Jitter sensitive maximum-a-posteriori sequence detection

A method for detecting a signal from a channel with jitter noise comprising:

• inserting anchor points into a bit detection interval using an anchor points inserter;
• calculating discrete-time transition responses from the channel corresponding to the inserted anchor points using a transition response calculator;
• generating possible bit sequences having a length up to a number of data bits to be detected from the channel using a bit sequence generator;
• calculating nominal signals with a desired signal calculator, the nominal signals corresponding to transition location information from the anchor points inserter, calculated transition responses from the transition calculator, and the possible bit sequences from the bit sequence generator;
• detecting an output bit sequence based on a nominal signal that has a minimum distance from a signal received from the channel using a data detector;
• and
• generating a reliability information output based on the distance information provided by the distance calculator.

A channel detector comprising:

• an anchor points inserter adapted to insert anchor points into a bit detection interval, the anchor points corresponding to values of expected transition locations for transition shifts within received signals;
• a bit generator adapted to generate possible bit sequences having a length corresponding to a number of bits to be detected;
• a signal calculator coupled to the anchor points inserter and to the bit sequence generator, the signal calculator adapted to calculate nominal signals based on the possible bit sequences and on information from the anchor points inserter;
• and
• a data detector coupled to a channel and adapted to receive a signal, the data detector adapted to identify a bit sequence corresponding to a nominal signal having a minimum distance from the received signal, the data detector adapted to generate a soft reliability information output based on the received signal using a maximum-likelihood or a maximum a-posteriori probability algorithm.