AFC in OFDM modulation by shift of a window along a reception sa

Details AFC in OFDM modulation by shift of a window along a reception sa AFC in OFDM modulation by shift of a window along a reception sa

1995-05-25

1997-01-21

Kizou, Hassan

Multiplex communications

Communication techniques for information carried in plural...

Combining or distributing information via time channels

375366, 375368, 370203, 370513, 370514, H04J 306

Patent

active

055965822

ABSTRACT:
In a receiver for an OFDM modulated transmission signal including at least one synchronizing symbol in each frame, the synchronizing symbol is located by stepwise shifting a window along a reception sample sequence to make a cross-correlation calculator (55) calculate cross-correlation values between a stored pattern produced from a pattern memory (53) and sequence portions picked up by the window, a maximum selector (57, 59) select two successive maxima of the cross-correlation values at a time interval substantially equal to a frame period, and a controllable clock generator (61-65) generate a clock sequence at the time interval for use in sampling the sample sequence. On a transmitter side, the at least one synchronizing symbol may either be preceded by a null period or be a main synchronizing symbol preceded by an auxiliary synchronizing symbol for use in roughly defining ranges in which the window should be shifted.

REFERENCES:
patent: 4291409 (1981-09-01), Weinberg et al.
patent: 4829543 (1989-05-01), Borth et al.
patent: 5313169 (1994-05-01), Fouche et al.
patent: 5406551 (1995-04-01), Saito et al.
patent: 5444697 (1995-08-01), Leung et al.
patent: 5471464 (1995-11-01), Ikeda

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