Improvement of delay locking ring or related to delay locking ring

Application Number: 00108151
Application Date: 2000.04.29
Publication Number: 1272724
Publication Date: 2000.11.08
Priority Information: 1999/4/29 GB 9909827.9
International: H03L7/08;H04J13/00
Applicant(s) Name: Roke Manor Research Ltd.
Inventor(s) Name: P. Qianbers;A. P. Herbert
Patent Agency Code: 72001
Patent Agent: chen ji
Abstract Described herein is a method and apparatus for providing improved delay lock loops. In Code Division Multiple Access (CDMA) systems using orthogonal codes, the energy values measured at the 'Early' and 'Late' positions respectively increase and decrease as the timing moves from the 'Prompt' position to these positions due to the degree of orthogonality of other codes present in the signal. By despreading the 'Early' and 'Late' signals with respect to an 'Absent Code', taken from the set of orthogonal codes for the CDMA system, which is never transmitted, an improved loop is provided.