Apparatus for forming a system of discrete orthogonal signals

 

(57) Abstract:

Apparatus for forming discrete orthogonal system of functions applies to automatics and computer engineering and can be used to build generators systems of discrete signals. The purpose of the invention is the simplification of the device for the formation of discrete orthogonal functions. The device contains a clock generator, the block of formation of system of Walsh functions, ordered by Adamaru, group multiplier products and unidirectional key. 4 Il.

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

Known generator of the Walsh function, containing the master oscillator and the power generation of the Walsh function [1].

However, the signals generated by this generator, have poor spectral and correlation properties as the number of blocks most of the Walsh function (with the exception of two functions is different from the optimal number of blocksopt= , where N = 2n- the number of the Walsh function in the system.

The closest in technical essence to the invention is a device for the formation of the Walsh function, the set of system functions, Hadamard, group multiplier products and switching unit, and the output of the clock generator is connected to the clock inputs of the blocks forming systems functions Walsh and Hadamard transform, the i-th output block of formation of the system of the Walsh function is connected to the first inputs of the i-th and (n+i)-th multiplier products group, the first and second information inputs of the switching unit is connected to the outputs of the shaping unit system functions, Hadamard, the control input of the switching block connected to the output of the second function block forming system of the Walsh function, the first output of the switching block connected to the second inputs of the first through n-th multiplier products group, the second output of the switching unit to the second inputs of the (n+1) th to 2n-th multiplier products group, the outputs of the multiplier products of the group are the outputs of the device [2].

The specified device generates signals with the best spectral and correlation properties as the number of blocks of each function is equal to N/2 or N/2+1, which is close to the optimal number of blocksopt= , where N = 2nis the number of functions in the system.

However, this device has considerable complexity, since it consists of the set of system functions ADSA simplification of the device for the formation of discrete orthogonal functions.

The aim is achieved in that in the apparatus for forming discrete orthogonal system of functions, containing a clock generator, the block forming system of the Walsh function and the multiplier products, and the output of the clock generator is connected to a clock input of the processing unit of the system of the Walsh function, the i-th (i = 0 to 2n- 1, where 2n- the number of the Walsh function) output processing unit of the system of the Walsh function is connected to the first input of the first multiplier group, the outputs of the multiplier products of the group are the outputs of the device, entered a one-way key, and the control input of the key is connected to 2n-1-th output block of formation of the system of the Walsh function, the first information input of the key is connected to the zero output of the processing unit of the system of the Walsh function, the second information input of the key is connected to the first output of the processing unit of the system of Walsh functions (functions at the outputs of the processing unit of the Walsh function organized by damaru), the output key is connected to the second inputs of all multiplier products group.

In Fig. 1 shows a structural diagram of a device for the formation of discrete orthogonal functions; Fig. 2 is a timing diagram illustrating the process of forming the inputs of the respective multiplier products; in Fig. 4 is a timing diagram of the functions generated by the proposed device.

Apparatus for forming discrete orthogonal system of functions contains a clock generator 1, block 2 forming system of the Walsh function, group 3 multiplier products, unidirectional key 4.

The device operates as follows.

Upon receipt of pulses from the output of the clock generator 1 to the input unit 2 for forming the system of Walsh functions at the outputs of block 2 are formed functions Walsh received at the first inputs of the respective multiplier products group 3.

Unit 2 has N outputs, each of which is formed corresponding to the Walsh code. The Walsh function on the outputs from zero to (N-1)-th ordered by adamaru (Trachtman A. M., Trachtman Century A. fundamentals of theory of discrete signals on finite intervals. M: Soviet radio, 1975, S. 44).

Unidirectional 4 key is a normal key, the output of which a signal is generated from the first information input, if the control input at this time, "1" comes. If the control input key enters "-1", its output signal is formed from the second information input.

n-1, ). As a result, the output of the key 4 is formed from the first information input function Wal (0,).

During the second half period of the formation of block 2 of the Walsh function on the control input key 4 comes "-1" (i.e., the second half-period of the function Wal(2n-1, ). As a result, the output of the key 4 is formed from the first information input function Wal(1,).

During the second half period of the formation of the Walsh function on the control input key 4 comes "-1" (i.e., the second half-period of the function Wal(2n-1,). As a result, the output of the key 4 is formed from the second information input function Wal(1,).

The signal generated at the output of the key 4, is fed to the second inputs of the multiplier products group 3, in which it is multiplied by a Walsh function. As a result, the outputs of group 3 multiplier products, a system of functions that are absolutely identical to the discrete system of orthogonal functions generated by the prototype. In further work the proposed device is performed as described above.

In Fig. 2 shows a temporary state of the output of the clock generator 1 (a), the zero output of block 2, kotoroe block 2, which is formed by the function Wal(4,) (g), output key 4 (d), seventh output unit 2, which is formed by the function Wal(7, ) (e), the output of the corresponding multiplier, which is formed by the function S(7,) (W).

Introducing one-way key allows to exclude from schematic block forming system functions, Hadamard and switching unit, which includes two bi-directional key, available in the schema of the prototype.

The use of the invention allows to create generating equipment with a significant simplification of its device, forming a system of functions that are absolutely identical to the discrete system of orthogonal functions generated by the prototype.

Apparatus FOR FORMING a SYSTEM of DISCRETE ORTHOGONAL SIGNAL containing a clock generator, the block forming system of the Walsh function and the multiplier products, and the output of the clock generator is connected to a clock input of the processing unit of the system of the Walsh function, the i-th output (i = 1 , where 2n- the number of the Walsh function) block the formation of the system of the Walsh function is connected to the first input of the first multiplier group, the outputs of the multiplier products of the group are the outputs of the device, characterized in that it contains tonapi Walsh, organized by adamaru, the first information input of the key is connected to the zero output of the processing unit of the system of Walsh functions, sorted by adamaru, the second information input of the key to the first output of the processing unit of the system of Walsh functions, sorted by adamaru, the output of the key - to the second inputs of all multiplier products group.

 

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