High speed data transmission using expanded bit durations in multiple parallel coded data streams

US5960032A · kind A · utility

Assignee

• The Hong Kong University of Science and Technology

Inventors

• Khaled Ben Letaief · Tseung Kwan O, CN
• Justin Che-I Chuang · Holmdel, US
• Ross David Murch · Hong Kong, CN

Key dates

• Filing date: Sep 20, 1995
• Grant date: Sep 28, 1999
• Expiry date: Sep 20, 2015

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04B7/264
• WIPO field: Telecommunications
• WIPO sector: Electrical engineering

Abstract

High-rate bit transmitted data is serial to parallel converted into low-rate bit streams in a similar fashion to multicarrier or multitone modulation. However, in contrast to the multicarrier method, each low-rate bit stream is modulated using direct-sequence spread-spectrum. By selecting the processing gain properly the total required bandwidth will be of the same order as the original high-rate data stream, thereby gaining the inherent benefit of multipath rejection without expanding the bandwidth of the original high-rate stream.