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Transmitter apparatus and wireless communication apparatus

A transmitter and signal technology, applied in the direction of improving amplifiers to reduce nonlinear distortion, improving amplifiers to improve efficiency, modulating electromagnetic waves, etc., can solve problems such as easy to increase nonlinear distortion

Inactive Publication Date: 2007-03-07
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, there is a problem: easy to increase nonlinear distortion

Method used

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  • Transmitter apparatus and wireless communication apparatus
  • Transmitter apparatus and wireless communication apparatus
  • Transmitter apparatus and wireless communication apparatus

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0101] FIG. 1 is a block diagram showing the structure of a transmitter according to a first embodiment of the present invention. The transmission section 10 constituting the transmitter according to the first embodiment is constituted to include: a compensation calculation section 11 for calculating distortion compensation; a linear modulator 12; a high power amplifier 13 for amplifying the transmission output from the linear modulator 12. power of the signal; and an amplitude modulation section 14 for generating power to be supplied to the high power amplifier 13 .

[0102] The compensation calculation section 11 is constituted to have: a first amplitude calculation section 15 for calculating the amplitude of the quadrature modulated digital signal in the baseband region; a compensation table 16 for storing information about each input level corresponding to the high power amplifier 13 Distortion data of positive or inverse characteristics of the output level and phase; a di...

no. 2 example

[0118] FIG. 4 is a block diagram showing the structure of a transmitter according to a second embodiment of the present invention. The transmitter section 40 according to the second embodiment is different from the structural section according to the first embodiment, and the structure of the compensation calculation section 41 is changed.

[0119] The compensation calculation section 41 includes a compensation table 42 instead of the compensation table 16 according to the first embodiment, wherein distortion data on the forward characteristic and the inverse characteristic are stored as a plurality of distortion data, and the compensation table 42 includes a forward / inverse characteristic conversion terminal 43, for inputting conversion control signals. The distortion data to be output from the compensation table 42 is converted in response to the conversion control signal input through the forward / inverse characteristic conversion terminal 43, and distortion compensation is ...

no. 3 example

[0126] Fig. 7 is a block diagram showing the structure of a transmitter according to a third embodiment of the present invention. The transmission section 50 according to the third embodiment is different from the structural section according to the first embodiment, and a compensation calculation section 51 for performing compensation of distortion in the amplitude component is provided.

[0127] The compensation calculating section 51 is constituted to have: an amplitude calculating section 15 for calculating the amplitude of the baseband quadrature modulated digital signal; a distortion table 52 for storing distortion data of the amplitude component; and a distortion adding section 53 for adding the amplitude from the amplitude The amplitude output from the calculation section 15 adds the distortion data transferred from the distortion table 52 and supplies them to the amplitude modulation section 14 . Other structures are the same as those in the first embodiment, and the ...

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Abstract

A transmitter apparatus capable of performing a high-efficiency polar coordinate modulation, while maintaining a good distortion characteristic. In the case of causing a large power amplifier (13) to operate in a saturation mode to perform a polar coordinate modulation, a switch control signal to be inputted to a multiplication / division switch terminal (33) is set to multiplication, whereby a distortion compensating part (17) multiplies quadrature modulated digital signals from I and Q input terminals (31,32) by distortion data from a compensation table (16), thereby adding a nonlinear distortion, which is equivalent to that during use of the large power amplifier (13) in a linear mode, to compress the peak factor of the modulated signals, thereby enhancing the efficiency of the polar coordinate modulation. In the case of causing the large power amplifier (13) to operate in a linear mode to perform a linear amplification, the switch control signal is set to division, whereby the distortion compensating part (17) divides the quadrature modulated digital signals by the distortion data, thereby adding a reverse distortion characteristic of the large power amplifier (13) to perform a nonlinear distortion compensation of the large power amplifier (13).

Description

technical field [0001] The present invention relates to a transmitter capable of amplifying transmission power using polar coordinate modulation and a wireless communication device using the same. Background technique [0002] In a transmitter to be used for mobile telecommunication, power efficiency and linearity in a transmission function are evaluated as indexes indicating the performance of the device. In particular, power efficiency and linearity in the transmission function are important indicators for expressing the performance of the device in a high-frequency modulation transmission device such as a cellular phone. [0003] For the amplifier in the final stage of the high-frequency modulation transmitting apparatus, an amplifier for performing a so-called class AB operation has been widely used. The class AB amplifier has little distortion, ie is good in linearity. On the other hand, power with a DC bias component is always consumed. For this reason, power effici...

Claims

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Application Information

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IPC IPC(8): H04B1/04H03C7/02H03F1/02H03F1/32H03G3/10
Inventor 齐藤典昭
Owner PANASONIC CORP
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