Pulse or digital communications – Synchronizers – Synchronizing the sampling time of digital data
Reexamination Certificate
2005-06-10
2009-12-29
Ahn, Sam K (Department: 2611)
Pulse or digital communications
Synchronizers
Synchronizing the sampling time of digital data
Reexamination Certificate
active
07639767
ABSTRACT:
A method of acquiring time synchronization and supporting method for the same are provided. The present invention enables early synchronization of a receiving side with a transmitting side by avoiding time delays that may result in detecting a current preamble signal. The current preamble signal is inserted with a uniform interval to allow the receiving side to tune its time synchronization with the transmitting side or measure a signal strength in the orthogonal frequency division multiplexing (OFDM) or orthogonal frequency division multiple access (OFDMA) wireless communication system. In an OFDM or OFDMA wireless communication system, the present invention includes modulating a number of reference signals for time synchronization acquisition in a receiving side using at least one of a number of subcarriers and continuously transmitting at least one reference signal modulated by at least one subcarrier to the receiving side during at least one symbol time.
REFERENCES:
patent: 2004/0131011 (2004-07-01), Sandell et al.
patent: 0 939 527 (1999-09-01), None
patent: WO 00/77961 (2000-12-01), None
Bo et al., Symbol Synchronization Technique in COFDM Systems, IEEE, vol. 50, No. 1, Mar. 2004, p. 56-62.
Chun Jin Young
Im Bin Chul
Ahn Sam K
Lee Hong Degerman Kang & Waimey
LG Electronics Inc.
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