SU545048A1 - Two-channel device for transmitting and receiving signals with phase shift keying - Google Patents

Description

one

The invention relates to communication technology.

A two-channel device for interfering and receiving signals with phase manipulation is known, containing its in-phase and quadrature channels, each of which consists of a phase detector, a storage unit and a multiplier voltage, a summation unit and a unit for generating reference oscillations, and between the device input and the inputs Interchangeables Ianr Zhepy introduced a switched switched filter 1.

This two-channel device does not have high noise immunity.

It is also known a two-channel transmission device and a signal generator with phase maiipul that contains a generator on the transmitting side, whose output is connected to the corresponding manipulators through frequency multipliers and the receiving units in each channel on the receiving side, the phase detector on the main mixer connected through the multiplier to the reference input of the phase detector 2.

However, such a device does not provide high noise immunity.

The purpose of the invention is to improve noise immunity.

For this purpose, in a two-drop device for transmitting and receiving signals with phase shift, containing pa the transmitting side

the master oscillator, whose output is connected to the corresponding manipulators via frequency multipliers, and the receiving side — the block selector in each channel, the phase detector and the main mixer, is connected through the multiplier to the reference input of the phase detector; an additional mixer and an adder are input on the input side . The control inputs of the manipulators are combined and are the input i of the device, the outputs of the selection block of the coupling with the corresponding inputs of the main mixer, and the output of one selection block directly and the output of the second selection block through the additional mixer. With the inputs of the adder detector, the output of which hh hsts device output, and the second input of the mixer is connected to the output of the main mixer.

The drawing shows a structural diagram of a two-channel device.

A two-channel transmission device and an Irpema sigpal with phase manila cis contains the transmitting side 1 of the driver setting 2, which is output through frequency 3 and 4 connected to the corresponding mappulators 5 and 6, whose control inputs are combined and are the input ycTpoii, and on the ir side 7, selection blocks 8 and 9 in each channel, phase detector 10, main mixer 11 connected via multiplier 12 to the reference input of phase detector 10, additional mixer 13 and adder 14. The outputs of selection blocks 8 and 9 are connected with the corresponding inputs of the main mixer 11, and the output of the block 8 indirectly and the output of the block 9 through the additional mixer 13 - with the inputs of the adder 14, the output connected to the input of the phase detector 10, the output of which is the output of the device, and the second input of the mixer 13 is connected to the output of the main mixer 11.

The device works as follows.

The master oscillator 2 generates a frequency oscillation co. The frequency of these oscillations is multiplied by multipliers of frequency 3 and 4 by the integer coefficients 2y and 2 / g + 1, respectively (the coefficients choose two adjacent numbers, one of which is always even, the other is Odd). The carrier oscillations are manipulated by the manipulators 5 and 6 and receive the same phase shifts when manipulating.

The manipulated signals through the communication line arrive at the inputs of the selection blocks 8 and 9 and are filtered out. Since the phase shifts of the carrier frequencies are the same, their difference frequency w does not contain manipulation. This frequency is allocated by mixer 11 and through a multiplier 12 frequencies with a multiplication factor Ik is fed to the reference input of the phase detector 10.

The spectrum of the signal on the output of the selection unit 9 differs from the spectrum of the signal at the output of the selection unit 8 only by a shift by the frequency co. Using as the local oscillator frequency the output signal of the main mixer 11,

additional mixer 13 converts the spectrum of the signal at the output of the selection unit 9. Adder 14 combines the output signals from block 8 and mixer 13, thereby increasing the signal-to-noise ratio at the input of the phase detector. The combined signal is detected by a phase detector.

Claims (2)

1.Avt. St. No. 323868, cl. H 04L 27/18, 1969. 2. Avt. St. L 319101, cl. H 04L 27/18, 1970 (prototy). .I