Transmission apparatus and wireless signal transmission method
AssigneeNEC Corporation
InventorShingo Yamanouchi
Life of this patent
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Abstract
RF input signals having mutually different carrier frequencies are input from a signal generator to a power amplifier, the power amplifier amplifying the RF input signals and outputting them as RF output signals. The signal generator has a function for reducing the PAR of the waveform combining the RF input signals. The PAR reduction of the combined waveform of the RF input signals is performed through a control on the transmission timing of the RF input signals via a delay adjuster installed in the signal generator, or through an amplitude constraint on the RF input signals via a limiter installed in the signal generator. In this manner, a transmission device with improved power efficiency is provided.
Claims12
A transmission apparatus comprising at least a signal generator that generates RF (Radio Frequency) signals on a plurality of carrier frequency bands to be transmitted, and a power amplifier that amplifies the RF signals from the signal generator,
- wherein the signal generator has a PAR reducing function of reducing a PAR (Peak-to-Average Ratio) that represents a ratio between a peak value and an average value in a combined amplitude obtained as a result of calculation in which an amplitude square value of the RF signal at each carrier frequency band is weighted with a specified gain and added with each other, the specified gain being based on a frequency characteristic of the power amplifier for each carrier frequency band.
A wireless signal transmission method for generating RF (Radio Frequency) signals on a plurality of carrier frequency bands to be transmitted, and sending out the RF signals via a power amplifier, the wireless signal transmission method comprising:
- reducing a PAR that represents a ratio between a peak value and an average value in a combined amplitude obtained as a result of calculation in which an amplitude square value of the RF signal at each carrier frequency band is weighted with a specified gain and added with each other, the specified gain being based on a frequency characteristic of the power amplifier for each carrier frequency band.
Dependencies are inferred from the claim text.