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Pseudorandom sequence generating method

A pseudo-random sequence and sequence technology, which is applied in the field of pseudo-random sequence generation, can solve the problems of small range and low precision, and achieve the effect of improving the accuracy of ranging and reducing the difficulty of analysis.

Inactive Publication Date: 2016-06-08
上海果路交通科技有限公司
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Problems solved by technology

[0005] The invention provides a pseudo-random sequence generation method to solve the problems of small range and low precision in the existing pseudo-random sequence generation method

Method used

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Embodiment Construction

[0014] In order to describe the technical solution of the above invention in more detail, specific examples are listed below to demonstrate the technical effect; it should be emphasized that these examples are used to illustrate the present invention and not limit the scope of the present invention.

[0015] A method for generating a pseudo-random sequence provided by the present invention, the pseudo-random sequence includes an internal sequence and an external sequence formed by compound links, the generation method is as follows: first, detect the information code value collected or input by the user, and set Take the value of the external sequence, then determine the internal sequence type used according to the value of the external sequence and the value of the information code, and finally, concatenate each internal sequence, the internal sequence is a Walsh function sequence, and the external sequence is an m sequence. In the present invention, through the composite link...

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Abstract

The invention relates to a pseudorandom sequence generating method. The pseudorandom sequence comprises internal sequences and an external sequence formed by composite connection. The generating method comprises the following steps: detecting the information code value collected or input by a user and setting the external sequence value; determining the adopted internal sequence type according to the external sequence value and the information code value; and finally, connecting the internal sequences in series, wherein the internal sequence is a Walsh function sequence, and the external sequence is an m sequence. In the invention, through the composite connection between the internal sequences and the external sequence, a long-cycle pseudo-code sequence can be used for distance measurement without reducing the information rate; and meanwhile, the resolving difficulty of a receiving end is reduced, and the distance measurement precision is improved.

Description

technical field [0001] The invention relates to a method for generating a pseudo-random sequence. Background technique [0002] Pseudorandom code (PseudoRandomCode), also known as pseudonoise code (PseudoNoiseCode), referred to as PN code, is a periodic code that can be artificially generated and copied. In short, a pseudorandom code is a code sequence with white noise-like properties. [0003] The m-sequence is the abbreviation of the maximum length linear feedback shift register sequence, which is a kind of pseudo-random sequence and has excellent autocorrelation function. Because the m-sequence is easy to generate and replicate, it is often widely used to spread baseband signals in direct spread spectrum communication systems. When the code rate of the pseudo-random sequence is constant, the longer the period of the pseudo-random sequence, the larger the ranging range, but increasing the period length of the pseudo-random code sequence will reduce the rate of the inform...

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Application Information

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IPC IPC(8): H04L9/06H04B1/707
CPCH04L9/0662H04B1/707
Inventor 曾小清沈拓袁志鹏边冬林海香
Owner 上海果路交通科技有限公司
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