| US 7,558,343 B2 | ||
| Tap-selectable viterbi equalizer | ||
| Thomas Klingenbrunn, San Diego, Calif. (US); Lichung Chu, San Diego, Calif. (US); Antoine J. Rouphael, Escondido, Calif. (US); and Benny Vejlgaard, San Diego, Calif. (US) | ||
| Assigned to Siemens Aktiengesellschaft, Munich (Germany) | ||
| Filed on Nov. 21, 2001, as Appl. No. 9/990,844. | ||
| Prior Publication US 2003/0099311 A1, May 29, 2003 | ||
| Int. Cl. H04L 27/06 (2006.01); H03M 13/03 (2006.01) | ||
| U.S. Cl. 375—341 [714/795] | 20 Claims |
| 13. An arrangement for determining a trellis from a sequence of symbols comprising:
a plurality of equalizers receiving said sequence of symbols each generating a trellis,
wherein said equalizers include a tap-selectable Viterbi equalizer;
a select unit for activating one of the equalizers, and
a control unit receiving said sequence of symbols and for determining a power distribution of said sequence of symbols and
controlling said select unit depending on said power distribution,
wherein said tap-selectable equalizer comprises:
means for determining at least one symbol from a previous determination assigned to a current state;
means for determining a destination state of said plurality of states and determining a surviving path metric by comparing
path metrics originating from the determined symbol;
means for determining the value of a previous symbol with respect to the symbol of the surviving state; and
calculating means for generating a reduced trellis by calculating only path metrics for states in which the previous symbol
has the determined value.
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