Adaptive transverse equalizer

An adaptive transverse equalizer, comprising:

• a plurality of iteratively connected delay element means each having a delay time T in accordance with a spacing between two successively sent characters;
• a plurality of control element means each connected to respective inputs of a summer and having manipulated variables representing coefficients derived from output signals of a decision stage means;
• said decision stage means providing (n-1) positive and m negative coefficients set in accordance with a zero-forcing algorithm;
• linear transverse filter means forming a decision controlled recursion path for providing at least one additional, positive, decision-fedback coefficient as a correction pulse following upon an access region of said linear transverse filter means and whose loop transit time corresponds to n times or n+i times a symbol period, wherein m is a whole number.gtoreq.0, i is a whole number.gtoreq.1, and n is a whole number.gtoreq.2;
• and
• wherein said transverse filter means comprises an analog-to-digital converter connecting to a low pass filter which in turn connects to a delay element.

An adaptive transverse equalizer, comprising:

• a plurality of iteratively connected delay element means each having a delay time T in accordance with a spacing between two successively sent characters;
• a plurality of control element means each connected to respective inputs of a summer and having manipulated variables representing coefficients derived from output signals of a decision stage means;
• said decision stage means providing (n-1) positive and m negative coefficients set in accordance with a zero-forcing algorithm;
• linear transverse filter means forming a decision controlled recursion path for providing at least one additional, positive, decision-fedback coefficient as a correction pulse following upon an access region of said linear transverse filter means and whose loop transit time corresponds to n times or n+i times a symbol period, wherein m is a whole number.gtoreq.0, i is a whole number.gtoreq.1, and n is a whole number.gtoreq.2;
• said decision stage means comprising a decision stage formed of an analog-to-digital converter having first, second, and third outputs;
• the decision stage first output connecting to a plurality of series connected delay elements having a delay T, said delay elements connecting to first inputs of a plurality of logic gates, second inputs of the plurality of logic gates connecting to the decision stage third output via a delay means having a delay time greater than T;
• outputs of the logic elements connecting to respective integrators for each of the coefficients, said integrators outputting to said respective control elements;
• and
• said transverse filter means comprising an analog-to-digital converter having first and second inputs respectively connecting to the first and second inputs of the decision stage, and an output of the analog-to-digital converter connecting through a low-pass filter to a delay element having a delay greater than T, the delay element outputting to an additional control element means at which the at least one additional positive decision fedback coefficient is provided.

An adaptive equalizer, comprising:

• an input signal applied in parallel to a plurality of control element means, output signals at outputs of the respective control element means being connected into a transit time chain having a plurality of elements each having a time T associated therewith, the respective control element means connecting to the respective elements of the transit time chain;
• the control element means each having manipulated variables respectively associated therewith representing coefficients which are derived from output signals of a decision stage means connected to the respective control element means;
• said decision stage means providing (n-1) positive and m negative coefficients set in accordance with a zero-forcing algorithm;
• and
• means forming a decision controlled recursion path for providing at least one additional positive, decision-fedback coefficient as a correction pulse following upon an access region of said linear transverse filter means and whose loop transit time corresponds to n times or (n+1) times a symbol period, wherein m is a whole number.gtoreq.0, i is a whole number.gtoreq.1, and n is a whole number.gtoreq.2.