Multiplex communications – Generalized orthogonal or special mathematical techniques – Quadrature carriers
Patent
1995-12-14
1997-10-28
Hsu, Alpus H.
Multiplex communications
Generalized orthogonal or special mathematical techniques
Quadrature carriers
370210, 370484, 375260, H04J 1100, H04L 2728
Patent
active
056823762
ABSTRACT:
A complex multiplier complex-multiplies a carrier modulation signal group for decoding the phases and amplitudes of a plurality of carriers which are orthogonal to each other on the frequency axis by a complex signal group having a predetermined specific pattern which varies in phase at random. An inverse Fourier transformer performs inverse Fourier transformation on an output of the complex multiplier, for transforming a digital signal which is multiplexed on the frequency axis to an OFDM signal on the time axis. A guard interval insertion part adds front and rear guard intervals to front and rear parts of each symbol of the OFDM signal respectively. The front and rear guard intervals include data which are identical to those of rear and front end parts of the corresponding symbol respectively. Arithmetic processing which is reverse to that on a transmission side is performed on a receiving side, whereby distortion of received data is removed. Thus, the OFDM signal can be transmitted with no waveform distortion on a data component of each symbol on the frequency axis after Fourier transformation even if a reflected wave is superposed on a direct wave due to a multipath.
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"Suitable for Mobile Receiving of OFDM Broadcasting Employing at Least Hundreds of Carriers", Hajime Fukuchi, Communications Research laboratory, The Ministry of Posts and Telecommunications of Japan, Data Compression and Digital Modulation, Nikkei Electronics Books, Oct. 1, 1993, pp. 207-222.
Harada Yasuo
Hayashino Hiroshi
Kimura Tomohiro
Oue Hiroshi
Uno Yasuhiro
Hsu Alpus H.
Matsushita Electric - Industrial Co., Ltd.
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