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Wireless communication apparatus

A wireless communication device and wireless technology, applied in electrical components, sustainable buildings, power amplifiers, etc., can solve problems such as increased power consumption and reduced power consumption

Inactive Publication Date: 2010-09-29
HITACHI LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the multi-valued modulation method, due to the high linearity required, the wireless terminal mostly uses a linear amplifier, but its power efficiency is at most 40-45%, and when it is averaged over the entire range of output power, it is obviously deteriorated to 8-10%, and the power consumption growth becomes a problem
In particular, in battery-driven portable terminals, continuous operation time is affected, so reduction in power consumption (i.e., improvement in power efficiency) is a major issue

Method used

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  • Wireless communication apparatus
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Examples

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Embodiment Construction

[0026] First, through figure 1 The configuration of a general terminal used in a wireless communication system will be described. The reception signal received from the antenna 107 is separately transmitted and received by the antenna switch (or duplexer) in the front end unit 101, filtered, and frequency converted in the wireless unit 102 to fall into the baseband frequency band. Then, the signal is converted into a digital signal in the interface unit 103, demodulated by the baseband unit 104, output through the user interface unit 105, and supplied to subsequent processing. The transmission signal to the base station is input to the baseband unit 104 via the user interface unit 105, and undergoes modulation processing such as error correction coding. Thereafter, the transmission signal is converted into an analog signal in the interface unit 103 , converted into a frequency signal of a desired frequency band in the wireless unit 102 , filtered by the front end unit 101 , ...

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Abstract

A linear system and an EER system are used in combination such that the EER system can also be used in a cellular phone with a wide output dynamic range. In the EER system, linear control of an amplifier (909) becomes difficult in the low output range. Thus, use of the EER system is limited to the high output range, and the linear system is used in the low output range as in the past. The power efficiency is improved while requirements of linearity are satisfied by this structure. An effective circuit structure is proposed for a switching control system for two systems. In addition, an up-converter (911) is constituted in combination with a step-down element (912) with high responsiveness, whereby a power supply voltage control circuit for the EER system with a wide control range and highresponsiveness is provided.

Description

[0001] This application is a divisional application of the application with the application number 03155422.9, the application date is September 5, 2003, and the invention title is "wireless communication device". technical field [0002] The present invention relates to a device for transmitting in a wireless communication system such as a mobile phone and a wireless LAN, and the structure of an integrated circuit used as a component in the device. In particular, it is suitable for use as a wireless communication device in a wireless communication system using a modulation system that transmits information by changing both phase and amplitude. Background technique [0003] First, use Figure 7 Explain the relationship between the input and output characteristics of the power amplifier and the power efficiency, which greatly affects the power efficiency of the entire transmission device due to the increase in power consumption in the transmission device for wireless communica...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/20H03F3/24H03F1/02H03G3/30H04B1/04
CPCY02B60/50
Inventor 鈴木芽衣田中聡山脇大造田上知紀
Owner HITACHI LTD