Frequency dependent I/Q impairment compensation
First Claim
1. A method of compensating for I/Q impairments in a digital signal, comprising:
- decomposing, at a wireless modem, the digital signal into a plurality of components;
scaling, at the wireless modem, a frequency domain version of a first component from the plurality of components according to a frequency dependent I/Q impairment precompensation function to obtain a precompensated frequency domain version of the first component;
combining, at the wireless modem, the precompensated frequency domain version of the first component with a frequency domain version of a second component from the plurality of components to produce a precompensated frequency domain version of the digital signal;
transforming, at the wireless modem, the precompensated frequency domain version of the digital signal to a time domain to produce a precompensated time domain version of the digital signal; and
transmitting, from the wireless modem, the precompensated time domain version of the digital signal over a wireless channel.
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Accused Products
Abstract
Methods, systems, and devices are described for compensating for transmit I/Q impairments in a digital signal. A frequency domain version of a first one of the components may be scaled at a wireless modem according to a frequency dependent I/Q impairment compensation function to obtain a compensated frequency domain version of the first one of the components. The compensated frequency domain version of the first one of the components may be combined with a frequency domain version of a second one of the components at the wireless modem to produce a compensated frequency domain version of the digital signal. The compensated frequency domain version of the digital signal may be transformed to the time domain at the wireless modem to produce a compensated time domain version of the digital signal.
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Citations
27 Claims
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1. A method of compensating for I/Q impairments in a digital signal, comprising:
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decomposing, at a wireless modem, the digital signal into a plurality of components; scaling, at the wireless modem, a frequency domain version of a first component from the plurality of components according to a frequency dependent I/Q impairment precompensation function to obtain a precompensated frequency domain version of the first component; combining, at the wireless modem, the precompensated frequency domain version of the first component with a frequency domain version of a second component from the plurality of components to produce a precompensated frequency domain version of the digital signal; transforming, at the wireless modem, the precompensated frequency domain version of the digital signal to a time domain to produce a precompensated time domain version of the digital signal; and transmitting, from the wireless modem, the precompensated time domain version of the digital signal over a wireless channel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An apparatus for compensating for I/Q impairments in a digital signal, comprising:
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means for decomposing the digital signal into a plurality of components; means for scaling a frequency domain version of a first component from the plurality of components according to a frequency dependent I/Q impairment precompensation function to obtain a precompensated frequency domain version of the first component; means for combining the precompensated frequency domain version of the first component with a frequency domain version of a second component from the plurality of components to produce a precompensated compensated frequency domain version of the digital signal; means for transforming the precompensated frequency domain version of the digital signal to a time domain at a wireless modem to produce a precompensated time domain version of the digital signal; and means for transmitting the precompensated time domain version of the digital signal from the wireless modem over a wireless channel. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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20. A wireless modem configured to compensate for transmit I/Q impairments in a digital signal comprising a plurality of components, the wireless modem comprising:
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a processor; a scaling circuit configured to scale a frequency domain version of a first component from the plurality of components according to a frequency dependent I/Q impairment precompensation function to obtain a precompensated frequency domain version of the first component; an adder circuit configured to combine the precompensated frequency domain version of the first component with a frequency domain version of a second component from the plurality of components to produce a precompensated frequency domain version of the digital signal; a transform circuit configured to transform the precompensated frequency domain version of the digital signal to a time domain to produce a precompensated time domain version of the digital signal; and a transmitter configured to transmit the precompensated time domain version of the digital signal over a wireless channel. - View Dependent Claims (21, 22, 23, 24, 25, 26)
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27. A non-transitory computer-readable storage medium storing instructions executable by at least one processor to:
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decompose a digital signal into a plurality of components; scale a frequency domain version of a first component from the plurality of components according to a frequency dependent I/Q impairment precompensation function to obtain a precompensated frequency domain version of the first component; combine the precompensated frequency domain version of the first component with a frequency domain version of a second component from the plurality of components to produce a precompensated frequency domain version of the digital signal; transform the precompensated frequency domain version of the digital signal to a time domain to produce a precompensated time domain version of the digital signal; and transmit the precompensated time domain version of the digital signal over a wireless channel.
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Specification