Extracting sub-bands from signals in a frequency domain
First Claim
Patent Images
1. A method comprising:
- sub-dividing a downlink signal into a sub-divided downlink signal having a plurality of downlink signal components in a time domain, wherein each of the plurality of downlink signal components corresponds to a respective sub-band;
determining that at least one component of the plurality of downlink signal components corresponds to at least one sub-band having data to be transmitted via a distributed antenna system;
generating, subsequent to determining that the at least one component from the sub-divided downlink signal corresponds to the at least one sub-band, a transformed downlink signal by performing a frequency transform on the downlink signal, wherein the transformed downlink signal represents the downlink signal in a frequency domain;
determining that the at least one sub-band of the transformed downlink signal includes the data to be transmitted; and
extracting the at least one sub-band from the transformed downlink signal for transmission via the distributed antenna system;
wherein extracting the at least one sub-band from the transformed downlink signal comprises;
identifying, by a unit in the distributed antenna system, at least one bin of the transformed downlink signal in the frequency domain that corresponds to the at least one sub-band,providing, by the unit, data for the at least one bin to at least one remote antenna unit of the distributed antenna system,identifying, by the unit, at least one additional bin of the transformed downlink signal in the frequency domain that corresponds to at least one additional sub-band that lacks data to be transmitted, anddiscarding additional data for the at least one additional bin.
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Abstract
Embodiments are disclosed for extracting sub-bands of interest from signals in a frequency domain for transmission via a distributed antenna system. In one aspect, a transformed downlink signal is generated by performing a frequency transform on a downlink signal. The transformed downlink signal represents the downlink signal in a frequency domain. At least one sub-band of the transformed downlink signal is identified as including data to be transmitted via the distributed antenna system. The sub-band is extracted from the transformed downlink signal for transmission via the distributed antenna system.
45 Citations
16 Claims
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1. A method comprising:
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sub-dividing a downlink signal into a sub-divided downlink signal having a plurality of downlink signal components in a time domain, wherein each of the plurality of downlink signal components corresponds to a respective sub-band; determining that at least one component of the plurality of downlink signal components corresponds to at least one sub-band having data to be transmitted via a distributed antenna system; generating, subsequent to determining that the at least one component from the sub-divided downlink signal corresponds to the at least one sub-band, a transformed downlink signal by performing a frequency transform on the downlink signal, wherein the transformed downlink signal represents the downlink signal in a frequency domain; determining that the at least one sub-band of the transformed downlink signal includes the data to be transmitted; and extracting the at least one sub-band from the transformed downlink signal for transmission via the distributed antenna system; wherein extracting the at least one sub-band from the transformed downlink signal comprises; identifying, by a unit in the distributed antenna system, at least one bin of the transformed downlink signal in the frequency domain that corresponds to the at least one sub-band, providing, by the unit, data for the at least one bin to at least one remote antenna unit of the distributed antenna system, identifying, by the unit, at least one additional bin of the transformed downlink signal in the frequency domain that corresponds to at least one additional sub-band that lacks data to be transmitted, and discarding additional data for the at least one additional bin. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A unit comprising:
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a first interface section configured to receive a downlink signal from a base station; a signal processing section configured to sub-divide the downlink signal into a sub-divided downlink signal having a plurality of downlink signal components in a time domain, wherein each of the plurality of downlink signal components corresponds to a respective sub-band; a processor communicatively coupled to the first interface section and configured; determine that at least one component of the plurality of downlink signal components corresponds to at least one sub-band having data to be transmitted via a distributed antenna system; generate, subsequent to determining that the at least one component from the sub-divided downlink signal corresponds to the at least one sub-band, a transformed downlink signal by performing a frequency transform on the downlink signal, wherein the transformed downlink signal represents the downlink signal in a frequency domain, determine that the at least one sub-band of the transformed downlink signal includes the data to be transmitted, and extract the at least one sub-band from the transformed downlink signal; and a second interface section configured to provide the at least one sub-band extracted from the transformed downlink signal to at least one remote antenna unit of the distributed antenna system remote from the unit; wherein the processor is configured to extract the at least one sub-band from the transformed downlink signal by performing operations comprising; identifying at least one bin of the transformed downlink signal in the frequency domain that corresponds to the at least one sub-band, providing data for the at least one bin to the at least one remote antenna unit of the distributed antenna system, identifying at least one additional bin of the transformed downlink signal in the frequency domain that corresponds to at least one additional sub-band that lacks data to be transmitted, and discarding additional data for the at least one additional bin. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A distributed antenna system comprising:
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a unit configured to; receive a downlink signal, sub-divide the downlink signal into a sub-divided downlink signal having a plurality of downlink signal components in a time domain, wherein each of the plurality of downlink signal components corresponds to a respective sub-band, determine that at least one component of the plurality of downlink signal components corresponds to at least one sub-band having data to be transmitted via the distributed antenna system, generate, subsequent to determining that the at least one component from the sub-divided downlink signal corresponds to the at least one sub-band, a transformed downlink signal by performing a frequency transform on the downlink signal, wherein the transformed downlink signal represents the downlink signal in a frequency domain, determine that the at least one sub-band of the transformed downlink signal includes the data to be transmitted, extract the at least one sub-band from the transformed downlink signal, and provide the at least one sub-band extracted from the transformed downlink signal to at least one remote antenna unit; and the at least one remote antenna unit configured to; receive, from the unit, the at least one sub-band extracted from the transformed downlink signal, generate a wireless RF signal based on the at least one sub-band, and transmit the wireless RF signal to a terminal device; wherein the unit is configured to extract the at least one sub-band from the transformed downlink signal by performing operations comprising; identifying at least one bin of the transformed downlink signal in the frequency domain that corresponds to the at least one sub-band, providing data for the at least one bin to the at least one remote antenna unit, identifying at least one additional bin of the transformed downlink signal in the frequency domain that corresponds to at least one additional sub-band that lacks data to be transmitted, and discarding additional data for the at least one additional bin. - View Dependent Claims (15, 16)
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Specification