Multiplex communications – Generalized orthogonal or special mathematical techniques
Patent
1996-09-24
1999-12-28
Ton, Dang
Multiplex communications
Generalized orthogonal or special mathematical techniques
370281, 370343, 370480, 375261, 358432, H04J 1100
Patent
active
060090731
ABSTRACT:
Each of a plurality of carrier waves is modulated with one of information signals for each symbol, one of two types of reference signals known on a receiving side is alternately inserted into a pair of particular carrier waves of which frequencies are symmetric to each other with respect to a frequency of a central carrier wave for each symbol while changing the frequencies of the pair of particular carrier waves at two symbol intervals to insert the reference signal into all carrier waves every prescribed symbols, a symbol number is inserted into one carrier wave to specify the pair of particular carrier waves, and an orthogonal frequency division multiplex (OFDM) signal composed of the modulated carrier waves are transmitted from transmitting apparatus to a receiving apparatus through a spatial transmission path. In the receiving apparatus, the OFDM signal is demodulated, two types of reproduced reference signals are obtained, a characteristic of a transmission path including the spatial transmission path and transmission characteristics of the transmitting and receiving apparatuses is detected by comparing the reproduced reference signals and the reference signals, a correcting equation is calculated, and each modulated information signal is reproduced according to the correcting equation. Accordingly, the reproduced information signals can be obtained with a high accuracy without complicating the configuration of the transmitting and receiving apparatuses.
REFERENCES:
patent: 4882614 (1989-11-01), Kageyama et al.
patent: 5646935 (1997-07-01), Ishikawa et al.
patent: 5790514 (1998-08-01), Marchok et al.
patent: 5822323 (1998-10-01), Kaneko et al.
Hom Shick
Ton Dang
Victor Company of Japan Ltd.
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