Matched filter for scalable spread spectrum communications systems

• US 7,280,579 B2
• Filed: 06/28/2006
• Issued: 10/09/2007
• Est. Priority Date: 09/24/2003
• Status: Expired due to Fees

• Current Assignee: Recon Dynamics LLC (Tricon Sales LLC)
• Original Assignee: S5 Wireless, Inc. (Tricon Sales LLC)
• Inventors: Prestwich, Sy, Bevan, Scott, Ostermiller, Dirk, Dobson, W. Kurt
• Primary Examiner(s): Bayard; Emmanuel
• Application Number:
  US11/427,256
• Publication Number:
  US 20060245481A1
• Time in Patent Office: 468 Days
• Field of Search: 375/130, 375133-136, 375141-153, 370/320, 370/335, 370/342, 370/441
• 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 transmitter for a spread spectrum communications system may include 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. A receiver for a spread spectrum communications system may include an RF receiver, a first matched filter receiving data from said RF receiver, a plurality of phase/frequency shifters receiving a signal from said first matched filter, a plurality of second matched filters receiving data from said plurality of phase/frequency shifters, and an equalizer/decoder receiving signals from said plurality of second matched filters.

Claims

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

an RF receiver;

a first matched filter receiving data from said RF receiver;

a plurality of phase/frequency shifters, receiving a signal from said first matched filter;

a plurality of second matched filters receiving data from said plurality of phase/frequency shifters; and

an equalizer/decoder receiving signals from said plurality of second matched filters.

2. A spread spectrum communications system, as recited in claim 1, wherein said second matched filters are correlated to a first pseudo noise source.

3. A spread spectrum communications system, as recited in claim 1, wherein a first pseudo noise source and a second pseudo noise source may be scaled to longer or shorter fixed or variable code lengths to optimize variables such as connection quality, system complexity, overall implementation cost and service “

classes”

of devices.