Method of transmitting orthogonal frequency division multiplexin

Details Method of transmitting orthogonal frequency division multiplexin Method of transmitting orthogonal frequency division multiplexin

1995-12-29

1998-06-30

Marcelo, Marvin

Multiplex communications

Generalized orthogonal or special mathematical techniques

Quadrature carriers

370208, 370210, 370515, 375368, H04J 1100, H04L 2734

Patent

active

057744505

ABSTRACT:
An orthogonal frequency division multiplexing signal transmitted from the transmitting end to the receiving end intermittently includes a particular symbol S0 having a predetermined particular pattern in addition to a symbol Sm including data to be transmitted. At the receiving end, the variation in the receiving level and/or the variation in the frequency band of a received signal are detected and corrected on the basis of the received particular symbol S0. Since the particular symbol S0 has a particular pattern, the variation in the level and/or the variation in the frequency are strongly correlated with the variation in the receiving level and/or the variation in the frequency band of the received signal. Consequently, the variation in the receiving level and/or the variation in the frequency band of the received signal can be accurately detected from the particular symbol S0 and consequently high-precision correction can be made.

REFERENCES:
patent: 5228025 (1993-07-01), Le Floch et al.
patent: 5406551 (1995-04-01), Saito et al.
patent: 5596582 (1997-01-01), Sato et al.
patent: 5682376 (1997-10-01), Hayashino et al.
Nikkei Electronics, "Next Generation Home Service Exceeds Television", No. 574, pp. 101 to 124, Feb. 15, 1993.
Masanori Saito in NHK Science and Technical Research Laboratories, "OFDM System and Its Development", pp. 1 to 15 in materials of EIAJ Technical Seminar, Sep. 14, 1994.

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