Host device preventing distortion of optical signal due to nonlinear noise, and distributed antenna system including the host device
AssigneeElectronics and Telecommunications Research Institute
InventorMinkyu SUNG
Life of this patent
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Abstract
A host device uses an intermediate frequency determined based on frequencies of a second-order nonlinear intermodulation distortion component and a harmonic component which are generated in an analog optical link connected to the host device, for example, an analog optical link of a distributed antenna system (DAS), and precompensates for the second-order nonlinear intermodulation distortion component and the harmonic component generated in the analog optical link.
Claims11
A method of processing an analog electrical signal to be performed by a host device connected to remote radio heads (RRHs), the method comprising:
- receiving analog electrical signals respectively from the RRHs;
- allocating, to an intermediate frequency, the analog electrical signals by intermediate frequency converters respectively corresponding to the RRHs;
- multiplexing, by a channel aggregator, the analog electrical signals allocated to the intermediate frequency;
- performing, by a precompensator, a precompensation on an analog electrical signal obtained through the multiplexing to remove a second-order nonlinear intermodulation distortion component and a harmonic component with a frequency greater than or equal to the intermediate frequency which are generated in an analog optical link connected to the host device;
- and
- converting, by an analog, optical transmitter, an analog electrical signal obtained through the precompensation to an analog optical signal to be output to the analog optical link.
A method of processing an analog electrical signal to be performed by a host device connected to remote radio heads (RRHs), the method comprising:
- receiving analog electrical signals respectively from the RRHs;
- allocating, to an intermediate frequency, the analog electrical signals by intermediate frequency converters respectively corresponding to the RRHs;
- multiplexing, by a channel aggregator, the analog electrical signals allocated to the intermediate frequency;
- converting, by an analog-to-digital converter (ADC), an analog electrical signal obtained through the multiplexing to a digital electrical signal;
- performing, by a precompensator, a precompensation on the digital electrical signal to remove a second-order nonlinear intermodulation distortion component and a harmonic component with a frequency greater than or equal to the intermediate frequency which are generated in an analog optical link connected to the host device;
- converting, by a digital-to-analog converter (DAC), a digital electrical signal obtained through the precompensation to an analog electrical signal;
- and
- converting, by an analog optical transmitter, the analog electrical signal obtained through the converting to an analog optical signal to be output to the analog optical link.
A host device connected to remote radio heads (RRHs), comprising:
- intermediate frequency converters respectively corresponding to the RRHs, and each configured to convert a frequency of an analog electrical signal received from a corresponding RRH of the RRHs to an intermediate frequency corresponding to the RRH;
- a channel aggregator configured, to multiplex analog electrical signals output from the intermediate frequency converters;
- a precompensator configured to perform a precompensation on an analog electrical signal obtained through the multiplexing to remove a second-order nonlinear intermodulation distortion component and a harmonic component with a frequency greater than or equal to the intermediate frequency which are generated in an analog optical link connected to the host device;
- and
- an analog optical transmitter configured to convert an analog electrical signal obtained through the precompensation to an analog optical signal to be output to the analog optical link.
Dependencies are inferred from the claim text.