Frequency tracking using inner and outer loops

US6760573B2 · kind B2 · utility

Assignee

• QUALCOMM Incorporated · US

Inventors

• Parvathanathan Subrahmanya · Sunnyvale, US
• Jeremy H. Lin · San Diego, US

Key dates

• Filing date: Oct 1, 2002
• Grant date: Jul 6, 2004
• Expiry date: Feb 20, 2023

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04B1/712
• WIPO field: Telecommunications
• WIPO sector: Electrical engineering

Abstract

Techniques for inner/outer loop tracking that is stable and provides desirable loop convergence characteristics are disclosed. In one aspect, the contribution from any one inner loop to the tracking function of the outer loop is limited, to prohibit any one received signal component from dominating the outer loop. In another aspect, the rate of outer loop tracking variation is controlled to provide inner and outer loop stability. Various other aspects are also presented. These aspects have the benefit of providing stable inner and outer loop control, as well as efficient convergence and tracking by the various loops, resulting in reduced frequency error and improved communication performance.