Buffer-based GPS and CDMA pilot searcher

US7649860B2 · kind B2 · utility

Assignee

• QUALCOMM Incorporated · US

Inventors

• Inyup Kang · San Diego, US
• Christopher Patrick · San Diego, US
• Bruce R. Meagher · San Diego, US
• Shimman Arvind Patel · San Diego, US
• Tao Li · San Diego, US
• Joseph Cheung · San Diego, US
• Pillappakkam Srinivas · San Diego, US
• Gregory Foerster · San Diego, US
• Srinivas Varadarajan · Savanuru, IN
• Jian Wei · Zhejiang, CN

Key dates

• Filing date: Jan 31, 2002
• Grant date: Jan 19, 2010
• Expiry date: Aug 13, 2026

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04B2201/70709
• WIPO field: Telecommunications
• WIPO sector: Electrical engineering

Abstract

A pilot searcher for CDMA and GPS signals. In one aspect, the searcher is operated in conjunction with a sample buffer in a “real-time” or “off-line” mode. The writing/reading of samples to/from the buffer may be performed in a TDM manner via a common port, and samples may be decimated and packed prior to storing in the buffer. In another aspect, the overall search for pilots is partitioned into a number of tasks, with each task corresponding to a search over a given sample segment and based on a particular set of parameter values. The tasks may be stored in a queue and performed one at a time based on their order in the queue. Prior to performing a new task, the parameter values for that task is downloaded to a set of configuration registers. The parameters may be ordered and linked such that only new values are downloaded.