发明名称 |
ADAPTIVE EQUALIZATION FOR PRIV TRANSMISSION SYSTEMS |
摘要 |
In a receiver for signals in a multilevel partial response class-IV communication system, the coefficients of a digital adaptive equalizer need to be updated to minimize the error due to noise and signal distortion. After initial convergence of the equalizer coefficients to near-optimum settings, an estimate of the mean-square error gradient for coefficient updating can be obtained in decision-directed mode from an estimate of the error signal. In the absence of a reference signal, initial convergence must be achieved in self-training mode. The decision-directed error signal is then replaced by a pseudo-error signal for the computation of an approximation of the mean-square error gradient. The invention provides a particular self-training procedure which outperforms known methods in terms of speed of convergence and achieved mean-square error values, and does not require timing recovery prior to equalizer convergence.
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申请公布号 |
WO9620551(A1) |
申请公布日期 |
1996.07.04 |
申请号 |
WO1994EP04332 |
申请日期 |
1994.12.28 |
申请人 |
INTERNATIONAL BUSINESS MACHINES CORPORATION;CHERUBINI, GIOVANNI;OELCER, SEDAT;UNGERBOECK, GOTTFRIED |
发明人 |
CHERUBINI, GIOVANNI;OELCER, SEDAT;UNGERBOECK, GOTTFRIED |
分类号 |
H03H21/00;H04B3/06;H04L25/03;H04L25/497;(IPC1-7):H04L25/03 |
主分类号 |
H03H21/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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