Pulse or digital communications – Receivers – Interference or noise reduction
Patent
1996-02-02
1997-10-07
Chin, Stephen
Pulse or digital communications
Receivers
Interference or noise reduction
375220, 375285, H03D 104, H03D 106
Patent
active
056756135
ABSTRACT:
In order to carry out high-precision control of distortion compensation, a received signal is split into two signals. One of the resulting signals ("the first signal") is provided to a distortion generator with similar characteristics to the distortion produced at the signal transmitting side, and the phase and amplitude of the other of the resulting signals ("the second signal") are controlled. By adding these two signals, the desired signal is suppressed and only the distortion component is extracted. This process is controlled by correlation detection of the desired signal. Next, the distortion component contained in the second signal is removed by controlling the phase and amplitude of this extracted distortion component and adding the result to the second signal. This process is controlled by detecting the correlation between the extracted distortion component and the error component contained in the signal after the addition. This enables compensation for distortion produced at the transmitting side to be performed at the receiving side, so that the size of transmitting equipment can be reduced.
REFERENCES:
patent: 4475215 (1984-10-01), Gutleber
patent: 5260972 (1993-11-01), Wang
patent: 5537443 (1996-07-01), Yoshino et al.
Uwano Shuta
Watanabe Kazuji
Chin Stephen
Ghayour Mohammad
Nippon Telegraph & Telephone Corporation
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