Title:
METHOD AND APPARATUS FOR ESTIMATING A FREQUENCY OFFSET
Document Type and Number:
WIPO Patent Application WO1999026338
Kind Code:
B1
Abstract:
In a communication system including at least one transmitter and at least one receiver, a frequency offset between a carrier frequency of the transmitter and a local frequency reference of the receiver is estimated. A phase difference is computed between successively collected samples of a frequency synchronization signal transmitted by the transmitter and detected by the receiver. The phase difference is added to accumulated phase differences. Phase differences of successively collected samples are computed and added to accumulated phase differences until M accumulated phase differences have been added. The sum of the M phase differences is dumped, resulting in zero accumulated phase differences. Phase differences of successively collected samples are computed, the phase differences are added to accumulated phase differences, and the sum of M phase differences is dumped until N sums of M phase differences have been dumped. The N sums of the M phase differences are added to produce the estimated frequency offset.
Inventors:
ATARIUS ROOZBEH
FRANK GEORG
FRANK GEORG
Application Number:
PCT/SE1998/002056
Publication Date:
June 24, 1999
Filing Date:
November 13, 1998
Export Citation:
Assignee:
ERICSSON TELEFON AB L M (SE)
International Classes:
H03J7/02; H04B17/00; H04L27/14; H04L27/00; (IPC1-7): H03J7/02
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