OFDM timing and frequency recovery system

Details OFDM timing and frequency recovery system OFDM timing and frequency recovery system

1999-01-26

2000-02-01

Horabik, Michael

Multiplex communications

Generalized orthogonal or special mathematical techniques

Particular set of orthogonal functions

370210, 370207, 370203, 370206, 375326, 375344, 375260, G01R 3108, G06F 1100, H04K 100, H04L 2714

Patent

active

060211105

ABSTRACT:
A synchronizing apparatus for a differential OFDM receiver that simultaneously adjust the radio frequency and sample clock frequency using a voltage controlled crystal oscillator to generate a common reference frequency. Timing errors are found by constellation rotation. Subcarrier signals are weighted by using complex multiplication to find the phase differentials and then the timing errors. The reference oscillator is adjusted using the timing errors. Slow frequency drift may be compensated using an integral of the timing error. Frequency offset is found using the time required for the timing offset to drift from one value to another.

REFERENCES:
patent: 5206886 (1993-04-01), Bingham
patent: 5596582 (1997-01-01), Sato et al.
patent: 5682376 (1997-10-01), Hayashino et al.
patent: 5802117 (1998-09-01), Ghosh
patent: 5812523 (1998-09-01), Isaksson et al.

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