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US 7,889,798 B2Granted
PAR reduction for EDGE clipper
AssigneeNokia Corporation
InventorsOlli Piirainen, Miia Karjalainen
Life of this patent
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Abstract
A method of reducing the peak-to-mean ratio of a multi-carrier signal includes the steps of: generating a residual signal from the multicarrier signal, the residual signal representing the difference between the multicarrier signal and a hard-clipped multicarrier signal. The method also includes the steps of applying a least squares function to the residual signal for each carrier of the multi-carrier signal, thereby generating a minimized residual signal for each carrier and combining the minimized residual signals and the multicarrier signal.
Claims20
A method comprising:
- generating a residual signal from a multicarrier signal, the residual signal representing a difference between the multicarrier signal and a hard-clipped multicarrier signal;
- applying a least squares function to the residual signal for at least one carrier of the multicarrier signal, thereby generating a minimized residual signal for each of the at least one carrier;
- filtering the minimized residual signals;
- and
- combining the filtered minimized residual signals and the multicarrier signal.
2 more elements
An apparatus comprising:
- a generator configured to generate a residual signal from a multicarrier signal, the residual signal representing a difference between the multicarrier signal and a hard-clipped multicarrier signal;
- an applying unit configured to apply a least squares function to the residual signal for at least one carrier of the multicarrier signal, thereby generating a minimized residual signal for each of the at least one carrier;
- at least one filter, the at least one filter configured to filter the minimized residual signals;
- and
- a combining unit configured to combine the filtered minimized residual signals and the multicarrier signal.
2 more elements
A system comprising:
- a transmitter apparatus configured to reduce a peak-to-mean ratio of a multicarrier signal;
- a generating unit configured to generate a residual signal from a multicarrier signal, the residual signal representing a difference between the multicarrier signal and a hard-clipped multicarrier signal;
- an applying unit configured to apply a least squares function to the residual signal for at least one carrier of the multicarrier signal, thereby generating a minimized residual signal for each of the at least one carrier;
- at least one filter, the at least one filter configured to filter the minimized residual signals;
- and
- a combining unit configured to combine the filtered minimized residual signals and the multicarrier signal.
3 more elements
An apparatus comprising:
- generating means for generating a residual signal from a multicarrier signal, the residual signal representing a difference between the multicarrier signal and a hard-clipped multicarrier signal;
- applying means for applying a least squares function to the residual signal for at least one carrier of the multicarrier signal, thereby generating a minimized residual signal for each of the at least one carrier;
- filtering means for filtering the minimized residual signals;
- and
- combining means for combining the filtered minimized residual signals and the multicarrier signal.
2 more elements
A system comprising:
- transmitting means for reducing a peak-to-mean ratio of a multicarrier signal;
- generating means for generating a residual signal from the multicarrier signal, the residual signal representing a difference between the multicarrier signal and a hard-clipped multicarrier signal;
- applying means for applying a least squares function to the residual signal for at least one carrier of the multicarrier signal, thereby generating a minimized residual signal for each of the at least one carrier;
- filtering means for filtering the minimized residual signals;
- and
- combining means for combining the filtered minimized residual signals and the multicarrier signal.
3 more elements
An apparatus comprising:
- a generator configured to generate a residual signal from a multicarrier signal, the residual signal representing a difference between the multicarrier signal and a hard-clipped multicarrier signal;
- a least squares fitter configured to apply a least squares function to the residual signal for at least one carrier of the multi-carrier signal, thereby generating a minimized residual signal for each of the at least one carrier;
- at least one filter, the at least one filter configured to filter the minimized residual signals;
- and
- a summer configured to combine the filtered minimized residual signals and the multicarrier signal.
2 more elements
Dependencies are inferred from the claim text.