Way mutually inverse transmission of binary data in parallel vasarosnameny channels with phase-shift keying on a single carrier frequency minus admission
(57) Abstract:The technical result of the invention is the achievement of a higher noise immunity and reliability discrete binary messages by radio signals with a relative phase shift keying without increasing the transmitter power, transmission time and bandwidth. This goal is achieved by the fact that the transmitter and the receiver are formed two concurrent vasarosnameny parallel channel on the same carrier frequency. The transmitted binary messages are mutually inverse on these two channels by a specific method relative phase manipulation. And forming the resulting received signal and the selection of the interference is carried out by subtracting one from the other inverted between the information symbols received on these two vasarosnameny channels. This increases the level of the resultant received signal and reducing noise. 1 Il. The new proposed method mutually inverse transmission of binary data in parallel vasarosnameny channels with phase-shift keying on a single carrier frequency with mutual subtraction when receiving the received inverse ELEH the data lines, working with photomanipulating signals, and first and foremost with a relative phase shift keying (there), also called phase difference modulation (MDF) or relative phase telegraphy (oft) (although it is possible to work with a normal phase manipulation - FM).The purpose of this invention is the achievement of a higher noise immunity and reliability of the transmission of discrete binary message signals in the first place there without increasing the occupied bandwidth, transmission time, and without increasing the transmitter power.This goal is achieved by the fact that the transmitting device are formed two concurrent vasarosnameny parallel channel on the same carrier frequency. The transmitted discrete binary messages are mutually inverse to each other according to these two vasarosnameny channels special methods relative phase manipulation. And forming the resulting received information message and its isolation from interference in the receiving device is carried out by subtracting one from the other individual received two vasarosnameny channels two inverted between the information signals (symbols). This produced the anti-shudder performance interference due to their mutual subtraction, that is, there is an increase in the signal-to-noise ratio at the output of the receiver, therefore, increase the robustness and fidelity of the transmission of the message.Possible scheme for implementing the new proposed method of transmitting and receiving binary information in the inverse form two parallel vasarosnameny channels on the same carrier frequency, shown in the drawing. She works as follows. From information source 1 is transmitted binary message, for example, 101101 is supplied to the inverter 2, in which the message is converted to the inverse 010010. These two messages are transmitted on two vasarosnameny channels, for example the first (direct) 101101 on the first (in-phase) channel and the second inverse 010010 on the second (quadrature) channel. To do this, both of these reports are transmitted to the control unit 3 unit 4 phasers carrying out the phase shift of the carrier frequency -45orelative to the phase of the previous elementary parcel, and block 5 phasers carrying out the phase shift of the carrier frequency at +135orelative to the phase of the previous parcel. The carrier frequency is supplied from a generator carrier frequency 6. The management phase is, for example, that they vluu and inverse (i.e., first and second) channels, i.e. one of the blocks of phasers is enabled, and the second switched off (for example, using electronic keys) in accordance with the transmitted binary combination of information on direct and inverse (i.e. first and second) channels. Set the following line: when sending a combination of 1; 0 by the first and second channels (i.e., simultaneously transmitted symbols 1 on the first channel and 0 on the second channel) is the phase shift of -45oi.e. does the block phase shifter 4, and when the transmission combinations 0; 1 according to the first and second channels is set to the phase shift at +135oC, i.e., the working unit of the phase shifter 5. This is a special kind of relative phase manipulation and formed two vasarosnameny channel. The peculiarity and novelty of this species relative phase manipulation is that it is not an ordinary one there, because in this case are formed and used two vasarosnameny channel, not the channel as one there; but at the same time, in this case it is not a classic two-time there as possible for the classical two-there character combinations 1; 1 and 0; 0 by the first and second channels are newsage manipulator in comparison, for example, with two there, because the proposed method uses four values of the phase increment, but only two. Once again, I note that the required phase increment, i.e., phase shifts, -45oor +135oshould be relative to previous assumptions, and therefore requires not only one such phase shifter, and a unit that performs the operation. The entire transmitting device is synchronized with the clock of clock pulses 7. Output from the transmitting device photomanipulating thus the signal in the channel or the communication line 8, i.e. in the distribution environment (and possibly storage) information, where the signal is affected by interference from a noise source 9.After passing through the communication channel signal gets to the receiver unit. After passing through the main reception path 10, where the signal is amplified and emitted from interference by side and adjacent channels, the signal branches three branches and two branches of them comes in two separate phase detector 11 and 12 two vasarosnameny channels. In these phase detectors and the separation of the two vasarosnameny channel and the separation channel signals.On the third branch of Lerici 13, where is the delay of the received signal on the duration of elementary parcel Tpand then after amplification in the amplifier 14 is a voltage used as a reference for the first photoresponse channel and fed to the first phase detector 11. The second phase detector 12 of the second photoresponse channel reference voltage is shifted 90oafter passing through the phase shifter 15. In the phase detectors is the separation of the two used posted on phase parallel channels.'ll prove it. Indeed, predetection output voltage UC. o.phase detector (PD) in the case of a large level of the reference voltage is determined by the formula /HP 1/
UC. o.= 2UM. S.Kdcos,
where UM. S.the voltage amplitude of the signal received at the input FD;
Kd- transfer coefficient of the diode detector;
is the phase angle between the received and reference signals.When transmitting symbol (i.e., parcels) 1 according to the first vasarosnameny channel and simultaneous transmission of the symbol 0 on the second vasarosnameny channel in the transmitter sets the phase shift of the signal at -45orelative to previous ponovo in PD-1 (11) and -135oi.e. modulo 135orelative to the reference voltage for PD-2 (12), since the phase of the received signal and the reference voltage of the second (quadrature) channel shifted in different directions, respectively -45oand +90orelative to the reference voltage of the first channel.Therefore, the output of the FD-1 (11) when(11)= -45get a positive output voltage corresponding to symbol 1:
< / BR>and the output FD-2 (12) when(21)= -135will provide a negative output voltage corresponding to the symbol 0:
< / BR>Similarly, one can show that the transmission of the combination of the symbols 0, 1 by the first and second vasarosnameny channels respectively so they will be accepted in the receiver. Indeed, when transmitting the combination of the symbols 0, 1 phase high frequency signal transmitter is shifted by +135orelative to its previous high-frequency package. This means that now the received signal will be shifted in phase by +135orelative to the reference voltage at FD-1 (11) (as used as a reference voltage of the previous packages, delayed in delay line 13) and the received signal is shifted in phase what about the channel shifted in phase by +90orelative to the reference voltage of the first channel).Therefore, in this case, the output FD-1 (11) when(10)= +135will provide a negative output voltage corresponding to the symbol 0:
< / BR>and the output FD-2 (12) when(20)= +45get a positive output voltage corresponding to symbol 1:
< / BR>Thus, the channels are separated, and the information transmitted is held in the corresponding channel, and the transfer of mutually inverse characters (i.e., elements of the binary data 1 and 0) for two vasarosnameny channels on the channel outputs of the phase detectors 11 and 12 receive proyektirovaniye signals of opposite polarity, i.e., mutually inverse videospussy.With the two outputs of the phase detectors PD-1 (11) and PD 2 (12) proyektirovaniye signals of opposite polarity together with noise applied to subtractive device 16, in which the mutual subtraction inverse signals (videokursov) the received signal is theoretically increases in 2 times, and additive amplitude noise ratio, which is equally and in the same polarity passes through both of FD, offset, suppressed, in accordance with viruses device received signals (videospussy) are fed to the pulse shaper binary signals 17, which may include the clock generator. From the output of the shaper pulse generated binary signals good form is received by the receiver 18.Let us now consider the effect of interference affecting the phase of the received signal. Here it is necessary to consider different cases. First, if arising out of interference with an additional phase shift of the received signal relative to the previous frequency of the parcel, the voltage which is used as a reference, does not exceed the module 45othe effect of such interference does not change the polarities of the output voltage channel of the phase detectors PD-1 (11) and PD 2 (12), i.e. they will remain raznoporodnye opposite polarity. And given the fact that one output voltage PD is subtracted from the other, will get that in this case the interference is largely compensated suppressed. Secondly, when noise and interference variances of the signal phase angle within the module 45oto 135oyou can change the polarity of the video impulse at the output of one of the phase detectors, i.e., any error in the admission of elementary information of the parcel in one of two vasarosnameny channels is perseroan in subtractive device in communication with the when such phase deviation level correctly received signal at the output of the phase detector of the corresponding channel will greatly exceed the level of incorrectly received signal at the output of the other phase detector of the second channel. In addition, these possible errors associated with changes in the polarity of the video impulse at the output one, any two, phase detector, can be detected when possible inclusion in this receiving device additional device detect possible errors and quality control of the communication channel (i.e., control signal-to-noise ratio), which (additional device) can be used in schema matching 19 governing unipolar pulses (same polarity) outputs FD-1 and FD-2, that talks about the harmful error and about the poor quality of the communication channel (i.e., about the poor signal-to-interference), as well as the count of these possible errors 20. Finally, in the third place, when large deviations in the phase of the signal due to interference from 135oand more than 180o(by module) there will be a change in the polarity of videokursov on the outputs of both PD in two channels. In this case you will get an invalid, erroneous reception. But such deep discard the /L 2, C. 411-415/.Thus, in General, the new proposed method mutually inverse transmission of binary data in parallel vasarosnameny channels subtraction admission can greatly reduce the effect of interference, to improve the noise immunity and reliability of the communication system or, on the other hand, when the same noise immunity of the communication system to reduce the level of the signal to reduce radiated and power consumption and to improve the environmental performance of the system.Sources of information
L. 1. A receiving device. Edited by Syko A. G.-M.: Communication, 1975. - 400 C. /sec. 214/.L. 2. Levin, B. R. theory of random processes and its applications in radio engineering. - M.: Owls. radio, 1960. - 663 S. /S. 411 - 415/. Way mutually inverse transmission of binary data in parallel vasarosnameny channels with phase-shift keying on a single carrier frequency minus admission, namely, that of the transmitting and receiving devices are formed two concurrent parallel vasarosnameny quadrature channel on the same carrier frequency, organized so that the vectors of the reference voltages of the receiver channels are phase angles in absolute value 45 and 135owith vector napaba on these two vasarosnameny channels by the method of relative phase manipulation, uses only two combinations (1,0; 0,1) at respective phase angles, and forming the resulting information signal and its isolation from interference in the receiver is performed by subtracting one from the other received on the two channels of the two inverted between the information 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