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Wireless communication device, wireless communication method and method for peak suppression

一种无线通信装置、无线通信的技术，应用在调制载波系统、分集/多天线系统、传输路径子信道分配等方向，能够解决PAPR大、功率放大器非线性失真、信号复原失败等问题，达到恶化抑制、抑制PAPR的效果

Inactive Publication Date: 2009-03-04
HITACHI LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0043] Large PAPR becomes a problem when constituting a transmitter
First, in order to respond to a wide amplitude distribution, a digital-to-analog converter (Digital to Analog Converter: DAC) with a large bit width is required, which becomes a problem in terms of price and power consumption
Second, when the analog signal is amplified after the DAC, the problem of nonlinear distortion of the power amplifier occurs
And, if the transmission of the side information fails, it will cause the restoration of all signals to fail

Method used

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  • Wireless communication device, wireless communication method and method for peak suppression
  • Wireless communication device, wireless communication method and method for peak suppression
  • Wireless communication device, wireless communication method and method for peak suppression

Examples

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Embodiment 1

[0074] Figure 9 The configuration of the wireless communication system to which the present invention is applied is shown in . The transceiver 114 transmits data to the transceiver 115 .

[0075] figure 1 The configuration of the transceiver 114 as the wireless communication device of the present invention is shown. This wireless communication device has a receiving antenna 101-1, a transmitting antenna 101-2, a received signal processing unit 102, a data restoration unit 103, a channel quality acquisition unit 104, a weight calculation unit 105, a peak suppression signal generation unit 106, and a peak detection unit 107. , a transmission signal processing unit 108 , a unitary transformation unit 109 , a signal addition unit 110 and a signal generation unit 111 .

[0076] The receiving antenna 101-1 receives signals. There is not necessarily one receiving antenna 101-1, and there may be a plurality of them.

[0077] The received signal processing unit 102 converts the ...

Embodiment 2

[0129] In this embodiment, by the weight calculation unit 105 of the first embodiment, the weight of the communication mode with good communication quality is set to 0, and the weight of the communication mode with poor communication quality is set to 1. For example, the communication modes are arranged in the order of communication quality from good to bad (SNR from high to low). If the weight of the good half of the communication quality is set to 0, and the weight of the bad half is set to 1, then it is not necessary A distorted signal is assigned to the patterns in the good half of the quality, and the same distorted signal is assigned to the patterns in the bad quality half. According to this method, it is possible to obtain the effect that the calculation can be easily performed.

[0130] In addition, as an explanatory example, the communication mode is divided into half of good quality mode and half of bad quality mode, but the parameter of the division ratio can be app...

Embodiment 3

[0132] figure 2 The configuration when the present invention is applied to an OFDM wireless communication device is shown. This wireless communication device has a receiving antenna 101-1, a transmitting antenna 101-2, a received signal processing unit 102, a data restoration unit 103, a channel quality acquisition unit 104, a weight calculation unit 105, a peak suppression signal generation unit 106, and a peak detection unit 107. , a transmission signal processing unit 108 , an inverse discrete Fourier transform unit 112 , a signal addition unit 110 , and a signal generation unit 111 .

[0133] The receiving antenna 101-1 receives signals. There is not necessarily one receiving antenna 101-1, and there may be a plurality of them.

[0134] The received signal processing unit 102 converts the received analog signal into a digital signal. The received signal processing section 102 includes: a filter for removing noise and interference waves outside the signal frequency band ...

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Abstract

A method for suppressing the peak-to-average power ratio (PAPR) while limiting deterioration in signal characteristics in wireless communication devices utilizing wireless communication methods (OFDM method, MIMO method) for multiplexing and sending multiple signals. A weight calculator unit sets a large weight for transmit signals whose channel quality is poor, relative to the weight of each base component based on the acquired channel quality. A peak detector unit detects the peak from the signal string after unitary conversion, and extracts a distortion component to apply for suppressing the peak. A peak suppression signal generation unit calculates the peak signal from the distortion component and weight of each base component, to add to each base component, and adds the peak suppression signal to each base component prior to unitary transformation.

Description

technical field [0001] The present invention relates to a wireless communication method that overlaps and transmits multiple signals—for example, an Orthogonal Frequency Division Multiplexing (OFDM) method based on discrete Fourier transform that overlaps multiple sub-carrier signals, and multiple subcarrier signals. A multiple-input multiple-output (Multiple-Input Multiple-Output: MIMO) method in which multiple signals are overlapped and signals are transmitted from multiple antennas—a wireless communication device for wireless communication. Background technique [0002] With the expansion of communication needs in recent years, communication methods are also promoting large-capacity, Orthogonal Frequency Division Multiplexing (OFDM) method and Multiple-Input Multiple-Output (Multiple-Input Multiple-Output: MIMO) method are popular focus on. [0003] In OFDM, a signal waveform output from an antenna is generated by performing an inverse discrete Fourier transform (Inverse...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04B7/02
CPCH04L27/2647H04L25/0224H04L27/2626H04L5/006H04L5/0023H04L27/2623
Inventor 早濑茂规矢野隆志田雅昭山本敬亮贾云健
Owner HITACHI LTD
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