The sealing device channels
(57) Abstract:Usage: telecommunication, communication systems, code compaction and separation channels (signals). Summary of the invention in the known device signaling using quasiorthogonal signals as the reference channel signals arise mutual interference that significantly reduces the noise immunity of information transmission. The sealing device of the channels contains an adder 1, N multiplier products 2, the generator 3 of the reference channel signals, N 4 blocks subtraction, N 5 blocks calculate the correction voltage, N 6 blocks of memory, the generator 7 clock pulses. 1 Il. The invention relates to telecommunication and can be used in communication systems with parallel transmission of information, as well as to seal wired, microwave and satellite communication lines.Goal is to increase the noise immunity of the transmission of information.The drawing shows a structural electric circuit multiplexers.The sealing device of the channels contains an adder 1, N multiplier products 2, the generator 3 of the reference channel signals, N 4 blocks subtraction, N blocks 5 calculating adjustment S="ptx2">The generator 7 generates pulses with a period T, where T is the repetition period information signals. Upon receipt of the next clock pulse read timing signals Cjthe inputs of the sealing device. In N blocks 5 is calculated voltage interference for each compressed signal, taking into account the correlation coefficients, which are stored in N blocks 6 and are read into the corresponding N blocks 5.N blocks of 4 is the dierence between the readings of the information signals Cjand calculated stresses mutual interference for the data samples. The results deduct Commission in each channel are multiplied with the reference channel signals into N 2 multiplier products coming from the generator 3, and are summed in the adder 1. Under counts understood pulses SoWith the next clock pulse cycle of operation of the multiplexers is repeated.It should be emphasized that the effectiveness of the device for the suppression of mutual interference will depend on the RMS values of the correlation coefficients r = . If the mean value from the account of the mutual interference in the j-th channel = Vcr will be less than Vcthen EF is, the inRR> Vcthe efficiency of the device is negative, i.e., after the seal of signal power to interference will not decrease, but will increase as additives in all channels will be given for the j-th channel of mutual interference, but the value is more than compensated for the disturbance.Determine the area of effective use. On the transmission side are a group signal
Xg(t) = CiSi(t) = (Ci+Ci)Si(t)
and at the receiving side in the j-th channel are the reference voltage
Uj= (1/T) Ci+CSi(t)+n(t)JSi(t)dt =
= CjVc+VcCirij+CjVc+Vc.This shows that if signicade critical value of U= Cirijwill be less than the mean importance values U= Cirijthe effectiveness of the proposed device will be high. Since /Ci/ = 1, a sCiC, prirodna RMS values Ujand UItget .This equality allows us to obtain the value r = 1/, where the efficiency of the device is positive, i.e., reduced power interference. It should be noted that effektivnostpukola, i.e., Ci(-1,1). The SEALING DEVICE of CHANNELS, comprising a generator of clock pulses (GTI), connected in series generator reference channel signals of the multiplier products and the adder, the output of which is the output device, the control input of the generator of the reference channel signal is connected to the output of the GTI and is clocked by the output device, characterized in that it introduced serially connected N memory blocks, N units calculating adjustment voltage and N blocks subtraction, N - 1 information inputs which are connected with the first information input of the N - 1 blocks calculate the correction voltage, the N-th input is connected to the information input N block subtraction, in this case, all N information inputs N blocks subtraction are the same input device, the N-th inputs 1 and N-th blocks calculate the correcting voltages are connected, the control inputs of N blocks calculate the correcting voltages are interconnected and connected to the output of the GTI, the outputs of blocks subtraction is connected to other inputs of the respective N multiplier products.
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.