WO2006025213A1 - ピーク電力抑圧装置およびピーク電力抑圧方法 - Google Patents
ピーク電力抑圧装置およびピーク電力抑圧方法 Download PDFInfo
- Publication number
- WO2006025213A1 WO2006025213A1 PCT/JP2005/014955 JP2005014955W WO2006025213A1 WO 2006025213 A1 WO2006025213 A1 WO 2006025213A1 JP 2005014955 W JP2005014955 W JP 2005014955W WO 2006025213 A1 WO2006025213 A1 WO 2006025213A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- peak power
- signal
- power
- distortion component
- band
- Prior art date
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Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G11/00—Limiting amplitude; Limiting rate of change of amplitude ; Clipping in general
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
- H04B1/0475—Circuits with means for limiting noise, interference or distortion
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2614—Peak power aspects
- H04L27/2623—Reduction thereof by clipping
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B2201/00—Indexing scheme relating to details of transmission systems not covered by a single group of H04B3/00 - H04B13/00
- H04B2201/69—Orthogonal indexing scheme relating to spread spectrum techniques in general
- H04B2201/707—Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation
- H04B2201/70706—Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation with means for reducing the peak-to-average power ratio
Definitions
- the present invention relates to a peak power suppression device and a peak power suppression method.
- the present invention relates to a peak power suppression device and a peak power suppression method used in a radio transmission device of (Orthogonal Frequency Division Multiplex) system.
- the OFDM method has attracted attention as a modulation method for realizing this.
- a multicarrier signal in which a plurality of subcarriers are orthogonally arranged on the frequency axis is used.
- Multi-carrier signals are obtained by combining multiple carriers and can therefore generate high peak power.
- a PAPR Peak to Average Power Ratio
- the PAPR value increases as the number of subcarriers increases.
- FIG. 1 is a block diagram showing an example of the configuration of a conventional peak power suppression apparatus that implements a clipping and filtering method.
- FIG. 2 when the amplitude value of the transmission signal becomes larger than a preset threshold value, the amplitude value is limited by clipping of the clipping unit 11.
- this processing is viewed on the frequency axis, distortion components caused by clipping the transmission signal having the spectrum shown in FIG. 3A appear in and out of the band of the transmission signal as shown in FIG. 3B.
- the out-of-band distortion component that may cause interference with the adjacent channel is removed by the filtering unit 12, and a transmission signal having a spectrum as shown in FIG. 3C is obtained.
- Patent Document 1 JP 2002-185432 A
- An object of the present invention is to provide a peak power suppression device and a peak power suppression method capable of improving the reception error rate characteristics of a reception side device.
- the peak power suppression apparatus of the present invention includes a suppression means for suppressing the peak power of a signal, an extraction means for extracting an in-band distortion component of the signal whose peak power is suppressed, and an extracted in-band distortion component. And removing means for removing the peak power from the suppressed signal.
- the peak power suppression method of the present invention includes a suppression step of suppressing a peak power of a signal, an extraction step of extracting an in-band distortion component of the signal whose peak power is suppressed, and an extracted in-band distortion. And removing a component to remove peak power from the suppressed signal.
- FIG. 1 is a block diagram showing an example of a configuration of a conventional peak power suppression device
- FIG. 3 A diagram showing a spectrum of a transmission signal according to a conventional peak power suppressor.
- FIG. 4 is a block diagram showing a configuration of a radio transmission apparatus according to Embodiment 1 of the present invention.
- FIG. 5 shows a spectrum of a transmission signal according to Embodiment 1 of the present invention.
- FIG. 6 is a block diagram showing a configuration of a radio transmission apparatus according to Embodiment 2 of the present invention.
- FIG. 7 is a block diagram showing a configuration of a wireless transmission apparatus according to Embodiment 3 of the present invention.
- FIG. 8 is a flowchart showing an operation in the radio transmitting apparatus according to Embodiment 3 of the present invention.
- FIG. 4 is a block diagram showing a configuration of a radio transmission apparatus to which the peak power suppression apparatus according to Embodiment 1 of the present invention is applied.
- the wireless transmission device 100 in FIG. 4 includes a clipping unit 102, a filtering unit 103, a subtraction circuit 104, a DZA converter 105, a frequency conversion unit 106, a power amplifier 107, a DZA converter 108, a frequency conversion unit 109, and power.
- An amplifier 110, a subtraction circuit 111, and an antenna 112 are included.
- Clipping section 102 as suppression means performs clipping for amplitude components that are equal to or greater than the threshold value of the transmission signal. Thereby, the peak power of the transmission signal is suppressed.
- Filtering section 103 filters the output signal of clipping section 102 and removes distortion components outside the band of the transmission signal.
- the DZA converter 105 the output signal of the filtering unit 103 is converted into a digital signal force analog signal.
- the frequency conversion unit 106 the output signal power of the DZA conversion 105 and the signal power of the baseband band are also frequency-converted to a signal of the RF (Radio Frequency) band.
- the output signal of the frequency conversion unit 106 is amplified.
- the subtracting circuit 104 serving as an extracting unit, the original transmission signal, that is, the transmission signal immediately before clipping is subtracted from the output signal power of the filtering unit 103, and the in-band distortion component of the transmission signal is extracted.
- the DZA converter 108 the output signal of the subtraction circuit 104, that is, the in-band distortion component, is converted into a digital signal force analog signal.
- the frequency converter 109 the output signal of the DZA converter 108 is frequency-converted from the baseband signal signal to the RF band signal.
- the output signal of the frequency converter 109 is amplified.
- the subtracting circuit 111 as a removing means the output signal power of the power amplifier 107 is also subtracted from the output signal of the power amplifier 110, whereby the transmission signal power in-band distortion component is removed.
- the transmission signal from which the in-band distortion component has been removed is wirelessly transmitted from the antenna 112.
- the transmission signal input to clipping section 102 has a spectrum as shown in FIG. 5A, for example.
- the transmission signal is subjected to clipping in the clipping unit 102.
- the threshold is determined based on the PAPR value determined by design. For example, if the PAPR value is 6 dB, the threshold is set 6 dB higher than the average signal power.
- the clipped transmission signal includes distortion components inside and outside the band of the transmission signal.
- the clipped transmission signal is subjected to filtering in filtering section 103. This process removes only out-of-band distortion components as shown in FIG. 5C. At this time, in-band distortion components remain in the transmission signal.
- the transmission signal output from filtering section 103 is subjected to DZA conversion processing and frequency conversion processing in DZA conversion 105 and frequency conversion section 106, respectively, and then amplified in power amplifier 107.
- the subtracting circuit 104 the original transmission signal is also subtracted from the output signal power of the filtering unit 103.
- the in-band distortion component of the transmission signal is extracted.
- the extracted in-band distortion component is amplified by the power amplifier 110.
- the power amplifier 110 in the sub transmission system is for amplifying only the in-band distortion component, and therefore may be an amplifier having a smaller output characteristic than the power amplifier 107 in the main transmission system.
- the subband circuit 111 subtracts the in-band distortion component as the output signal of the power amplifier 110 from the transmission signal as the output signal of the power amplifier 107.
- the in-band distortion component is removed from the transmission signal.
- the resulting transmission signal has a spectrum as shown in FIG. 5E, for example.
- the in-band distortion component is removed from the transmission signal whose peak power is suppressed, so that the reception error rate characteristic of the reception side apparatus can be improved.
- in-band distortion components are removed from the amplified transmission signal, so that peak power is regenerated on the time axis by removing in-band distortion components, and PA PR value may increase.
- the PAPR value only needs to be suppressed below the set value at the input stage of the power amplifier 107. Therefore, even if the PAPR value increases after the power amplifier 107, the back-off setting of the power amplifier 107, that is, the back that indicates the difference between the maximum amplitude level and the saturated power level in order to maintain the linearity of the power amplifier 107. This can prevent the off-value setting from being affected.
- FIG. 6 is a block diagram showing a configuration of a radio transmission apparatus to which the peak power suppression apparatus according to Embodiment 2 of the present invention is applied.
- radio transmitting apparatus 200 in FIG. 6 has the same basic configuration as radio transmitting apparatus 100 described in Embodiment 1, and therefore, the same components are denoted by the same reference numerals and detailed description thereof is omitted. Is omitted.
- the wireless transmission device 200 includes a DZA converter 201, a frequency converter 202, a substituting circuit 104, a DZA converter 108, a frequency converter 109, and a power amplifier 110 described in the first embodiment.
- a subtraction circuit 203 and a power amplifier 204 are provided, and an attenuation circuit 205 is provided.
- the original transmission signal is converted into an analog signal from the digital signal.
- frequency converter 202 the output signal of DZA converter 201 is converted from a baseband signal to an RF band signal.
- the output signal of the power amplifier 107 is attenuated.
- the subtracting circuit 203 as an extracting means, the output signal of the frequency converter 202 is subtracted from the output signal of the power amplifier 107, and the in-band distortion component of the transmission signal is extracted. At this time, the nonlinear distortion component of the power amplifier 107 is also extracted.
- the output signal of the subtraction circuit 203 is amplified.
- the in-band distortion component extraction processing is performed in the baseband band, whereas in the present embodiment, this processing is performed in the RF band.
- the output signal of the power amplifier 107 is attenuated in the attenuation circuit 205.
- the attenuated signal power is also subtracted from the transmission signal that has been subjected to the DZA conversion processing and the frequency conversion processing in the DZA conversion 201 and the frequency conversion unit 202, respectively.
- the band of the transmission signal Intra-region distortion components are extracted.
- the nonlinear distortion generated in the power amplifier 107 of the main transmission system is also taken out.
- the extracted in-band distortion component and nonlinear distortion component are amplified by the power amplifier 204. Since the power amplifier 204 of the sub transmission system is for amplifying only the in-band distortion component and the nonlinear distortion component, it may be an amplifier having a smaller output characteristic than the power amplifier 107 of the main transmission system.
- the in-band distortion component and the nonlinear distortion component as the output signal of the power amplifier 204 are transmitted to the subtraction circuit 111 from the transmission signal as the output signal of the power amplifier 107! /, Subtract.
- the subtraction circuit 111 is transmitted to the subtraction circuit 111 from the transmission signal as the output signal of the power amplifier 107! /, Subtract.
- the in-band distortion component of the amplified transmission signal not only the in-band distortion component generated by the suppression of the peak power but also the power amplifier 107
- the nonlinear distortion component generated by the amplification can also be extracted, both of the extracted distortion components can be removed, and the reception error rate characteristic of the reception side apparatus can be further improved.
- FIG. 7 is a block diagram showing the configuration of the radio transmitting apparatus according to Embodiment 3 of the present invention.
- radio transmitting apparatus 300 in FIG. 7 has the same basic configuration as radio transmitting apparatus 100 described in Embodiment 1, and therefore the same components are denoted by the same reference numerals and detailed descriptions thereof are omitted. Description is omitted.
- wireless transmission device 300 includes a power calculation unit 301, a determination unit 302, and a power supply control unit 303.
- the power calculation unit 301 serving as a measuring unit measures the power of the in-band distortion component.
- the determination unit 302 determines whether or not the measured power exceeds a threshold value.
- the power supply of power amplifier 110 is controlled based on the determination result of determination section 302. More specifically, the operation of the power amplifier 110 of the sub-transmission system is executed or stopped according to the amount of power of the in-band distortion component generated by clipping. The power of the in-band distortion component is lower than the threshold set to satisfy the predetermined error rate. If the power is large, the amplification operation of the power amplifier 110 is executed, and if it is small, the amplification operation is stopped.
- the original transmission signal and the output signal of filtering section 103 are input to subtraction circuit 104, and an in-band distortion component is extracted (step S501). Then, the in-band distortion component output from the subtraction circuit 104 is input to the power calculation unit 301.
- the power calculator 301 calculates the amount of power of the in-band distortion component (step S502). As a method for calculating the electric energy, for example, there is a method of integrating a distortion component signal of lOFDM symbol time.
- the amount of power output from the power calculation unit 301 is input to the determination unit 302.
- the determination unit 302 it is determined whether or not the electric energy is larger than a threshold value (step S503).
- the threshold value is set so that the error rate is below a certain level based on, for example, the distortion component power amount vs. error rate characteristic obtained by intensive simulation.
- the determination result of the determination unit 302 is input to the power supply control unit 303. If the amount of power is larger than the threshold (S503: YES), the power controller 303 that executes the amplification operation of the power amplifier 110 turns on the power amplifier 110 (step S504).
- the power supply control unit 303 that stops the amplification operation of the power amplifier 110 turns off the power supply of the power amplifier 110 (step S505). With this operation, it is possible to reduce the power consumption of the wireless transmission device 300 as compared with the case where the power amplifier 110 is always operated while maintaining the effect of improving the reception error rate characteristic of the reception side device.
- each functional block used in the description of each of the above embodiments is typically realized as an LSI which is an integrated circuit. These may be individually made into one chip, or may be made into one chip so as to include a part or all of them.
- IC integrated circuit
- system LSI system LSI
- super LSI non-linear LSI
- non-linear LSI depending on the difference in power integration
- the method of circuit integration is not limited to LSI, and may be realized by a dedicated circuit or a general-purpose processor.
- Field-programmable gate array FPGA
- FPGA Field-programmable gate array
- the peak power suppression device and the peak power suppression method of the present invention can be applied to an OFDM radio transmission device used in a mobile phone, a wireless LAN, and the like.
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Transmitters (AREA)
- Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
- Geophysics And Detection Of Objects (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP05772709A EP1786128A1 (en) | 2004-08-30 | 2005-08-16 | Peak power suppressing apparatus and peak power suppressing method |
US11/574,174 US20080031380A1 (en) | 2004-08-30 | 2005-08-16 | Peak Power Suppressing Apparatus and Peak Power Supressing Method |
JP2006531806A JPWO2006025213A1 (ja) | 2004-08-30 | 2005-08-16 | ピーク電力抑圧装置およびピーク電力抑圧方法 |
BRPI0515126-0A BRPI0515126A (pt) | 2004-08-30 | 2005-08-16 | aparelho de supressão de potência de crusta e método de supressão de potência de crista |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004-250523 | 2004-08-30 | ||
JP2004250523 | 2004-08-30 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2006025213A1 true WO2006025213A1 (ja) | 2006-03-09 |
Family
ID=35999871
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2005/014955 WO2006025213A1 (ja) | 2004-08-30 | 2005-08-16 | ピーク電力抑圧装置およびピーク電力抑圧方法 |
Country Status (7)
Country | Link |
---|---|
US (1) | US20080031380A1 (ja) |
EP (1) | EP1786128A1 (ja) |
JP (1) | JPWO2006025213A1 (ja) |
KR (1) | KR20070049160A (ja) |
CN (1) | CN1993913A (ja) |
BR (1) | BRPI0515126A (ja) |
WO (1) | WO2006025213A1 (ja) |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2008060846A (ja) * | 2006-08-30 | 2008-03-13 | Ntt Docomo Inc | 信号伝送装置および信号伝送方法 |
JP2008118552A (ja) * | 2006-11-07 | 2008-05-22 | Mitsubishi Electric Corp | 送信装置 |
JP2008141415A (ja) * | 2006-11-30 | 2008-06-19 | Fujitsu Ltd | 信号の帯域外電力を抑圧する送信機 |
US8811917B2 (en) | 2002-05-01 | 2014-08-19 | Dali Systems Co. Ltd. | Digital hybrid mode power amplifier system |
JP2014225871A (ja) * | 2013-05-14 | 2014-12-04 | インテル アイピー コーポレイション | 信号のピーク対平均電力比を低減する方法及びシステム |
US9026067B2 (en) | 2007-04-23 | 2015-05-05 | Dali Systems Co. Ltd. | Remotely reconfigurable power amplifier system and method |
US11129076B2 (en) | 2006-12-26 | 2021-09-21 | Dali Wireless, Inc. | Method and system for baseband predistortion linearization in multi-channel wideband communication systems |
US11159129B2 (en) | 2002-05-01 | 2021-10-26 | Dali Wireless, Inc. | Power amplifier time-delay invariant predistortion methods and apparatus |
US20220295487A1 (en) | 2010-09-14 | 2022-09-15 | Dali Wireless, Inc. | Remotely reconfigurable distributed antenna system and methods |
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US8452316B2 (en) * | 2004-06-18 | 2013-05-28 | Qualcomm Incorporated | Power control for a wireless communication system utilizing orthogonal multiplexing |
US7197692B2 (en) * | 2004-06-18 | 2007-03-27 | Qualcomm Incorporated | Robust erasure detection and erasure-rate-based closed loop power control |
US7594151B2 (en) * | 2004-06-18 | 2009-09-22 | Qualcomm, Incorporated | Reverse link power control in an orthogonal system |
US8942639B2 (en) * | 2005-03-15 | 2015-01-27 | Qualcomm Incorporated | Interference control in a wireless communication system |
US8848574B2 (en) | 2005-03-15 | 2014-09-30 | Qualcomm Incorporated | Interference control in a wireless communication system |
US7512412B2 (en) * | 2005-03-15 | 2009-03-31 | Qualcomm, Incorporated | Power control and overlapping control for a quasi-orthogonal communication system |
WO2007050926A2 (en) * | 2005-10-27 | 2007-05-03 | Qualcomm Incorporated | Method and apparatus for estimating reverse link loading in a wireless communication system |
US7664472B2 (en) * | 2006-02-23 | 2010-02-16 | Raytheon Company | Reducing the peak-to-average power ratio of a signal |
US8442572B2 (en) * | 2006-09-08 | 2013-05-14 | Qualcomm Incorporated | Method and apparatus for adjustments for delta-based power control in wireless communication systems |
US8670777B2 (en) | 2006-09-08 | 2014-03-11 | Qualcomm Incorporated | Method and apparatus for fast other sector interference (OSI) adjustment |
US8271842B2 (en) * | 2008-06-13 | 2012-09-18 | Qualcomm Incorporated | Reducing harq retransmissions using peak power management techniques |
KR20130106489A (ko) * | 2012-03-20 | 2013-09-30 | 한국전자통신연구원 | 신호왜곡성분 조절 장치 및 방법과 이를 이용한 시스템 |
CN113836855B (zh) * | 2021-08-30 | 2023-08-25 | 北京钛方科技有限责任公司 | 饱和信号特征修正方法、装置、电子设备和存储介质 |
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- 2005-08-16 KR KR1020077003124A patent/KR20070049160A/ko not_active Application Discontinuation
- 2005-08-16 US US11/574,174 patent/US20080031380A1/en not_active Abandoned
- 2005-08-16 CN CNA2005800266451A patent/CN1993913A/zh active Pending
- 2005-08-16 WO PCT/JP2005/014955 patent/WO2006025213A1/ja not_active Application Discontinuation
- 2005-08-16 BR BRPI0515126-0A patent/BRPI0515126A/pt not_active Application Discontinuation
- 2005-08-16 EP EP05772709A patent/EP1786128A1/en not_active Withdrawn
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Cited By (12)
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US8811917B2 (en) | 2002-05-01 | 2014-08-19 | Dali Systems Co. Ltd. | Digital hybrid mode power amplifier system |
US11159129B2 (en) | 2002-05-01 | 2021-10-26 | Dali Wireless, Inc. | Power amplifier time-delay invariant predistortion methods and apparatus |
US11418155B2 (en) | 2002-05-01 | 2022-08-16 | Dali Wireless, Inc. | Digital hybrid mode power amplifier system |
JP2008060846A (ja) * | 2006-08-30 | 2008-03-13 | Ntt Docomo Inc | 信号伝送装置および信号伝送方法 |
JP2008118552A (ja) * | 2006-11-07 | 2008-05-22 | Mitsubishi Electric Corp | 送信装置 |
JP2008141415A (ja) * | 2006-11-30 | 2008-06-19 | Fujitsu Ltd | 信号の帯域外電力を抑圧する送信機 |
US11129076B2 (en) | 2006-12-26 | 2021-09-21 | Dali Wireless, Inc. | Method and system for baseband predistortion linearization in multi-channel wideband communication systems |
US9026067B2 (en) | 2007-04-23 | 2015-05-05 | Dali Systems Co. Ltd. | Remotely reconfigurable power amplifier system and method |
US9768739B2 (en) | 2008-03-31 | 2017-09-19 | Dali Systems Co. Ltd. | Digital hybrid mode power amplifier system |
US20220295487A1 (en) | 2010-09-14 | 2022-09-15 | Dali Wireless, Inc. | Remotely reconfigurable distributed antenna system and methods |
US11805504B2 (en) | 2010-09-14 | 2023-10-31 | Dali Wireless, Inc. | Remotely reconfigurable distributed antenna system and methods |
JP2014225871A (ja) * | 2013-05-14 | 2014-12-04 | インテル アイピー コーポレイション | 信号のピーク対平均電力比を低減する方法及びシステム |
Also Published As
Publication number | Publication date |
---|---|
EP1786128A1 (en) | 2007-05-16 |
CN1993913A (zh) | 2007-07-04 |
US20080031380A1 (en) | 2008-02-07 |
KR20070049160A (ko) | 2007-05-10 |
JPWO2006025213A1 (ja) | 2008-05-08 |
BRPI0515126A (pt) | 2008-07-08 |
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