Generator of discrete orthogonal signals

FIELD: electricity.

SUBSTANCE: generator of discrete orthogonal signals comprises a driving oscillator, a unit of Walsh functions generation, an element of single-sided conductivity, a four-digit cyclic shift register, a double-input commutator, a controller inverter and 2n group multipliers.

EFFECT: increased energetic security of signals generated by a generator.

8 dwg, 3 tbl

 

The invention relates to the field of telecommunications, in particular to the generators of the orthogonal signals, and can be used to create a generator equipment multi-channel systems and communication networks.

Known generator of discrete orthogonal signal containing a clock generator, the power generation of the Walsh function, the shaper pulse, trigger, two keys, adder, 2nmultipliers of the first group, 2nmultipliers of the second group, 2ninverters, 2n-1- bit cyclic shift register and controlled inverter (patent No. 2022332 to the invention, the Generator of discrete orthogonal signals from 08.07.1991, published in Bulletin No. 20 of 30.10.1994).

However, the signals generated by this generator is described by the sequences of the modified code, reed-Muller, have 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 a function generator that contains a master oscillator, the power generation of the Walsh function, the element unilateral conductivity, digit shift register, input switch, multiplier, 2nmultipliers groups, where 2 n- number of outputs of the processing unit 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, 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 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 with the first inputs of all multipliers of the group, the second inputs of the i-x multipliers groups, where- the sequence number of multipliers connected to the 1-m outputs of the processing unit of the Walsh function, and the outputs of the multipliers groups are the outputs of the generator (patent No. 2277718 invention "function Generator" from 25.11.2004, published in Bulletin No. 16 dated 10.06.2006).

However, the signal is s, 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 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, the power generation of the Walsh function, the element unilateral conductivity of two-input switch, 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 of the processing unit of the Walsh function, 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, entered the four-digit cyclic shift register and controlled inverter, and 2n-lthe 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 a clock input four-bit cyclic shift register and control input of two-input switch, the first details rmational input of two-input switch is connected to 2 n-l-m output processing unit of the Walsh function, the second information input of two-input switch is connected to (2n-1+n)-th output block of the formation of the Walsh function, the output of two-input switch connected to the information input of the control of the inverter, the control input of which is connected to the output of the high-order four-bit cyclic shift register, the output of the controlled inverter connected to the first inputs of all multipliers of the group.

Figure 1 shows the block diagram of the generator of discrete orthogonal signals, figure 2 - timing diagram illustrating the process of forming discrete orthogonal signal A (12, θ) in the proposed generator, figure 3 - view of discrete orthogonal signals at the analog outputs, 4 - view of discrete orthogonal signals at the outputs of the prototype, figure 5 - view of discrete orthogonal signals at the outputs of the proposed generator, 6 - amplitude-frequency spectra of the signals generated by the analog, 7 - amplitude-frequency spectra of the signals generated by the prototype, Fig - amplitude-frequency spectra of the signals generated the proposed generator discrete orthogonal signals.

The function generator includes a master oscillator 1, block 2 formation of the Walsh function, element 3 unilateral conductivity, even regrettably cyclic shift register 4, two-input switch 5, a controlled inverter 6, the multipliers 7 group.

The function generator operates as follows.

Before starting the generator in the fourth category (the highest bit) four-bit cyclic shift register 4 recorded unit.

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 the second inputs of respective multipliers 7 groups. The Walsh function Wal (2n-1-1, θ)formed on 2n-1th output unit 2 (for the case of 2n=16 this will be the function Wal (7, θ)), (2, b) is input to element 3 unilateral conductivity, which can be used an ordinary diode, the output of which the clock input four-bit cyclic shift register 4 is supplied to only the positive part of the Walsh functions Wal (2n-1-1, θ) (figure 2, b).

Due to the fact that in the fourth digit four-digit register 4 offset (which is cyclic, that is closed in a ring feedback circuit, as in the analogue - patent No. 2022332 to the invention, the Generator of discrete orthogonal signals from 08.07.1991, published in Bulletin No. 20 of 30.10.1994) in the initial state was recorded unit, with the arrival of the first pulse from the output element 3 sided the conductivity on the clock input the four-digit of the shift register 4 is moved to the first bit of shift register 4. With the arrival of the second pulse unit is shifted to the second category, with the arrival of the third pulse in the third category, with the arrival of the fourth pulse in the fourth category.

The exit status of the high-order four-digit of the shift register 4 is shown in figure 2, was

The sequence of ones and zeros from the output of the shift register 4 is supplied to the control input of the controlled inverter 6.

The sequence of ones and zeros from the output element 3 unilateral conductivity was also fed to the control input of two-input switch 5, arranged in such a way that when it arrives at the control input "1" at the output of switch 5 the information received at its first input, and when it arrives at the control input "0" at the output of switch 5 the information received at its second input.

At the first input of the switch 5 receives the signal Walsh Wal (7, θ), and the second signal Walsh Wal (11, θ).

Thus, the signal at the output of the switch 5 (figure 2, e) is determined by the type of signal Walsh Wal (7, θ) (2, b) and signal Walsh Wal (11, θ) (figure 2, d), and the value of the control signal from the output element 3 unilateral conductivity (figure 2, b).

The output signal from the switch 5 (Fig 2, e) is supplied to the information input of the control of the inverter 6, the control input of which is fed the signal o is Yes, the shift register 4 (2, g), resulting in the output of the controlled inverter 6 a signal (figure 2, g)received at the first inputs of all of the multipliers 7 group.

As to the second inputs of the multipliers 7 group serves the appropriate signals Walsh Wal (i, θ), their outputs are generated discrete orthogonal signals A (i, θ), has a structure different from the structure of the Walsh functions Wal (i, θ), from the structure of the signals R (i, θ)generated by the analog, and the structure of the signals V (i, θ)generated by the prototype.

Figure 2 shows the timing charts illustrating the process of forming the output signal A (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) the eighth output unit 2 the formation of the Walsh function, which is formed by the function Wal (7, θ);

C) the output element 3 unilateral conductivity;

g) output of four-bit cyclic shift register 4;

d) the twelfth unit output 2 formation of the Walsh function, which is formed by the function Wal (11, θ);

e) output switch 5;

W) output controlled inverter 6;

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

and exit the thirteenth multiplier 7 group, which is formed by discrete orthogonal signal A (12, θ).

On Fig shows time diagrams of sequences of code, reed-Muller R (i, θ)generated by the analog. Figure 4 shows the timing chart of discrete orthogonal functions V (i, θ)generated by the prototype. Figure 5 shows time diagrams of discrete orthogonal functions A (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 discrete orthogonal signals 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 General the m G (f)is a complex quantity and can be written in the form:

where

- real and imaginary parts of the spectral density of 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 electronic digital computer was the synthesized signals A (i, θ), with significant energy reserve compared with signals Walsh Wal (i, θ), signals R (i, θ)is described by the sequences of the modified code, reed-Muller generated by the analog and discrete orthogonal signals V (i, θ)generated by the prototype, with equal durations and energies.

For the output signals generated by the analogue prototype 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, 2 and 3.

Table 1
The highest emissions of the amplitude-frequency spectra of the signals R (i, θ)is described by the sequences of the modified code, reed-Muller generated by analog
The number of the signal To01234567
Maximum overshoot
0,380,350,320,410,320,500,450,48
The number of the signal To89101112131415
Maximum overshoot
0,460,380,440,46 0,430,480,460,42

Table 2
The highest emissions of the amplitude-frequency spectra of discrete orthogonal signals V (i, θ)generated by the prototype
The number of the signal To01234567
Maximum overshoot
0,310,350,380,360,50 0,440,390,42
The number of the signal To89101112131415
Maximum overshoot
0,330,50,410,330,390,390,390,36

Table 3
The highest emissions of the amplitude-frequency spectra of discrete orthogonal signals A (i, θ)generated by the proposed generator
The number of the signal To01234567
Maximum overshoot
0,320,310,320,330,320,310,330,31
The number of the signal To89101112131415
Maximum overshoot
0,330,340,320,340,320,340,320,32

For clarity, figure 6 shows the graphs of the amplitude-frequency spectra of the output signals R (0, θ), R (3, θ), R (5, θ), R (9, θ), R (13, θ)generated by the analog. Figure 7 shows the graphs of the amplitude-frequency spectra of the output signals V (, θ), V (3, θ), V (9, θ), V (12, θ), V (15, θ)generated by the prototype. On Fig presents graphs of the amplitude-frequency spectra of output signals And (6, θ)And (7, θ), A (11, θ), A (13, θ), A (14, θ)generated by the proposed generator. Thus ω=2πf.

From tables 1, 2 and 3, and 6, 7 and 8 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 analog and the prototype that provides increased energy reserve.

Because the greatest levels of amplitude-frequency spectra of the signals generated by the analogthe greatest emission amplitude-frequency spectra of the signals generated by the prototypeand 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 1,47.

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

Generator discrete orthogonal signals, with whom containing a series of master oscillator, block the formation of the Walsh function, the element unilateral conductivity of two-input switch, 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 of the processing unit of the Walsh function, 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, characterized in that, to improve energy stealth signals generated by the generator, enter the four-digit cyclic shift register and controlled inverter, and 2n-1the 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 a clock input four-bit cyclic shift register and control input of two-input switch, the first information input of two-input switch is connected to 2n-1-m output processing unit of the Walsh function, the second information input of two-input switch is connected to (2n-1+n)-th output block of the formation of the Walsh function, the output of two-input switch connected to the information input of the control inverter control is allowing the input of which is connected to the output of the high-order four-bit cyclic shift register, the output of the controlled inverter connected to the first inputs of all multipliers of the group.



 

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