The generator system of discrete orthogonal signals

 

(57) Abstract:

The generator system of discrete orthogonal signals refers to the automation and computer engineering and can be used in the devices of spectral analysis and communication to generate orthogonal signals. The purpose of the invention is the simplification of the generator. The generator system of discrete orthogonal signal contains a clock generator, a counter, m-1 cyclic 2ibit shift registers (2mthe dimensionality of the system signals Haar formed on the first bit output of the counter and the outputs of the multipliers of the first group, the number of cyclic shift register), 2m-2 tubes of the first group, 2m-1 pairs of multipliers of the second group, 2m-1 multipliers of the third group, four of the limiter level of the signals of the elements and NOT the multiplier. 3 Il.

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 aim of the invention is the simplification of the generator through the elimination of 2m-1 multipliers of the third group.

In Fig. 1 shows a block diagram of the generator system thesis is TOabout(1)() and Lo(1)(a) the proposed generator of Fig. 3 - type of signals generated by the proposed generator.

The generator system of discrete orthogonal signals includes a clock generator 1, a counter 2, a cyclic registers 3 shift multipliers 4 of the first group, the first and second limiters 5.1 and 5.2 level signals, multipliers 6 of the second group, the multipliers 7 of the third group, the item is NOT 8, the third and fourth terminators 9.1 and 9.2 level signals, the multiplier 10.

The generator works as follows.

In the initial state, the counter 2 is reset to zero, and in the cyclic registers 3 shift codes recorded species 1000...0. Under the action of the clock pulses coming from the output of the generator 1, the outputs of the m high-order bits (m+1)-bit counter 2, a system of signals Rademacher, represented by level 1. The formation of subsets of signals from the corresponding Haar signals Rademacher using registers 3 shift and associated subgroups multipliers 4 of the first group. The bit width of the shift register 3 and the number of multipliers 4 in the subgroup is equal to the number of signals Haar in the subset (2iwhere i is the number of subsets). In registers 3 cyclically shifted code VI the poison is called every change of the sign of the signal Rademacher on the shift input of the register 3. The result of multiplication of the signals Rademacher with intervals of existence on the outputs of the multipliers 4 of the first group is formed, the system signals Haar. The resulting signals Haar received at the first inputs of respective multipliers 7 of the third group. However, the number of multipliers 7 in the proposed generator is equal to 2m-1, i.e., two times less than in the prototype, which consists of 2m+1-2 multipliers 7.

During the period of the signal Haar signalabout(1)() generated on the first bit output of the counter 2, is fed to the input element 8. The inverted signal Haarabout(1)() with its output fed to the input of the third limiter 9.1 level signals. Simultaneously to the input of the fourth limiter 9.2 signal level signal Rademacher m-th bit output of counter 2. The limiter 9 is implemented as a diode so that the output of the third limiter 9.1 appears positive part of the inverted signal Haar about(1)(), and the output of the fourth limiter 9.2 a negative part of the signal Rademacher, coming from the m-th bit output of counter 2. Because at the first sign Omnitel the El 9.2, the output of multiplier 10 is formed by a sequence of negative pulses, located on the second half-period of signal Haar. This sequence of negative pulses supplied to the second inputs of all of the multipliers 7 of the third group, the first input of which receives the appropriate signals Haar. In the result of multiplying the outputs of the multipliers 7 third group signals are formed, the shape of which is different from the waveforms Haar.

The signals from the outputs of the multipliers 7 of the third group are received at the first inputs of respective pairs of tubes 6 of the second group. The signal HC from the output of the (m+1)-th digit of the counter 2 is supplied to the inputs of the first and second limiters 5.1 and 5.2 level signals. Limiters 5 can be implemented as diodes so that at the output of the limiter 5.1 appears positive part of the signal Rademacher, and the output of the limiter 5.2 - negative part of the signal Rademacher.

The result of multiplication of the signals from the outputs of the multipliers 7 of the third group of the output signals of the limiters 5 on the outputs of the respective pairs of tubes 6 of the second group are formed signals2(k)() and L2(k)(a) fully and tocorrelation functions, that significantly increases the immunity of the generator.

In Fig. 2 shows the temporal state of the outputs of the clock generator 1(a), (m+1)-th digit of the counter 2(b), the first limiter 5.1 signal level (in), the second limiter 5.2 level signals (g), the first digit counter 2, which is formed by the signal Haarabout(1)(a) received at the first input of the corresponding multiplier 7 of the third group (d), item NO 8, on which is formed an inverted Haar (e), third limiter 9.1 level signal (W), m-th digit of the counter 2 (C), the fourth limiter 9.2-level signals (and), multiplier 10 (th), the corresponding multiplier 7 of the third group, at the first input of which receives the signal Haar about(1)() (), the first multiplier 6 of the second group, on which is formed a signalabout(1)( ) (l), the second multiplier 6 of the second group, which is formed by the signal Lo(1)( ) (m).

It is evident from Fig. 3 it can be seen that the signals generated by the proposed generator, completely identical to the signals generated by the prototype.

The use of the invention allows to significantly simplify the generator through the elimination of 2m-1 multipliers of the third group.

 

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