Pulse or digital communications – Transceivers – Modems
Reexamination Certificate
2005-10-04
2005-10-04
Fan, Chieh M. (Department: 2634)
Pulse or digital communications
Transceivers
Modems
C375S353000
Reexamination Certificate
active
06952441
ABSTRACT:
To determine the channel characteristic of a channel (CHANNEL) between a transmitter (TX) and a receiver (RX), a predetermined periodic signal of pulse amplitude modulated symbols is modulated on waveforms by a cosine modulated filter bank (DWMT MOD) in the transmitter (TX), and the waveforms are transmitted over the channel (CHANNEL). In the receiver (RX), the received pulse amplitude modulated symbols are demodulated from the waveforms by a cosine modulated filter bank (DWMT DEMOD), pairs of the received pulse amplitude modulated symbols are combined to form received quadrature amplitude modulated symbols, and the received quadrature amplitude modulated symbols are divided by the transmitted predetermined pulse amplitude modulated symbols considered pairwise as transmit quadrature amplitude modulated symbols. So, samples of the channel characteristic are generated.
REFERENCES:
patent: 5005189 (1991-04-01), Hackett, Jr.
patent: 5436940 (1995-07-01), Nguyen
patent: 5715280 (1998-02-01), Sandberg et al.
patent: 6101223 (2000-08-01), Betts
patent: 6445731 (2002-09-01), Yamano et al.
patent: 6590893 (2003-07-01), Hwang et al.
O. van de Wiel et al.: “Discrete Wavelet Multitone for Copper Line Transmission”, Proceedings of the ‘Wavelet Analysis: A New Toll in Signal and Image Processing’, Symposium, IEEE Benelux Signal Processing Chapter, Antwerp Dec. 11, 1996.
Andrew Bruce et al.: “Wavelet Analysis”, IEEE Spectrum, Oct. 1996, pp. 26-35.
Gross, R. et al.: “Discrete Wavelet Multitone (DWMT) System for Digital Transmission Over HFC Links” Proceedings of the SPIE, Oct. 23, 1995, XP000576748.
Sandberg, S. D. et al.: “Overlapped Discrete Multitone Modulation for high Speed Copper Wire Communications” IEEE Journal on Selected Areas in Communications, vol. 13, No. 9, Dec. 1, 1995, pp. 1571-1585, XP000543156, US,New York, NY, ISSN: 0733-8716.
Govardhanagiri, S. et al.: “Performance analysis of multicarrier modulation systems using cosine modulated filter banks” 1999 IEEE International Conference on Acoustics, Speech, and Signal Processing, vol. 3, Mar. 15-19, 1999, pp. 1405-1408, XP002139688, Piscataway, NJ, USA, IEEE, USA ISBN: 0-7803-5041-3.
Alcatel
Fan Chieh M.
Perilla Jason M.
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