A system, comprising: a power supply comprising an output configured to be coupled by a power cable to a radio; and a processing system (114, 214) coupled to the power supply; wherein the power supply is configured to operate at at least two different sets of operating voltages and currents which are used to determine a resistance of the power cable; wherein while the radio is configured to operate with constant power consumption, the processing system is configured to: set a first voltage level provided to the power cable; measure a first current level provided to the power cable; set a second voltage level provided to the power cable; measure a second current level provided to the power cable; determine a first resistance of the power cable using the first voltage level, the second voltage level, the first current level, the first current level, and the second current level; set at least one additional voltage level provided to the power cable; measure a corresponding current level for each of the at least one additional voltage level; and determine a second resistance of the power cable using the first voltage level, the second voltage level, the first current level, and the second current level, and the at least one additional voltage level and a corresponding at least one current level; characterized in that determining the second resistance of the power cable comprises: determine a least mean squares estimate of V 2 I 2 − V 1 I 1 I 2 2 − I 1 2 using the first voltage level, the second voltage level, the first current level, and the second current level, and the at least one additional voltage level and the corresponding at least one current level. a power supply comprising an output configured to be coupled by a power cable to a radio; and a processing system (114, 214) coupled to the power supply; wherein the power supply is configured to operate at at least two different sets of operating voltages and currents which are used to determine a resistance of the power cable; wherein while the radio is configured to operate with constant power consumption, the processing system is configured to: set a first voltage level provided to the power cable; measure a first current level provided to the power cable; set a second voltage level provided to the power cable; measure a second current level provided to the power cable; determine a first resistance of the power cable using the first voltage level, the second voltage level, the first current level, the first current level, and the second current level; set at least one additional voltage level provided to the power cable; measure a corresponding current level for each of the at least one additional voltage level; and determine a second resistance of the power cable using the first voltage level, the second voltage level, the first current level, and the second current level, and the at least one additional voltage level and a corresponding at least one current level; characterized in that set a first voltage level provided to the power cable; measure a first current level provided to the power cable; set a second voltage level provided to the power cable; measure a second current level provided to the power cable; determine a first resistance of the power cable using the first voltage level, the second voltage level, the first current level, the first current level, and the second current level; set at least one additional voltage level provided to the power cable; measure a corresponding current level for each of the at least one additional voltage level; and determine a second resistance of the power cable using the first voltage level, the second voltage level, the first current level, and the second current level, and the at least one additional voltage level and a corresponding at least one current level; characterized in that determining the second resistance of the power cable comprises: determine a least mean squares estimate of V 2 I 2 − V 1 I 1 I 2 2 − I 1 2 using the first voltage level, the second voltage level, the first current level, and the second current level, and the at least one additional voltage level and the corresponding at least one current level.