SIGNAL LEVEL RECOVERY FOR PARTIAL RESPONSE CHANNELS

摘要

The invention proposes a PR level detection method and apparatus which jointly estimate multiple PR levels (227) based on multiple channel signal samples (201, 205). Overlapping vectors of e.g. m=2 consecutive PR levels are jointly estimated based on corresponding vectors of samples. The sample vector and the associated PR level vector can directly be input to the prior art formula for estimating timing error. Alternatively, from the multiple PR values available per each time index n, a single PR level may be derived e.g. by majority vote with or without weighting. The invention also describes a compact apparatus structure for realizing the method. It employs the fact that the set of possible PR-levels is fixed, and employs a scaling factor (2) and a common term for subtraction (c1, c2).