WO2010054499A1 - Système dpd à multiples trajets d'émetteur - Google Patents

Système dpd à multiples trajets d'émetteur Download PDF

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Publication number
WO2010054499A1
WO2010054499A1 PCT/CN2008/001868 CN2008001868W WO2010054499A1 WO 2010054499 A1 WO2010054499 A1 WO 2010054499A1 CN 2008001868 W CN2008001868 W CN 2008001868W WO 2010054499 A1 WO2010054499 A1 WO 2010054499A1
Authority
WO
WIPO (PCT)
Prior art keywords
dpd
outputs
transmitter paths
paths
process unit
Prior art date
Application number
PCT/CN2008/001868
Other languages
English (en)
Inventor
Yong Wang
Jiangyan Peng
Yazhou Li
Kelvin Xiang Gao
Xiang ZENG
Original Assignee
Telefonaktiebolaget L M Ericsson (Publ)
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Telefonaktiebolaget L M Ericsson (Publ) filed Critical Telefonaktiebolaget L M Ericsson (Publ)
Priority to PCT/CN2008/001868 priority Critical patent/WO2010054499A1/fr
Publication of WO2010054499A1 publication Critical patent/WO2010054499A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/38—Synchronous or start-stop systems, e.g. for Baudot code
    • H04L25/40—Transmitting circuits; Receiving circuits
    • H04L25/49—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
    • H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
    • H04L27/36—Modulator circuits; Transmitter circuits
    • H04L27/366—Arrangements for compensating undesirable properties of the transmission path between the modulator and the demodulator
    • H04L27/367—Arrangements for compensating undesirable properties of the transmission path between the modulator and the demodulator using predistortion

Definitions

  • the present invention is generally related to Digital Pre-Distortion (DPD) technology.
  • DPD Digital Pre-Distortion
  • the present invention is related to a DPD system with multiple transmitter paths and a method for observing multiple transmitter outputs in such a DPS system.
  • the present invention is related to a base station equipped with such a DPD system.
  • a power amplifier is important for a radio base station. Performance and cost of the power amplifier determine substantially performance and cost of the base station. Core of the power amplifier is linearization and efficiency. DPD provides the power amplifier with linear correction over wide bandwidth, which further increases the linear efficiency of the system. Therefore, Digital Pre-Distortion (DPD) technology has been becoming a critical technology in the radio base station. DPD uses a feedback path to observe more than 3 r harmonic of a useful signal.
  • Figure 1 illustrates the principle of a DPD system in a radio base station. The output signals from a power amplifier are fed back via a feedback path for linear correction by a DPD algorithm. In an existing base station which uses DPD technology, one feedback path is needed for each transmitter path's observation. In a multi-antenna system, there are usually several feedback paths with the same structure.
  • An object of particular embodiments of the present invention is to provide a DPD system with multiple transmitters which can reduce occupied space and cost of a radio base station using the DPD system.
  • a Digital Pre-Distortion (DPD) system with multiple transmitter paths is provided, each of the transmitter paths comprising a transmitter and a power amplifier coupled thereto.
  • the multiple transmitter paths are coupled to a DPD process unit at the input in parallel, the DPD process unit applying a linear correction for outputs of the transmitter paths.
  • Only one feedback path with a switch device is coupled between the DPD process unit and the outputs of the multiple transmitter paths, and the switch device is operable to multiplex the outputs from the multiple transmitter paths to the feedback path.
  • a method for observing multiple transmitter outputs in a DPD system with multiple transmitter paths The outputs from the multiple transmitter paths will be applied a linear correction in the DPD system. Only one feedback path is provided to observe the outputs from the multiple transmitter paths such that the outputs from the multiple transmitter paths are multiplexed to the feedback path.
  • a base station which is equipped with a Digital Pre-Distortion (DPD) system with multiple transmitter paths.
  • DPD Digital Pre-Distortion
  • Each of the transmitter paths comprises a transmitter and a power amplifier coupled thereto.
  • the multiple transmitter paths are coupled to a DPD process unit at the input in parallel, the DPD process unit applying a linear correction for outputs of the transmitter paths.
  • Only one feedback path with a switch device is coupled between the DPD process unit and the outputs of the multiple transmitter paths, and the switch device is operable to multiplex the outputs from the multiple transmitter paths to the feedback path.
  • embodiments of the present invention provide a solution of multiple transmitter paths sharing one feedback path.
  • the solution enables a DPD system to have a smaller size and consume much less power.
  • the solution provided by embodiments of the present invention simplifies circuit hardware with only one feedback path and thus simplifies the complexity of the design for a DPD system.
  • the DPD system according to the present invention costs much less than the traditional DPD system. Due to only one feedback path for multiple transmitter paths, the DPD system according to the present invention improves the robustness
  • Figure 1 illustrates a DPD system in a radio base station with a principle graph.
  • Figure 2 illustrates a traditional DPD system with multiple transmitters and feedback paths.
  • Figure 3 illustrates a DPD system with multiple transmitters and a single feedback path according to an embodiment of the present invention, wherein a SPMT switch is applied.
  • Figure 4 illustrates a sketch map for signals before and after the SPMT switch.
  • Figure 5 illustrates a circuit structure of the single feedback path in the DPD system illustrated in Figure 3.
  • FIG. 2 illustrates a traditional DPD system with multiple transmitter paths 1 ... N.
  • Each of the multiple transmitter paths 1 ... N comprises a transmitter 1 ... N and a power amplifier 1 ... N.
  • signals coupled from the respective power amplifier 1 ... N output are received by a different feedback path 1 ... N.
  • a DPD process unit 1 receives the signals observed by each of the feedback paths 1 ... N, and compensates nonlinearity of each of the power transmitters 1 ... N using a DPD algorithm. Then the signals, after compensation, are transmitted through the respective transmitter path 1 ... N and pass to the respective transmitter output TX Output 1 ... N.
  • feedback paths 1 to N have the same center frequency, bandwidth and circuit structure.
  • the observed signals from different feedback paths 1 ... N reach the DPD process unit 1 synchronously.
  • Figure 3 illustrates a DPD system with multiple transmitters according to an embodiment of the present invention.
  • a single feedback path 4 is shared for multiple transmitter signal observations.
  • the DPD system has a plurality of transmitter paths
  • the switch 6 may be a single pole multiple throw (SPMT) switch.
  • SPMT single pole multiple throw
  • each of the plurality of signals is transmitted along the respective transmitter path 1 ... N from the respective transmitter 31 , 32...3N to the respective power amplifier 51 , 52... 5N.
  • Each of the observed signals used for linear compensation by DPD algorithms is fed back from the respective power amplifier 51 , 52... 5N and multiplexed by the SPMT switch 6 into the combined feedback path 4.
  • the DPD process unit 2 receives the observed signals for each of the transmitter paths 1 ... N from the feedback path 4 and corrects nonlinearity of each of the power amplifier 51 , 52... 5N according to a DPD algorithm. Signals after the linear correction are transmitted through the respective transmitter path 1 ... N and reach the respective output TX OUT 1 ... N through the respective power amplifier 51 , 52... 5N.
  • the process unit 2 processes each of the feedback signals in different periods.
  • signals from different power amplifiers 51 , 52... 5N are processed in the DPD process unit in a serial mode according to the embodiment of the present invention.
  • the SPMT switch 6 turns the parallel signals from different power amplifiers 51 , 52... 5N into a serial signal under the control of a switch control signal SCS.
  • the switch control signal SCS is provided by the DPD process unit 2.
  • Table 1 shows an example of switch control states for a SPMT switch 6 with 4 ports, each of which is used to receive the output of one of 4 transmitter paths TX OUT l , TX OUT2, TX OUT3 and TX OUT4.
  • a 2-bit control signal is used as the switch control signal SCS.
  • Figure 5 illustrates a circuit structure of the single feedback path 4 in the DPD system illustrated in figure 3.
  • Outputs from each of the power amplifiers 51 , 52... 5N in the multiple transmitter paths 1 ... N are coupled to each of the ports of the SPMT switch 6.
  • the parallel outputs are turned into a serial signal which will be input to the feedback path 4.
  • the feedback path 4 comprises a mixer 41 , a filter 42 and an A/D converter 43.
  • the serial signal multiplexed by the SPMT switch 6 is down converted by the mixer 41 with outputs from a local oscillator 44.
  • the mixed serial signal is filtered by the filter 42 and converted to a digital signal with the A/D converter 43.
  • the digital signal is input to the DPD process unit 2 to have a linear correction with a DPD algorithm.
  • the DPD algorithm can use those known in the prior art.
  • the usual DPD processing mechanism will be changed according to the switch control signal SCS.
  • the linear correction process in the DPD process unit 2 must be time divisional. That is to say, during the linear correction process for one of the multiple transmitter paths 1 ... N, the linear correction process for all of the other transmitter paths 1 ... N should be suspended. With this mechanism the DPD response performance may be degraded. Such an effect should be also considered in the DPD algorithm.
  • the embodiments of the present invention can be used for example in TD-SCDMA and other Multi Input and Multi Output (MIMO) or Single Input and Multi Output (SIMO) systems, but it is not limited thereto.
  • MIMO Multi Input and Multi Output
  • SIMO Single Input and Multi Output
  • Those skilled in the art would appreciate that the present invention can be applied to all kinds of systems which need DPD to support multiple linear transmitters.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Amplifiers (AREA)
  • Transmitters (AREA)

Abstract

L'invention porte sur un système de précorrection numérique (DPD) à multiples trajets d'émetteur. Chacun des trajets d'émetteur comporte un émetteur (31, 32, … 3N) et un amplificateur de puissance (51, 52, … 5N) couplé à celui-ci. Les multiples trajets d'émetteur sont couplés à une unité de traitement DPD (2) au niveau de l'entrée en parallèle, et l'unité de traitement DPD (2) applique une correction linéaire pour des sorties des trajets d'émetteur. Un seul trajet de rétroaction (4) avec un dispositif de commutation (6) est couplé entre l'unité de traitement DPD (2) et les sorties des multiples trajets d'émetteur, et le dispositif de commutation (6) est utilisable pour multiplexer les sorties des multiples trajets d'émetteur vers le trajet de rétroaction (4).
PCT/CN2008/001868 2008-11-11 2008-11-11 Système dpd à multiples trajets d'émetteur WO2010054499A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/CN2008/001868 WO2010054499A1 (fr) 2008-11-11 2008-11-11 Système dpd à multiples trajets d'émetteur

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2008/001868 WO2010054499A1 (fr) 2008-11-11 2008-11-11 Système dpd à multiples trajets d'émetteur

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102957648A (zh) * 2011-08-19 2013-03-06 京信通信系统（中国）有限公司 多通道dpd协同切换的方法和装置
JP2013523796A (ja) * 2010-04-05 2013-06-17 フンダシオ プリバーダ インスティトゥト ディンベスティガシオ オンコロジカ バル デブロン（ウベアチェイーオー） ヒト白血病阻害因子（ｌｉｆ）を認識する抗体および望ましくない細胞増殖に関連する疾患の治療における抗ｌｉｆ抗体の使用
CN103379067A (zh) * 2012-04-26 2013-10-30 京信通信系统（中国）有限公司 功率跳动时的数字预失真方法与装置
US8837620B2 (en) 2011-05-03 2014-09-16 Optis Cellular Technology, Llc Adaptive multi-channel transmitter linearization system using a shared feedback receiver
JP2014525712A (ja) * 2011-08-26 2014-09-29 クゥアルコム・インコーポレイテッド 複数のアンテナ送信機における送信ひずみに対する較正のための適応干渉キャンセル
CN106230521A (zh) * 2016-07-20 2016-12-14 乐视控股（北京）有限公司 信号监测方法和移动终端
US10686415B2 (en) 2016-12-29 2020-06-16 Patrick Pratt Digital predistortion for multiple power amplifiers
ES2847778R1 (es) * 2020-01-30 2022-04-11 Semiconductor Components Ind Llc Acoplamiento por aire para calibración de predistorsión digital
ES2848084R1 (es) * 2020-01-30 2022-04-12 Semiconductor Components Ind Llc Muestreo directo para calibración de predistorsión digital
US11476808B2 (en) 2020-08-13 2022-10-18 Analog Devices International Unlimited Company Multi-component digital predistortion

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US5937011A (en) * 1996-03-26 1999-08-10 Airnet Communications Corp. Multi-carrier high power amplifier using digital pre-distortion
CN1384602A (zh) * 2001-05-08 2002-12-11 华为技术有限公司 自适应射频数字预失真线性化方法及其电路
WO2004049558A1 (fr) * 2002-11-22 2004-06-10 Telefonaktiebolaget Lm Ericsson (Publ) Procede d'adaptation de gain et de phase numerique en temps reel par retroaction et systeme mettant en oeuvre un tel procede
CN1604577A (zh) * 2003-09-30 2005-04-06 因芬尼昂技术股份公司 具适应性数字预失真的发射装置、具该发射装置的收发器及操作该发射装置的方法
US20050104758A1 (en) * 2003-11-14 2005-05-19 Yasuhito Funyu Distortion compensator
CN1689295A (zh) * 2002-10-31 2005-10-26 中兴通讯股份有限公司 一种宽带预失真线性化的方法与系统
CN1988522A (zh) * 2005-12-20 2007-06-27 中兴通讯股份有限公司 宽带码分多址基站系统多通道多载波数字预失真发信机

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5937011A (en) * 1996-03-26 1999-08-10 Airnet Communications Corp. Multi-carrier high power amplifier using digital pre-distortion
CN1384602A (zh) * 2001-05-08 2002-12-11 华为技术有限公司 自适应射频数字预失真线性化方法及其电路
CN1689295A (zh) * 2002-10-31 2005-10-26 中兴通讯股份有限公司 一种宽带预失真线性化的方法与系统
WO2004049558A1 (fr) * 2002-11-22 2004-06-10 Telefonaktiebolaget Lm Ericsson (Publ) Procede d'adaptation de gain et de phase numerique en temps reel par retroaction et systeme mettant en oeuvre un tel procede
CN1604577A (zh) * 2003-09-30 2005-04-06 因芬尼昂技术股份公司 具适应性数字预失真的发射装置、具该发射装置的收发器及操作该发射装置的方法
US20050104758A1 (en) * 2003-11-14 2005-05-19 Yasuhito Funyu Distortion compensator
CN1988522A (zh) * 2005-12-20 2007-06-27 中兴通讯股份有限公司 宽带码分多址基站系统多通道多载波数字预失真发信机

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013523796A (ja) * 2010-04-05 2013-06-17 フンダシオ プリバーダ インスティトゥト ディンベスティガシオ オンコロジカ バル デブロン（ウベアチェイーオー） ヒト白血病阻害因子（ｌｉｆ）を認識する抗体および望ましくない細胞増殖に関連する疾患の治療における抗ｌｉｆ抗体の使用
US8837620B2 (en) 2011-05-03 2014-09-16 Optis Cellular Technology, Llc Adaptive multi-channel transmitter linearization system using a shared feedback receiver
CN102957648A (zh) * 2011-08-19 2013-03-06 京信通信系统（中国）有限公司 多通道dpd协同切换的方法和装置
CN102957648B (zh) * 2011-08-19 2015-08-12 京信通信系统（中国）有限公司 多通道dpd协同切换的方法和装置
JP2014525712A (ja) * 2011-08-26 2014-09-29 クゥアルコム・インコーポレイテッド 複数のアンテナ送信機における送信ひずみに対する較正のための適応干渉キャンセル
CN103379067A (zh) * 2012-04-26 2013-10-30 京信通信系统（中国）有限公司 功率跳动时的数字预失真方法与装置
CN106230521A (zh) * 2016-07-20 2016-12-14 乐视控股（北京）有限公司 信号监测方法和移动终端
US10686415B2 (en) 2016-12-29 2020-06-16 Patrick Pratt Digital predistortion for multiple power amplifiers
ES2847778R1 (es) * 2020-01-30 2022-04-11 Semiconductor Components Ind Llc Acoplamiento por aire para calibración de predistorsión digital
ES2848084R1 (es) * 2020-01-30 2022-04-12 Semiconductor Components Ind Llc Muestreo directo para calibración de predistorsión digital
US11476808B2 (en) 2020-08-13 2022-10-18 Analog Devices International Unlimited Company Multi-component digital predistortion

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