Dual code spread spectrum communication system

a communication system and dual-code technology, applied in the field of direct sequence spectrum spreading (dsss) communication systems, can solve the problems of difficult acquisition without advance, rendering isolation and reception of input signals difficult without advance, and signal cannot be reconstituted nor detected
US20080151968A1Inactive Publication Date: 2008-06-26THE AEROSPACE CORPORATION
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
THE AEROSPACE CORPORATION
Publication Date
2008-06-26
Estimated Expiration
Not applicable · inactive patent

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Abstract

A direct sequence spread spectrum receiver includes a first spreading code generator for receiving a first channel signal spectrum spread by a first spread code, while a second group of receivers use a second spreading code, where the first and second codes are partially correlated, so that, the first group of receivers receive all messages communicated while the second group of receivers only receives a portion of the messages. In this manner, a spread spectrum broadcast system can selectively communicate to a selected portion of receivers in a whole group of receivers by simply switching the spreading code at the transmitter.
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Description

STATEMENT OF GOVERNMENT INTEREST

[0001] The invention was made with Government support under contract No. F04701-00-C-0009 by the Department of the Air Force. The Government has certain rights in the invention.FIELD OF THE INVENTION

[0002] The invention relates to the field of direct sequence spectrum spreading (DSSS) communications systems. More particularly, the present invention relates to DSSS communications for selectively communicating from a transmitter to a select portion of a group of receivers using switched spreading codes.BACKGROUND OF THE INVENTION

[0003] Spread spectrum communication systems use direct sequence spread spectrum (DSSS) codes for spectrum spreading channel signals communicated over respective communication channels and over a common channel bandwidth. Prior to transmission, an input signal having a narrow frequency spectrum, is spectrum spread by mixing the input signal with the DSSS code for providing a spread spectrum channel signal that has a spread spectrum...

Claims

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