Receiver which demodulates OFDM symbol

Details Receiver which demodulates OFDM symbol Receiver which demodulates OFDM symbol

2007-12-25

2007-12-25

Tse, Young T. (Department: 2611)

Pulse or digital communications

Systems using alternating or pulsating current

Plural channels for transmission of a single pulse train

C370S210000

Reexamination Certificate

active

10784437

ABSTRACT:
A receiver is disclosed that demodulates an Orthogonal Frequency Division Multiplexing (OFDM) symbol transmitted by an OFDM method. The receiver includes a delay profile generation unit that generates a delay profile regarding a preceding wave and a delayed wave included in a received signal, a demodulation unit that demodulates the received signal so as to output a demodulated signal per sub-carrier, a hard-decision unit that makes a hard decision per sub-carrier on a signal point based on the demodulated signal so as to output a hard-decision signal, a replica generation unit that uses the hard-decision signal to generate a replica signal per sub-carrier, and an inter-carrier interference suppression unit that adds a difference between the hard-decision signal and the replica signal to the demodulated signal so as to suppress an inter-carrier interference.

REFERENCES:
patent: 6928120 (2005-08-01), Zhang
patent: 2004/0091057 (2004-05-01), Yoshida
patent: 11-298434 (1999-10-01), None
Suyama, S., Hara, Y., Suzuki, H., Kamio, Y. and Fukawa, K., “An OFDM Receiver Scheme for Multipath Environments with Delay Profile over the Guard Interval,” Technical Report of The Institute of Electronics, Information and Communication Engineers, RCS 2001-175, Nov. 2001, pp. 45-50, English Abstract.
Suyama, S., Suzuki, H. and Fukawa, K., “An OFDM Receiver with Smoothed FFT-Window and RLS-MLSE for Fast Multipath Fading Environments with Large Delay Spread,” IEEE 7th International Symposium on Spread-Spectrum Techniques and Applications, Sep. 2, 2002, vol. 2, pp. 353-357.
Kim, D. and Stuber, G.L., “Residual ISI Cancellation for OFDM with Applications to HDTV Broadcasting,” IEEE Journal on Selected Areas in Communications, vol. 16, No. 8, Oct. 1998, pp. 1590-1599.
European Search Report for EP Application 04004056.0 dated Aug. 22, 2007.

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