SU510770A1

SU510770A1 - Device for demodulating signals with double phase shift keying

Info

Publication number: SU510770A1
Application number: SU1950034A
Authority: SU
Inventors: Виктор Леонидович Банкет; Владимир Николаевич Батраков
Original assignee: Одесский Электротехнический Институт Связи А.С.Попова
Priority date: 1973-07-26
Filing date: 1973-07-26
Publication date: 1976-04-15

Description

1one

Изобретение относитс к электросв зи и может использоватьс в системах приема сигналов с двухкратной фазовой манипул цией (ДФМ).The invention relates to telecommunications and can be used in signal reception systems with double phase shift keying (DPS).

Известно устройство дл демодул ции сигналов с двухкратной фазовой манипул цией, содержащее полосовой фильтр, на вход которого подан фазоманипулированный сигнал, и две бистабильные схемы на выходах устройства .A device for demodulating signals with double phase manipulation is known, which contains a band-pass filter at the input of which a phase-shift keyed signal is applied, and two bistable circuits at the outputs of the device.

Однако известное устройство характеризуетс большими аппаратурными помехами.However, the known device is characterized by large instrumental noise.

Цель изобретени - повышение помехозанишденности устройства по отношению к аппаратурным помехам.The purpose of the invention is to increase the interference of the device with respect to the instrumental interference.

5)то достигаетс тем, что в предлагаемом устройстве на выходе полосового фильтра включена дополнительна бистабильна схема , выходы которой через дополнительные инверторы подключены к соответствуюш,им парам дополнительных схем «И, причем выходы первых схем «И этих пар подключены к входам одной бистабильной схемы, а выходы вторых схем «И этих пар - к входам другой бистабильной схемы, кроме того, к управл юш,им входам двух схем «И различных пар подключены соответствующие выходы дополнительного формировател импульсных коммутационных последовательностей на вход которого и на второй вход дополнительной 5) this is achieved by the fact that in the proposed device an additional bistable circuit is turned on at the output of the band-pass filter, the outputs of which are connected to the corresponding AND pairs of additional circuits through additional inverters, and the outputs of the first circuits And these pairs are connected to the inputs of one bistable circuit, and the outputs of the second circuits “And these pairs - to the inputs of another bistable circuit, in addition, to the controller, to the inputs of two circuits“ And different pairs, the corresponding outputs of the additional pulse-switching device are connected sequences to which the input and the second input of the additional

бистабильной схемы подано опорное когерентное колебание.bistable circuit filed coherent reference oscillation.

На чертеже приведена структурна электрическа схема предлагаемого устройства.The drawing shows a structural electrical circuit of the proposed device.

Устройство дл демодул ции сигналов с ДФ7v1 содержит полосовой фильтр 1, на выходе которого включена дополнительна бистабильна схема 2, выходы которой через дополнительные инверторы 3, 4 подключены к соответствующим парам схем дополнительных «И 5, 6 и 7, 8, причем выходы первых схем «И 5, 7 этих пар подключены к входам бистабильной схемы 9, а выходы вторых схем «И 6, 8 - к входам бистабильной схемы 10, кроме того, к управл ющим входам двух первых схем «И 5, 7 и двух вторых схем «И 6, 8 различных пар подключены соответствующие выходы дополнительного формировател 11 импульсных коммутационных последовательностей . Вход полосового фильтра 1 вл етс входом устройства, выходы бистабильных схем 9, 10 вл ютс выходами устройства .The device for demodulating signals from DF7v1 contains a band-pass filter 1, the output of which includes an additional bistable circuit 2, the outputs of which through additional inverters 3, 4 are connected to the corresponding pairs of circuits of additional "And 5, 6 and 7, 8, and the outputs of the first circuits" And 5, 7 of these pairs are connected to the inputs of the bistable circuit 9, and the outputs of the second circuits "And 6, 8 - to the inputs of the bistable circuit 10, in addition, to the control inputs of the two first circuits" And 5, 7 and two second circuits "And 6, 8 different pairs connected the corresponding outputs of the additional form worldlord 11 pulse switching sequences. The input of the bandpass filter 1 is the input of the device, the outputs of the bistable circuits 9, 10 are the outputs of the device.

Устройство работает следующим образом.The device works as follows.

Claims

For demodulation, the signal from the device from the device enters through the band-pass filter 1 to the century of the additional bistable circuit 2, to the second input of which and to the input of the generator 11 a reference coherent oscillation is simultaneously applied with a period exactly equal to a quarter of the period Hz of the carrier signal with the CPM . The leading edges of the pulses of the reference coherent oscillation coincide with the moments ti and tz of determining the polarity of the FM signal. The imaging unit 11 generates pulse sequences with a frequency equal to the frequency of the carrier oscillation signal with a DFM and with a duty cycle of four, and these sequences are shifted by a quarter of one period relative to the other. The output voltages of the bistable circuit 2, when the additional inverters 3, 4 pass, are converted into a pulse voltage with negative pulses, which carry information about the polarity of the FM signal at the reference times ti and tz. These negative pulses interact with the corresponding output negative pulses of the driver 11 in two pairs of circuits "AND 5, 6 -and 7, 8, resulting in the output pulses of inverters 3, 4 arrive at the corresponding inputs of the bistable circuits 9, 10. At the output of the first circuit" And 5 of one of the pairs there are positive pulses only if the polarity of the input signal at ti is positive, at the output of the second circuit “AND 6 - if negative, at the output of the first circuit“ And 7 of the other pair, if the polarity of the input signal in moments 4 - is positive, at the output of the second circuit “And 8 - is negative. Bistable circuits 9, 10 serve to store decisions on the duration of the period Gn about the polarity of the signal at the output of the bistable circuit.

2. As a result, at the outputs of the device to which the outputs of the bistable circuits 9, 10 are connected, demodulated oscillations of information FMC signals are in effect. Apparatus of the Invention A device for demodulating signals with double phase manipulation, comprising a band-pass filter, at the input of which a phase-shift keyed signal is applied, and two bistable circuits at the outputs of the device, characterized in that, in order to increase the noise immunity with respect to hardware interference, at the output of the bandpass signal the filter included an additional bistable circuit, the outputs of which through additional inverters are connected to the corresponding pairs of additional circuits “And, with the outputs of the first circuits“ And these pairs of Connected to the inputs of one bistable circuit, and the outputs of the second circuits "And these pairs to the inputs of the other bistable circuit, in addition, to the control inputs of the two circuits" And the various pairs are connected to the corresponding outputs of the additional pulse generator switching sequences, to the input of which the second an input of an additional bistable circuit is fed a reference coherent oscillation.