Synchronisation in a receiver

Pulse or digital communications – Receivers – Particular pulse demodulator or detector

Reexamination Certificate

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Details

C375S260000

Reexamination Certificate

active

07616716

ABSTRACT:
A radio receiver is suitable for use in an OFDM wireless communications system, in which it is necessary to identify a timing point at a start of a frame. In order to ensure optimum performance of the receiver in multipath environments, it should be synchronised with the first received multipath component, although one or more of the delayed multipath components may be stronger than the first component. A method of determining the time position of the first received multipath component, determines a correlator function from the received signal, and determines the required timing point from a falling edge in a derivative of the correlator function.

REFERENCES:
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EPO Search Report for Int'l Application No. EP05255310, dated Jan. 24, 2006, 6 pages.
GB Examination Report for Int'l Application No. GB0419399.1, dated Jun. 25, 2008.
Van de Beek et al., “ML Estimation of Time and Frequency Offset in OFDM Sytems,” IEEE Transactions on Signal Processing, vol. 45, No. 7, Jul. 1997, pp. 1800-1805.

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