Capacitive-loaded jumper cables, shunt capacitance units and related methods for enhanced power delivery to remote radio heads
Tower systems suitable for use at cellular base stations include a tower, an antenna mounted on the tower, a remote radio head mounted on the tower and a power supply. A power cable having a power supply conductor and a return conductor is connected between the power supply and the remote radio head. A shunt capacitance unit that is separate from the remote radio head that is electrically coupled between the power supply conductor and the return conductor of the power cable.
1. A method of operating a cellular base station, the method comprising:
supplying a direct current (“DC”) power signal from a power supply to a remote radio head that is mounted remotely from the power supply over a power cabling connection that includes a power supply conductor and a return conductor, the power cabling connection including a shunt capacitance unit coupled between power supply conductor and the return conductor;
transmitting an alternating current (“AC”) control signal onto the power cabling connection;
receiving the AC control signal after it passes through the shunt capacitance unit; and
determining a resistance or an impedance of the power cabling connection based on the received AC control signal.
2. The method of claim 1 , wherein a frequency of the AC control signal is at least 100 Hertz.
3. The method of claim 1 , wherein a frequency of the AC control signal is at least 100 kilohertz.
4. The method of claim 1 , wherein the shunt capacitance unit is adjacent the remote radio head.
5. The method of claim 1 , wherein determining the resistance or the impedance of the power cabling connection based on the received AC control signal comprises measuring at least one of a voltage level and a current level of the received AC control signal and calculating the resistance or impedance of the power cabling connection based on the at least one measured voltage level and/or current level.
6. The method of claim 1 , wherein the AC control signal is generated by a pulse generator of the power supply.
7. The method of claim 1 , wherein the power cabling connection comprises a trunk cable and a jumper cable that are connected in series.
8. The method of claim 7 , wherein the shunt capacitance unit is part of the jumper cable.
9. The method of claim 1 , wherein a frequency of the AC control signal is selected to be high enough so that the AC control signal will pass through the shunt capacitance unit.
10. The method of claim 9 , wherein the frequency of the AC control signal is lower than a transmission frequency of the remote radio head.
11. The method of claim 1 , wherein determining the resistance or an impedance of the power cabling connection based on the received AC control signal comprises using Ohm's law to calculate the resistance or impedance of the power cabling connection based on a measured voltage level and/or current level.
12. The method of claim 1 , wherein a frequency of the AC control signal is between 100 Hertz and 100 kilohertz.