Method and apparatus for digitally equalizing a signal in a distributed antenna system

A method for calibrating a signal processing board, the method comprising:

• setting a compensator within a first signal path of a signal processing board to have a flat response across a first pass band of the signal processing board;
• applying a plurality of test signals to an input of the signal processing board, the plurality of test signals spaced in frequency across the first pass band;
• determining a gain value for each of the plurality of test signals based on an output of the signal processing board;
• estimating a system response function y(n) for the signal processing board based on the gain value for each of the plurality of test signals;
• solving for coefficients of a vector h(n) based on a difference between a vector d(n) and a convolution h(n)*y(n), wherein d(n) represents an input to the system response function y(n) subject to a delay;
• and
• setting coefficients of a finite impulse response (FIR) filter within the compensator based on the coefficients of the vector h(n).