Patent ID: 8908753

Claim:
A calibration sub-system for calibrating a unit of a distributed antenna system comprising: a signal generator configured to provide a plurality of test signals to a communication path of the unit, wherein each of the plurality of test signals is generated based on a respective one of a plurality of modification schemes for at least one of an in-phase signal component and a quadrature signal component; a receiver disposed in the communication path of the unit, the receiver configured to receive a plurality of output signals generated using the plurality of test signals; and a processor communicatively coupled to the signal generator and the receiver, wherein the processor is configured to: for each modification scheme of the plurality of modification schemes, determine a respective output power value for at least one undesirable signal component of a respective output signal received by the receiver, wherein the respective output power value is a function of the modification scheme for the in-phase signal component or the quadrature signal component of a respective test signal, the function being at least one of a Taylor series function or a polynomial function, and determine an optimal modification scheme for at least one of the in-phase signal component and the quadrature signal component such that an output power of the at least one undesirable signal component is minimized, wherein applying the function having the optimal modification scheme as an input minimizes an output value of the function.