Multicarrier demodulation method and apparatus, and...

Details Multicarrier demodulation method and apparatus, and... Multicarrier demodulation method and apparatus, and...

2007-11-20

2007-11-20

Tse, Young T. (Department: 2611)

Pulse or digital communications

Systems using alternating or pulsating current

Plural channels for transmission of a single pulse train

C375S343000

Reexamination Certificate

active

10187609

ABSTRACT:
A method and apparatus for receiving a modulated signal which consists of N subcarriers containing N-L (L<N) nullcarriers and in which an effective symbol has a length T, and a frequency interval between two adjacent subcarriers of the N subcarriers is1/T. The method includes estimating an excess delay of a delayed wave, and deciding a part of the symbol regarded as a to-be-used symbol, based on the estimated excess delay, where a length of the decided part is TM/N (M<N) within the effective symbol length T which is decided so as not to contain a part of the symbol suffering from a waveform distortion caused by the delayed wave; and decomposing a complex digital signal which is quadrature-detected at sampling intervals T/N into L subcarriers by use of M samples of the signal within the to-be-used symbol part by means of a matched filter.

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Matsumoto, Wataru, et al., “A Study on Half-Symbol Scheme of OFDM Modulation”, The 23rdSymposium on Information Theory and Its Applications (SITA2000), Aso, Kumamoto, Japan, Oct. 10-13, 2000, pp. 101-104. Contains Japanese Language with an English Abstract.

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