MATCHED FILTER FOR SCALABLE SPREAD SPECTRUM COMMUNICATIONS SYSTEMS

• US 20070291821A1
• Filed: 09/04/2007
• Published: 12/20/2007
• Est. Priority Date: 09/24/2003
• Status: Active Grant

• Current Assignee: Recon Dynamics LLC (Tricon Sales LLC)
• Original Assignee: S5 Wireless, Inc. (Tricon Sales LLC)
• Inventors: Ostermiller, Dirk, Prestwich, Sy, Bevan, Scott, Dobson, W.
• Granted Patent: US 7,539,235 B2
• Time in Patent Office: Days
• US Class Current: 375/130
• CPC Class Codes: H04B 1/7093 Matched filter type
• CPC Class Codes: H04B 2201/70703 using multiple or variable rates
• CPC Class Codes: H04B 2201/70707 Efficiency-related aspects
• CPC Class Codes: H04J 13/0022 PN, e.g. Kronecker

Abstract

A spread spectrum communications system using long, scalable PN sequences to achieve variable communication rates using a low-complexity and scalable matched filter architecture to provide a large processing gain, robust recovery of multiple devices in long reach, high ambient-noise environments.

Claims

1. A transmitter for a spread spectrum communications system, comprising:

a data source;

a first multiplier/mixer spreading data from said data source with a first pseudo noise source;

a second multiplier/mixer spreading data from said first mixer with a second pseudo noise source; and

an RF transmitter.

2. A spread spectrum communications system, as recited in claim 1, wherein said first pseudo noise source provides a variable length code sequence.

3. A spread spectrum communications system, as recited in claim 1, wherein said first pseudo noise source provides a fixed length code sequence.

4. A spread spectrum communications system, as recited in claim 1, wherein said second pseudo noise source provides a fixed length code sequence.

5. A spread spectrum communications system, as recited in claim 1, wherein said second pseudo noise source provides a variable length code sequence.

6. A spread spectrum communications system, as recited in claim 1, wherein said first multiplier mixer spreads said data from said data source with a variable length PN code.

7. A spread spectrum communications system, as recited in claim 1, wherein said first multiplier mixer spreads said data from said data source with a fixed length PN code.

8. A spread spectrum communications system, as recited in claim 1, wherein said second multiplier mixer spreads said data from said first mixer with a fixed length PN code.

9. A spread spectrum communications system, as recited in claim 1, wherein said second multiplier mixer spreads said data from said first mixer with a variable length PN code.