Acquisition and adjustment of gain, receiver clock...

Details Acquisition and adjustment of gain, receiver clock... Acquisition and adjustment of gain, receiver clock...

2008-03-25

2008-03-25

Tran, Khai (Department: 2611)

Pulse or digital communications

Spread spectrum

Direct sequence

Reexamination Certificate

active

10738693

ABSTRACT:
The present invention discloses a method and apparatus for adjusting gain setting, receiver clock frequency, and symbol timing in an OFDM radio receiver. The method is based on the reception of a preamble with known periodic training sequences transmitted prior to user data over the radio channel. By computing a periodicity metric, an inner receiver detects the presence of periodic signals in the received data sequence, provides means to set the Variable Gain Amplifier VGA gain in the radio frontend, and estimates frequency offsets between the transmit and receive clock. Matched filters are used to determine the symbol timing. A finite-state-machine schedules various tasks during the receiver startup.

REFERENCES:
patent: 6621857 (2003-09-01), Belotserkovsky et al.
patent: 2002/0154620 (2002-10-01), Azenkot et al.
patent: 2002/0154688 (2002-10-01), Pollmann et al.
patent: 2003/0031275 (2003-02-01), Min et al.
patent: 2003/0058952 (2003-03-01), Webster et al.
patent: 2004/0246891 (2004-12-01), Kay et al.

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