Frequency shifting a communications signal(s) in a multi-frequency distributed antenna system (DAS) to avoid or reduce frequency interference
First Claim
1. A frequency interference prediction system, comprising:
- a communications signal interface configured to provide communications to a plurality of antennas in a wireless communication system, comprising;
a first communications signal interface configured to receive at least one first communications signal in at least one first frequency range; and
a second communications signal interface configured to receive at least one second communications signal in at least one second frequency range different from the at least one first frequency range;
a first communications signal path communicatively coupled to the first communications signal interface, the first communications signal path comprising;
a first frequency shifting circuit configured to frequency shift the at least one first communications signal from a first frequency in the at least one first frequency range to a shifted first communications signal at a shifted first frequency based on a first frequency control signal;
a second communications signal path communicatively coupled to the second communications signal interface and configured to provide the at least one second communications signal as an output second communications signal to a second communications signal path output;
a combiner communicatively coupled to a first communications signal path output and the second communications signal path output, the combiner configured to combine an output first communications signal and the output second communications signal into a combined multi-frequency communications signal;
an electrical-to-optical converter configured to convert the combined multi-frequency communications signal into an optical combined multi-frequency communications signal; and
a controller configured to;
predict frequency interference in the combined multi-frequency communications signal; and
if frequency interference is predicted in the combined multi-frequency communications signal;
determine the shifted first frequency to shift the at least one first communications signal in the combined multi-frequency communications signal; and
set the first frequency control signal to cause the first frequency shifting circuit to frequency shift the at least one first communications signal to the shifted first communications signal at the shifted first frequency.
2 Assignments
0 Petitions
Accused Products
Abstract
Frequency shifting a communications signal(s) in a multiple frequency (multi-frequency) distributed antenna system (DAS) to avoid or reduce frequency interference is disclosed. Related devices, methods, and DASs are disclosed. Non-limiting examples of frequency interference include frequency band interference and frequency channel interference. As a non-limiting example, frequency interference in a multi-frequency DAS may result from non-linearity of a signal processing component generating an out-of-band harmonic of a first, in-use communications signal in a first frequency band, within different frequency band(s) of other in-use communications signal(s). To avoid or reduce such interference, embodiments disclosed herein involve predicting frequency interference that may result from processing received, in-use communications signals in multiple frequency bands to be distributed in a multi-frequency DAS. Frequency shifting is performed to avoid or reduce any interfering signal products produced from the signal processing of any in-use communications signals, from interfering in the frequencies of other in-use communications signals.
1073 Citations
16 Claims
-
1. A frequency interference prediction system, comprising:
-
a communications signal interface configured to provide communications to a plurality of antennas in a wireless communication system, comprising; a first communications signal interface configured to receive at least one first communications signal in at least one first frequency range; and a second communications signal interface configured to receive at least one second communications signal in at least one second frequency range different from the at least one first frequency range; a first communications signal path communicatively coupled to the first communications signal interface, the first communications signal path comprising; a first frequency shifting circuit configured to frequency shift the at least one first communications signal from a first frequency in the at least one first frequency range to a shifted first communications signal at a shifted first frequency based on a first frequency control signal; a second communications signal path communicatively coupled to the second communications signal interface and configured to provide the at least one second communications signal as an output second communications signal to a second communications signal path output; a combiner communicatively coupled to a first communications signal path output and the second communications signal path output, the combiner configured to combine an output first communications signal and the output second communications signal into a combined multi-frequency communications signal; an electrical-to-optical converter configured to convert the combined multi-frequency communications signal into an optical combined multi-frequency communications signal; and a controller configured to; predict frequency interference in the combined multi-frequency communications signal; and if frequency interference is predicted in the combined multi-frequency communications signal; determine the shifted first frequency to shift the at least one first communications signal in the combined multi-frequency communications signal; and set the first frequency control signal to cause the first frequency shifting circuit to frequency shift the at least one first communications signal to the shifted first communications signal at the shifted first frequency. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
-
10. A method of avoiding or reducing frequency interference, comprising:
-
receiving at least one first communications signal in at least one first frequency range comprising a first communications signal path output; receiving at least one second communications signal in at least one second frequency range different from the at least one first frequency range comprising a second communications signal path output; predicting frequency interference in a combined multi-frequency communications signal comprising the at least one first communications signal combined with the at least one second communications signal, as a result of an interfering signal product produced as a result of signal processing at least one of the at least one first communications signal and the at least one second communications signal; if frequency interference is predicted in the combined multi-frequency communications signal; determining a shifted first frequency to shift the at least one first communications signal in the combined multi-frequency communications signal; frequency shifting the at least one first communications signal to a shifted first communications signal at the shifted first frequency; and providing the shifted first communications signal as an output first communications signal to the first communications signal path output; and combining the first communications signal path output and the second communications signal path output to provide the combined multi-frequency communications signal. - View Dependent Claims (11, 12)
-
-
13. A multiple frequency communication system, comprising:
-
a central unit configured to; receive a combined uplink multi-frequency communications signal from a plurality of remote units; receive a first downlink communications signal in at least one first frequency range and a second downlink communications signal in at least one second frequency range different from the at least one first frequency range; and distribute the first downlink communications signal as an output first downlink communications signal to a first downlink communications signal path output and the second downlink communications signal as an output second downlink communications signal to a second downlink communications signal path output; the central unit comprising; a combiner communicatively coupled to the first downlink communications signal path output and the second downlink communications signal path output, the combiner configured to combine the output first downlink communications signal and the output second downlink communications signal into a combined downlink multi-frequency communications signal; and an electrical-to-optical converter configured to convert the combined multi-frequency communications signal into an optical signal; the plurality of remote units each configured to; receive the combined downlink multi-frequency communications signal from the central unit and distribute the combined downlink multi-frequency communications signal from the central unit to at least one client device; receive a first uplink communications signal in at least one first frequency range and a second uplink communications signal in at least one second frequency range different from the at least one first frequency range; and distribute the first uplink communications signal as an output first uplink communications signal to a first uplink communications signal path output and the second uplink communications signal as an output second uplink communications signal to a second uplink communications signal path output; at least one of the remote units comprising; a combiner communicatively coupled to the first uplink communications signal path output and the second uplink communications signal path output, the combiner configured to combine the output first uplink communications signal and the output second uplink communications signal into a combined uplink multi-frequency communications signal; a frequency interference prediction system, comprising; a first communications signal path, comprising; a first frequency shifting circuit configured to frequency shift at least one first communications signal among the first downlink communications signal and the first uplink communications signal from a first frequency to a shifted first communications signal at a shifted first frequency based on a first frequency control signal; a second communications signal path configured to provide at least one second communications signal among the second downlink communications signal and the second uplink communications signal as an output second communications signal to a second communications signal path output among the second downlink communications signal path output and the second uplink communications signal path output; and a controller configured to; predict frequency interference in a combined multi-frequency communications signal among the combined downlink multi-frequency communications signal and the combined uplink multi-frequency communications signal; if frequency interference is predicted in the combined multi-frequency communications signal; determine the shifted first frequency to shift the at least one first communications signal in the combined multi-frequency communications signal; and set the first frequency control signal to cause the first frequency shifting circuit to frequency shift the at least one first communications signal to the shifted first communications signal at the shifted first frequency. - View Dependent Claims (14, 15, 16)
-
Specification