Device for receiving start-stop messages

 

Device for receiving start-stop message applies to electrical and radio and can be used in wired, radio, radio-relay and meteoric line of communication with feedback or without feedback channel. Technical result achieved - reducing the likelihood of false positives. The device includes a receiver (1), the frequency discriminator (2), containing two coordinated filter (3, 5), two of the amplitude detector (4, 6), subtractive unit (7), two non-linear element (18, 19) with the characteristics of the form y=xkwhere x and y the input and output signals, k=3,4... and the block selection signal and the sync (8), clock (9), the deciding unit (10), two keys (11, 13), a storage unit (12), Quad splitter (14), the drive (15), gate threshold unit (16). 3 Il.

The present invention relates to electro - and radio and can be used in wired, radio, radio-relay and meteoric line of communication with feedback or without feedback channel.

A device for receiving start-stop messages (I). It contains serially connected receiver, a frequency discriminator, a coherent filter, a threshold device, a differentiating stage, the pulse shaper, the article is about, the first key storage device, the second key and the sensor observation interval, and the second input of the Gating device is connected to the output of the matched filter, the control input of the first key is connected to the output of the circuit selecting the maximum signal, the signal input of a casting device connected to the output of the frequency discriminator, the output of the generator of clock pulses connected to the second input of the storage device, and its second input connected to the output of the sensor observation interval connected with a second input circuit selecting the maximum signal and control input of the second key, the output of which is an output device. However, this device has a greater chance of false positives.

Closest to the claimed is a device for receiving start-stop messages for a patent for invention 2157053, CL H 04 L 25/38. Its functional scheme is shown in Fig.1, showing: 1 - receiver; 2 - frequency discriminator; 3, 5, the first and second agreed filters; 4, 6, the first and second amplitude detectors; 7 - subtractive unit; 8 - unit selection signal and synchronization; 9 - clock (GTI); 10 - the decisive unit; 11, 13, the first and second keys;
12 - remember the Sabbath. The device prototype contains serially connected receiver 1, the frequency discriminator 2, the block selection signal and synchronization 8, GTI 9, the deciding unit 10, the first key 11, a storage unit 12, the second key 13, the output of which is an output device. In addition, it contains serially connected squarer 14, a memory 15 and strobing threshold unit 16, the output of which is connected with the control input of the second key 13, and the pulse counter 17. Thus the output of the frequency discriminator 2 is connected to a second input of the decision making unit 10, the second output of the block selection signal and synchronization 8 is connected with the second input drive 15; the output of the first key 11 is connected to the input of the Quad 14, the output of the GTI 9 is connected with the second input storage unit 12 and the input of the pulse counter 17, the output of which is connected with the second inputs of the GTI 9 and strobing threshold unit 16 and control input of the drive 15. Moreover, the frequency discriminator 2 includes serially connected first coherent filter 3 and the amplitude detector 4, the output of which is connected to the first input of the subtractive unit 7, connected in series, the second coherent filter 5 and the amplitude detector 6, the output of which is connected with the second subtractive input unit 7, the output of which is the output frequency the discriminator 2. In relation to the scheme of the prototype circuit shown in Fig.1, enlarged, in block 8 of the consolidated filter, a threshold device, a differentiating stage, the pulse shaper and gate device.

The device prototype works as follows.

The received signal consisting of a clock duration TS, manipulated the frequency of the S-element Barker code (S=7, 9, 11, 13) with the duration of each element of T, and n (n=1103information frequency-shift keyed elements of the same duration, after filtering in the receiver 1 and the frequency demodulation unit 2 is fed to the input device 8 sampling signal and the synchronization at the second output of which is formed by counting the maximum level of the synchronization signal after coherent accumulation, and on the ground a short clock pulse durationcorresponding time this reference (in the absence of interference in the end of the clock). Then the number of counts stored in the memory 15, and the output unit 9 is delayed by an interval of time T relative to the leading edge of the sync pulse generated n short pulses with a period equal to T. in block 10 in activeman pulses block 9 block 12. The same signals after the quadratic transformation Quad 14 sequentially in time are summed voltage in the block 15 and added to the already existing there (voltage reference) with the second output unit 8. If the total signal memory 15 at the end of the last n-th pulse generator 9 is greater than the threshold unit 16, the output of the latter is formed by the pulse duration nT+that opens the second key 13, and the output of the generator 9 are n clock pulses, the read information symbols from the storage unit 12 through the key 13 to the output device. This time is determined by the pulse current at the output of the counter 17.

However, this device has a greater chance of false positives.

The invention is directed to reducing the likelihood of false positives.

To eliminate this drawback in the device containing the serially connected receiver, a frequency discriminator, the block selection signal and the synchronization clock generator pulses, the deciding unit, the first key storage unit and the second key, the output of which is an output device, connected in series quadrature pulse counter, moreover, the second output of the block selection signal and synchronization connected with the second input buffer, the output of the frequency discriminator is connected to a second input of the decision making unit, the frequency discriminator includes serially connected first coherent filter and amplitude detector, connected in series, the second coherent filter and amplitude detector, and subtractive unit whose output is the output of the frequency discriminator, in addition, the inputs of the first and second agreed filters are connected and are the input of frequency discriminator entered the first and second nonlinear elements. At the entrance of the first nonlinear element is connected to the output of the first amplitude detector. The input of the second nonlinear element is connected to the output of the second amplitude detector. The outputs of the first and second nonlinear elements are connected to first and second inputs subtractive unit, respectively.

In Fig.2 presents a functional diagram of the proposed device, where indicated:
117 is the same as that of the prototype;
18, 19, the first and second nonlinear elements.

The proposed device has connected in series receiver 1, h is in store unit 12, the second key 13, the output of which is an output device. In addition, it contains serially connected squarer 14, a memory 15 and strobing threshold unit 16, the output of which is connected with the control input of the second key 13, and the pulse counter 17. Thus the output of the frequency discriminator 2 is connected to a second input of the decision making unit 10, the second output of the block selection signal and synchronization 8 is connected with the second input drive 15; the output of the first key 11 is connected to the input of the Quad 14, the output of the GTI 9 is connected with the second input storage unit 12 and the input of the pulse counter 17, the output of which is connected with the second inputs of the GTI 9 and strobing threshold unit 16 and control input of the drive 15. Moreover, the frequency discriminator 2 includes serially connected first coherent filter 3, the amplitude detector 4 and the nonlinear element 18, the output of which is connected to the first input of the subtractive unit 7, connected in series, the second coherent filter 5, the amplitude detector 6 and the nonlinear element 19, the output of which is connected with the second subtractive input unit 7, the output of which is the output of the frequency discriminator 2. The inputs of the first 3 and second 5 agreed filters soedineniyam way. The received signal consisting of a clock duration TS, manipulated the frequency of the S-element Barker code (S=7, 9, 11, 13) with the duration of each element of T, and n (n=1103information frequency-shift keyed elements of the same duration, after filtering in the receiver 1 and the frequency demodulation unit 2, containing the same non-linear elements 18 and 19 with the characteristics of the form y=xto(where x and y are the input and output signals, K= 3,4...), is fed to the input unit 8, the second output of which is formed by counting the maximum level of the synchronization signal after coherent accumulation, and on the ground a short clock pulse durationcorresponding time this reference (in the absence of interference in the end of the clock). Then the number of counts stored in the memory 15, and the output unit 9 is delayed by an interval of time T relative to the leading edge of the sync pulse generated n short pulses with a period equal to T.

In block 10 decisions on the n information symbols and the output signals of one or another polarity are stored in the clocked pulses GTI 9 block 12. The same signals after KVI added to the already existing there voltage, received from the output unit 8. If the total signal memory 15 at the end of the last n-th pulse GTI 9 is greater than the threshold unit 16, the output of the latter is formed by the pulse duration nT+that opens the second key 13, and the output GTI 9 are n clock pulses, the read information symbols from the block 12 through the key 13 to the output device. This time is determined by the pulse current at the output of the counter 17. Thus, the device can reduce the chance of false positives.

That this is indeed so, as you can see from the following.

It is known that detection of packet radio pulses with the same frequency detector should contain the memory videokursov amplitude detector (see , for example, S. 52-54 and Fig.3, 11 in the book edited by Y. M. Kazarinov "Radio system", M.: Vysshaya SHKOLA, 1990). The synchronization signal in the closest device consists of radio pulses with different frequencies corresponding to the elements "1" and "0" Barker code, and video elements are combined in a subtractive unit. As in the past is the combination of the noise from the outputs of the amplitude detectors, ELA could produce separate accumulation of the signals at the outputs of the amplitude detectors, to combine the received signals, and the result is compared with the threshold, and so on, But this detector was trained on would be very difficult. It turns out that this can be achieved in a much simpler way, after introducing the amplitude detector nonlinearity of high order.

In Fig.3 shows curves of the probability of missing synchronization signal R from the ratio h on the agreed output filter frequency discriminator obtained by numerical methods for the detection of a single radar pulse (with either of the two frequencies), the corresponding probability of false alarm equal to 10-5. The solid line in Fig.3 corresponds to the optimal detector, the extreme right - the value K=1 (nonlinear elements are not, as in most similar device), and the average K=2. As can be seen, an increase in the degree of nonlinearity leads to the loss of R. for K=3,4... get optimal results. Calculations show that a similar situation occurs when the synchronization signal consists of several elements with different frequencies. If the proposed device to increase the probability of P to values obtained when K=1 (this is achieved by increasing the threshold), it will decrease the probability of false alarm. When realini the discriminator (this is equivalent to changing characteristics of the detection of the amplitude detectors) will not change the noise when receiving information elements (see, for example, S. 466 in the book Century. I. Tikhonova "Statistical radio engineering", M: Owls.Radio, 1966).

The source of information
1. Varakin L. E. communication Systems with noise-like signals. - M.: Radio and communication, 1985, pp. 323-325, 281-287.


Claims

Device for receiving start-stop messages containing the serially connected receiver, a frequency discriminator, the block selection signal and the synchronization clock generator pulses, the deciding unit, the first key storage unit and the second key, the output of which is an output device, connected in series to the squarer, the drive and the gate threshold unit, the output of which is connected with the control input of the second key, and the pulse counter, and the second output block selection signal and synchronization connected with the second input buffer, the output of the first key is connected to the input of the Quad, the generator output clock pulses is connected to a second input storage unit and the input of the pulse counter, the output of which is connected with the second input clock pulses and strobing threshold block, and managing input buffer, the output of the frequency discriminator is connected to a second input of deciding the amplitude detector, connected in series to the second coherent filter and amplitude detector, and subtractive unit whose output is the output of the frequency discriminator, in addition, the inputs of the first and second agreed filters are connected and are the input of frequency discriminator, characterized in that the input of the first and second nonlinear elements characteristic of the species y=xkwhere x and y the input and output signals, k=3,4..., the first nonlinear element is connected to the output of the first amplitude detector and the input of the second nonlinear element is connected to the output of the second amplitude detector, the outputs of the first and second nonlinear elements connected with the first and second subtractive inputs of the block, respectively.

 

Same patents:

The invention relates to electro - and radio and can be used in wired, radio, radio-relay and meteoric line of communication with feedback or without feedback channel

The invention relates to electro - and radio and can be used to transfer multi-channel and single-channel messages in start-stop and continuous modes on the radio, microwave, optical and space lines of communication

The invention relates to electro - and radio and can be used to transfer multi-channel and single-channel messages in start-stop and continuous modes on the radio, microwave, optical and space lines of communication

The invention relates to electro - and radio and can be used in wired, radio, microwave and satellite communication systems

The invention relates to electro - and radio and can be used in wired, radio and radio-relay and meteoric line of communication with feedback and without feedback channel

The invention relates to a method of encoding binary information using time-pulse codes, as well as to a method of decoding information encoded such time-pulse codes

The decoding device // 2037272
The invention relates to means of communication and can be used in radio systems for the transmission of digital information, is subject to interference, and also in specialized treatment of digital information

The invention relates to communication technology and can be used in the development of data transmission equipment in the interests of commercial communications systems

FIELD: electrical and radio communications; underwater, radio, radio-relaying, and meteorological communication lines.

SUBSTANCE: start-stop communication system that has on sending end signal shaping and transfer unit 1 and on receiving end, receiver 2, amplitude detector 3, low-pass filter 4, first comparator 6, memory device 7, shift register 8, first decoder 9, switch 10, synchronizing unit 11, pulse shaper 12, pulse burst shaper 13, binary counters 14, 17, signal retrieval and storage device 19, and threshold device 5 is provided in addition with newly introduced second comparator 15, RS flip-flop 16, and second decoder 18.

EFFECT: reduced malfunction probability of proposed communication system.

1 cl, 3 dwg

FIELD: electrical and radio communications engineering, possible use for engineering of wire-based, radio-based, radio-relay and meteor communication lines.

SUBSTANCE: system for start-stop communication at transmitting side additionally includes: multiplexer 3, NOT circuit 4, first 5 and second 12 3-AND circuits, Temperature-trigger 6, clock pulse generator 9, binary counter 10, frequency splitter 11; at receiving side: frequency detector 16, second synchronized filter 18, first circuit AND 21, first circuit OR-NOT 22, RS-trigger 1, first 25 and second 26 circuits OR and k parallel processing blocks (24-1)-(24-k).

EFFECT: excluded additional energy costs for transmission of synchronization signal, because in communication signal a joint transmission of synchronization signal and message is implemented.

3 dwg

FIELD: electric and radio communications engineering, possible use in wired, radio, radio-relay and space communication systems.

SUBSTANCE: in the system, depending on value of modulus two sum of n information symbols at output of pseudo-random series generator, used for modulation of signal at output of transmitting side of system are two different - with different starting phases - pseudo-random series. At receiving side of system, composition of which includes pseudo-random series generator, analogical to pseudo-random series generator on transmitting side, and depending on correlation with first or second pseudo-random series, original modulus two sum is determined and compared to one that have been actually received. On basis of comparison results further processing of information is either permitted or not permitted.

EFFECT: increased probability of correct receipt of messages.

2 dwg

FIELD: information transfer systems, in particular, radio-systems for exchanging digital information in a group of clients, having hierarchical structure.

SUBSTANCE: in the digital network complex, communication units are ranked at three levels, where first level contains one main communication unit, second level contains supporting communication units, and third level contains executive communication units. Each communication unit has two receiver-transmitters, connected to signal processing device. Communication units are connected by communication channels, while main channel connects first receiver-transmitters of communication units of first and second levels, auxiliary channel connects second receiver-transmitters of first and third levels, and each autonomous communication channel connects second receiver-transmitter of one of supporting units to first receiver-transmitters of corresponding executive communication units.

EFFECT: increased reliability and minimized time of delivery of urgent messages in communication system of a group of hierarchically connected clients.

2 cl, 1 dwg

FIELD: electric and radio communications, possible use in wired, radio relay and space communication systems.

SUBSTANCE: start-stop communication system contains at transmitting side the if source (1), shift register (2), multiplexer (3), relative phase manipulator (4), transmitter (5), bearing frequency generator (11), key (12), pseudo-random series generator (8), multiplier (9), first clock impulse generator (6), AND circuits (7,13), binary counter (10). Start-stop communication system contains at receiving side the receiver (14), matched filter (15), synchronization blocks (16,21), delay line (23), demodulator (18), memorizing block (19), second clock impulse generator (22), OR circuit (17), impulse generator (25), key (20), RS-trigger (24).

EFFECT: increased throughput of start-stop communication system.

2 dwg

FIELD: radio communications, possible use in various communication systems.

SUBSTANCE: start-stop communication system contains information source, shift register, manipulator, transmitter, two clock impulse generators, pseudo-random series generator, bearing frequency generator, key, receiver, matched filter, synchronization block, demodulator, communication line, solving block, band filter, interrupter, block for phase auto-adjustment of frequency.

EFFECT: increased probability of correct message receipt, simplified manufacture of device.

2 dwg

FIELD: communications, possible use in radio lines, in wire, radio relay and meteor communication lines.

SUBSTANCE: device contains receiver, amplitude detector, threshold blocks, three impulse generators, three binary counters, clock impulse generator, frequency divider, multiplexer, distribution counter, two D-triggers, end block, logical elements, two keys, two peak detectors, three triggers, digital comparator, attenuator, shift register, comparator, low frequency filter.

EFFECT: increased resistance of communications to interference.

2 dwg

FIELD: physics, communication.

SUBSTANCE: invention concerns wireless communication, namely, to improvement of estimate of noise. Noise measurings are carried out during a part of one continuance of the longest figure of an orthogonal code. The processor (520) guidances identify an unoccupied code with small coefficient of expansion. The device (512) squeezings measures energy of a figure on the basis of an unoccupied code, and the device (516) estimates of noise shapes estimates of noise on the basis of the measured energies of figures.

EFFECT: improvement of estimate of noise.

22 cl, 6 dwg

FIELD: physics, communication.

SUBSTANCE: communication in the network of wireless communication with two relaying sites is carried out. The transmitter, the receiver and, at least, one relaying station participate in a communication session. The relaying station sends signals from the first communication link between the transmitter and relaying station to the second communication link between relaying stations and the receiver. The transfer which is carried out, at least, by one relaying station, adapts according to the estimated performances of a radio channel of the first and second communication links.

EFFECT: realisation of communication of network of wireless communication with two relaying sites.

22 cl, 1 tbl, 15 dwg

FIELD: information technologies.

SUBSTANCE: method for processing of message in MMS service, comprising the following step: after message has been received from user side, Center MMS (MMSC) sends notification to home Server of Additional Paid Services Applications that corresponds to addressees of this message on necessity to process this message in compliance with every identifier of addressee contained in this message that belongs to this Server of Additional Paid Services Applications and is contained in the message. The present invention further develops system for message processing in MMS service. Application of technical solution suggested in this invention makes it possible to successfully realise service of messages transfer in the case when terminal sends messages to several addresses that belong to one and the same Server of Additional Paid Services Applications. Besides it will make it possible to successfully reduce message traffic between MMSC and server of Additional Paid Services Applications.

EFFECT: reduced workload of communication resources, higher efficiency and reduction of expenses.

16 cl, 6 dwg

Up!