ORTHOGONAL FREQUENCY-DIVISION MULTIPLEX TRANSMISSION SYSTEM, AND ITS TRANSMITTER AND RECEIVER

WIPO Patent Application WO/1999/001956

A1

Received OFDM signals are transformed from a time domain into a frequency domain by Fourier transformation (12) to generate a vector sequence of each carrier wave in the frequency domain. Necessary dispersion pilot signals and termination pilot signals are extracted (13) from the vector sequence and divided (15) by a modulation complex vector to estimate transmission line characteristics relative to the dispersion/termination pilot signals, and the transmission line characteristics are interpolated (16) to estimate transmission line characteristics relative to the information transmission carrier wave of a synchronous detection segment. The vector sequence is delayed (17) by one symbol. The interpolation output is selected (18) in the case of the synchronous detection segment, and the delay output is selected (18) in the case of a differential detection segment. The vector sequence is divided (19) by the selected output, and the result is subjected to synchronous detection or differential detection and demodulated (20) to generate digital information. Thus, high quality demodulation and demodulation suitable for mobile reception are realized.

KIMURA TOMOHIRO
HAYASHI KENICHIRO
KISODA AKIRA
SOGA SHIGERU
KAGEYAMA SADASHI
SAITO MASAFUMI
ISHIKAWA TATSUYA
MORI HITOSHI
SASAKI MAKOTO
KURODA TORU
TAKADA MASAYUKI

PCT/JP1998/002942

January 14, 1999

June 30, 1998

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ADVANCED DIGITAL TELEVISION BR (JP)
MATSUSHITA ELECTRIC IND CO LTD (JP)
JAPAN BROADCASTING CORP (JP)

H04J11/00; H04L25/02; H04L27/26; (IPC1-7): H04J11/00

JPH04501348A	1992-03-05
JPH0888617A	1996-04-02
JPH0723072A	1995-01-24

Suzuye, Takehiko (7-2 Kasumigaseki 3-chom, Chiyoda-ku Tokyo, JP)

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