The receiver majority compacted signals with parity
(57) Abstract:The invention relates to computing and communications. Its use in multichannel systems transmit digital information can improve the accuracy of reception of the information by correcting single errors detected. The receiver contains N + 1 correlators 1 (N is the number of aggregated signals), N + 1 critical blocks 2, the generator channel signals 3, a multiplier 4 and the block of the even parity 5. With the introduction of the shift register 6, a key element 7, the pulse counter 8 and the N processing units 9 in the receiver is determined by the beat on which the error occurred, and the channel, where it happened, then correction of this error. 1 C.p. f-crystals, 2 Il. The invention relates to computing and communication and can be used in multichannel systems transmit digital information.Known receiver majority compacted signals (ICC), which administers the decoding and separation.However, this receiver has, ceteris paribus, low reliability, because even a single error occurring in the transmission channel of the ICC, leads to the separation process errors compacted signals, allows you to identify any emerging odd errors, and containing N correlators, N computing units and generator channel signals, and the first inputs of correlators connected to the outputs of the generator channel signals, the second inputs of the correlators are connected, and the outputs of the correlators are connected to the inputs of the corresponding decision signals, in addition, put a block error detection and connected in series multiplier, additional correlator and more decisive block, the output of which is connected to the first input of the error detection, the remaining N input of which is connected to the output of the corresponding N computing units, the second input of the correlator is connected to the combined inputs of N correlators, and the inputs of the multiplier are connected to the outputs of the generator channel signals.The disadvantages of this device is the inability to correct detected errors.The purpose of this invention is to improve the reliability of reception of the information by correcting single errors detected.In Fig.1 shows a structural circuit diagram of the receiver majority compacted signals with a check for the free period 1, N+1 critical blocks 2, the generator channel signals 3, a multiplier 4, block parity 5, the shift register 6, a key element 7, the pulse counter 8, N processing units 9.The processing unit 9 includes accumulating adder modulo two 10, the first pulse counter 11, the first key element 12, a second pulse counter 13, the second key element 14, the shift register 15 and a controlled inverter 16.The device operates as follows.On the transmission side before the operation of the majority seal a sequence of M binary information symbols in each of the N channels is complemented (M+1)-th symbol of the even parity so that the sum modulo two of all M+1 characters was equal to "0". Receiver after the split operation channels on each step detects the presence of errors is odd difference in the set of characters contained in the N channels.In case there are errors in any of the N channels, the output of block parity 5 is formed by the symbol "1", otherwise a "0".The channel in which the error occurred is determined in the processing unit 9 by testing in each of the N channels of the array of M+1 incoming characters on parity. There ghadi N+1 correlators 1, of which N correlators to process information symbols and (N+1)-th correlator is optional. On the second inputs of the N correlators 1 serving channel signals from generator channel signals 3. To the second input of the (N+1)-th correlator 1 is the signal resulting from the multiplication of the channel signals. The multiplication operation is performed in the multiplier 4. Output computing unit 2 in each of the N+1 parallel processing channels is formed by the symbol "1", if the signal at the output of the corresponding correlator 1 positive polarity, or the symbol "0" in the opposite case. In block 5 is the sum modulo two signals from the output of all (N+1)-th computing blocks.If there are errors in the odd number of the N information channels, the resulting sum will be equal to "1", if no error is "0". From the output of the block parity 5 signal is supplied to the shift register 6, performing a delay of a (M+1) tact required for synchronous operation of the processing unit 9. The counter 8 provides an account of incoming characters to the value of M and (M+1)-th also delivers a control signal to the second input of the key member 7 to the first input of which receives signals from the output of the register digallate correlation of single errors, occur in the majority compressed signal during its transmission over the communication channel and division. The information signal output from each of the N computing units 2 respectively supplied to the first input processing 9, where in parallel as it is input to the first 11 and second 13 meters, and the first inputs of the accumulating adder modulo two 10 and a key element 12. The adder 10 performs the summation modulo two blocks of M+1 received at its first input symbols, (M+1)-th of which is a check symbol. The result of the sum ("1" or "0") according to the output signal of the counter 11, performing account up to M+1 and after issuing a control signal to the second input of accumulating adder 10, enters the first inlet 14, in which the input signal ("1" or "0") output 7. The counter 13 performs the expense of incoming characters to the value of M and (M+1)-th stage delivers the control signal to the second input of the key element 12, by removing (M+1)-th step of the signal from further processing. The shift register 15 provides a delay on the M+1st time required for synchronous operation controlled inverter 16, at the first input of which receives the delayed signal from the output of the shift register 15. On vtoroe the symbol "1", the controlled inverter changes the information symbol ("1" or "0") on the opposite, thereby performing correction of errors in a given channel in a given quantum. If the outputs of the core element 14 corresponds to the symbol "0", then managed the inverter does not change the state of the input signal in a given quantum.Thus, the proposed receiver majority compacted signals with parity provides the definition of the measure which the error occurred, specifies the channel where the error occurred, and performs the correction of single errors. 1. The RECEIVER MAJORITY COMPACTED SIGNALS WITH PARITY, containing the first - (N + 1)-th correlators (N is the number of aggregated signals), the first inputs of which are combined and the input of the receiver, generator channel signals, the first to N-th inputs of which are connected to second inputs respectively of the first to N-th correlators and the first to N-th inputs of the multiplier, the output of which is connected to the second input of the (N + 1)-th correlator, the output of each correlator is connected to the input of the eponymous final block, block parity, characterized in that, to improve the reliability of data reception by fixing Omni - The N-th processing units, the output of each of the first to N-th computing units connected to the first input of the same processing unit and a corresponding input power parity, the output (N + 1)-th of the decision making unit is connected to the (N + 1)-th input unit of parity, the output of which is connected to the input of the shift register, the output of which is connected to the information input key element and the input of the pulse counter, the output of which is connected with the control input of the key element, the output of which is connected to the second inputs of the first to N-th processing units, the outputs are the same outputs of the receiver.2. The receiver under item 1, characterized in that the processing unit contains the accumulating adder modulo two, the first and second core elements, the shift register controlled inverter, the first and second counters, inputs are combined with the information input of the first key element and the first input of the modulo two and are the first input unit, the outputs of the first and second pulse counters connected respectively to the control input of the first key element and the second input of the modulo two, the outputs are connected respectively to the input register add the waters of the shift register and the second key element is connected respectively to the information and the control inputs of the controlled inverter, the output which is the output of the block.
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.