Generator of orthogonal signals with improved autocorrelation characteristics

FIELD: physics, computation equipment.

SUBSTANCE: generator of discrete orthogonal multilevel signals includes pacing generator, frequency splitter, Walsh function generation unit, three multiplier groups, 'NOT' element, switchboard, two control signal generation units, and amplifiers with variable amplification gain. Pacer generator output is connected to input of frequency splitter, output of which is connected to clock input of Walsh function generation unit, to first input of each multiplier of first group, and via 'NOT' element to first input of each amplifier of second group, to clock inputs of control signal generation units. Outputs of Walsh function generation unit are connected to first input of corresponding amplifier from third group, to master input of switchboard, and to data input of switchboard respectively. Switchboard output is connected to second inputs of all third group amplifiers. Output of one of the third group amplifiers is connected to second outputs of respective amplifiers from the first and second groups. Outputs of amplifiers from the first and second groups are connected to inputs of respective amplifiers with variable amplification gain. Outputs of control signal generation units are connected to master inputs of amplifiers with variable amplification gain, outputs of which are the device outputs.

EFFECT: enhanced jamming resistance of generated discrete orthogonal signals.

4 dwg, 2 tbl

 

The technical field to which the invention relates.

The invention relates to automation and computer engineering and can be used to create a generator equipment multi-channel communication systems.

The level of technology

Known generator of discrete orthogonal functions, containing the master oscillator, frequency divider, the block units of the Walsh function, three groups of multipliers, the element and NOT the switch (see USSR author's certificate No. 1546953, CL G06F 1/02, 1988).

However, the signals generated by this generator have low immunity, because they have poor correlation properties - lateral peaks of the autocorrelation function (FAK) these signals have values close to 1.

The closest in technical essence of the present invention is a generator of discrete orthogonal functions, containing the master oscillator, frequency divider, the power generation of the Walsh function, three groups of multipliers, the element is NOT, the switch, and the output of the master oscillator is connected to the input of the frequency divider, the output of the frequency divider is connected to the clock input of the processing unit of the Walsh function, to the first input of each multiplier of the first group, and through the element NOT to the first input of each multiplier of the second group, the yield of the i-th (i=0, 2n-1) the functions of the Walsh block the formation of the Walsh function are connected to the EN to the first input of the first multiplier of the third group, the output of the second Walsh function block formation of the Walsh function is connected to the control input of the switch output 2n-1-th Walsh function block formation of the Walsh function is connected to the information input switch, output switch connected to the second inputs of all multipliers of the third group, the output of the i-th multiplier of the third group are connected to second inputs of the i-x multipliers of the first and second groups, the outputs of the multipliers of the first and second groups are the outputs of the generator discrete orthogonal functions (see USSR author's certificate No. 1783506, CL G06F 1/02, 1992).

However, the signals generated by this generator have low immunity, because they have poor correlation properties - amplitude lateral peaks of the autocorrelation functions of these signals have large values. The use of these signals in communication systems and radar systems is limited because of the side peaks in the autocorrelation functions have large values, which means that the signals have a masking effect against close range targets.

Disclosure of inventions

The objective of the invention is to develop a shaper of orthogonal signals, which will improve the immunity generated signals, by reducing the amplitudes of the side peaks of the EVIDENCE from these signals.

The technical result is at, which can be obtained using the present invention is to increase the noise immunity of the generated discrete orthogonal signals.

The technical result is achieved by the fact that in the known generator of discrete orthogonal functions, containing the master oscillator, frequency divider, the power generation of the Walsh function, three groups of multipliers, the element is NOT, the switch, and the output of the master oscillator is connected to the input of the frequency divider, the output of the frequency divider is connected to the clock input of the processing unit of the Walsh function, to the first input of each multiplier of the first group via element, NOT to the first input of each multiplier of the second group, the yield of the i-th (i=0, 2n-1) the Walsh function block function formation Walsh connected to the first input of the first multiplier of the third group, the output of the second Walsh function block formation of the Walsh function is connected to the control input of the switch output 2n-1-th Walsh function block formation of the Walsh function is connected to the information input switch, output switch connected to the second inputs of all multipliers of the third group, the output of the i-th multiplier of the third group are connected to second inputs of the i-x multipliers of the first and second groups, the outputs of the multipliers of the first and second groups are the outputs of the generator discrete orthogonal functions, introduced two of the Loka formation of control signals and amplifiers with variable gain, moreover, the output of the master oscillator is connected to the input of the frequency divider, the output of the frequency divider is connected to the clock input of the processing unit of the Walsh function, to the first input of each multiplier of the first group via element, NOT to the first input of each multiplier of the second group, to the clock inputs of the blocks forming control signals, the output of the i-th (i=0, 2n-1) the Walsh function block function formation Walsh connected to the first input of the first multiplier of the third group, the output of the second Walsh function block formation of the Walsh function is connected to the control input of the switch output 2n-1-th Walsh function block formation of the Walsh function is connected to the information input switch, output switch connected to the second inputs of all multipliers of the third group, the output of the i-th multiplier of the third group is connected to the second inputs of the i-x multipliers of the first and second groups, the outputs of the i-x multipliers of the first and second groups are connected to the inputs of the i-x amplifiers with variable gain, i-e the outputs of blocks forming control signals are connected to the i-th control inputs of amplifiers with variable gain, the outputs of the amplifiers with variable gain are the outputs of the device.

Brief description of drawings

Figure 1 shows the functional diagram of the inventive device, Fig presents timing diagrams, explaining the principle of the inventive device when forming the signal Z(5,Θ), figure 3 presents a view of the signals generated by the claimed device, figure 4 presents the autocorrelation function of the signals generated by the claimed device and the prototype.

The implementation of the invention

Figure 1 shows a functional diagram of the inventive device, where the master oscillator 1, the frequency divisor of 2, unit 3 the formation of the Walsh function, the multipliers 5, the first and second groups, multipliers 6 the third group, the element 4, the switch 7, the blocks 8 and 9 forming control signals and amplifiers 10 with variable gain, and the output of the master oscillator 1 is connected to the input of the divider 2 frequency output of the divider 2 frequency connected to the clock input unit 3, the formation of the Walsh function, to the first input of each multiplier is 5, and the first group via element 4 to the first input each multiplier 5 of the second group, to the clock inputs of the blocks 8 and 9 forming control signals, the output of the i-th (i=0, 2n-1) the Walsh function block 3 formation of the Walsh function is connected to the first input of the first multiplier 6 of the third group, the output of the second Walsh function block 3 formation of the Walsh function is connected to the control input of the switch 7, the output of the 2n-1-th Walsh function block 3 formation of the Walsh function is attached to inform the operating input of the switch 7, the output of the switch 7 is connected to the second inputs of all of the multipliers 6 the third group, the output of the i-th multiplier 6 the third group is connected to the second inputs of the i-x multipliers 5, the first and second groups, the outputs of the i-x multipliers 5, the first and second groups are connected to the inputs of the i-x amplifiers 10 with variable gain, i-e the outputs of blocks 8 and 9 forming control signals are connected to the i-th control input of the amplifier 10 with a variable gain, the outputs of the amplifiers 10 with variable gain are the outputs of the device.

Figure 2 shows time diagrams explaining the principle of operation of the inventive device, illustrating the process of forming the sequence Z(5,Θ) for the case n=3. To the timing charts shown a temporary condition:

a) the output of the clock generator 1;

b) output of the divider 2 frequencies;

C) the output element 4;

g) exit function Wal(2n-1;Θ) block 3 formation of the Walsh function;

d) exit function Wal(2,Θ) block 3 formation of the Walsh function;

e) output switch 7;

g) exit function Wal(5,Θ) block 3 formation of the Walsh function;

C) output of the multiplier 6, forming the signal R(5,Θ);

the output of the multiplier 5, form the signal S1(5,Θ);

K) the output of the multiplier 5, form the signal S2(5,Θ);

l) of the output unit 9 shaping the Oia control signals;

m) unit output 8 signal-conditioning control;

n) the output of the amplifier 10 with a variable gain, which is formed by the sequence Z1(5,Θ);

o) the output of the amplifier 10 with a variable gain, which is formed by the sequence Z2(5,Θ).

The device operates as follows. Upon receipt of pulses from the output of the master oscillator 1 through the divider 2 frequency at the clock input unit 3, the formation of the Walsh function, the outputs of block 3 are formed functions Walsh received at the first inputs of respective multipliers 6 of the third group.

On the control input of the switch 7 receives the Walsh function Wal(2,θ), and on the information input - function of the Walsh Wal(2n-1,θ).

Switch 7 operates as follows. When it arrives at its control input a positive voltage at the output of the switch 7 is formed by a signal on its data input. When applying to the control input of the negative voltage at the output of switch 7 is formed of a negative voltage.

Thus, during the period T of the Walsh function at the output of the switch 7 is formed a landmark function, representing the time interval [0, T/4] Walsh function Wal(2n-1,θ), on the interval [T/4, 3T/4] is a negative voltage, time interval [T/4, T] is again a function of the Walsh Wal(2n-1,θ).

In the multipliers 6 third group is the multiplication of all of the Walsh function sign function generated at the output of the switch 7.

From the outputs of the multipliers 6 of the third group of signals received at the second inputs of respective multipliers 5, the first and second groups. The first inputs of the multipliers 5, the first and second groups receive Gating pulses from the output of the divider 2, the frequency or the output element 4, respectively.

As a result, the outputs of the multipliers 5, the first and the second group is formed simultaneously 2n+1discrete orthogonal functions, and each of the signal obtained at the output of the corresponding multiplier 6 of the third group, formed two discrete orthogonal functions.

The generated discrete orthogonal function comes at the inputs of amplifier 10 with a variable gain, which operate in such a way that the rate of gain changes depending on the control information received from the blocks 8 and 9 forming control signals.

At clock inputs of blocks 8 and 9 forming control signals enter the gate pulses from the output of the frequency divider, which provide synchronous operation in conjunction with other elements of the device.

Unit 9 the generation of control signals fo the programmed matrix:

Unit 8 the formation of the control signals is a matrix:

Signals from the i-x output unit 9 to generate control signals in the form of rows of the matrix (1) are fed to the first control inputs of the i-x amplifiers 10 with variable gain, signals with the i-th output unit 8 of the generation of control signals in the form of rows of the matrix (2) are fed to the second control inputs of the i-x amplifiers 10 with variable gain. The gain of amplifier 10 with a variable gain factor depends on the combination of control signals on their control inputs, in accordance with table 1.

Changes in the gain of amplifier 10 c variable gain under the influence of control signals of the blocks 8 and 9 generate control signals at their outputs is formed by 2nmultilevel signal with improved correlation properties.

Table 1

The gains of the amplifiers with variable gain
The first control inputThe second control inputGain
005,5
0 1a 3.9
101,7
111,2

On figa, b, C, d shows the signals generated by the claimed device.

Figure 4 shows the values of the autocorrelation functions of the signals generated by the prototype and the claimed device.

An important characteristic of a periodic psevdochumoy sequence is periodic autocorrelation function, which is usually determined through the components of the bipolar sequence

where n is the period. It is clear that φ(j+rn)=φ(j) for any integer r.

Ideally, a pseudo-random sequence should have an autocorrelation function with the property φ(0)=n and φ(j)=0 for 1≤j≤n-1 (had Soured j. Digital communication. TRANS. from English. Ed. DOS. - M.: Radio and communication, 2000, s).

It is known that good synchronization code word is one that has a small absolute value of the side maxima of the correlation". Side the maximum correlation is the correlation value of the code word with their own biased version (Sklar, B. Digital communications. Theoretical foundations and practical applications, 2nd ed.: TRANS. from English. - M.: Publishing house "Williams", 2003, s).

Signals with lower amplitude side peaks of the autocorrelation is elational functions are more robust.

Values of the side peaks of the autocorrelation function, which is usually smaller than the main, depend on the actual code sequence (in this case, the signal at the output of the generation of discrete orthogonal multi-level signals) and are a consequence of partial correlation code sequence with the same code sequence shifted in time. If you experience these side peaks of the autocorrelation function, the ability of the receiver (communication system that uses signals of a particular class) to establish a reliable synchronization worse, because in this case he must distinguish between the main and lateral peak of the autocorrelation function (see Dixon R.K. Broadband system. - M.: the Relationship 1979, p.67).

Using the developed algorithm of synthesis and the PC was synthesized system multilevel discrete orthogonal signals generated by the claimed device, having the best of the autocorrelation function and indicators of distinctiveness than the signals generated by the analog and the prototype. This suggests that they are more robust compared to the signals generated by the analog and the prototype.

Signals generated by the analogue prototype and declare ustroystvami calculated maximum lateral peaks of the autocorrelation functions. The results of the calculations are presented in table 2.

As follows from table 2, the gain on the value of the maximum lateral peak of the autocorrelation function of the signals generated by the claimed device with respect to the signals generated by the analog is the value of 0.37, as compared to the signals generated by the prototype 0,12.

Estimate the value of the gain in noise signals generated by the claimed device, in relation to the signals generated by the analog and the prototype. We will use the relation that binds the value of the maximum lateral peak of the ACF used in the communication system signals and the desired signal-to-noise ratio, which is necessary to provide for its sustainable performance (see Varakin LE Detection of complex signals and measurement // journal of communications technology and electronics. - 1973. No. 8. - S)

where q is the signal - to-noise ratio [dB].

We define the ratio (4) the amount of gain on the signal-to-noise ratio from the use of signals generated by the claimed device. To do this, find the value of the signal-to-noise ratio required for the stable operation of the communication system when applying the signals generated by the analogue prototype and the claimed device. The results of the calculations show that for signals, Faure, the dummy analog, a prototype of the inventive device, you will need to provide the following signal/noise

qanalogue=12 dB;

qprototype=8 dB;

qAppl. device.=6,907 dB.

Therefore, the gain on the signal-to-noise ratio from the use of signals generated by the claimed device, in comparison with similar amounts 5,093 dB as compared with the prototype is 1,093 dB.

The use of the invention allows to create generating equipment for multi-channel communication systems, radio communications, radar, capable of forming a signal having high noise immunity and advanced applications.

Device for the formation of discrete orthogonal multilevel signals containing the master oscillator, frequency divider, the power generation of the Walsh function, three groups of multipliers, the element is NOT, the switch, and the output of the master oscillator is connected to the input of the frequency divider, the output of the frequency divider is connected to the clock input of the processing unit of the Walsh function, to the first input of each multiplier of the first group via element, NOT to the first input of each multiplier of the second group, the yield of the i-th (i=0, 2n-1) the functions of the Walsh block the formation of the Walsh function is connected to the first input of the first multiplier of the third group, the output of the second Walsh function block formirovanii Walsh connected to the control input of the switch, output (2n-1)-th Walsh function block formation of the Walsh function is connected to the information input switch, output switch connected to the second inputs of all multipliers of the third group, the output of the i-th multiplier of the third group are connected to second inputs of the i-x multipliers of the first and second groups, the outputs of the multipliers of the first and second groups are the outputs of the device, characterized in that it introduced two blocks forming control signals and amplifiers with variable gain, and outputs the i-x multipliers of the first and second groups are connected to the inputs of the i-x amplifiers with variable gain, clock inputs blocks forming control signals connected to the output of the frequency divider, i-e the outputs of blocks forming control signals are connected to the i-th control inputs of amplifiers with variable gain, the outputs of the amplifiers with variable gain are the outputs of the device.



 

Same patents:

The invention relates to automatic control and computer engineering

The invention relates to automation and computer engineering and can be used to generate linearly independent functions

The invention relates to automatic control and computer engineering and is intended to generate orthogonal signals

The invention relates to automation and computer engineering and can be used in stochastic functional converters, stochastic computing devices in a probabilistic modeling and stochastic data processing

The invention relates to automatic control and computer engineering

The invention relates to automatic control and computer engineering and can be used in the devices of spectral analysis and communication to generate orthogonal signals

The invention relates to automation and computer engineering and can be used to create a generator equipment multi-channel communication systems

The invention relates to automation and computer engineering and can be used to create a generator equipment multi-channel communication systems

The invention relates to automatic control and computer engineering and can be used to build generators systems discrete orthogonal signals

The invention relates to automatic control and computer engineering

FIELD: electricity.

SUBSTANCE: random sequences generator relates to computing processes, in particular, to discrete sequences generators and may be used in digital computers, TV, telecommunication systems, in generation of the orthogonal address sequences, as well as in the data protection systems. The said generator consists of the clock pulse generator, NO-component, n-digit counter, two AND-components, one shift register, function number register and trigger. The generator incorporates the units of generation of producing sequence, the key and the module 2 adder.

EFFECT: wider functions of the Wolsch function generator thanks to possibility of generation of random sequences.

2 cl, 2 dwg, 3 tbl

FIELD: automatics and computer engineering, in particular, devices for forming discontinuous orthogonal multi-level signals, possible use for creating generator equipment of multi-channel communication systems.

SUBSTANCE: device consists of set-point generator (1), frequency divider (2), Walsh function generation block (3), multiplexers (5) of first and second groups, multiplexers (6) of third group, (4) NOT element, commutator (7), blocks (8) and (9) for generating control signals and amplifiers (10) with alternating amplification coefficient.

EFFECT: increased interference resistance of generated discontinuous orthogonal multi-level signals.

5 dwg, 4 tbl

Functions generator // 2277718

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

FIELD: automatics and computer science, possible use in information compression equipment in television, multi-channel communications, telemetry for representing varying messages and signals in Walsh basis.

SUBSTANCE: generator has set-point element, NOT element, shift register, function number register, AND element, trigger, n-digit counter and additional AND element.

EFFECT: simplified generator due to decreased number of triggers, used as shift register digits.

3 dwg, 4 tbl

FIELD: radio engineering, possible use for construction of equipment for forming current in underground or underwater current ducts.

SUBSTANCE: negatively reversed connection is inserted between load and output cascade of generator, also, overcharge protection circuit is provided. To increase reliability of generator, temperature sensor is provided, mounted in radiator of output cascade, and temperature sensor, mounted on power block of output cascade, central microprocessor unit controls generator in a way not to allow overheating of output cascade and exceeding of voltage or current limiting values.

EFFECT: higher precision of resulting current and higher operational reliability of generator.

1 dwg

FIELD: communication systems.

SUBSTANCE: method includes generating sets of sub-codes of quasi-additional turbo-codes with given encoding speeds, and given sub-codes are reorganized as a set of sub-codes with another encoding speed for use in next transfer of sub-code with given encoding speed.

EFFECT: higher efficiency.

9 cl, 13 dwg

The invention relates to computing and can be used in static studies and systems for information processing

The invention relates to the field of computer engineering and can be used in communication systems

The invention relates to automation and computer engineering and can be used in communication systems employing digital methods for the formation of large systems of complex signals

The invention relates to a device for comparing two complex vector quantities in real time and can be used for the formation of non-stationary signals

FIELD: communication systems.

SUBSTANCE: method includes generating sets of sub-codes of quasi-additional turbo-codes with given encoding speeds, and given sub-codes are reorganized as a set of sub-codes with another encoding speed for use in next transfer of sub-code with given encoding speed.

EFFECT: higher efficiency.

9 cl, 13 dwg

Up!