SU915276A1 - Device for receiving relative phase modulated signals - Google Patents

Description

The invention relates to telecommunications and can be used to receive signals' with a relative phase modulation (FM) and the minimum phase difference between adjacent premises is not equal to zero.

A device for receiving signals with relative phase modulation is known, comprising a coherent voltage shaper connected in series, a phase manipulator, a phase detector, another input of which is connected to a coherent voltage shaper input, a regenerator and a code converter, other inputs of a regenerator and a code converter are connected to the output of a clock extraction unit frequencies whose inputs are connected respectively to the input and output of the coherent voltage driver (one).

However, the known device has insufficient reliability when receiving signals with a rotating phase.

2

The purpose of the invention is to increase reliability when receiving signals from a rotating phase.

This goal is achieved by the fact that the device for receiving signals with relative phase modulation, containing serially connected shaper reference coherent voltage, phase manipulator, phase detector, another input which is connected to the input shaper reference coherent voltage, regenerator and code converter, other inputs of the regenerator and the code converter is connected to the output of the clock selection block, the inputs of which are connected respectively to the input and output of the driver shaper coherent voltage, an input unit for rotation of the phase of the reference coherent voltage, containing connected in series units of comparison, decryption and integration, the control inputs of which are 215276

connected to the control unit, the inputs of which are connected respectively to the outputs of the coherent voltage driver and the clock selection block, while the other inputs of the comparator are connected respectively to the input and output of the coherent voltage driver and the output of the phase manipulator, the other input of which is connected to the output of the unit integration.

The drawing shows a structural electrical circuit of the device.

• The device contains a driver

1 coherent reference voltage, ’unit 2 of rotation of the phase of the reference coherent voltage, clock selection block 3, phase manipulator 4, phase detector 5, regenerator 6, code converter 7. Block

2, the phase rotation of the reference coherent voltage consists of a comparison unit 8, a decryption unit 9, an integration unit 10, a control unit 11.

The device works as follows.

Phase-modulated with the phase difference between links equal to 90 or 270 ", enters the device input. The control unit 11 of the phase rotation unit of the reference coherent voltage forms measurement intervals with a duration equal to N periods of the carrier frequency and coinciding in phase with the middle of the received FM signal. In the block 8 comparison of the unit 2 of the phase rotation of the reference coherent voltage during the measurement interval compares the phase of the FM signal with the phase of the reference coherent voltage at the output of the phase manipulator 4. The result is the equalization, expressed in digital form, is decrypted by the decryption unit 9. If the phase difference is 3Ϊ or 23 выходе, then the output of the decryption block 9 forms a switching signal at the input of the integration block 10.

Upon receipt of the input unit 10 of the integration of N such signals for the measurement interval at the output of the block 10 integration generates a switching signal that coincides in phase With the moments of manipulation in the received FM signal.

(FM)

signal,

neighbors by.0

15

20

25

thirty

35

45

50

55

If the phase difference is equal to ^ 2 or 31/2, then at the output of decoding unit 9 a switching signal is not generated. The switching signal coming from the output of the integration unit 10 to the input of the phase manipulator 4, at the output of the phase manipulator 4, changes the phase of the reference coherent voltage by an angle multiple of L / 2, thereby preparing the device to receive the next parcel.

The device requires a certain time interval for entry into synchronism.

The proposed device can also be used to receive double signals with OFM and the minimum phase difference between adjacent premises equal to zero. This should break the circuit from the output of the block 10 integration to the input of the phase manipulator 4.

When receiving double signals with OFM and the minimum phase difference between adjacent premises equal to 45 °, it is enough to rebuild the decryption block 9 and the phase manipulator 4.

The introduction of a phase rotation unit into a receiver will reduce twice the uncertainty of the initial phase of the reference coherent voltage when receiving FM signals with a minimum phase difference between adjacent premises not equal to zero, which in turn allows using a conventional, coherent OFM receiver for receiving signals of this type signals without additional detection channels and increase the reliability of the device when receiving signals with a rotating phase.

Claims (1)

Claim “A device for receiving signals with relative phase modulation, containing a coherent voltage reference driver serially connected, a phase manipulator, a phase detector, another input of which is connected to the input of a coherent voltage reference generator, a regenerator and a code converter, other inputs of the regenerator and a code converter connected to the output of a clock extraction unit frequencies whose inputs are connected respectively to the input and output of the reference driver 915276 five coherent voltage, characterized in that, in order to improve reliability when receiving signals with a rotating phase, a phase rotation unit of a reference coherent voltage is inserted, containing successively connected comparison, decryption and integration units, the control inputs of which are connected to the control unit whose inputs are connected 10 respectively with the outputs of the coherent voltage driver and the clock selection block, 6 the other inputs of the comparator are connected respectively to the input and output of the shaper of the reference coherent voltage and the output of the phase manipulator, the other input of which is connected to the output of the integrator.