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Distortion compensating apparatus, wireless communication apparatus, and distortion compensating method

A technology of distortion compensation and compensation coefficient, which is applied to the parts of the amplifying device, the layout of the negative feedback circuit, the amplifier, etc., which can solve the problems of a lot of time, expensive circuits, and complex feedback circuits.

Inactive Publication Date: 2009-12-02
FUJITSU LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in this case, the feedback circuit becomes complicated, and the circuit becomes expensive due to the need to add these elements
In addition, each TH must be adjusted to compensate for the amplitude (electric power), and a significant amount of time is required for this adjustment

Method used

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  • Distortion compensating apparatus, wireless communication apparatus, and distortion compensating method
  • Distortion compensating apparatus, wireless communication apparatus, and distortion compensating method
  • Distortion compensating apparatus, wireless communication apparatus, and distortion compensating method

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no. 1 approach

[0028] will refer to figure 1 The outline and features of the distortion compensation device according to the first embodiment are described. figure 1 is a block diagram of the distortion compensation device according to the first embodiment.

[0029] exist figure 1 The distortion compensation device described in is an amplifier used in a wireless communication device such as a cellular phone. exist figure 1 The distortion compensation device described in is a highly efficient power amplifier with high linearity and the ability to collectively amplify multiple signal channels. Specifically, in this radio communication apparatus, when a transmission signal is distorted, the distortion component constitutes leakage power to an adjacent channel, and thus causes interference to communication of the adjacent channel. Therefore, the wireless communication device includes distortion compensating means; thereby, converts the transmission signal into a high-frequency signal; th...

no. 2 approach

[0070] Although the embodiments of the present invention have been described, the present invention can be implemented in various forms other than the above-described embodiments. Therefore, various embodiments will be described below, which are respectively classified into [b-1] replacement VSWR, [b-2] temperature adjustment circuit, [b-3] system structure, and the like.

[0071] [b-1] Replace VSWR

[0072] For example, in the first embodiment, the electric power information of the signal transmitted by the antenna is output to the information measuring unit 11a by the VSWR 16a. However, the present invention is not limited to this manner, and a coupler may be used instead of the VSWR 16a. As a result, the present device (circuit) can be constructed at lower cost.

[0073] [b-2] Temperature adjustment circuit

[0074] Similar to the conventional distortion compensation device, the distortion compensation device of the present invention may also include a temperature adjust...

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Abstract

The invention relates to a distortion compensating apparatus, a wireless communication apparatus, and a distortion compensating method. The distortion compensating apparatus comprises the following units: an information measuring unit which measures a distortion component and an electric power component based on a radiation signal; a compensation coefficient calculating unit which calculates a compensation coefficient based on the distortion component and the electric power component; a signal transmitting unit which outputs a signal corrected by the compensation coefficient as a transmission signal; a signal converting unit which converts the transmission signal into a high frequency signal; an amplitude separating unit which amplifies the high frequency signal and separates a portion thereof as a signal to be fed back; a feeding-back unit which processes the separated portion and outputs the result as a feedback signal to the information measuring unit; and an electric power information extracting unit which outputs a portion of the high frequency signal as the radiation signal, extracts electric power information from the radiation signal, and directly outputs the electric power information to the information measuring unit.

Description

technical field [0001] Embodiments discussed herein relate to a distortion compensating device, a wireless communication device, and a distortion compensating method for compensating for distortion of a transmission signal in wireless communication. Background technique [0002] In general, with increased capacity and improved functionality of wireless devices comes more demands for lower power consumption, miniaturization, lower cost, and higher stability. Therefore, wireless devices are generally equipped with distortion compensation circuits in power amplifiers. [0003] In order to obtain the effect of the distortion compensation circuit, it is necessary to strengthen the stability of the distortion part and the electric power part. Therefore, a high-performance feedback circuit is used in the distortion compensation circuit (see, for example, Japanese Patent Application Laid-Open No. 2001-57522). [0004] A conventional distortion compensation circuit configured with ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/04H03F1/34
CPCH03F2200/393H03F1/3247H04B1/62H03F2200/336H03F2200/465H03F1/3294H03F2200/447H04B1/10H04B1/04
Inventor 横山敬平井浩二大川滋
Owner FUJITSU LTD
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