltage of the first intermediate frequency is singled out equal to the sum of frequencies ωint1= ωс + ωr1, intensified on power and radiated on frequency ω1int1r2 and then a complex signal is received on frequency ω2r1, intensified, converted on frequency with using frequency ωr2 of the second heterodyne, the voltage of the second intermediate frequency is singled out and limited, an additional information channel is singled out and transmitted. At that at the second point a complex signal is radiated on frequency ω2 and received on frequency ω1.

EFFECT: expands functional possibilities of the mode.

4 dwg

FIELD: communications engineering.

SUBSTANCE: the system consists of transmitting sections of client stations and receiving section of central station, where each transmitting section of client station contains clock impulse generator, timer, information source, information signal generator, encoded signal generator, double frequency manipulation signal generator, modulator, transmitter, transmitting antenna, frequency synthesizer and generator of pseudo-random numbers, and receiving section of central station contains receiving antenna, demodulator, signal selector, block for selecting additional series, first and second two-channel synchronized filters, first and second subtracters, interference compensator, information receiver, frequency synthesizer, generator of pseudo-random numbers and generator of clock impulse.

EFFECT: due to new set of substantial signs, it becomes possible to expand area of application for claimed system, in particular, to increase interference resistance without expansion of frequency resource and reduction of system traffic capacity.

2 cl, 11 dwg, 1 tbl

FIELD: electricity.

SUBSTANCE: invention may be used for transmission of discrete information in troposcatter links. Adaptive system of radio communication on the transmitting side consists of the following: time multiplex unit, probing mode control unit, probing commands combination unit, probing commands decoder, manipulator of information signals, frequency synthesizer, combination unit of optimal frequency number commands, combination unit of frequency coherence band commands, unit of transmission signals combination, probing signals manipulator, selector of probing commands and probing commands coder, on the receiving side adaptive system of radio communication consists of unit of optimal frequency selection, unit of frequency coherence band commands combination, unit of frequency coherence band estimate, frequency mixer, frequency synthesizer, probing mode control unit, unit of probing commands combination, decision-making unit, unit of channel power budget reserve measurement, probing commands coder, unit of optimal frequency number commands combination and demodulator.

EFFECT: increases noise-immunity and availability ratio.

2 dwg

FIELD: communications.

SUBSTANCE: information transmission and reception system (ITRS) contains sequentially functionally related heterogeneous sources of information, compression unit (including combinational unit) for binary digital streams (BDS), high-frequency signal modulator with carrier generator, transmitter, receiver, high-frequency signal demodulator, unit for decompression of digital stream into BDS, information consumers and if necessary, formatting and multiple access units (e.g. with code division), at that, compression unit is made with possibility to execute compression during orderly, in one stroke reading of BDS binary digits and their conversion into the stream of Mn-characters, and decompression unit is made with possibility of one-stroke conversion in its processor the stream of Mn-characters into BDSs presented orderly, just as during reading to consumers.

EFFECT: enhancement of frequency resource usage efficiency.

2 cl, 1 dwg,1 tbl

FIELD: communications.

SUBSTANCE: at transmitting side, information sources, if necessary, format, compress binary digital streams (BDS) in compression unit (including combinational unit) and modulate them in high-frequency modulator, convert into signal stream, and at receiving side in reverse order signal stream is demodulated in high-frequency demodulator, converted into compressed BDS stream, these BDS's are decompressed in decompression unit, formatted, if necessary, and presented to information consumers. If necessary, at transmitting side signal streams of other groups of information sources are summarised and at receiving side they are separated in multiple access units. At that, in compression unit processor binary digits of BDS are orderly read in one stroke and converted into stream of Mn-ary characters, and in decompression unit processor stream of Mn-ary characters are converted in one stroke into BDSs which are orderly, just as during reading are presented to consumers.

EFFECT: enhancement of frequency resource usage efficiency.

2 cl, 1 dwg, 1 tbl

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