Orthogonal frequency division multiplexing

Details Orthogonal frequency division multiplexing Orthogonal frequency division multiplexing

1996-12-27

1999-09-21

Pham, Chi H.

Multiplex communications

Generalized orthogonal or special mathematical techniques

Quadrature carriers

370210, 370343, 370480, 370503, 375327, 375362, H04L 2732, H04L 702

Patent

active

059563184

ABSTRACT:
In an orthogonal frequency division modulation (OFDM) apparatus and method, a transmitter produces a clock and a reference signal to provide an accurate phase in modulation of a carrier. A receiver is thus able to reproduce the reference signal, even if the signal-to-noise (S/N) ratio of the carrier is poor. The OFDM method includes the steps of AM-modulating a group of digital signals with a plurality of carriers, in which a reference signal is frequency-modulated at a symbol period, combining the AM-modulated carrier and modulating the combined carrier into a main carrier, detecting the main carrier by phase-locking the frequency-modulated reproduced reference signal with the transmitted reference signal and fast-Fourier-transforming the combined carrier to demodulate the digital signal.

REFERENCES:
patent: 5444697 (1995-08-01), Leung et al.
patent: 5471464 (1995-11-01), Ikeda
patent: 5602835 (1997-02-01), Seki et al.
patent: 5608764 (1997-03-01), Sugita et al.

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