Two-dimensional channel bonding in a hybrid CDMA/FDMA fixed wireless access system to provide finely variable rate channels

US7190683B2 · kind B2 · utility

Assignee

• L-3 COMMUNICATIONS CORPORATION · US

Inventors

• Thomas R. Giallorenzi · Riverton, US
• Eric K. Hall · Sandy, US
• Richard B. Ertel · Midvale, US
• Philip L. Stephenson · Salt Lake City, US
• Dan M. Griffin · Bountiful, US
• Lee A Butterfield · Jordan, US

Key dates

• Filing date: Apr 9, 2001
• Grant date: Mar 13, 2007
• Expiry date: Jun 9, 2023

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04B7/2621
• WIPO field: Telecommunications
• WIPO sector: Electrical engineering

Abstract

A communications system employs the use of both synchronous CDMA and FDMA to provide a variable bandwidth waveform with multiple bonded transmitters and receivers that are agile in both frequency and PN code to permit a variable bandwidth and variable rate multiple access system. In a first aspect the teachings provide the use of both CDMA and FDMA together to enable an improved concentration efficiency by making a larger pool of bandwidth available to each user. In a second aspect these teachings enable channel bonding across both code space and frequency space, thus making the system capable of operating within a variable (not necessarily contiguous) bandwidth and at a finely variable rate.