Timing misalignment estimation

Details Timing misalignment estimation Timing misalignment estimation

2005-09-27

2005-09-27

Corrielus, Jean B (Department: 2637)

Pulse or digital communications

Synchronizers

C370S503000, C327S291000, C327S141000

Reexamination Certificate

active

06950483

ABSTRACT:
Orthogonal frequency division multiplexing (OFDM) receiver embodiments of the invention provide timing misalignment estimation by calculating the intra-baud timing differential. The preferred method exploits the spectral structure of the short-preamble in that a time delay in the time-domain is manifest as a phase rotation in the frequency-domain. The timing misalignment is determined by special processing the spectral peaks of the modified short-preamble. An alternative embodiment linearly combines the two long-preamble symbols to construct a single “best estimate” long-preamble symbol. A normalized dot product of the “best estimate” long-preamble symbol and the ideal on-baud symbol is computed to obtain the magnitude of the timing misalignment. A dot product between the “best estimate” long-preamble symbol and the time derivative of the ideal on-baud sampled sequence is computed to obtain the sign of the timing misalignment.

REFERENCES:
patent: 6191906 (2001-02-01), Buch
patent: 6415004 (2002-07-01), Fujimura et al.
patent: 6600615 (2003-07-01), Ashley et al.
patent: 6654432 (2003-11-01), O'Shea et al.
patent: 6788485 (2004-09-01), Ashley et al.
patent: 2002/0094048 (2002-07-01), Simmons et al.
patent: 2002/0172187 (2002-11-01), Shalvi et al.
patent: 2003/0165027 (2003-09-01), Ashley et al.

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