Title:
PREAMBLE GENERATING METHOD FOR OFDM AND MODULATION CIRCUIT FOR OFDM
Document Type and Number:
Japanese Patent JP2968962
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide an orthogonal frequency division multiplex(OFDM) preamble generating method and an OFDM modulation circuit that prevent deterioration in an error rate and detect a symbol timing at a high speed even when preamble signal for AGC is in use.
SOLUTION: In the OFDM preamble generating method that generates a burst signal including at least one automatic gain control preamble signal being an OFDM signal used for orthogonal frequency multiplex communication and two synchronizing signals in succession to the preamble signal, the preamble signal and the synchronizing signals are generated based on the same predetermined fixed pattern and a prescribed phase change is given to each latter half of either the preamble signal or the synchronizing signal so as to generate a phase difference of about 180 degrees between the phase of the preamble signal for the latter half area and the phase of a plurality of the synchronizing signals for each latter half area.
Inventors:
Kizawa, Takeshi
Mizoguchi, Masato
Sakata, Toru
Takanashi, Hitoshi
Morikura, Masahiro
Mizoguchi, Masato
Sakata, Toru
Takanashi, Hitoshi
Morikura, Masahiro
Application Number:
JP1998000232759
Publication Date:
August 20, 1999
Filing Date:
August 19, 1998
Export Citation:
Assignee:
NIPPON TELEGR & TELEPH CORP <NTT>
International Classes:
H04L27/00; H04J11/00; H04L7/00; (IPC1-7): H04J11/00; H04L7/00