Functions generator

FIELD: electric communication area, in particular, engineering of orthogonal functions generators, possible use for engineering generator equipment for communication systems.

SUBSTANCE: generator of functions contains set-point generator, block for forming Walsh functions, element of one-sided conductivity, two-bit shift register, two-input commutator, multiplier and 2n group multipliers.

EFFECT: increased energetic concealment of signals, created by generator.

6 dwg

 

The invention relates to the field of radio and telecommunications, in particular to the generators of orthogonal functions, and can be used to create a generator communications equipment.

Known function generator Walsh, containing triggers and multiplier products (see Austrian scientist, D.Sc H.F. Transmission of information by orthogonal functions. M: Communications, 1975, p.66, RIS).

However, this generator has a large instrumental orthogonality error arising due to the recursive nature of the rules of multiplication, leading to low noise immunity generated functions. In addition, the signals generated by this generator are large largest emission amplitude-frequency spectra, which indicates poor uniformity of the spectral density, resulting in low energy stealth generated signals.

The closest in technical essence of the present invention is the generator of the Walsh function, containing the master oscillator and the power generation of the Walsh function, and the output of the master oscillator is connected to a clock input of the processing unit of the Walsh function (see Bedwetter K. Generation of the Walsh function. Foreign electronics, 1972, No. 11, p.77, Fig.6).

However, the signals generated by the function generator Walsh, have large largest emission amplitude-frequency specification of the TRS, that indicates poor uniformity of the spectral density, resulting in low energy stealth generated signals.

The aim of the invention is the improvement of energy stealth signals generated by the generator.

This objective is achieved in that in the known generator containing the master oscillator and the power generation Walsh, and the output of the master oscillator is connected to a clock input of the processing unit of the Walsh function, the input elements to the unilateral conductivity, digit shift register, a switch, a multiplier and 2nmultipliers groups (where 2n- number of outputs of the processing unit of the Walsh function), and the output of the master oscillator is connected to a clock input digit of the shift register, the second output of the processing unit of the Walsh function is connected to the input element of the one-way conduction, the output element of unilateral conductivity is connected with the information input digit of the shift register, the output of which is connected to the control input of two-input switch, the first information input of which is connected to (2n-1-2)-th output block of the formation of the Walsh function, the second information input of the switch is connected to (2n-1+1)-th output block of the formation of the Walsh function, the output switch connected to the first input of the multiplier, the Torah, the inlet of which is connected to the second output of the processing unit of the Walsh function, the output of the multiplier is connected with the first inputs of all multipliers of the group, the second inputs of the i-x multipliers groups (where- the sequence number of the multipliers are connected to the i-th outputs of the processing unit of the Walsh function, and the outputs of the multipliers groups are the outputs of the generator.

Figure 1 shows the block diagram of the function generator, figure 2 - timing diagram illustrating the process of forming the function T (12, θ) in the proposed generator, figure 3 - type functions on the outputs of the prototype, figs.4 - type functions on the outputs of the proposed generator, figure 5 - amplitude-frequency spectra of the signals generated by the prototype, figure 6 - amplitude-frequency spectra of the signals generated by the proposed function generator.

The function generator includes a master oscillator 1, block 2 formation of the Walsh function, element 3 unilateral conductivity, digit shift register 4, the input switch 5, the multiplier 6, the multipliers 7 group.

The function generator operates as follows.

Before working generator discharges the shift register 4 is set to the zero state.

With the beginning of the receipt of the pulses output from the oscillator 1 to the clock input of block 2 of the formation of the Walsh function (figure 2, a) on its outputs are generated functions Walsh received at a second input soo the relevant multipliers 7 groups. The Walsh function Wal (1, θ)generated on the second output unit 2 (2, b), is input to element 3 unilateral conductivity (which can be a simple diode), with which the information input of the shift register 4 is supplied to only the positive part of the Walsh functions Wal (1, θ) (figure 2). To the clock input of shift register 4 receives the pulses from the output of the generator 1.

Due to the fact that in the double digits of the shift register 4 in the initial state were recorded zero information at its output is shifted with respect to its input to two bars (figure 2, d). The sequence of ones and zeros from the output of the shift register 4 is supplied to the control input of two-input switch 5, arranged in such a way that when it arrives at the control input "0" at the output of switch 5 the information received at its first input, and when it arrives at the control input "1" at the output of switch 5 the information received at its second input.

Thus, the signal at the output of the switch 5 (2, W) is determined by the type of signal Walsh Wal (5, θ) (figure 2, d) and type of signal Walsh Wal (8, θ) (figure 2, e).

The output signal from the switch 5 (Fig 2, d) is supplied to the first input of the multiplier 6, the second input of which the signal Wal (1, θ) (figure 2, b) from the second output unit is 2 formation of the Walsh function, resulting at the output of the multiplier 6 is a signal received at the first inputs of all of the multipliers 7 groups (see figure 2, C). As to the second inputs of the multipliers 7 group serves the appropriate signals Walsh Wal (1, θ), their outputs are generated function T (i, θ), having a form different from the form of Walsh functions Wal (i, θ).

Figure 2 shows the timing charts illustrating the process of forming the output signal T (12, θ) in the proposed generator for the case of 2n=16.

The graphs depict a temporary condition:

a) the output of the master oscillator 1;

b) a second exit block 2 formation of the Walsh function, which is formed by the function Wal (1, θ);

C) the output element 3 unilateral conductivity;

g) output digit of the shift register 4;

d) the sixth output unit 2 the formation of the Walsh function, which is formed by the function Wal (5, θ);

e) the ninth output unit 2 the formation of the Walsh function, which is formed by the function Wal (8, θ);

W) output switch 5;

C) output of the multiplier 6;

and the thirteenth output unit 2 of the Walsh function, which is formed by the function Wal (12, θ);

to exit the thirteenth multiplier 7 group, which is formed by the function T (12, θ).

Figure 3 shows time diagrams of the Walsh function generated by the prototype. Figure 4 preveduniversity orthogonal function T (i, θ)generated by the proposed generator.

The orthogonality of the signals generated by the proposed generator, you can verify by multiplying all the generated functions and integrating the result over time equal to the period of the function.

As is known, the energy reserve signals characterizes the ability to resist the measures aimed at the detection output signals intelligence receiver (see Aces GI, Sivov VA Interference protection radio systems with complex signals, Ed. Tuzova GI - M.: Radio and communication, 1985, p.9).

To increase the energy stealth, you must strive to ensure that output signals generated by the generator used in the communication system, had a uniform spectral density (see Aces GI, Sivov VA Interference protection radio systems with complex signals, Ed. Heatwave. - M.: Radio and communication, 1985, p.21, Fig.2.2).

The spectral density is an important characteristic of the signal and represents the Fourier transform of its temporal representation S(t):

In the General case of G(f)is a complex quantity and can be written in the form:

where

- the real and the imaginary is Asti spectral density G (f),

module and argument of the spectral density of G(f).

Typicallycalled the amplitude-frequency spectrum of the signal S(t) and in his mind determine the uniformity of the spectral density (see Smirnov NI, Gorgadze SF Design of a microelectronic device processing of noise signals. Part 2. The spectral properties of the PSS. - M.: the Ministry of communications of the USSR, 1989, p.4-5).

The gain in energy stealth signals useful in determining relative values of largest emissions of the amplitude-frequency spectra of the compared signals:

where- maximum discharge amplitude-frequency spectrum of the signal A(t)- maximum discharge amplitude-frequency spectrum of the signal B(t) (see Smirnov NI, Gorgadze SF Design of a microelectronic device processing of noise signals. Part 2. The spectral properties of the PSS. - M.: the Ministry of communications of the USSR, 1989, s).

Using EDCM were synthesized signals T (i, θ)with significant energy reserve compared with signals Walsh Wal (i, θ) with equal durations and energies.

For the output signals generated by the prototype of the m and the proposed generator, were designed with the greatest emission amplitude-frequency spectra in accordance with equation (5).

The results of the calculation for option 2n=16 are shown in tables 1 and 2.

Table 1

The highest emissions of the amplitude-frequency spectra of the signals generated by the prototype
The number of the signal To01234567
Maximum overshoot10,720,650,650,630,550,550,63
The number of the signal To89101112131415
Maximum overshoot0,630,510,320,440,510,480,510,63
Table 2

The highest emissions of the amplitude-frequency spectra of the signals generated by the proposed generator
The number of the signal To012 34567
Maximum overshoot0,310,350,380,360,50,440,390,42
The number of the signal To89101112131415
Maximum overshoot0,330,50,410,330,390,390,390,36

For clarity, figure 5 shows graphs of the amplitude-frequency spectra of output signals Wal (0, θ), Wal (2, θ), Wal (6, θ)generated by the prototype. Figure 6 shows the graphs of the amplitude-frequency spectra of output signals T (0, θ), T (3, θ), T (9, θ), T (12,θ) and T (15, θ)generated by the proposed generator. When it ω=2πf.

From tables 1, 2 and 5, 6 it is seen that the signals generated by the proposed generator, have the best uniformity of the spectral density than the output signals generated by the prototype that provides increased energy reserve.

Because the greatest levels of amplitude-frequency spectra of the signals is also and the greatest levels of amplitude-frequency spectra of the signals generated by the proposed generatorin accordance with equation (7) gain in energy stealth is:

Calculations show that when 2n≥16 gain in energy stealth is not less than 2.

The use of the invention allows to create function generators, providing a significant increase in energy stealth generated signals.

The function generator containing the master oscillator and the power generation of the Walsh function, and the output of the master oscillator is connected to a clock input of the processing unit of the Walsh function, characterized in that, to improve energy stealth signals generated by the generator, it introduced an element of unilateral conductivity, digit shift register, input switch, multiplier and 2nmultipliers groups, where 2n- number of outputs of the processing unit of the Walsh function, and the output of the master oscillator is connected to a clock input digit of the shift register, the second output of the processing unit of the Walsh function is connected to the input element of the one-way conduction, the output element of unilateral conductivity is connected with the information input DV is digit of the shift register, the output of which is connected to the control input of two-input switch, the first information input of which is connected to (2n-1-2)-th output block of the formation of the Walsh function, the second information input of two-input switch is connected to (2n-1-1)-th output block of the formation of the Walsh function, the output of two-input switch connected to the first input of the multiplier, the second input is connected to the second output of the processing unit of the Walsh function, the output of the multiplier is connected to the first outputs of all multipliers of the group, the second inputs of the i-x multipliers groups, where

- the sequence number of multipliers connected to the i-th outputs of the processing unit of the Walsh function, and the outputs of the multipliers groups are the outputs of the generator.



 

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