Patent ID: 6628738
Filing Date: 2003-09-30
Classification: H04L

Abstract:
A method to determine during a tracking mode in a multi-carrier system a clock timing error (&tgr;e) used for synchronisation purposes, said method comprising the steps of:detecting phase errors (&phgr;0, &phgr;1, . . . , &phgr;i, . . . , &phgr;N-1) for a plurality of pilot carriers, and calculating said clock timing error (&tgr;e) from said phase errors (&phgr;0, &phgr;1, . . . , &phgr;i, . . . , &phgr;N-1), wherein a share (Ai) of a phase error (&phgr;i), of said phase errors (&phgr;0, &phgr;1, . . . , &phgr;i, . . . , &phgr;N-1) in said clock timing error (&tgr;e) depends on a value (SNRi) of a transmission quality parameter measured for a pilot carrier of said pilot carriers for whom said phase error (&phgr;i) is measured, further comprising the step of calculating said clock timing error (&tgr;e) as a weighted sum of said phase errors (&phgr;0, &phgr;1, . . . , &phgr;i, . . . , &phgr;N-1) whereby said share (Ai) of said phase error (&phgr;i) equals a weight coefficient in said sum, wherein said share (Ai) is linearly proportional to said value (SNRi) of said transmission quality parameter.