Method and apparatus for optimizing transmitter power efficiency
First Claim
1. A transmitter apparatus comprising:
- an encoder and modulator that generates an encoded and modulated transmit signal from an input signal;
a digital to analog converter, coupled to the encoder and modulator, for generating an analog representation signal of the encoded and modulated transmit signal;
an effectively continuously valued mapping function that selects an output value for a power amplifier control signal in response to a combination of a peak to average power ratio signal and a desired average transmit power signal, the effectively continuously valued mapping function comprising a table having a plurality of output values for the power amplifier control signals each with a corresponding desired transmit power value; and
a power amplifier coupled to the analog representation signal and the power amplifier control signal, at least one parameter within the power amplifier being adjusted in response to the power amplifier control signal.
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Accused Products
Abstract
A peak to average power ratio signal is generated from a first mapping function that selects the peak to average power ratio signal that corresponds to the data rate or data format of the signal to be transmitted. The selected peak to average power ratio signal is summed with a desired average transmit power signal. The resulting summation signal is input to a second effectively continuously valued mapping function comprising a table that has a plurality of power amplifier control signal values each with a corresponding peak transmit power. Each peak transmit power signal value results in a power amplifier control signal value that achieves the best possible transmitter power efficiency while still meeting out of band spurious emissions and waveform quality requirements. The summation signal value maps to one of the power amplifier control signal value that is then used to adjust a parameter such as bias of the power amplifier.
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Citations
28 Claims
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1. A transmitter apparatus comprising:
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an encoder and modulator that generates an encoded and modulated transmit signal from an input signal; a digital to analog converter, coupled to the encoder and modulator, for generating an analog representation signal of the encoded and modulated transmit signal; an effectively continuously valued mapping function that selects an output value for a power amplifier control signal in response to a combination of a peak to average power ratio signal and a desired average transmit power signal, the effectively continuously valued mapping function comprising a table having a plurality of output values for the power amplifier control signals each with a corresponding desired transmit power value; and a power amplifier coupled to the analog representation signal and the power amplifier control signal, at least one parameter within the power amplifier being adjusted in response to the power amplifier control signal. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A transmitter apparatus in a wireless mobile device, the apparatus comprising:
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an encoder and modulator that generates an encoded and modulated transmit signal from an input signal, and generates a data indicator signal corresponding to the type of encoded and modulated transmit signal; a digital to analog converter, coupled to the encoder and modulator, for generating an analog representation signal of the encoded and modulated transmit signal; a first mapping function, coupled to the encoder and modulator, that generates a peak to average power ratio signal in response to the data indicator signal; a summer that generates a peak transmit power signal by summing the peak to average power ratio signal and a desired average transmit power signal; a second mapping function that generates an effectively continuously valued power amplifier control signal in response to the peak transmit power signal, the second mapping function comprising a table having a plurality of power amplifier control signal values each corresponding to a peak transmit power value for an optimized transmitter power efficiency while still meeting out of band spurious emissions and waveform quality requirement an automatic gain control amplifier, coupled to the digital to analog converter, for generating an amplified analog representation signal in response to the desired average transmit power signal; and a power amplifier with an input port coupled to the amplified analog representation signal and a control port coupled to the power amplifier control signal, at least one parameter of the power amplifier being adjusted in response to the power amplifier control signal. - View Dependent Claims (9, 10, 11, 12)
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13. A transmitter apparatus in a wireless mobile device, the apparatus comprising:
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an encoder and modulator that generates an encoded and modulated transmit signal from an input signal, and generates a data indicator signal corresponding to the type of encoded and modulated transmit signal; a digital to analog converter, coupled to the encoder and modulator, for generating an analog representation signal of the encoded and modulated transmit signal; a first mapping function, coupled to the encoder and modulator, that generates a peak to average power ratio signal in response to the data indicator signal; a desired power indicator generator that generates a desired average transmit power signal in response to an open loop power control signal and a closed loop power control signal; a summer that generates a peak transmit power signal by summing the peak to average power ratio signal and the desired average transmit power signal; a second mapping function that generates an effectively continuously valued power amplifier control signal in response to the peak transmit power signal, the second mapping function comprising a table having a plurality of power amplifier control signal values each corresponding to a peak transmit power value for an optimized transmitter power efficiency while still meeting out of band spurious emissions and waveform quality requirement an automatic gain control amplifier, coupled to the digital to analog converter, for generating an amplified analog representation signal in response to the desired average transmit power signal; and a power amplifier with an input port coupled to the amplified analog representation signal and a control port coupled to the power amplifier control signal, at least one parameter of the power amplifier being adjusted in response to the power amplifier control signal.
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14. A transmitter apparatus comprising:
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an encoder and modulator that generates an encoded and modulated transmit signal from an input signal; a digital to analog converter, coupled to the encoder and modulator, for generating an analog representation signal of the encoded and modulated transmit signal; a plurality of mapping functions that each select an effectively continuously valued control signal for at least one device within the transmitter apparatus in response to a desired average transmit power signal or a combination of a peak to average power ratio signal and a desired average transmit power signal, the plurality of mapping functions each comprising a table having a plurality of control signal values each with a corresponding desired transmit power value; and at least one device within the transmitter having a plurality of control ports input, each control port input coupled to a multidimensional mapping function of the plurality of mapping functions such that at least one parameter of the transmitter apparatus is adjusted in response to at least one of the plurality of control signals. - View Dependent Claims (15, 16, 17, 18)
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19. A method for optimizing transmitter power efficiency in a transmitter apparatus, the method comprising:
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generating an encoded and modulated signal from a digital input signal converting the encoded and modulated signal into an analog transmit signal; generating a desired average transmit power level value, the desired average transmit power level value being derived from an open loop power control signal and a closed loop power control signal; and continuously mapping the desired average transmit power level value to a control signal value for at least one device within the transmitter apparatus to achieve an optimized transmitter power efficiency while still meeting out of band spurious emissions and waveform quality requirements. - View Dependent Claims (20, 21, 22)
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23. A method for optimizing transmitter power efficiency in a transmitter apparatus, the method comprising:
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generating an encoded and modulated signal from a digital input signal and also generating a data indicator signal corresponding to the encoded and modulated signal; converting the encoded and modulated signal into an analog transmit signal; selecting, in response to the data indicator signal, an output peak to average power ratio signal value from an array of peak to average power ratio signal values each having a corresponding data rate or data format; generating a desired average transmit power level signal value; summing the desired average transmit power level signal value and peak to average power ratio signal value to generate a peak transmit power level signal value; and continuously mapping the value of the peak transmit power level signal to a value of an at least one control signal for at least one device within said transmitter apparatus that controls at least one parameter within said transmitter apparatus to achieve an optimized power efficiency of the transmitter apparatus while still meeting out of band spurious emissions and waveform quality requirements. - View Dependent Claims (24, 25, 26, 27, 28)
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Specification