Multi-channel communication system
(57) Abstract:The invention relates to electro - and radio and can be used for sealing wire, radio, microwave, optical and space lines of communication. The technical result is increased reliability and simplification of the receiving part of the system. Multi-channel communication system includes a transmitting side encodes the block 1, the synchronizer 2, time pointing device 3, a transmitter 4, synchroblog 5, at the receiving side, the receiver 6, a coherent filter 7, a comparator 8, the first 9 and a third storage device 10, a decoder 11, the device of the sample and hold signal 12, synchroblog 13, the pulse shaper 14, the binary counter 15, the communication line 16. 1 Il. The invention relates to electro - and radio and can be used for sealing wire, radio, microwave, optical and satellite communication lines.Known multi-channel communication system with a transmitting side To a multiplier products, the driver signals the address transfer, the logical processing unit, the transmitter and synchroblog; at the receiving side (2to-1) multiplier products, integrators, key blocks, the decoder and the recipients (1).However, the Wu is a multichannel communication system (2).It contains on the transmission side encodes the block consisting of the driver signals the address transfer and shaper group signal, the transmitter and synchroblog, and at the receiving side of the receiver, the block signal processing, solver, decoder, synchroblog and the driver signals of the addresses of the reception.The former group signal are combined here To multiplier products and the adder in the block of signal processing - 2tochannel processing and in the final device - adders and crucial blocks. Synchroblog on the transmitting and the receiving side provides the performance of a system.However, this system is complex and expensive, has low reliability and difficult to manufacture.The invention is aimed at simplifying the receiving system to improve its overall reliability and reduce the cost of manufacture.To do this in a multi-channel communication system on the transmission side in encoding the block forming unit group of the signal is performed in a time manipulator, and the driver signals the address transfer is in the form of a synchronizer, a first input connected to (K+1)-th entry of temporary manipulator, and the second with (K+2)-th input and the input is La (matched filter), introduced sequentially connected to the comparator and the first and second storage devices, the device of the sample and hold signal, the signal input of which is connected to the output of the matched filter, the clock input to the comparator output, and the output is connected to a second signal input of the comparator and connected in series shaper pulse and a binary counter whose outputs are connected to signal inputs of the first storage device, and the clock input of the comparator is connected to the output of the pulse shaper, the second clock inputs of the binary counter and a sample and hold signal is combined with a clock input of the second storage device and is connected to the output of synchroblog, connected to the input of the shaper pulses, the outputs of the second storage device are connected to corresponding inputs of the decoder.The drawing shows a functional diagram of the proposed multi-channel communication system.Multi-channel communication system includes a transmitting side encodes the block 1, consisting of a synchronizer 2 and temporal manipulator 3, the first To inputs, which are inputs of the system, (K+1)-th and (K+2)-th inputs of Sedogo manipulator 3, and synchroblog 5, an input connected to the second output of the synchronizer 2, and the output connected to the second input of the transmitter 4, and at the receiving side is connected in series receiver 6, a coherent filter (SF) 7, a comparator 8, the first storage device (memory) 9, a second storage device (memory) 10 and the decoder 11, the device of the sample and hold signal (water economy Department) 12, a signal input which is connected to the output SF 7, the clock input to the output of the comparator 8, and the output is connected to a second signal input of the comparator 8, and connected in series synchroblog 13, the inlet of which is connected to the second clock output of the receiver 6, the pulse shaper (PHI) 14, and a binary counter (DC) 15 whose outputs are connected to respective signal inputs of the memory 9, and the clock input of the comparator 8 is connected to the output PHI 14, the second clock inputs of the water economy Department of 12 and a DC 15 combined with a clock input of the memory 10 and is connected to the output of synchroblog 13; transmitting and receiving side of the system are connected through the communication line 16, the outputs of the decoder 11 are system outputs.Multi-channel system operates as follows.On the transmission side For (K= 1,2,3...) synchronous channel signal consisting of symbols the config manipulator 3, so that its output at times=ST/2k(where S is the value of the input binary number in decimal form) relative to the leading edge of the pulse, the current at the second output of the synchronizer 2 and coincides with the beginning of the channel symbols is formed a rectangular pulse (or pseudo-random signal) of duration T/2kequal to the repetition period of short pulses from the first output of the synchronizer 2. Thus, each combination of input channel symbols corresponds to one of the 2ktemporary provisions of the signal block 3 on the time interval 0, T (and so on). Received multicast signal together with the synchronization signals coming from synchroblog 5 and bearing information about the beginning of the channel symbols transmitted by the transmitter 4 through the communication line 16. At the receiving side group signal along with interference from the output of the receiver 6, optimally processed in SF 7 and is supplied to the signal inputs of the comparator 8 and the water economy Department 12. The inputs PHI 14, the water economy Department 12, GS 15, and the memory 10 is supplied with short pulses with a period T equal to the duration information symbols generated in synchroblog 13 to the output clock of the receiver 6 and coincides with the moments of the eye is X 12, DS 15 and the memory 10, and the output PHI 14 is formed 2kshort pulses with a period T/2kcorresponding time possible positions of the maxima of the filtered signal. At the time the first of them (leading edge) of the output signal SF 7 is supplied to the comparator 8 and compared to the level of the signal input at the second signal input unit, the water economy Department 12 (in this case zero). If it is more recent, then the output of comparator 8 is formed by a voltage drop, which opens the entrance of the water economy Department of 12 and allows it to remember the level of the output signal SF 7. This procedure is repeated 2ktime. As a result, by the time of arrival of the second pulse from the output of block 13 in the water economy Department 12 is recorded the highest level of the output signal SF 7 for a time equal to T. the Binary K-bit counter BC 15 is designed for counting the number of pulses entering from the output of the PHI block 14. Whenever the output of comparator 8, you get a voltage drop readings K digits DC 15 is read into the memory 9. This allows you to fix the number of temporary positions most of the output signals SF 7 in the time interval T. In the time of arrival of the second pulse with W input binary number in channel symbols, which in the absence of interference coincide with the transmitted information symbols.Thus, the proposed multi-channel communication system allows us to simplify the receiving part, to increase the reliability and reduce the cost of manufacturing.Sources of information
1. USSR author's certificate N 809611, H 04 J 11/00, from 28.02.81.2. USSR author's certificate N 907834, H 04 J 11/00, from 23.02.82. Multi-channel communication system with a transmitting side encodes the block consisting of the driver signals the address transfer and shaper group signal, the transmitter and synchroblog, and the first To the input of the shaper group signal are outputs of the system, and To a combination of inputs connected to respective outputs of the driver signals the address transfer, synchrolift through which synchroblog connected to the second input of the transmitter, the first input connected to the output of the shaper group signal, and at the receiving side connected in series receiver and the block signal processing, synchroblog, an input connected to the clock output of the receiver, and a decoder, the outputs of which are outputs of the system, and the shaper group signal is executed in a time manipulator, and the driver signals the address transfer in the form of a synchronizer, the first output of which is connected to the (K + 1)-th entry of temporary manipulator, the second with (K + 2)-th input and the input of synchroblog, and at the receiving side block of the signal processing executed in the form of a matched filter and introduced sequentially connected to the comparator and the first and second storage devices, the device of the sample and hold signal, the signal input of which is connected to the output of the matched filter, the clock input to the output of the comparator, and the output is connected to a second signal input of the comparator, and connected in series shaper pulse and a binary counter whose outputs are connected to signal inputs of the first storage device, and the clock input of the comparator is connected to the output of the pulse shaper, the second clock inputs of the binary counter and a sample and hold signal is combined with a clock input of the second storage device and is connected to the output of synchroblog connected to the input of the shaper pulses, the outputs of the second storage device are connected to corresponding inputs of the decoder.
FIELD: communications engineering.
SUBSTANCE: proposed band selection method for mobile orthogonal frequency division multiple access communication system includes following steps to classify procedures of band selection between sending end and receiving ends with respect to original band selection process, passband width selection process, and periodic band selection process: determination of source band selection code (SC)number for source band selection process; SC number to request passband width for passband width request selection process and periodic SC number for periodic band selection process; determination of periodic SC deferment value in compliance with periodic SC number, and transmission of source SCs, passband width request SC, periodic SCs, and periodic SC deferment values on receiving ends.
EFFECT: minimized time for band selection access.
22 cl, 3 dwg, 4 tbl
FIELD: communications engineering.
SUBSTANCE: stationary wireless access system has, as a rule, user's room equipment unit connected through Ethernet interface to personal computer or to local network and base station unit connected through Ethernet interface to network. User's room equipment unit as such is easily installed by user while base station unit is usually mounted on mast at distance of 1 to 5 miles (1/6 to 8 km) from user's room equipment unit. Both the latter and base station unit usually incorporate integrated transceiver/data switch that provides for radio-frequency communications in the range of 2.5 to 2.686 GHz. Multiplexing with orthogonal frequency division of signals is used during transmission between user's room equipment units and base station ones over ascending and descending lines.
EFFECT: provision for using outwardly accessible antenna affording transmission within line-of-sight range.
70 cl, 19 dwg
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: mobile telecommunication systems.
SUBSTANCE: device for decreasing relation of pike power to average power signal, sent along N(=2r) sub-bearing lines in transmitting device, having encoders for block encoding of w input data, where r - real number > 2, and output of N code symbols, has: serial-parallel converter for transforming data flow to w-(r-2) parallel data flows, where w - length of information word, first coder for receipt of w/2 parallel data flows from w-(r-2) parallel data flows from serial/parallel converter, block encoding of w/2 parallel data flows and output of N/2 first code symbols, generator of input operators for generation of r-2 data flows of input operators, in accordance to w-(r-2) parallel data flows, and second coder for receiving parallel data flows from serial/parallel converter, which were not received at first coder and (r-2) data flows from input operators, block encoding of received data flows and output of N/2 second code symbols, while r-2 data flows of input operators provide for complementarity of N code symbols.
EFFECT: higher efficiency, higher reliability.
6 cl, 22 dwg
FIELD: engineering of devices and methods for receipt and synchronization in direct digital satellite broadcast system.
SUBSTANCE: satellite system uses modulation with temporal signals separation and single-frequency network of ground-based re-emitting stations, each of which introduces a delay to ground signal. Delay allows to provide for coincidence of time of receipt of early modulated signal in the center of ground broadcasting zone with time of receipt of appropriate late modulated signal, thus improving switching between ground and satellite signals in receiver. Delay also compensates processing delay, occurring during conversion of satellite modulated stream under direct visibility conditions to multi-frequency modulated stream for transmission of satellite modulated stream under direct visibility conditions to user receivers. Delay is also adjusted in accordance to distance difference between each ground-based re-emitting station and satellite and between each station and center of ground-based broadcasting zone. Adjustment as described above optimizes receipt of temporal signals separation modulated and multi-frequency modulated signals by means of synchronization in the center of single-frequency system of phase of multi-frequency modulated signals, re-emitted from re-emitting stations of single-frequency system.
EFFECT: increased quality of radio-signal receipt.
8 cl, 12 dwg
FIELD: engineering of devices for generating series of preamble with low ratio of pike to average power in communications system with orthogonal multiplexing and frequency separation of channels.
SUBSTANCE: in accordance to method, first series of preamble is generated, wherein odd data of input series of preamble are transformed to zero data, and even data of aforementioned series are transformed to nonzero data, first series of preamble is transmitted through one of two antennas, second preamble series is generated, wherein even data of input series of preamble are transformed to zero data, and odd data of aforementioned series are transformed to nonzero data, second series of preamble is transmitted through another antenna.
EFFECT: increased efficiency.
6 cl, 10 dwg
FIELD: electric communications engineering, in particular, engineering of multichannel communication systems.
SUBSTANCE: system for transmitting discontinuous information contains at transmitting side information sources, multipliers, adder, clock generator, Walsh functions generator, 2n keys (where 2n - number of outputs of Walsh functions generator) and frequency splitter, two elements of one-sided conductivity and 2n additional multipliers, and on receiving side - clock generator, Walsh functions generator, multipliers, integrators, information receivers, 2n keys and frequency splitter, two elements of one-sided conductivity and 2n additional multipliers. As a new addition, on transmitting side two one-sided conductivity elements are inserted and 2n additional multipliers, and on receiving side - two one-sided conductivity elements and 2n additional multipliers.
EFFECT: decreased frequency band due to decreased effective width of channel carriers spectrum.
6 dwg, 1 tbl
FIELD: engineering of communication systems, using multi-access layout based on orthogonal multiplexing circuit with frequency division.
SUBSTANCE: communication system divides whole range of frequencies onto a set of sub-frequency ranges. Receiver of information about quality of channels receives information about quality of channels for each one of a set of frame cells, occupied during first time span by a set of frequency-time cells, occupied by second time span and a given number of sub-frequency ranges, transferred via check communication channel from receiver. Module for sorting frame cells analyzes information about quality of check communication channels and sorts frame cells in accordance to information about quality of channels. Module for assigning sub-channels, if transfer data exist, transfers data through a frame cell with best channel quality among other frame cells.
EFFECT: increased data transfer speed.
5 cl, 6 dwg
FIELD: electric radio engineering, possible use for increasing quality of electric communication, especially in multi-frequency wireless communication systems.
SUBSTANCE: method for decreasing ratio of peak signal power to its average ratio PAPR in multi-frequency communication systems, in which information symbol is formed by a set of signals, each one of which is centered on one of multiple bearing frequencies, is characterized by the fact that in transmitter a set of bearing frequencies is divided on several sections - subsets of bearing frequencies, information symbol, PAPR value of which does not exceed required threshold PAPR0, is transferred via all carriers, information symbol, value PAPR of which exceeds required threshold PAPR0 is divided on several sub-symbol sections, while number of these sections equals number of sub-carrier subsets, each section of symbol is transferred same as full symbol, wherein data are only transferred on one group of carriers, while other carriers are not modulated, in receiver, arrival of incomplete symbol is identified by analysis of amplitudes of carrier signals, which are not modulated in case of symbol division. Multi-frequency communication system is characterized by construction of receiver and transmitter, adapted for execution of operations, included in proposed method.
EFFECT: preservation of high channel capacity with simplified correction procedure.
2 cl, 12 dwg
FIELD: the invention refers to the field of radio technique and may be used for transmission of information with the aid of signals with orthogonal frequency multiplexing.
SUBSTANCE: the technical result is in increasing accuracy of synchronization of signals with orthogonal frequency multiplexing and that in its turn provides reduction of error possibility at reception of these signals even in such complex propagation conditions as shot-wave range channels. For this in the receiving set of the known equipment two memory blocks, two commutators, a maximum choice selection block, a meter and a time intervals calculation block are introduced.
EFFECT: increases accuracy of signals.
FIELD: communications engineering.
SUBSTANCE: network additionally has topology forming device, which has topology forming block, separating information about changes of configuration of whole network from address portion of frame, while address of transferred information frame additionally includes network topology code. Device for forming topology transforms topology code to extensive ordered structure, to provide flexible control over configuration of network without substantial increases of computing resource, while for transferring information about network topology it is enough to send only the topology code, which unambiguously describes topology of whole network.
EFFECT: flexible and easily extended network configuration without significant increase of computer power and increased information transfer speed.
FIELD: multiplexing technology with time separation, in particular, method for transmitting data with use of multiplexing with time separation along connecting circuit and engineering of bridge connectors for realization of said technology.
SUBSTANCE: invention has plant of high speed serial line on connecting panel for connecting central network commutation panel and service panels; multiplexing or alternation of data of multiplexing with time separation on the transmitting side; and following transfer in packet transfer mode along high speed serial line on connecting panel; on the receiving side - serial receipt of aforementioned data and de-multiplexing or reverse alternation of these to multiple time separation multiplexing channels. Bridge connector for time separation multiplexing contains high frequency serial adaptive circuit for time separation multiplexing, high speed serial adaptive circuit for receiving time-separation multiplexing and circuit for controlling clock frequency.
EFFECT: increased data transmission capabilities for connecting panel, decreased clock frequency synchronization requirements, and thus substantially increased reliability of system.
2 cl, 14 dwg