SU917333A1 - Digital relative phase-modulated signal demodulator - Google Patents

Description

(54) DIGITAL DEMODULATOR SIGNALS

RELATIVE PHASE MANIPULATION

The invention relates to a communication technique and can be used on the day of demodulation of signals of relative phase-wise manipulation in the transmission channels of an information signal. A device is known that includes a pulse generator, a frequency depot, a clock synchronization unit, a control pulse driver, an AND element and a matching unit 13. A device that demodulates relative signals is also a disadvantage of this device. phase manipulation consisting of a pulse generator, the output of which is connected to the input of a frequency divider, a clock synchronization unit, a control pulse shaper, an And element and a coincidence unit 12. N sufficiency of this device is also in a low noise immunity. The purpose of the invention is to increase the noise immunity of the demodulator. The goal is achieved by the fact that a digital demodulator of relative phase shift keying signals, comprising a pulse generator, the output of which is connected to the input of a frequency divider, a clock synchronization unit, a control pulse driver, an AND element and a coincidence unit, a correlation signal generation unit is added, ring shift register and shaper input signal, and the clock synchronization block input is connected to the ES bus and to the input shaper input signal whose output is dinene with the first inputs of the formation block. a signal of a control pulse and a control pulse blocker, the second input of which is connected to the first input of the And element and the first output of the clock synchronization unit, the second output of which is connected to the second input of the correlation signal generation unit whose output ct is the same as the second input of the control pulse generator whose shlsod is connected to the first input ring-shaped shift register n with the second input A ring-shaped shift register, the outputs of which are connected to the corresponding information inputs of which by coincidence, the outputs of which are connected to the corresponding output shells. FIG. 1 shows a block diagram of a digital demodulator of relative phase shift keying signals; in fig. 2 - time diagrams that show his work. The device contains a generator of 1 pulses, the output of which is connected to the first input of frequency divider 2, the second input of which is connected to the output of the driver 3 of the control pulse and to the input of the ring shift register 4, the second input of which is connected to the output of element 5 And, the first input of which connected to the output of the divider 2, and the second to the first input of the block b matches and to the first output of the b "eye 7 clock synchronization, the input of which is connected to the i input bus and to the input of the imager 8 of the input signal whose output is connected to the first input signal generating unit 9, a correlation shaper 3 and the second input unit 6 matches. The outputs of register 4 are connected to the corresponding inputs of block 6 coincidences, and its outputs are connected to output faults. The second output of the clock synchronization unit 7 is connected to the second input of the correlation signal generating unit 9, the output of which is connected to the second input of the driver 3 of the control pulse. The demodulator works as follows. A sinusoidal signal (Fig. 2a) is fed to the inputs of the driver 8 of the input terminal and the block 7. Clock synchronization. The driver generates a pulse sequence in phase with the input signal (Fig. 26). The clock synchronization unit 7 generates the synchronization signals necessary for the normal operation of the demodulator (Fig. 2c, d, e). Upon receipt of the synchronous signal (4fflr. 2 g), the probability of the prasyl reception of the useful signal, where ifn is an integer number of input signal periods, during which the estimated parameters reach values sufficient for the determination of the spread decision by the correlation signal generation unit 9. The latter generates a signal (Fig. 2e) before the next impulse of the useful signal arrives at the control EKOD of the driver of the control. 3 a control pulse is outputted at the output of which a synchronizer divider 2 frequencies and a discharge register 4 is output. input signal, as evidenced by the presence of a clock frequency pulse (Fig. 2c), with the second output of the clock synchronization unit 7, a synchronization signal (Fig. 2e) is received at the second input of element 5 I and the first input of the coincidence block 6. From the output of the divider 2 through the element 5 and the clock input of the ring shift register 4 receives a signal with a frequency of 11 5 carried - the number of phase gradations in the input signal, c5s - the frequency of the carrier of the input signal. Wherein. the appearance of a pulse, Bbt signal of the first element And the block of 6 matches corresponds to a change in the phase of the current received signal from the previous one at an angle: d 11 n at the output of the second element And corresponds to: at the output of the nth element And corresponds to: ftW., “Thus, the appearance of a pulsed signal at the outputs of certain elements and block 6 of coincidence corresponds to the number of certain phase movements in the neighboring premises of the phase-mapped signal. The technical implementation of the correlation signal generating unit can be in the idea of a ycTpolfcTBa measuring the adjacent input-pulse sequence, followed by comparing these periods and issuing a resolution signal in the sequence of periods of the input impulse sequence or the discontinuity signal in the case of a mismatch, the introduction of the resolution signal in the case of their mismatch, the introduction of the impulse signal in the event of a mismatch, the introduction of a resolution signal in the case of a mismatch, the output signal of the output signal in the event of a mismatch, Introduction correlation signal shaping greatly improves noise immunity

device aa account - eliminate false sync ..

Invention Formula t. S

A digital signal modulator that applies phase shift keying containing. The pulse pulse, whose output is connected to the input of a frequency divider, a clock synchronization block, a control pulse shaper, an And element and a coincidence block, characterized in that, in order to improve noise immunity, a ring shear formation unit 15 is additionally introduced into it. the register to the input driver, the input of the clock synchronization unit connected to the input bus and to the input driver of the input signal 20, the output of which is connected to the first inputs of the signal conditioning unit a correlation pulse shaper and sovpapeny control unit, the second

the input of which is connected to the first EKODOM of the element I and to the first slot of the clock synchronization unit, the output of which is connected to the second input of the correlation section generation unit whose output is connected to the second input of the control pulse changer, the output of which is connected to the secondary ring of the SHIFT) register and enfOfOJM input frequency divider, the output of which is connected to the second input of the element And the output KOTopoiX} is connected to the second input of the ring shear reputra, outputs. which are connected to the corresponding information inputs of the coincidence unit, the outputs of which are connected to the corresponding output buses.

Sources of information taken into account when expelling

1. USSR Author's Certificate Co 467463 N OZ K 13/20 18.12.72.

2. USSR author's certificate No. 603118 H 03 K 13/20, 15.04.76 Xprotype).

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Claims (1)

Formula 5 A digital signal demodulator, relative phase shift keying, comprising a pulse generator, the output of which is connected to the input of a frequency divider, a clock synchronization unit U, a control pulse shaper, an I element, and a coincidence unit, characterized in that, with an noise immunity circuit, a block is additionally introduced into it 15 the formation of the correlation signal, an annular shift register and the driver of the input signal, and the input of the clock synchronization unit is connected to the input bus and to the input of the input driver 20 s a needle whose output is connected to the first inputs of the correlation signal generating unit, a control pulse shaper and a coincidence unit, the second input of which is connected to the first input of the Ins element by the first output of the clock synchronization unit, the second output of which is connected to the second input of the correlation signal generating unit, the output of which is connected with the second input of the control pulse shaper, the output of which is connected to the first input of the annular shift register and with the second input of the frequency divider, the output of which is connected n with the second input of the element And, the output of which is connected to the second input of the annular shift register, the outputs. which are connected to the corresponding information inputs of the coincidence unit, the outputs of which are connected to the corresponding output buses.