SU720769A1 - Device for handling signals with amplitude-phase modulation - Google Patents

Description

(54) DEVICE FOR PROCESSING SIGNALS WITH AMPLITUDE-PHASE

Modulation

This is connected to the output (First Generator Generator. In this case, the correction signal filter is designed as a multi-drop delay line, to whose outlets the weight adder is connected. 1

The drawing shows a structural layout of the proposed device. The device circuit contains k6 keyboard 6p 1, recognition unit 2, oscillator 3, first demodulator 4, first controlled generator 5, second demodulator 6, low frequency filter 7, analog-to-digital converter 8, correction signal filter 9, multiplier 10, second controlled oscillator 11 ,. element 12 of the rear ryk11i modulator 13. The filter 9 of the correction signal contains a multi-split delay line 14 and a weight adder 15 ,.

The device works as follows. The signal from the communication channel is fed to the input of the second demodulator 6, which is drying; G1 rebrain: the signal is visible in the low-frequency region. Filter 7 low frequency HIGH FREQUENCY. Analog-to-digital converter 8 digitizes the signal to a discrete time of 1 × 1 × 6 –S of the time, determined by the first clock frequency. From the analog output of the converter 8, the signal through the corrector 1 and the first demodulator 4 is fed to the block 2 of the POWERING program, yes the BIDAY (SH – Sh dannogo signal. , BbjsBaHHbiH mutual instability of the generators at the receiving and transmitting stations and other pritany.

The generator of 3 errors from chetyreh shGnalov arriving at its inputs generates two signals. The first signal is for controlling the carrier phase, and the second signal is for controlling the corrector 1 and for adjusting the phase of the clock.

Sigr from the corrector 1 nSef MBTf and fiyr 9 of the signal of the corrector GDS 1 of the filter 9 of the correction signal SIGGay comes to a multiplier 10, where it is multiplied with the first signal of the 3 error generator, delayed by three melts on the delay 12 element. At the output of the breeder 10, a signal is generated that corresponds to the gradient of the criterion of tact. This signal arrives at the second control 1G7gon | rat6p 11, where a signal is formed that corresponds to the moment of reading in the analog-digital converter 8, i.e. the phase of the clock frequency., Filter 9 СИГШ1а кор: рёк1Ш1 ИПШнен as a multi-drop line 14 delay, к

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the taps of which are connected to the weight adder 15. The number of taps of the lateral delay line 14 is sufficient to take 5 or 7. At this weight, the weight adder 15 is proportional to the members of the row yes ... -1/3, 1/2, -1,0 , 1, -1/2, 1/3.

The device performs a joint opti- lization of the carrier oscillation, the phase of the clock sequence and the correction of intersymbol distortions, which leads to the noise immunity of the received signal and increases the speed of information transmission.

Claims (2)

1. Processing device: and signals with amplitude-phase modulation, containing successively connected equalizer, the first demodulator, recognition unit, and error generator, between the first output of the open loop generator and the control input of the first demodulator, the first output generator is connected, the second output of the error generator connected to the control input of the corrector, the output of the first demodulator is connected to the first additional input of the error generator & EC, which is due to the fact that, in order to improve noise immunity, the second demodulator is connected to the input of the corrector, low filter frequency and analog-to-digital converter, between the output of the equalizer and the control input of the analog-digital converter on 1 successively the filter of the correction signal, the multiplier and the second controlled oscillator, between the second generator output o Ibok and other input peremiozhitel included a delay element output to a second equalizer soeDinbn additional input error generator, between the output of the discrimination block and the third auxiliary input generator rtsshbrk included modulator control input coupled to the modulator. the output of the first controlled generator " 2. The device according to claim 1, p tl and h and its that the filter of the correction signal is made in the form of a multi-drop delay line, to whose outlets the weight adder is connected. Sources of information, taken into account in the examination 1. US patent N 3878468, cl. And 04 B 1/10, 1975. - 7-T - -A 1--1 "± - ии 9