Method and apparatus for pulse overlap pre-compensation in digitally modulated signals

A method of pre-compensating for pulse overlap in a digitally modulated signal, the method comprising the steps of:

• receiving a sequence of pulses;
• modulating the pulses to produce a sequence of modulated pulses;
• storing the modulated pulses;
• using non-consecutive pairs of the modulated pulses to produce a sequence of first order error terms;
• storing the sequence of first order error terms;
• and
• subtracting each of the first order error terms from corresponding ones of the modulated pulses to produce a first compensated signal.

An apparatus for pre-compensating for pulse overlap in a digitally modulated signal, the apparatus comprising:

• an input receiving a sequence of signal pulses;
• a first modulator for modulating the signal pulses to produce a first sequence of modulated pulses;
• a first demodulator for demodulating the first sequence of modulated pulses to produce a first sequence of demodulated pulses;
• a first combiner for combining the first sequence of demodulated pulses with the sequence of signal pulses to produce a first sequence of error pulses;
• a second modulator for modulating the first sequence of error pulses to produce a first sequence of modulated error pulses;
• and
• a second combiner for combining the first sequence of modulated error pulses with the first sequence of modulated pulses to produce a first sequence of compensated pulses.

A apparatus for pre-compensating for pulse overlap in a digitally modulated signal, the apparatus comprising:

• an input for receiving a sequence of pulses;
• a first modulator for modulating the pulses to produce a sequence of modulated pulses;
• a first storage element for storing the modulated pulses;
• a first combiner for using non-consecutive pairs of the modulated pulses to produce a sequence of first order error terms;
• a second storage element for storing the sequence of first order error terms;
• and
• a second combiner for subtracting each of the first order error terms from corresponding ones of the modulated pulses to produce a first compensated signal.

An apparatus for pre-compensating for pulse overlap in a digitally modulated signal, the apparatus comprising:

• means for receiving a sequence of signal pulses;
• means for modulating the signal pulses to produce a first sequence of modulated pulses;
• means for demodulating the first sequence of modulated pulses to produce a first sequence of demodulated pulses;
• means for combining the first sequence of demodulated pulses with the sequence of signal pulses to produce a first sequence of error pulses;
• means for modulating the first sequence of error pulses to produce a first sequence of modulated error pulses;
• and
• means for combining the first sequence of modulated error pulses with the first sequence of modulated pulses to produce a first sequence of compensated pulses.

A apparatus for pre-compensating for pulse overlap in a digitally modulated signal, the apparatus comprising:

• means for receiving a sequence of pulses;
• means for modulating the pulses to produce a sequence of modulated pulses;
• means for storing the modulated pulses;
• means for using non-consecutive pairs of the modulated pulses to produce a sequence of first order error terms;
• means for storing the sequence of first order error terms;
• and
• means for subtracting each of the first order error terms from corresponding ones of the modulated pulses to produce a first compensated signal.