Pulse or digital communications – Equalizers – Automatic
Patent
1997-09-03
2000-05-23
Chin, Stephen
Pulse or digital communications
Equalizers
Automatic
370350, 375348, 375233, H03H 730, H03H 740
Patent
active
060673192
ABSTRACT:
A method and apparatus for equalizing a received quadrature amplitude modulated signal is disclosed. To equalize the signal, a band edge equalizer (BEE) is used in combination with a symbol spaced equalizer (SSE) and possibly a decision feedback equalizer (DFE). The equalizer's are used along a series path to equalize the QAM signal in a series of equalization operations. By separating the equalization of the signal to separate equalizers, the cost of the equalization can be reduced without substantially affecting performance. In particular, band edge equalizing the QAM signal and symbol space equalizing the symbol can reduce the number of multiplies per second required by any particular equalizer. Accordingly, the equalizers used can be less expensive. Also, using a decimating circuit between the BEE and the SSE that decimates the sample rate of the signal being provided to the SSE can further reduce the number of multiplies per second that must be performed by the SSE. Clock recovery and synchronization circuits have also been disclosed.
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Chin Stephen
Integrated Device Technology Inc.
McKiernan Thomas E.
LandOfFree
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