公开(公告)号：US07061967B2

公开(公告)日：2006-06-13

申请号：US10179645

申请日：2002-06-24

Applicant: Jacob Schelm ,  Ophir Shabtay ,  Yaniv Avital ,  Ehud Reshef

Inventor： Jacob Schelm ,  Ophir Shabtay ,  Yaniv Avital ,  Ehud Reshef

IPC: H04B1/707

CPC classification number: H04B1/70775 ,  H04B1/70757 ,  H04B1/7113

Abstract: A method and apparatus for estimating channel tap delays of multipath components in a CDMA received signal. The search for the tap delays are split into two phases namely, a phase 1 and a phase 2 search. The phase 1 search is a coarse resolution quick search adapted to generate a rough estimate of the location of the tap delays. During this phase, the candidate codes are summed and the input signal correlated with the code sum creating an ambiguity in the code associated with the multipath. A finer resolution slower phase 2 search resolves the code ambiguity present in the initial rough estimates of the phase 1 search. Additional phase 2 correlations may be performed to implement a code-tracking loop.