Method of slip compensation for integer frequency offset...

Details Method of slip compensation for integer frequency offset... Method of slip compensation for integer frequency offset...

2007-03-06

2007-03-06

Tran, Khai (Department: 2611)

Pulse or digital communications

Receivers

Interference or noise reduction

C375S350000, C370S482000

Reexamination Certificate

active

10438243

ABSTRACT:
A method of correctly estimating the frequency offset when the CPE modem has already acquired and is tracking the OFDM burst boundaries in an OFDM-based, wireless communication system. CPS data in an OFDM-based, wireless communication system is modulated as QPSK data in the training tones of the data burst. As long as some bursts have the CPS data modulation and some bursts do not have the CPS data modulation, the CPS data can be recovered. A slip results when there is a linear phase difference across the tones (after the FFT) between the current and the previous burst. This linear phase difference is generally taken care of by the channel estimation obtained using the pilot tones. This phase difference is however, now compensated for correct frequency offset estimation which occurs before the channel estimation and CPS decoding steps.

REFERENCES:
patent: 5812523 (1998-09-01), Isaksson et al.
patent: 6226337 (2001-05-01), Klank et al.
patent: 6996156 (2006-02-01), Ono

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