发明名称 |
PRML system with reduced complexity maximum likelihood detector |
摘要 |
A less complex maximum likelihood detector can be implemented in a partial response maximum likelihood (PRML) system without degrading system performance by saturating y values from a gain control loop to a smaller range before the y values are supplied to the maximum likelihood detector. A quantity "D" of a maximum likelihood detector operating in accordance with a partial response scheme has a particular relationship with respect to the maximum (ymax) of the y input values processed by the maximum likelihood detector. In some embodiments, y values from a gain control loop are saturated from a first larger range (defined by ymaxreal) to a second smaller range (defined by a value SAT) which is at least as great as the ymax of the ideal input signal (ymaxideal) for the partial response scheme. The saturated y values are provided to the maximum likelihood detector. The D of the maximum likelihood detector (given the partial response scheme and the smaller range of y values) is in a different "two to the power of an integer range" than the D would have been given the same partial response scheme but the larger range of y values.
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申请公布号 |
US5914989(A) |
申请公布日期 |
1999.06.22 |
申请号 |
US19970800989 |
申请日期 |
1997.02.19 |
申请人 |
NEC ELECTRONICS, INC. |
发明人 |
THAPAR, HEMANT K.;SHIH, SHIH-MING;YEUNG, KWOK W. |
分类号 |
G11B20/14;G11B20/10;G11B20/18;H03G3/20;H03M13/23;H03M13/39;H04L1/00;(IPC1-7):H03M13/12 |
主分类号 |
G11B20/14 |
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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