Method for transporting a signal in a radio network
View Patent ↗For ensuring a low cost transport of signals in a radio network, in particular with a high density of radio access points, a method is proposed, where the signals are transported over wires between a base station and radio access points, comprising the steps of: determining the useful band of each wire ( 20 ); associating at least two wires ( 21 ); filtering the signal into sub-bands ( 22 ); transporting each sub-band over one or more wires of the associated wires ( 25 ); at the receiving end rebuilding the signal from the sub-bands ( 27 ). Further proposed are a radio head and a radio controller both adapted to the present method.
1. A method for transporting an Orthogonal Frequency Division Multiplexing signal in a radio network, wherein the signal is transported over wires between a radio head and a radio controller, said method comprising the steps of:
determining a useful band of each wire;
associating at least two wires in a group based at least in part on the Orthogonal Frequency Division Multiplexing signal to be transported, known transport conditions, and the useful bands resulting from the determining;
filtering the Orthogonal Frequency Division Multiplexing signal into sub-bands;
creating a direct spectrum and an associated inverse spectrum of each sub-band;
transporting the direct spectrum and corresponding inverse spectrum for each sub-band from a sending network device to a receiving network device over the group of associated wires, wherein the direct spectra are transported over a first portion of the group of associated wires and the inverse spectra are transported over a second portion of the group of associated wires;
at the receiving network device, recombining each direct spectrum and the associated inverse spectrum for each sub-band; and
rebuilding the Orthogonal Frequency Division Multiplexing signal from the sub-bands resulting from the recombining.
2. The method according to claim 1 , comprising the further step of equalizing each sub-band resulting from the recombining.
3. The method according to claim 1 , comprising the further step of demultiplexing the Orthogonal Frequency Division Multiplexing signal before the filtering into sub-bands.
4. The method according to claim 1 , wherein the spectra are transported over copper wires.
5. A radio controller for transporting a signal in a radio network over wires to and from a radio head, the radio controller comprising:
means for determining a useful band of each wire;
means for associating at least two wires in a group based at least in part on the signal to be transported, known transport conditions, and the useful bands resulting from the determining;
means for filtering signals into sub-bands for transport to the radio head;
signal shaping means for duplication, inversion and Fourier-type transformation of filtered sub-bands to be transported to the radio head; and
means for rebuilding signals from filtered sub-bands received from the radio head.
6. The radio controller according to claim 5 , wherein the signal to be transported is multiplexed, the radio controller further comprising demultiplexing means for demultiplexing the signal prior to the filtering into sub-bands.
7. A radio head for transporting a signal in a radio network over wires to and from a radio controller, the radio head comprising:
means for determining a useful band of each wire;
means for filtering signals into sub-bands for transport to the radio controller;
signal shaping means for duplication, inversion and Fourier-type transformation of filtered sub-bands to be transported to the radio controller;
means for rebuilding signals from filtered sub-bands received from the radio controller; and
means for associating at least two wires in a group based at least in part on the signal to be transported, known transport conditions, and the useful bands resulting from the determining.
8. The radio head according to claim 7 , wherein the signal to be transported is multiplexed, the radio head further comprising demultiplexing means for demultiplexing the signal prior to the filtering into sub-bands.
9. The method according to claim 1 wherein the sending network device is the radio controller and the receiving network device is the radio head.
10. The method according to claim 1 , comprising the further step of fine equalizing the Orthogonal Frequency Division Multiplexing signal resulting from the rebuilding.
11. The method according to claim 1 , comprising the further step of fine calibrating the Orthogonal Frequency Division Multiplexing signal resulting from the rebuilding.
12. The radio controller according to claim 5 , further comprising multiplexing means.
13. The radio controller according to claim 5 , further comprising analog-digital conversion means.
14. The radio controller according to claim 5 , further comprising digital-analog conversion means.
15. The radio controller according to claim 5 wherein the signal shaping means is also for amplification, equalization, and calibration of signals resulting from the rebuilding of filtered sub-bands received from the radio head.
16. The radio head according to claim 7 , further comprising multiplexing means.
17. The radio head according to claim 7 , further comprising analog-digital conversion means.
18. The radio head according to claim 7 , further comprising digital-analog conversion means.
19. The radio head according to claim 7 wherein the signal shaping means is also for amplification, equalization, and calibration of signals resulting from the rebuilding of filtered sub-bands received from the radio controller.