Multiplex communications – Duplex – Transmit/receive interaction control
Patent
1995-09-29
1998-09-22
Chin, Wellington
Multiplex communications
Duplex
Transmit/receive interaction control
370289, 370292, 379406, 379410, H04B 320
Patent
active
058125370
ABSTRACT:
A processor of a cellular modem monitors for the presence of a residual echo signal during a full-duplex portion of a training sequence. In particular, the processor monitors an equalizer error signal during a full-duplex training phase that follows the half-duplex training phase for the echo canceler. If the processor detects a level of the error signal greater than a predefined threshold, the processor presumes the increase in the error signal is due to the presence of a residual echo signal and performs a predefined adjustment of the taps of the corresponding echo canceler of the cellular modem.
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IEEE Transactions On Communications, vol. COM-26, No. 5, May 1978, pp. 647-653, authored by Donald L. Duttweiler, entitled "A Twelve-Channel Digital Echo Canceler".
IEEE Journal On Selected Areas In Communications, vol. SAC-2, No. 2, Mar. 1984, pp. 297-303, authored by Donald L. Duttweiler, C. W. K. Gritton, Kevin D. Kolwicz and Ying G. Tao, entitled "A cascadable VLSI Echo Canceller".
ICASSP-93, 1993 IEEE International Conference on Acoustics, Speech and Signal Processing, Plenary, Special, Audio, Underwater Acoustics, VLSI, Neural Networks, vol. I of V, Apr. 27-30, 1993, Minneapolis Convention Center, Minneapolis, Minnesota, U.S.A. 93-CH3252-4.
Betts William Lewis
Hazen Ramon B.
Scott Robert Earl
Carman Melissa Kay
Chin Wellington
Horstemeyer Scott A.
Paradyne Corporation
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