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Gain and phase constrained adaptive equalizing filter in a sampled amplitude read channel for magnetic recording
Gain and phase constrained adaptive equalizing filter in a sampled amplitude read channel for magnetic recording
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机译:用于磁记录的采样幅度读取通道中的增益和相位受限的自适应均衡滤波器
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摘要
A sampled amplitude read channel for magnetic disk recording which asynchronously samples the analog read signal, adaptively equalizes the resulting discrete time sample values according to a target partial response, extracts synchronous sample values through interpolated timing recovery, and detects digital data from the synchronous sample values using a Viterbi sequence detector is disclosed. To minimize interference from the timing and gain control loops, the phase and magnitude response of the adaptive equalizer filter are constrained at a predetermined frequency using an optimal orthogonal projection operation as a modification to a least mean square (LMS) adaptation algorithm. Further, with interpolated timing recovery, the equalizer filter and its associated latency are removed from the timing recovery loop, thereby allowing a higher order discrete time filter and a lower order analog filter.
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