SU396825A1 - FORMER OF PHASE MANIPULATION - Google Patents

Description

one

The invention relates to communications and can be used in FM transmitters.

Known drivers of phase manipulation with a synchronizing pilot signal containing carrier-connected serially connected carrier generator and two phase shifters, control value of the first of which is connected to the output of the clock generator through the pulse shaper, and the second with the information source through the clock frequency synchronizer , do not provide direct formation of phase shift keying with a synchronization pilot signal.

The aim of the invention is to eliminate this drawback.

For this purpose, an additional phase manipulator has been introduced into the phase shift keying device, the input of which is connected to the output of the clock frequency generator, and the output is connected to the control input of the above mentioned clock frequency synchronizer.

FIG. 1 is a block diagram of the proposed phase shift keying generator; in fig. 2 - spectrum of the resulting signal; in fig. 3 is a vector diagram explaining the operation of the phase shift manipulator.

The phase shift keying generator contains a carrier / generator, the first phase

maniaulor 2, second phase manipulator 3, additional phase manipulator 4, clock frequency generator 5, pulse driver 6, synchronizer 7, and information source 8.

Carrier Generator / Generate Voltage

and, I /, cos (sho / -fro),

which is fed to two phase lines 2, 3, connected in sequence. Clock 5 generates a voltage

U, V - smQf,

where H 2 / G, T is the duration of a manipulation pulse, which is fed to an additional phase handler 4 n through a pulse shaper 6 pa synchronizer 7 pulses of the information code created by the information source 8. The output of the synchronizer 7 is pulsed, temporary whose position corresponds to the zero phase of the oscillation L frequency.

5 Voltage

2 (± 1) w, f-1 281PSh,

where (± 1) 1shf is a unit amplitude oscillation, the polarity of which depends on "0 units or zeros of the information code, from the output of the additional phase manipulator 4 is fed to the control circuit of the phase manipulator 2. The phase manipulator 2 performs the manipulation phase at an angle ± AF papp zhepp carrier. At the same time, a voltage Ul, imenu1, its appearance is created at its output:

and g - 1/1. cos К 4- сро + А (± 1) ш, ф (± 1), 1,

where (± 1) and -periodic oscillation of a single amplitude of the clock frequency fi. The phase manipulator 3 performs further phase phase manipulation on the DF angle with a synchronized signal and information. The resulting signal Uf, obtained at the output of the manipulator 3, is an oscillation with double phase manipulation.

/, 1 / -С08 t „+ Fo + A (± 1)„ „f- (± 1)., + + AF- (± 1) inf1

Swing Uc. can be represented as a sum of quadrature components, the first of which carries information, and the other is a synchronization pilot signal;

and, (± 1) „„ f-81p 1DF + Ds (± ly X

X sin K + o) + cos DF D (± 1, X

X cos ("c / + o).

The spectrum of such a snnal nokazap pa fng. 2. Its peculiarity lies in the fact that, along with the continuous part of the spectrum defined by the information, there are discrete components, carrier and symmetrical lateral components, separated from the carrier by the clock frequency, which do not depend on the information. Friend

The feature of the generated signal Ug is that the level of the harmonic components of the spectrum, independent of the information, can be changed by changing the depth of manipulation of phase manipulators 2 and 5. The specificity of forming the phase manipulator by the former is that the position of the vector of the resulting signal at points 1.0 and 1.0 (see Fig. 3), where points 1.1 show the positions of the vector of the resulting signal Ug when transmitting "units of information code and pulping by an angle ± Df with the clock signal, and points 0.0 - position in The vector of the resulting signal 5, when transmitting "zeros of the information code and manipulating an angle of ± Dsr with the clock frequency signal, is synchronized.

Subject invention

A phase shift keying driver with a synchronizing pilot signal containing a series-connected carrier generator and two phase sensors in the carrier circuit, the control circuit of the first of which is connected to the output of the clock generator via the pulse shaper, and the second with the information source through the clock synchronizer, characterized in that, in order to directly form a phase shift keying with a synchronizing pilot signal, an additional phase handler is introduced into it, the cat input cerned is connected to the output of the clock generator, and the output - to the control input of clock synchronizer mentioning.

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F, -I cjp

fpug 2

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