Device for forming discontinuous orthogonal multi-level signals

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

 

The technical field to which the invention relates.

The invention relates to automation and computing in particular to a device for the generation of discrete orthogonal multilevel signals, 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 function generator Walsh and 2n+1multiplier units, where 2n- number of outputs of the function generator Walsh (see USSR author's certificate No. 1381466, CL G06F 1/02, 1986). Also known generator of discrete orthogonal functions, contains a master oscillator, a binary divider blocks multiplication (see Dadonov N.G., Senin A.I. Orthogonal and quasiorthogonal signals. Edited Amoresano. M, Communication, 1977 - 224 C.).

However, the signals generated by these generators have a 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, whom utter, 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, 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 is 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 (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 is limited because of the side peaks in the autocorrelation functions have a great value.

Disclosure of inventions

The objective of the invention is to develop a device for the generation of discrete orthogonal multi-level 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 that can be obtained using the present invention is to increase the noise immunity of the generated discrete orthogonal multilevel signals.

The technical result is achieved by using 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 is 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 details is rmational the input of the switch, the output switch is 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, it introduced two blocks forming control signals and amplifiers with variable gain, and outputs the i-x multipliers of the first and second groups connected to the input of the i-th amplifier with variable gain, clock inputs of the blocks forming control signals connected to the output of the frequency divider, i-e the outputs of blocks forming control signals connected to i-m control inputs of amplifiers with variable gain, and 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 shaper discrete orthogonal multilevel signals, figure 2 presents the timing diagram explaining the principle of operation of the inventive device when forming the signal Z (5, Θ), figure 3 presents a view of the signals generated by the claimed device.

The implementation of the invention

Device for the formation of discrete orthogonal multilevel signal consists of a master oscillator 1, the divider 2 h is the frequency, unit 3 the formation of the Walsh function, multiplier 5, the first and second groups of tubes 6 of the third group, item 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 of each multiplier 5 of the second group, to the clock inputs of the blocks 8 and 9 forming control signals, the output 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 connected to the information 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 of the third group are connected to 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 connected to the input of the first amplifier 10 with a variable gain, i-e the outputs of blocks 8 and 9 forming control signals are connected to the i-th opravlyaushi the inputs of amplifier 10 with variable coefficient gain the outputs of the amplifiers 10 with variable gain are the outputs of the device.

Figure 2 presents the signals:

a) the output of the clock generator 1,

b) output of the divider 2 frequency

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 of the 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) input of the amplifier 10 with a variable gain, which receives signals S1(5, Θ) and S2(5, Θ), forming the signal S (5, Θ),

m) unit output 9 of the generation of control signals,

n) of the output unit 8 forming control signals,

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

when forming the signal Z (5, Θ) for the case n=3.

Similarly formed the rest of the signals presented in figure 3.

Device for the formation of discrete orthogonal multilevel signals is as follows.

Upon receipt of pulses from the output of daysago generator 1 through the divider 2 frequency at the clock input unit 3, the formation of the Walsh function, at 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 [3T/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.

In R. the result at the outputs of the multipliers 5, the first and the second group is formed simultaneously 2 n+1discrete orthogonal functions.

Since the outputs of the i-th multipliers 5, the first and second groups are connected, the generated them discrete orthogonal functions are added to each other, and then arrive at the inputs of amplifier 10 with a variable gain.

The amplifier 10 with a variable gain works in such a way that the amplification factor is changed 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 formation of the control signals is a matrix M1:

Unit 8 the formation of the control signals is a matrix M2:

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 i-x 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 coefficient of condition is of amplifier 10 with a variable gain factor depends on the combination of control signals on their control inputs, in accordance with table 1.

Table 1
The gains of the amplifiers with variable gain
The first control inputThe second control inputGain
005,5
01a 3.9
101,7
111,2

Changes in the gain of amplifier 10 with a 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 2, with respect to the signals generated by the prototype table 3.

Table 2
The values of the autocorrelation functions of the signals generated by the claimed device
№ p/pThe values of the actual signals
00-0,120,13-0,0800,130,13 -0,07
100,12-0,130,080-0,13-0,130,07
200,13-0,130,080-0,13-0,130,06
30-0,130,13-0,0800,130,13-0,06
40-0,13-0,13-0,0800,13-0,13-0,06
500,130,130,080-0,130,130,06
60-0,12-0,13-0,0800,13-0,13-0,07
700,120,130,080-0,130,130,07

Table 3
The values of the autocorrelation functions of the signals generated by the prototype (USSR author's certificate No. 1783506, CL G06F 1/02, 1992)/td>
№ p/pThe values of the actual signals
00-0,130,25-0,1300,130,250,13
100,13-0,250,130-0,13-0,25-0,13
20-0,130,25-0,1300,130,250,13
300,13-0,250,130-0,13-0,25-0,13
40-0,13-0,25-0,1300,13-0,250,13
500,130,250,130-0,130,25-0,13
60-0,13-0,25-0,130-0,13-0,250,13
700,130,250,130-0,130,25-0,13

The use of the device is of the generation of discrete orthogonal multilevel signals will allow you to create generating equipment for multi-channel communication systems, for the formation of the signals having high noise immunity, due to the decrease of the amplitudes of the side peaks of the FACTORS used signals are compared with signals generated by the analog and the prototype.

Signals generated by the analog (see USSR author's certificate No. 1381466, CL G06F 1/02, 1986), prototype (see USSR author's certificate No. 1783506, CL G06F 1/02, 1992) and the claimed device were calculated maximum lateral peaks of the autocorrelation functions. The results of the calculations are presented in table 4.

Table 4
The maximum lateral peaks of the autocorrelation functions of the signals generated by the analog (No. 1381466, CL G06F 1/02, 1986), prototype (USSR №1783506, CL G06F 1/02, 1992) and the claimed device
Indicator/UnitSimilar (No. 1381466, CL G06F 1/02, 1986)Prototype (1783506, CL G06F 1/02, 1992)The inventive device
The maximum lateral peak ACF0,93750,250,13

As follows from table 4, 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 0,8075, is in relation to the signals generated by the prototype 0,12.

Determination of the magnitude of the gain in noise signals generated by the claimed device, in relation to the signals generated by the analog and the prototype is as follows. Use a ratio relating the amount 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 of their parameters. // Radio engineering and electronics. - 1973.- No. 8 - S)

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

Determined by the relation (5) the amount of gain on the signal-to-noise ratio from the use of signals generated by the claimed device.

To assess the winnings will 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 generated by the analogue prototype and claimed the device will need to provide the following signal/noise

qanalogue= 96 dB;

qprototype= 8 dB;

qAppl. device.= 6,907 dB.

Therefore, the gain on the signal-to-noise ratio from the use of signals generated for the implemented device, compared with similar amounts 89,093 dB as compared with the prototype is 1,093 dB.

This suggests that the form of the inventive device, the signals are more robust compared to the signals generated by the analog and the prototype.

The present invention in comparison with the prototype and other known technical solutions has the advantage of creating a more robust signal by reducing the amplitude of the side peaks of the actual signals used.

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, and through the element NOT to the first input of each multiplier of the second group, the yield of the i-th (1=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 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 after inserting ucen to the information input of the switch, the output switch is 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 connected to the input of the i-th amplifier with variable gain, clock inputs of the 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, and the outputs of the amplifiers with variable gain are the outputs of the device.



 

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