Method of reducing inter-subcarrier interference in...

Details Method of reducing inter-subcarrier interference in... Method of reducing inter-subcarrier interference in...

2003-02-12

2009-06-02

Ngo, Ricky (Department: 2416)

Multiplex communications

Generalized orthogonal or special mathematical techniques

Quadrature carriers

C370S342000, C370S209000, C375S144000, C375S148000

Reexamination Certificate

active

07542408

ABSTRACT:
A receiver of a multicarrier communication system capable of reducing inter-subcarrier interfering signals is to be provided. Receive signals received by a receiving antenna are amplified by a receiving amplifier, subjected to quadrature demodulation by multipliers with respect to the respective subcarriers, and band-limited by lowpass filters. The signals band-limited by the lowpass filters are converted into digital signals by A/D converters at a sampling frequency fs. With respect to the receive signals converted into digital signals, interfering signals leaking between subcarriers are estimated by using A/D converted by the A/D converters and are canceled. The receive signals reduced in interfering signals are multiplexed into a single sequence by a multiplexer, and decoded by a decoder into output signals.

REFERENCES:
patent: 5790549 (1998-08-01), Dent
patent: 2002/0181549 (2002-12-01), Linnartz et al.
patent: 2000-151530 (2000-05-01), None
patent: 2001-308820 (2001-11-01), None
patent: WO 99/05832 (1999-02-01), None
Japanese Office Action dated Sep. 7, 2004, with partial English translation
Yukitoshi Sanada, Masao Nakagawa “A Co-Channel Interference Cancellation Technique Utilizing Convolutional Codes and Orthogonal Multi-Carrier Modulation for Wireless Indoor Communications”, The Institute of Electronics, Information and Communication Engineers, Jul. 25, 1995; vol. 95, No. 184, pp. 31-36, SST95-34-45.

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