SU1711159A1 - Generator of pseudorandom signals - Google Patents

Abstract

The invention relates to computing and can be used to simulate stochastic signals in information transmission systems. The purpose of the invention is to expand the class of generated pseudo-random analog signals. The generator contains a clock pulse generator, a generator of nonlinear pseudo-random sequences, a block of binary digital-analog converters, and logic circuits containing AND elements and modulo-two adders. The purpose of the invention is achieved by the introduction of a block of binary analog-to-analog converters and logic circuits with appropriate links. 4 il.

Description

The invention relates to computing and can be used to simulate stochastic signals, in information transmission systems with correlation multiplexing and separation of communication channels.

The purpose of the invention is to expand the class of generated pseudo-random analog signals. v4

Figure 1 shows the block diagram of the generator; figure 2 - block diagram of the generator of nonlinear sequences; FIG. 3 is a logic circuit; figure 4 - diagram of the signals at the output of the generator.

The pseudo-random signal generator includes a clock pulse generator 1, a generator of 2 non-linear sequences, the n inputs of the type of generated sequence of which are the same input of a pseudorandom generator 3, a block of 4 digital-to-analog converters whose outputs form output 5

generator, logic circuits 6, which include (n-1) adders 7 modulo two and n elements And 8.

Generator 2 of nonlinear sequences contains an n-bit shift register, consisting of flip-flops 9, n elements And 10, n adders 11 modulo two, and element I / 1-HE 12.

The generator works as follows.

At each cycle of operation, when the next clock pulse transitions, the generator 2 of nonlinear sequences forms the next pseudo-random binary number on its bit outputs. Generator 2 functions as a pseudo-random sequence generator using a shift register with non-linear feedback defined by

Xl (t + 1) ClXl (t) (t) € ... © CnXn (t) ©

 (xi (t) © 1) - §Oxi (t) © n (xi (t) © 1), (1)

i 1i 11 1

(L

WITH

SL

about

where xi (t) is a code value (0) defined by the state of the 1st (J fTn) trigger 9 register at the discrete time point t;

xi (t + 1) feedback signal value written to (1 + 1) th. point in time in the first register trigger;

® 2) ® modulo-two sign ,.

The operator (T) is implemented by a logical system consisting of n elements And 10, n adders 11 modulo two and an element OR-NN 12. The generator 2 for 2P operation cycles turns out in all possible 2P states; including the state when all the triggers 9 are at zero. Given different coefficients Ci (i Vi, Cj 0 or 1), one can obtain various pseudo-random sequences of the period 2P. The signals from the discharge outputs of the generator 2 are fed to the first g inputs of the block 4 binary digital-to-analog converters in accordance with the formula

di xi; I 1, n,

where di is the signal at the i-th input of block 4 at this cycle of operation of the pseudorandom signal generator

The remaining input signals of block 4 are formed by logic circuits 6 and in accordance with the formula

dn + j -. J FSN-uidj + M; j - t, 2n-n + 1. (2)

J - J.Operator (2) is realized with the help of p-elements AND 8 and (p-1) adders 7 modulo two, Block 4 of binary digital-to-analog converters generates an analog signal A And with di 1 and ij -A with df 0 (i 1, p). Ultimately, the generator output generates a set of signals g), forming a complete system of orthogonal signals, each of which has the pseudo-privacy property. Figure 4 presents the diagram of the generated signals for the particular case: p 4; Ci С2 0: Сз С4 1.

Claims (1)

Formula of the invention Pseudo random signal generator containing a generator of nonlinear sequences and a clock pulse generator, the output of which is connected to a clock input of a generator of nonlinear sequences, n (where n 1,2 ...) of the inputs of specifying the type of generated sequence of which is the same input of a pseudorandom signal generator, with what In order to expand the class of generated pseudo-random analog signals, a block of binary digital-analog converters () of groups of n elements And And) groups of (n-1) are introduced modulo-two adders, with the k-th (k 1, p) discharge output of the generator of nonlinear sequences connected to the k-th input of the binary digital-to-analog converter unit and to the first input {n-k +) - ro of the element AND 1st group (, n, k I), the second input of k-ro (k 1, n) of the element AND of each group is connected to the k-th input of specifying the type of generator generated sequence, the output of the first element And each group is connected to the first input of the first adder modulo the corresponding group, the output i-ro (i 2, p) of the element And each group is connected to the second input (i-i) -ro of the modulo adder two of the same group, the output of which is coev dinin with the second input of the 1st adder modulo two of the same name group, output fп-1 of the U-th adder modulo two j-th group (j 1,2 nn-T) connection () m entrance block of digital-to-analog converters, the outputs of which form the generator output, the first input of the k-ro element And the J-th group is connected to the output of the n-th modulo two (j-k) -u group (| -1). but. one. FIG. / / 7- / L7 2 2 / fa 2i f In 1I I // / 2 fft-t In FIG. J i i i i i 1111 111 i and L-P-fid t V2 YYYY f period 111 111 i and LPP-fid M Z-A П П П-j time year