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Method for interweaving extended code

A technology of spreading codes and communication methods, which is applied in multiplexing code distribution, multiplexing communication, code division multiplexing systems, etc., and can solve problems such as less energy and lower receiver sensitivity

Inactive Publication Date: 2008-02-27
VISHAY INTERTECHNOLOGY INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This non-smooth envelope allows less energy to be sent per pulse, reducing receiver sensitivity

Method used

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  • Method for interweaving extended code
  • Method for interweaving extended code
  • Method for interweaving extended code

Examples

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Embodiment Construction

[0021] The present invention provides the use of interleaved spreading codes and methods of using these codes in communication systems. The invention should not be limited to the specific examples described herein. For illustration purposes, Barker codes are used. However, the present invention also contemplates the use of other types of spreading codes, especially those that provide the desired autocorrelation properties.

[0022] By studying the relationship between the Barker sequence and its mirror image, the inventors of the present invention observed that the two sequences alternately build on each other and destroy each other. For illustration purposes, the Barker 13 sequence is used, but any Barker sequence can be used.

[0023] Barker 13 sequence: 1 1 1 1 1 -1 -1 1 1 -1 1 -1 1

[0024] Mirrored Barker 13 sequence: 1 -1 1 -1 1 1 -1 -1 1 1 1 1 1

[0025] and: 2 0 2 0 2 0 -2 0 2 0 2 0 2

[0026] The sum of these two sequences reinforces the fact that alternately two...

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Abstract

An interwoven spreading code is formed by a stretched spreading code series at a first frequency and a mirror of the stretched spreading code series at a second frequency. The interwoven spreading code can be used to spread a baseband signal. Data can be recovered through correlation of a received signal with the interwoven spreading code. The spreading code used in forming the interwoven spreading code can be a Barker code.

Description

technical field [0001] The present invention relates to interleaved spreading codes, such as Barker codes, for pulse compression or pulse coding, such as may be used for direct sequence spread spectrum communications. Although the invention is primarily discussed in the context of direct-sequence spread-spectrum signals, the invention should not be limited to specific contexts such as Barker codes, and other spreading codes may be used in other contexts, especially where high noise low applications in signal environments. Background technique [0002] In a spread spectrum communication system, a signal occupies a bandwidth higher than the minimum necessary bandwidth for information transmission. The baseband is extended by using a code independent of the data to be transmitted. Direct sequence is a technique in which a code signal is multiplied by a data signal. The code may be a Barker code. At the receiver, the original data signal is recovered by correlating the recei...

Claims

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Application Information

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IPC IPC(8): H04J13/00H04B1/707H04J13/10H04J13/16
CPCH04J13/16
Inventor D·阿隆M·加奇特
Owner VISHAY INTERTECHNOLOGY INC
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