Frequency offset compensation using dotting sequences

Details Frequency offset compensation using dotting sequences Frequency offset compensation using dotting sequences

1997-03-27

1999-08-31

Tse, Young T.

Pulse or digital communications

Receivers

Angle modulation

375326, 375362, 329304, H04L 2722

Patent

active

059463600

ABSTRACT:
The along and perpendicular rails of a received signal (e.g., modulated using multi-phase shift keying) are rotated to compensate for frequency offsets between the carrier frequency of the received signal and the reference frequency of the local oscillator. The rotation angles are updated, based on the rotated along rail, during dotting sequences in the received signal. In one implementation, the dotting sequences are detected based on the rotated perpendicular rail. The beginnings of dotting sequences are detected by thresholding the average on the perpendicular rail, and the ends of dotting sequences are detected by analyzing the encoded data for non-dotting-sequence values. In a cordless phone application, different dotting sequences may be used to distinguish base-to-handset transmissions from handset-to-base transmissions.

REFERENCES:
patent: 5151926 (1992-09-01), Chennakeshu et al.
patent: 5422917 (1995-06-01), Scott
patent: 5511098 (1996-04-01), Gardner

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