RU145405U1 - 180 ° SIGNAL SHAPER WITH 180 ° PHASE MANIPULATION - Google Patents

Abstract

180 ° phase shift keying (PSK) signal shaper, consisting of an analogue speech signal (IRS) source connected in series, an analog single-band signal shaper (FOS), an amplifier-limiter (UO) of the signal amplitude, a coherent detector (CD), and a signal multiplier ( P), as well as from the auxiliary carrier frequency (GV) generator and the carrier frequency generator (GV), and the GV output is connected to the second input of the FOS and the second input of the CD, and the GV output is connected to the second input of the multiplier, characterized in that additional There are two 90-phase phase shifters, a second coherent detector, a second signal multiplier, a phase inverter (FI) and an adder, moreover, one adder input is directly connected to the output of the first multiplier, and its second input is connected to the information input of the first coherent detector through the second coherent a detector, a second signal multiplier, a phase inverter when working on the upper side strip, and when working on the bottom, the phase inverter is turned off; the second input of the second multiplier is connected to the output of the carrier frequency generator through one 90 ° phase shifter, and the second input of the second coherent detector is connected to the second input of the first coherent detector through the second 90 ° phase shifter; the output of the adder is the output of the entire shaper.

Description

The utility model (PM) relates to radio transmission of clipped speech signals (PC) using phase shift keying (PSK) through 180 °.

Known signal conditioners with two-band PSK 180 °, described in sources, for example in:

1. Petrovich N.T., Kozlenko N.I. Transmission of clipped speech signals using phase telegraphy // Radio engineering No. 11, t. 19, 1964

2. Petrovich N.T. Discrete information transmission in channels with phase shift keying. - M.: Soviet Radio, 1965

By technical nature, the device closest to PM is the device described in the first source, which for this reason is taken as its prototype. The second source describes an analogue of PM.

The prototype consists of a series-connected source of analog RS (IRS), a shaper of a single-band signal (FOS); an amplifier-limiter of amplitude (UO) of a single-band signal, a coherent detector (CD) of a limited single-band signal, a signal multiplier (P), an amplifier (U), as well as from an auxiliary carrier frequency (GV) generator and a carrier frequency generator (GN), output which is connected to the second input of the multiplier P, and the GV output is connected to the second input of the FOS and the second input of the CD. The speech signal is broadband, and therefore it is converted to single-band (narrow-band) in the FOS block to minimize non-linear distortion in the block of UO. In the CD block, a single-band signal limited in amplitude is again transferred to the tonal frequency range (i.e., to the low frequency range). From the CD block, an alternating signal of a rectangular shape of a low frequency (n.h.) of constant amplitude and variable duration and repetition rate is fed to the input of the signal multiplier P, to the high-frequency input of which the carrier frequency oscillates from the GN. At the output of block P, there is a phase-shifted (QPSK) 180 ° oscillation, the noise immunity of which is the maximum possible (potential). But since the modulating signal n.ch. has a rectangular shape, then its frequency band is much wider than the frequency band of the original RS, which is why the frequency band of the PSK signal at the output of the multiplier, which is equal to the two frequency bands of the modulating RS, is also wide.

The main disadvantage of the prototype is the relatively wide frequency band of the signal with a two-band PSK 180 °, which exacerbates the main problem of radio communications - the lack of frequency resource.

The technical result of PM is to reduce the frequency band of the signal from the PSK by 180 ° in 2 times.

The essence of PM consists in the fact that in a signal shaper with phase shift keying (QPS) at 180 °, consisting of a series-connected source of an analog speech signal (IRS), a shaper of an analog single-band signal (FOS), an amplifier-limiter (UO) of the signal amplitude, coherent detector (CD), signal multiplier (P), as well as from the auxiliary carrier frequency generator (GV) and the carrier frequency generator (GN), moreover, the GV output is connected to the second input of the FOS and the second input of the CD, and the GN output is connected to the second input multiplier introduced additionally two phase shifters ФВ 90 °, a second coherent detector, a second signal multiplier, a phase inverter (FI) and an adder, moreover, one adder input is directly connected to the output of the first multiplier, and its second input is connected to the information input of the first coherent detector through the second a coherent detector, a second signal multiplier, a phase inverter when working on the upper side strip, and when working on the bottom, the phase inverter is turned off; the second input of the second multiplier is connected to the output of the carrier frequency generator through one 90 ° phase shifter, and the second input of the second coherent detector is connected to the second input of the first coherent detector through the second 90 ° phase shifter; the output of the adder is the output of the entire shaper.

A significant difference between the PM is the totality of the introduced elements and their connections, which made it possible to implement this shaper, increasing the frequency efficiency by 2 times at the maximum possible noise immunity of the communication.

PM is illustrated in the drawing.

In FIG. 1 shows a structural diagram of the proposed shaper, where indicated:

1 - source of an analog speech signal;

2, 9, 12 - signal multipliers;

3, 10 - auxiliary and carrier frequency generators;

4 - band-pass filter;

5 - amplifier limiter of the amplitude of the signals;

6, 8 - coherent detectors;

7, 11 - phase shifters of signals by 90 °;

13 - signal adder;

14 - phase inverter signals.

Entered elements are outlined with a dashed line. The operation of the circuit is as follows.

The signal b (t) = U (t) cosφ (t) from the source of the analog speech signal (IRS) 1 is fed to the low-frequency (N.Ch.) input of the multiplier 2, to the high-frequency (V.Ch.) input of which the auxiliary carrier frequency oscillates u _н3 = U ₃ cosωt from generator 3. At the output of multiplier 2, an oscillation is generated: u ₂ (t) = b (t) u ₃ (t) = 0.5U (t) U ₃ [cos (ωt + φ (t) + cos (ωt-φ (t))]. The band-pass filter 4 passes on its output only one side frequency band (OBP AM), for example, the upper (first term), which is amplified and limited in amplitude in block 5, so that it the output will be a single-lane whitefish constant level, which, to simplify further calculations, we will represent its first harmonic: u ₅ (t) = Ucos (ωt + φ (t)). This signal is fed to the information inputs of coherent detectors 6 and 8. From the generator 3, the auxiliary carrier frequency oscillation is supplied to the reference input of block 6 directly and to the reference input of block 8 through a 90 ° phase shifter 7. Each coherent detector consists of a signal multiplier and a low-pass filter (LPF) at its output. At the outputs of these multipliers, oscillations are formed:

;

.

The high-frequency components (second terms) are eliminated by the low-pass filters of the detectors, as a result of which the square-shaped signals 6 and 8 differ only in a phase shift of 90 °, i.e. represent a modulating signal of constant amplitude b (t) and its quadrature . Since these signals have a rectangular shape, their frequency band is much larger than the frequency band of the original PC from block 1, which made it difficult to form one side band using known elements: 90 ° phase shifters or band pass filters with steep slopes (electromechanical, piezoceramic, etc. )

It is seen that in our case, a phase shift of 90 ° of the reference oscillation of only one frequency leads to a phase shift by the same angle of the entire spectrum of the limited modulating signal b (t) = Ucosφ (t). Moreover, the error of this shift can be arbitrarily small (Δφ <1 °), since in block 8 the reference oscillation of only one (auxiliary) carrier frequency is rotated 90 °. The latter is possible only in the case of a single-band signal, which is one of its unique properties.

Next, the rectangular signal u ₆ (t) is fed to the signal input of the multiplier 9, and the rectangular signal u ₈ (t) is fed to the signal input of the multiplier 12. From the generator 10, the carrier frequency oscillation u ₁₀ (t) = U ₁₀ cosω ₀ t is fed to the high-frequency the input of the multiplier 9 directly, and to the RF input of the shifter 12 through the phase shifter 90 ° 11. At the output of these multipliers oscillations are formed - two-way FMN at 180 °; - two-way PSK 180 ° which are supplied to the corresponding inputs of the adder 13. If the signal u ₁₂ (t) goes directly to the adder 13, then its output has a lower side band (NBP) u ₁₃ (t) = u ₉ (t) + u ₁₂ (t) = UU ₁₀ cos (ω ₀ t-φ (t)), and if it comes through the phase inverter of the FI, then the upper side band (PFS) is formed: u ₁₃ (t) = u ₉ (t) -u ₁₂ (t) = UU ₁₀ cos (ω ₀ t + φ (t))

The technical and economic effect of PM is to halve the frequency band of the radio signal, which allows you to organize two channels in the given frequency band instead of one at the maximum possible noise immunity of radio communications.

Claims (1)

180 ° phase shift keying (PSK) signal shaper, consisting of an analogue speech signal (IRS) source connected in series, an analog single-band signal shaper (FOS), an amplifier-limiter (UO) of the signal amplitude, a coherent detector (CD), and a signal multiplier ( P), as well as from the auxiliary carrier frequency (GV) generator and the carrier frequency generator (GV), and the GV output is connected to the second input of the FOS and the second input of the CD, and the GV output is connected to the second input of the multiplier, characterized in that additional There are two 90-phase phase shifters, a second coherent detector, a second signal multiplier, a phase inverter (FI) and an adder, moreover, one adder input is directly connected to the output of the first multiplier, and its second input is connected to the information input of the first coherent detector through the second coherent a detector, a second signal multiplier, a phase inverter when working on the upper side strip, and when working on the bottom, the phase inverter is turned off; the second input of the second multiplier is connected to the output of the carrier frequency generator through one 90 ° phase shifter, and the second input of the second coherent detector is connected to the second input of the first coherent detector through the second 90 ° phase shifter; the output of the adder is the output of the entire shaper.