Adaptive, multi-rate waveform and frame structure for a synchronous, DS-CDMA system

US6999446B2 · kind B2 · utility

Assignee

• L-3 COMMUNICATIONS CORPORATION · US

Inventors

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

Key dates

• Filing date: Oct 26, 2001
• Grant date: Feb 14, 2006
• Expiry date: Jul 23, 2024

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04L1/0009
• WIPO field: Telecommunications
• WIPO sector: Electrical engineering

Abstract

A method is disclosed for operating a wireless communications system, such as a DS-CDMA communications system, by transmitting a waveform that includes a plurality of repeating frames each having x header training base symbols in a header training symbol field (TH) and y tail training base symbols in a tail training symbol field (TT). The frame is received and functions as one of a plurality of different types of frames depending on the content of at least TT. In the preferred embodiment the frame functions as one of a normal traffic frame, a termination frame, or a legacy frame providing backwards compatibility with another waveform. A given one of the frames includes four equal-size data fields separated by three equal-sized control fields, the header training symbol field (TH) and the tail training symbol field (TT).