Spread spectrum electromagnetic signals

• US 20020172260A1
• Filed: 01/12/2001
• Published: 11/21/2002
• Est. Priority Date: 09/27/1991
• Status: Active Grant

• Current Assignee: CommWorks Solutions, LLC (IP Investments Group LLC)
• Original Assignee: Kipling Sahibs LLC (Intellectual Ventures LLC)
• Inventors: Rice, Bart F.
• Granted Patent: US 7,760,792 B2
• Time in Patent Office: Days
• US Class Current: 375/130
• CPC Class Codes: H04B 1/707 using direct sequence modulation
• CPC Class Codes: H04B 1/7075 with code phase acquisition
• CPC Class Codes: H04J 13/00 Code division multiplex systems for frequency hopping H04B1/713
• CPC Class Codes: H04J 13/0074 Code shifting or hopping
• CPC Class Codes: H04J 13/0077 Multicode, e.g. multiple codes assigned to one user
• CPC Class Codes: H04J 13/10 Code generation
• CPC Class Codes: H04J 13/102 Combining codes
• CPC Class Codes: H04J 13/16 Code allocation

Abstract

An assembly of simultaneously transmitted electrically generated signals, which contains a subset of binary spreading-code sequences that are members of a larger set of binary spreading-code sequences available to a particular node of a multi-node communication network. All sequences in the set of spreading-code sequences available to the particular node of the network can be generated by the same configuration of two linear-feedback binary shift registers, where feedback taps of the two linear-feedback binary shift registers correspond to primative polynomials of the same degree over GF(2), the field of two elements.

Claims

1. A method for generating sets of binary sequences, each set to be assigned to a corresponding node of a multi-node communication network, said method comprising combining digital output sequences from a first binary shift register with specified digital output sequences from a second binary shift register to produce a set of combined output sequences.