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Code-hopping direct spread communication method and system based on OVSF codes

A technology of OVSF code and communication method, which is applied in the field of communication, can solve problems such as low power spectral density anti-interference, achieve the effect of improving anti-interference ability and anti-interception ability, and improving flexibility

Inactive Publication Date: 2014-02-05
WUHAN UNIV
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AI Technical Summary

Problems solved by technology

While maintaining the low power spectral density and strong anti-interference ability of conventional direct spread communication, code-hopping direct spread communication adopts a jumping direct spread code. , it will be difficult for the interceptor to obtain enough DS signals for DS code pattern analysis

Method used

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  • Code-hopping direct spread communication method and system based on OVSF codes
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  • Code-hopping direct spread communication method and system based on OVSF codes

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Embodiment Construction

[0035] Aiming at the fixity and repeatability of conventional direct spread codes, the present invention proposes a code-hopping direct spread communication based on OVSF codes, combining OVSF codes with code-hopping direct spread, utilizing OVSF codes are completely orthogonal and the spreading factor can be The characteristics of changing and the characteristics of the spreading code of code-hopping direct spreading with time hopping can not only meet the requirements of different user data rates, but also perform code-hopping spreading under the same spreading factor, making the method of the present invention anti- The interception ability and anti-phase interference ability are obviously better than the conventional code-hopping direct spread communication method.

[0036] The present invention will be further described below in conjunction with the accompanying drawings.

[0037] figure 1 It is a flow chart of signal processing at the transmitter, and the specific proce...

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Abstract

The invention provides a code-hopping direct spread communication method and system based on OVSF codes. According to data rate requirements of different users, the OVSF codes of different spreading factors serve as a spreading code block, and a code-hopping pattern is generated under the spreading factors to control hopping of spreading codes, namely, code-hopping direct spread of user data is carried out on the basis of the spreading code block. The method and system meet the rate requirements of different users by the adoption of the OVSF code spreading factors, meanwhile carry out spreading on data signals under the same spreading factor by means of code-hopping, and greatly improve anti-interference performance and an-intercept performance of code-hopping direct spread communication.

Description

technical field [0001] The invention belongs to the communication field, in particular to a code-hopping direct spread communication method and system based on OVSF codes. Background technique [0002] Since the emergence of the concept of spread spectrum communication, the direct sequence spread spectrum system has been widely used in military and civilian communications. However, the traditional direct sequence spread spectrum system mostly adopts fixed direct spread code groups, or replaces direct spread code groups within a period of time. Although the direct spread codewords in the code group used also change during transmission with the change of the signal code symbols, but the correspondence between each direct spread code and the signal code symbols is fixed, so the change of the direct spread codewords is repetitive. This kind of fixedness and repeatability makes the conventional direct sequence spread spectrum system seriously threatened by reconnaissance, inter...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/707H04J13/20
Inventor 刘郑郑建生雷莉吴越
Owner WUHAN UNIV
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