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.

 

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