Adaptive equalization and regeneration system

An adaptive equalization and regeneration system for reconstructing a signal received in the form of a data pulse train which has been degraded with respect to amplitude and instantaneous frequency, comprising:

• an equalizer for providing a variable gain function for said received signal and outputting an equalized signal, said equalizer gain function being varied in response to a control signal and increasing directly as a function of the frequency of said received signal, said gain function having a slope determined by a change in gain with respect to a change in said frequency;
• digital phase lock logic for receiving said equalized signal and outputting timing information obtained from said equalized signal;
• a regenerator for receiving said equalized signal and said timing information and matching said timing information with said equalized signal to reconstruct the received data essentially in its originally transmitted form;
• control circuitry connected to said equalizer for detecting variances in amplitude and instantaneous frequency in said equalized signal and for outputting said control signal to said equalizer to vary the slope of said equalizer gain function, said control circuitry including control logic for (i) adding said variances in amplitude and instantaneous frequency in said equalized signal to provide a total signal variance, and (ii) determining the slope of said equalizer gain function at which said total signal variance is a minimum;
• an automatic gain control circuit which is connected to said equalizer and which automatically controls an amplifying gain of said received signal to output an amplified signal to said equalizer;
• and
• a peak detecting and averaging circuit comprising (i) a peak detector connected to said equalizer for sensing peak values of individual pulses in the data pulse train and for outputting said peak values, and (ii) a peak averager connected to said peak detector for receiving and averaging said peak values and for outputting an average value of said peak values to said automatic gain control circuit.

An adaptive equalization and regeneration system for reconstructing a signal received in the form of a data pulse train which has been degraded with respect to amplitude and instantaneous frequency, comprising:

• an equalizer for providing a variable gain function for said received signal and outputting an equalized signal, said equalizer gain function being varied in response to a control signal and increasing directly as a function of the frequency of said received signal, said control signal varying the slope of said gain function, said gain function having a slope determined by a change in gain with respect to a change in said frequency;
• digital phase lock logic for receiving said equalized signal and outputting timing information obtained from said equalized signal;
• a regenerator for receiving said equalized signal and said timing information and matching said timing information with said equalized signal to reconstruct the received data essentially in its originally transmitted form;
• control circuitry connected to said equalizer for detecting variances in amplitude and instantaneous frequency in said equalized signal and for outputting said control signal to said equalizer to vary said equalizer gain function in response to said detected variances, said control circuitry including control logic for (i) adding said variances in amplitude and instantaneous frequency in said equalized signal to provide a total signal variance, and (ii) determining the slope of said equalizer gain function at which said total signal variance is a minimum;
• and
• an automatic gain control circuit which is connected to said equalizer and which automatically controls an amplifying gain of said received signal to output an amplified signal to said equalizer.

A method of reconstructing a signal received in the form of a data pulse train which has been degraded with respect to amplitude and instantaneous frequency, comprising the steps of:

• providing a variable equalizing gain for said received signal and outputting an equalized signal, said equalizing gain being varied in response to a control signal and increasing directly as a function of the frequency of said received signal, said equalizing gain defined by a function having a slope determined by a change in gain with respect to a change in said frequency;
• controlling an amplifying gain for said received signal to output an amplified signal, prior to providing a variable equalizing gain for said received signal, by sensing peak values of individual pulses in said equalized signal and averaging said peak values;
• providing said control signal using circuitry for detecting variances in amplitude and instantaneous frequency in said equalized signal, adding said variances in amplitude and instantaneous frequency to provide a total signal variance, determining said slope of said gain function at which said total signal variance is a minimum, and outputting said control signal to alter the slope of said equalizing gain function in response to said variances;
• extracting timing information from said equalized signal and outputting said timing information to a regenerator for receiving said equalized signal and said timing information;
• and
• matching said timing information with said equalized signal to reconstruct the received data essentially in its originally transmitted form.

A method of reconstructing a signal received in the form of a data pulse train which has been degraded with respect to amplitude and instantaneous frequency, comprising the steps of:

• providing a variable equalizing gain for said received signal and outputting an equalized signal, said equalizing gain being varied in response to a control signal and increasing directly as a function of the frequency of said received signal, said equalizing gain defined by a function having a slope determined by a change in gain with respect to a change in said frequency;
• providing said control signal using circuitry for (i) sensing peak amplitudes in the equalized signal, (ii) detecting variances in said peak amplitudes and variances in instantaneous frequency in said equalized signal, and (iii) outputting said control signal to alter said equalizing gain function in response to said detected variances in peak amplitudes and instantaneous frequency;
• extracting timing information from said equalized signal and outputting said timing information to a regenerator for receiving said equalized signal and said timing information;
• and
• matching said timing information with said equalized signal to reconstruct the received data essentially in its originally transmitted form.

An adaptive equalization and regeneration system for reconstructing a signal received in the form of a data pulse train which has been degraded with respect to amplitude and instantaneous frequency, comprising:

• an equalizer for providing a variable gain function for said received signal and outputting an equalized signal, said equalizer gain function being varied in response to a control signal and increasing directly as a function of the frequency of said received signal, said gain function having a slope determined by a change in gain with respect to a change in said frequency;
• digital phase lock logic for receiving said equalized signal and outputting timing information obtained from said equalized signal;
• a regenerator for receiving said equalized signal and said timing information and matching said timing information with said equalized signal to reconstruct the received data essentially in its originally transmitted form;
• and
• control circuitry connected to said equalizer for (i) sensing peak amplitudes in the equalized signal, (ii) detecting variances in said peak amplitudes and variances in instantaneous frequency in said equalized signal, and (iii) outputting said control signal to said equalizer to vary said equalizer gain function in response to said detected variances in peak amplitudes and instantaneous frequency.

A method of reconstructing a signal received in the form of a data pulse train which has been degraded with respect to amplitude and instantaneous frequency, comprising the steps of:

• automatically controlling an amplifying gain for said received signal to output an amplified signal,
• providing a variable equalizing gain for said amplified signal and outputting an equalized signal, said equalizing gain being varied in response to a control signal and increasing directly as a function of the frequency of said amplified signal, said control signal altering the slope of said equalizer gain function, said equalizing gain defined by a function having a slope determined by a change in gain with respect to a change in said frequency;
• providing said control signal using circuitry for (i) detecting variances in amplitude and instantaneous frequency in said equalized signal, (ii) adding said variances in amplitude and instantaneous frequency in said equalized signal to provide a total signal variance, (iii) determining said slope of said gain function at which said total signal variance is a minimum, and (iv) outputting said control signal to alter said equalizing gain function in response to said determined slope;
• extracting timing information from said equalized signal and outputting said timing information to a regenerator for receiving said equalized signal and said timing information;
• and
• matching said timing information with said equalized signal to reconstruct the received data essentially in its originally transmitted form.