Device for transmitting and receiving signals
FIELD: automatic data acquisition systems.
SUBSTANCE: proposed method designed for data acquisition from burglar and fire alarm sensors, electricity, heat, and gas meters, and from fiscal memory of cash registers involves use of unique random or pseudorandom plurality of differences in initial phases of closest harmonic pairs, mentioned plurality being chosen so as to minimize peak factor of total signal. In case of operation of fire alarm sensor it is sufficient to transfer only one character to alarm control console unambiguously identifying location of operating sensor; as a rule, such character is conditional number or address pre-assigned to sensor.
EFFECT: reduced power requirement of subordinate system units and/or enhanced range of their operation.
1 cl, 2 dwg
FIELD: radio engineering; portable composite phase-keyed signal receivers.
SUBSTANCE: proposed receiver has multiplier 4, band filter 6, demodulator 8, weighting coefficient unit 5, adding unit 7, analyzing and control unit 10, synchronizing unit 3, n pseudorandom sequence generators 21 through 2n, decoder 1, and switch unit 9. Receiver also has narrow-band noise suppression unit made in the form of transversal filter. Novelty is that this unit is transferred to correlator reference signal channel, reference signal being stationary periodic signal acting in absence of noise and having unmodulated harmonic components that can be rejected by filters of simpler design than those used for rejecting frequency band of input signal and noise mixture. Group of synchronized pseudorandom sequence generators used instead of delay line does not need in-service tuning.
EFFECT: facilitated realization of narrow-band noise suppression unit; simplified design of rejection filters.
1 cl, 8 dwg
FIELD: radio engineering, applicable in antiference radiolinks.
SUBSTANCE: the method is featured by the fact that the pseudorandom sequence with clock pulse fp and for expansion of the spectrum is divided into two orthogonal sequences, one of which contains only even harmonics of the initial pseudorandom sequence, and the other - only the odd ones, then each of the obtained sequence is multiplied with a simple phase-manipulated signal, then the upper side band is separated from the spectrum of one obtained signal, and the lower side band - from the spectrum of the other signal, these unlike side bands are summed up, in each side band two narrow sections of the spectrum symmetrical relative to frequency f0+1/2fp, in the upper side band and relative to frequency f0-1/2fp in the lower side band, one of the separated sections of the spectrum in each side band of the separated spectrum sections is amplified to the known magnitude, and the other, symmetrical to it, is inverted, after which the separated and remained non-separated sections of the spectrum in both side bands are summed up, the separated narrow spectrum sections in each side band are altered according to the pseudorandom law.
EFFECT: enhanced anti-interference of the radiolink is attained due to the fact that in the method of normalization of the composite phase-manipulated signal consists in expansion of the spectrum of the simple phase-manipulated signal obtained by multiplication of the carrying sinusoidal oscillation with frequency f0 and the binary information signal.
FIELD: radio engineering.
SUBSTANCE: device implements algorithms of discontinuous Fourier transformation and fast folding of received and bearing signals, to provide search-less detection of complicated signals with sizeable bases. Digital synchronized filter processes at video-frequency with use of standard digital assemblies and elements. Device has multipliers 3,4,14,15, phase changer 2 for π/2, circuit for delay for length of signal element 1, low frequency filters 5,6, analog-digital converters 7,8,12, microprocessor systems of discontinuous Fourier transformation 9,10, microprocessor systems of reversed discontinuous Fourier transformation 16,17, generator of bearing pseudo-random series 11, microprocessor systems of discontinuous Fourier transformation of bearing pseudo-random series 13, square-ware generators 18,19, adder 20, arithmetic device for taking square root 21, threshold device 22, discontinuous process pulse generator 23, device for splitting frequency in two 24, clock generator 25, interconnected by appropriate functional connections.
EFFECT: broader functional capabilities, higher efficiency.
FIELD: radio engineering.
SUBSTANCE: device, having bearing oscillation generator, output of which is connected to signal input of first key and to input of first phase shifter, output of which is connected to signal input of second key, outputs of first and second keys are connected to appropriate inputs of adder, output of which through multiplier is connected to output of device, device additionally has pseudo-random series generator, clock input of which is connected to output of clock pulse generator, and synchronization input is connected to output of synchronization pulse generator and to second synchronization means input, first input of which is input of information signal, and output is connected to second multiplier input, device also includes commutation block, M decoders, M-2 keys, M-2 phase shifters, pseudo-random series delays block.
EFFECT: better concealment and detection protection level of generated signal.
FIELD: radio engineering.
SUBSTANCE: known digital device for demodulation of discontinuous signals in multi-beam communication channel, having block for transformation of input signal, solving circuit, shift register and demodulation block, consisting of N serially connected detection blocks and N-input adder, additionally has (M-1) demodulation blocks and M-input adder, and in each of N blocks for detecting each of M demodulation blocks, additionally inserted are power measuring device and device for forming weight coefficient.
EFFECT: higher resistance of receipt to interference and compatibility of device with multi-position signals receipt.
FIELD: technology for recognizing radio-signals, in particular, methods for detecting type and modulation parameters of radio signals.
SUBSTANCE: for realization of method during recognition received radio signal is digitized by time and quantized by level. Value of bearing and clock frequencies of signal are determined and cophased and quadrature components of radio signal are formed. These are then filtered and selection counts of cophased and quadrature components of radio signal are selected, taken in counting time moments, determined by value of clock frequency. After that, selection counts of cophased and quadrature components of radio signal are corrected in complex form, using gradient algorithm for adjusting corrector coefficients. Then estimate of selections is split onto given number of clusters, equal to position coefficient of recognized signals, and values of clusterization error functional are calculated, received values are compared and decision is taken about relation to class by minimum of error functional value.
EFFECT: increased probability of correct recognition under multi-beam conditions.
5 cl, 9 dwg
FIELD: modulation and demodulation in reception and transmission including when using expanded signal spectrum.
SUBSTANCE: proposed method for digital communications with signal whose spectrum is expanded by modulation using complementary Golay numbers involves following procedures: during transmission input binary data are integrated into η groups of m = log2A bits, A modulation by peak values, spectrum expansion by means of η complementary Golay numbers or by complementary Golay numbers whose phase and sign are changed, modulation in N-phase keying mode, and transmission over communication channel; reception involves phase demodulation, convolution with respective Golay complementary numbers, amplitude demodulation, and source data generation.
EFFECT: enhanced transfer speed and spectrum expansion ratio.
7 cl, 4 dwg
FIELD: radio engineering, possible use in radiolocation stations for allowing phase-code manipulated signals with approximately equal frequencies.
SUBSTANCE: input signal of device is an additive mixture of video-frequency phase-code manipulated signals with varying amplitudes and delays, encoded by M-series, digitized with temp in two counts on elementary analog quantization step in strobe M=4·n-1. By means of first adder and first shift register input signal by its recirculation amounts to interval, equal to 2·n. By means of first commutator signal is divided on even and odd series, which in turns pass to block of cross connections, then to block of fast Walsh transformation, and further to block of reverse check connections and second commutator. From the latter signals are sent to block for synchronization with elementary quantization step two counts long. Further signals are sent to third commutator, which in accordance to its evenness and oddness order sends them to second adder. By means of second adder and second shift register, signal from third commutator by its recirculation amounts to interval, equal to 2·n.
EFFECT: substantially decreased computer power costs due to recirculation transformation of input signals, making it possible to apply fast Walsh transformation.
3 cl, 8 cl
FIELD: data transmission.
SUBSTANCE: methods are claimed for processing data transmission in transmitter and receiver using native channel decomposition, channel inversion. In the transmitter, native decomposition of channel is performed to determine native modes of 3G network channel and to produce first set of control vectors; channel inversion is performed to produce weight coefficients, for example, one set for each native mode, used to minimize distortions introduced by inter-symbol interference, scaling values are produced, which characterize powers of transmission, distributed across native modes, where first set of control vectors, weight coefficients and scaling values are used to produce an impulse generation matrix, which is used for preliminary reduction of modulation symbols to meet required conditions before the transmission. In the receiver, native decomposition of channel is performed to produce second set of control vectors, which are used to produce an impulse generation matrix, used to reduce received symbols to meet required conditions in such a way, that orthogonal symbol streams are restored.
EFFECT: ensured high traffic capacity.
12 cl, 10 dwg