Controlling power output of a modem for power line communications
There is provided an arrangement of components for use in a power line communication system. The arrangement includes a modem for providing an output to a power line, a sensor for sensing a parameter of the output; and a controller for adjusting a power of the output based on a value of the parameter.
1. A system comprising:
a modem for providing an output to a power line in a power line communication system;
a sensor for sensing a parameter of said output; and
a controller for adjusting a power of said output based on a value of said parameter,
wherein said output includes a first frequency sub-band and a second frequency sub-band, and
wherein said controller adjusts said power to a first power for said first frequency sub-band and a second power for said second frequency sub-band.
2. The system of claim 1 , wherein said controller maximizes said power while limiting said power to a predetermined level of electromagnetic radiation.
3. The system of claim 1 , wherein said parameter comprises an electromagnetic radiation.
4. The system of claim 1 , wherein said parameter comprises a signal current in said power line.
5. The system of claim 1 , wherein said parameter comprises a signal voltage on said power line.
6. The system of claim 1 , wherein said parameter comprises a real component of said power.
7. The system of claim 6 , wherein said sensor comprises a phase detector that receives an input indicative of said real component.
8. The system of claim 1 ,
wherein said output produces an electromagnetic radiation intensity from said power line,
wherein said parameter and said electromagnetic radiation form a ratio, and
wherein said controller adjusts said power to compensate for variations in said ratio over a transmitter frequency band of said modem.
9. A system comprising:
a modem for providing an output to a power line in a power line communication system;
a sensor for sensing a parameter of said output; and
a controller for adjusting a power of said output based on a value of said parameter,
wherein said modem provides said output by sequentially transmitting over a first frequency sub-band and a second frequency sub-band, and
wherein said controller adjusts said power to a first power for said first frequency sub-band and a second power for said second frequency sub-band.
10. A method comprising:
providing an output from a modem to a power line in a power line communication system;
sensing a parameter of said output; and
adjusting a power of said output based on a value of said parameter,
wherein said output includes a first frequency sub-band and a second frequency sub-band, and
wherein said adjusting comprises adjusting said power to a first power for said first frequency sub-band and a second power for said second frequency sub-band.
11. The method of claim 10 , wherein said adjusting comprises maximizing said power while limiting said power to a predetermined level of electromagnetic radiation.
12. The method of claim 10 , wherein said parameter comprises an electromagnetic radiation.
13. The method of claim 10 , wherein said parameter comprises a signal current in said power line.
14. The method of claim 10 , wherein said parameter comprises a signal voltage on said power line.
15. The method of claim 10 , wherein said parameter comprises a real component of said power.
16. The method of claim 15 , wherein said sensing is performed by a phase detector that receives an input indicative of said real component.
17. The method of claim 10 ,
wherein said output produces an electromagnetic radiation intensity from said power line,
wherein said parameter and said electromagnetic radiation form a ratio, and
wherein said adjusting comprises adjusting said power to compensate for variations in said ratio over a transmitter frequency band of said modem.
18. A method comprising:
providing an output from a modem to a power line in a power line communication system;
sensing a parameter of said output; and
adjusting a power of said output based on a value of said parameter,
wherein said modem provides said output by sequentially transmitting over a first frequency sub-band and a second frequency sub-band, and
wherein said adjusting comprises adjusting said power to a first power for said first frequency sub-band and a second power for said second frequency sub-band.