Predistortion control for power reduction
First Claim
Patent Images
1. A transmitter comprising:
- amplifier means for amplifying a received signal;
digital predistortion means for predistorting the received signal prior to the signal passing through said amplifier means;
transmitting means for transmitting said signal;
control means for controlling said transmitter, whereby if the power level of the signal to be transmitted by the transmitter means is below a predetermined level, the signal is not predistorted by said digital predistortion means and if the power level of the signal to be transmitted by the transmitter means is above a predetermined level said received signal passes through said digital predistortion means and said amplifier means; and
digital gain control means for applying a gain to the signal prior to the signal being input to the digital predistortion means;
whereby said digital control means is used to control the power of the signal to be transmitted.
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Accused Products
Abstract
There is provided a transmitter, and a method using such a transmitter, the transmitter having an amplifier for amplifying a received signal, predistortion means for predistorting a received signal prior to the signal passing through the amplifier means, a transmitter for transmitting a signal, and a control for controlling the transmitted. If the power level of the signal to be transmitted by the transmitter is below a predetermined level, the signal is not predistorteded by the predistortion means and if the power level of the signal to be transmitted by the transmitter is above a predetermined level the received signal passes through the predistortion means and amplifier.
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Citations
27 Claims
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1. A transmitter comprising:
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amplifier means for amplifying a received signal;
digital predistortion means for predistorting the received signal prior to the signal passing through said amplifier means;
transmitting means for transmitting said signal;
control means for controlling said transmitter, whereby if the power level of the signal to be transmitted by the transmitter means is below a predetermined level, the signal is not predistorted by said digital predistortion means and if the power level of the signal to be transmitted by the transmitter means is above a predetermined level said received signal passes through said digital predistortion means and said amplifier means; and
digital gain control means for applying a gain to the signal prior to the signal being input to the digital predistortion means;
whereby said digital control means is used to control the power of the signal to be transmitted. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A mobile station comprising a transmitter said transmitter comprising:
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amplifier means for amplifying a received signal;
digital predistortion means for predistorting a received signal prior to the signal passing through said, amplifier means;
transmitting means for transmitting a signal;
control means for controlling said transmitter, whereby if the power level of the signal to be transmitted by the transmitter means is below a predetermined level the signal is not predistorted by said digital predistortion means and if the power level of the signal to be transmitted by the transmitter means is above a predetermined level said received signal passes through said digital predistortion means and said amplifier means; and
digital gain control means for applying a gain to the signal prior to the signal being input to the digital predistortion means;
whereby said digital control means is used to control the power of the signal to be transmitted.
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20. A method for controlling a transmitter comprising the steps of:
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receiving a signal to be amplified;
controlling the gain of the signal prior to digital predistortion;
causing the signal to be predistorted if the power level of the signal to be transmitted is above a predetermined level, and not predistorting said received signal if the power level of the signal to be transmitted is below a predetermined level;
amplifying the predistorted signal and transmitting said signal;
whereby said step of controlling the gain of the signal prior to digital distortion is used to control the power of the signal to be transmitted.
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21. A transmitter comprising:
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amplifier means for amplifying a received signal;
digital predistortion means for predistorting a received signal prior to the signal passing through said amplifier means;
transmitting means for transmitting a signal;
control means for controlling said transmitter, whereby if the power level of the signal to be transmitted by the transmitter means is below a predetermined level, the signal as not predistorted by said digital predistortion means and if the power level of the signal to be transmitted by the transmitter means is above a predetermined level said received signal passes through said digital predistortion means and said amplifier means;
digital gain control means for applying a gain to the signal prior to the signal being input to the digital predistortion means; and
further gain control means for applying a further gain to the signal between the output of the digital predistortion means and the amplifier means;
whereby said digital control means is used to control the power of the signal to be transmitted.
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22. A method for controlling a transmitter comprising the steps of:
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receiving a signal to be amplified;
controlling the gain of the signal prior to digital predistortion;
causing the signal to be predistorted if the power level of the signal to he transmitted is above a predetermined level, and not predistorting said received signal if the power level of the signal to be transmitted is below a predetermined level;
further controlling the gain of the signal between the digital predistortion means and the amplifier means;
amplifying the predistorted signal; and
transmitting said signal;
whereby said step of controlling the gain of the signal prior to digital distortion is used to control the power of the signal to be transmitted.
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23. A transmitter comprising:
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amplifier means for amplifying a received signal;
predistortion means for predistorting a received signal prior to the signal passing through said amplifier means;
transmitting means for transmitting a signal;
control means for controlling said transmitter, whereby if the power level of the signal to be transmitted by the transmitter means is below a predetermined level, the signal is not predistorted by said predistortion means and if the power level of the signal to be transmitted by the transmitter means is above a predetermined level said received signal passes through said predistortion means and said amplifier means; and
a bypass path for bypassing said amplifier, whereby if the power level of a signal to be transmitted by the transmitter means is below a given level, a received signal passes through the bypass path.
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24. A method for controlling a transmitter comprising the steps of:
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receiving a signal to be amplified;
causing the signal to be predistorted if the power level of the signal to be transmitted is above a predetermined level, and not predistorting said received signal if the power level of the signal to be transmitted is below a predetermined level;
amplifying with an amplifier the predistorted signal if the signal is to be transmitted with a predetermined power level or higher and bypassing the amplifier if the signal is to be transmitted with a power level less than said predetermined level; and
transmitting said signal.
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25. A transmitter comprising:
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amplifier means for amplifying a received signal;
digital predistortion means for predistorting a received signal prior to the signal passing through said amplifier means;
transmitting means for transmitting a signal;
control means for controlling said transmitter, whereby if the power level of the signal to be transmitted by the transmitter means is below a predetermined level, the signal is not predistorted by said digital predistortion means and if the power level of the signal to be transmitted by the transmitter means is above a predetermined level said received signal passes through said digital predistortion means and said amplifier means; and
whereby if the power level of the signal to be transmitted by the transmitter means is above the predetermined level, then the amplifier means is controlled by the control means to operate in a more power efficient class.
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26. A method for controlling a transmitter comprising the steps of:
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receiving a signal to be amplified;
causing the signal to be digitally predistorted if the power level of the signal to be transmitted is above a predetermined level, and not predistorting said received signal if the power level of the signal to be transmitted is below a predetermined level;
amplifying with an amplifier the digitally predistorted signal and if the signal is to be transmitted with a predetermined power level or higher controlling the amplifier to operate in a more power efficient class; and
transmitting said signal.
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27. A transmitter comprising:
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amplifier means for amplifying a received signal;
digital predistortion means for predistorting a received signal prior to the signal passing through said amplifier means;
transmitting means for transmitting a signal;
control means for controlling said transmitter, whereby if the power level of the signal to be transmitted by the transmitter means is below a predetermined level the signal is not predistorted by said digital predistortion means and if the power level of the signal to be transmitted by the transmitter means is above a predetermined level said received signal passes through said digital predistortion means and said amplifier means; and
digital gain control means for applying a gain to the signal prior to the signal being input to the digital predistortion means;
wherein said digital gain control means only is used to control the power level of the signal to be transmitted if predistortion is applied to the signal.
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Specification