WO2011093511A1 - Système de communication sans fil, émetteur et procédé de communication à porteuses multiples - Google Patents

Système de communication sans fil, émetteur et procédé de communication à porteuses multiples Download PDF

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Publication number
WO2011093511A1
WO2011093511A1 PCT/JP2011/052075 JP2011052075W WO2011093511A1 WO 2011093511 A1 WO2011093511 A1 WO 2011093511A1 JP 2011052075 W JP2011052075 W JP 2011052075W WO 2011093511 A1 WO2011093511 A1 WO 2011093511A1
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Prior art keywords
signals
digital signal
communication system
transmitter
complex
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PCT/JP2011/052075
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English (en)
Japanese (ja)
Inventor
高木　直
亀田　卓
坪内　和夫
細谷　健一
丸橋　建一
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日本電気株式会社
国立大学法人東北大学
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Application filed by 日本電気株式会社, 国立大学法人東北大学 filed Critical 日本電気株式会社
Priority to JP2011551967A priority Critical patent/JP5799463B2/ja
Publication of WO2011093511A1 publication Critical patent/WO2011093511A1/fr

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    • 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
    • H04L27/2626—Arrangements specific to the transmitter only
    • H04L27/2627—Modulators
    • H04L27/2637—Modulators with direct modulation of individual subcarriers
    • 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
    • H04L27/30—Systems using multi-frequency codes wherein each code element is represented by a combination of frequencies

Definitions

  • the present invention relates to a high-speed wireless communication system using a multicarrier with high frequency utilization efficiency such as OFDM (Orthogonal Frequency Domain Modulation), and more particularly to a transmitter using an RF amplifier with high power efficiency.
  • OFDM Orthogonal Frequency Domain Modulation
  • the OFDM wireless communication system is currently used in a wireless local area network (LAN) and is one of methods for realizing high-speed wireless communication.
  • a general configuration of a transmitter used in an existing OFDM wireless communication system is described in Non-Patent Document 1, for example.
  • a transmitter used in the OFDM wireless communication system disclosed in Non-Patent Document 1 is shown in FIG.
  • an input digital signal sequence t ⁇ D ⁇ is converted into a parallel complex symbol sequence ⁇ S ⁇ by a symbol mapper 100 and a serial-parallel converter 101.
  • the parallel complex symbol sequence ⁇ S ⁇ is subjected to matrix calculation processing by the frequency mapper 102, the inverse discrete Fourier transformer 103, and the parallel-serial converter 104.
  • a complex OFDM symbol sample value sequence t ⁇ V ⁇ is generated.
  • An appropriate guard interval is added to the complex OFDM symbol sample value sequence t ⁇ V ⁇ by the guard interval circuit 105 and further converted into a complex analog OFDM signal V BB (t) by the DA converter 106.
  • the complex analog OFDM signal V BB (t) is converted into a quadrature modulated RF signal V RF (t) by a quadrature modulator 109 including a quadrature modulation mixer 107 and a local oscillator 108.
  • the RF signal V RF (t) is amplified to a high output by the RF amplifier 110 and is transmitted from the antenna 111 to the space.
  • the OFDM wireless communication system having the above configuration generally has excellent characteristics such as high frequency utilization efficiency and resistance to multipath fading by providing an appropriate guard interval.
  • the configuration of the OFDM modulation circuit used in the OFDM wireless communication system is also described in Patent Document 1.
  • the input signal sequence is divided into a plurality of systems and assigned to each subcarrier, and then the D / A conversion circuit and the orthogonal modulation circuit of each system are used. Then, a plurality of systems are input to the synthesizer, and an output signal input to the amplifier is generated.
  • the RF signal V RF (t) input to the RF amplifier is a multi-carrier modulation signal including a large number of carriers, and the peak power with respect to the average power of the signal.
  • PAPR Peak to Average Power Ratio
  • FIG. 11 is an example of output power and power efficiency characteristics of an amplifier in a wireless communication system.
  • the power efficiency of an amplifier is generally maximized when operating at a saturated output power level and significantly decreases when operated with a large backoff from saturation. The increase in power consumption resulting from this result becomes a problem for the wireless communication system.
  • a high-power amplifier having a large saturation output power is required to construct a wireless communication system.
  • an input digital signal sequence is serial-parallel converted and input to a plurality of DA converters, and analog signals obtained from the plurality of DA converters are combined into an input system.
  • a signal synthesizer that combines two or more outputs, a plurality of quadrature modulation mixers that modulate the analog signals combined and output by the signal synthesizer into a quadrature-modulated RF signal, and the plurality of quadrature modulation mixers
  • a transmitter that performs multicarrier communication, and includes a plurality of RF amplifiers that individually amplify a plurality of orthogonally modulated RF signals in correspondence with subcarrier frequencies.
  • a multi-carrier communication method in a communication system using a multicarrier modulation signal, a transmitter, a wireless communication system, and a transmitter that realize high power efficiency while reducing backoff of an RF amplifier used in the transmitter and maintaining high frequency utilization efficiency
  • a multi-carrier communication method can be provided.
  • a local oscillator having a common frequency or a common local oscillator can be used.
  • FIG. 1 is a configuration diagram of a transmitter of a wireless communication system according to the first embodiment of the present invention.
  • FIG. 2 is a configuration diagram of the transmitter of the wireless communication system according to the third embodiment of the present invention.
  • FIG. 3 is a configuration diagram of the transmitter of the radio communication system according to the fourth embodiment of the present invention.
  • FIG. 4 is a configuration diagram of a transmitter of a wireless communication system according to the fifth embodiment of the present invention.
  • FIG. 5 is a configuration diagram of the transmitter of the wireless communication system according to the sixth embodiment of the present invention.
  • FIG. 6 is an explanatory diagram showing the state of signals when the windowing processing circuit according to the present invention is loaded.
  • FIG. 7 is a configuration diagram of a transmitter of a wireless communication system according to the seventh embodiment of the present invention.
  • FIG. 8 is a configuration diagram of the transmitter of the wireless communication system according to the eighth embodiment of the present invention.
  • FIG. 9 is a configuration diagram of a transmitter of a wireless communication system according to the ninth embodiment of the present invention.
  • FIG. 10 is a general configuration diagram of a transmitter used in an OFDM wireless communication system.
  • FIG. 11 is an explanatory diagram illustrating an example of output power and power efficiency characteristics of an amplifier.
  • FIG. 1 is a configuration diagram of a transmitter of a wireless communication system according to the first embodiment of the present invention.
  • the illustrated transmitter includes a symbol mapper 1 that converts an input digital signal sequence t ⁇ D ⁇ into a complex symbol sequence, and a serial-parallel converter 2 that converts the generated complex symbol sequence into parallel complex symbols (S).
  • the frequency mapper 3 for assigning individual frequencies to each of the complex symbols (s 0 to s N-1 ) included in the parallel complex symbol (S), and the phase rotation corresponding to the assigned frequency, respectively.
  • the complex digital signal sampled sequence (t ⁇ v 0 ⁇ ⁇ t ⁇ v N-1 ⁇ ) digital signal processing circuit 4 for generating the generated complex digital signal samples train (t ⁇ v 0 ⁇ ⁇ t ⁇ v N- 1 ⁇ ) are converted from complex analog signals (V BB.0 (t) to V BB.N-1 (t)), and output from the plurality of DA converters, respectively.
  • N complex ana Grayed signal (V BB.0 (t) ⁇ V BB.N-1 (t)) and a combiner 16 for combining the M signals, the real part from each of the complex analog signal is quadrature gathered into M
  • a plurality of orthogonal modulation mixers 6 that generate modulated RF signals (V RF.0 (t) to V RF.M-1 (t)), and a plurality of local oscillation signals that supply local oscillation signals to the respective orthogonal modulation mixers.
  • the digital signal processing circuit 4 operates as signal processing means.
  • the DA converter 5 operates as DA conversion means.
  • the synthesizer 16 operates as a signal synthesizer.
  • a set of the quadrature modulation mixer 6 and the local oscillator 7 operates as a set of quadrature modulation means or circuit.
  • the RF amplifier 8 operates as RF amplification means or a circuit. Next, the operation will be described.
  • the input digital signal sequence t ⁇ D ⁇ is converted into a parallel complex symbol (s) including N complex symbols (s 0 to s N-1 ) by the symbol mapper 1 and the serial-parallel converter 2.
  • an individual frequency (f 0 , f 1 ,..., F k ,..., F N ⁇ 1 ) is assigned to each complex symbol (s 0 to s N ⁇ 1 ) by the frequency mapper 3,
  • the digital signal processing circuit 4 generates a complex digital signal sample sequence t (v) to which a phase rotation corresponding to each assigned frequency is given.
  • f k (1 ⁇ k ⁇ N ⁇ 1) shown as the phase term in (3) and (5) corresponds to the frequency given by this operation.
  • the N complex digital signal sample sequences ( t ⁇ v 0 ⁇ to t ⁇ v N ⁇ 1 ⁇ ) are respectively converted into complex analog signals (V BB.0 (t) to V BB.N ⁇ by the DA converter 5. 1 (t)).
  • the N complex analog signals (V BB.0 (t) to V BB.N-1 (t)) output from each DA converter 5 are combined into M signals by the synthesizer 16 and synthesized.
  • the combined complex analog signal is converted into an RF signal (V RF.0 (t) to V RF.M-1 (t)) that is quadrature modulated by the quadrature modulation mixer 6 and the local oscillator 7.
  • the quadrature-modulated RF signals (V RF.0 (t) to V RF.M ⁇ 1 (t)) are respectively amplified by the RF amplifier 8 and transmitted from the antenna 9 to the air.
  • V RF.0 (t) to V RF.M ⁇ 1 (t) are respectively amplified by the RF amplifier 8 and transmitted from the antenna 9 to the air.
  • the power consumption of the transmitter can be reduced while maintaining frequency use efficiency, and high frequency use can be achieved.
  • the power consumption per bit can be reduced while maintaining the efficiency (bit / Hz).
  • the matrix (F ⁇ 1 ) is an inverse discrete Fourier transform matrix (IDFT), and the matrix (F) is a discrete Fourier transform matrix (DFT).
  • IDFT inverse discrete Fourier transform matrix
  • DFT discrete Fourier transform matrix
  • RF signals (V RF.0 (t) to V RF.M-1 ) orthogonally modulated from each of the complex digital signal sample sequences ( t ⁇ v 0 ⁇ to t ⁇ v N ⁇ 1 ⁇ ). (T)) can be generated and each RF signal (V RF.0 (t) to V RF.N-1 (t)) can be individually amplified, which is a problem with existing OFDM modulated signals.
  • the problem of large PAPR is reduced.
  • FIG. 2 is a configuration diagram of the transmitter of the wireless communication system according to the third embodiment of the present invention. The difference from the configuration of FIG. 1 is that a local oscillator that supplies local oscillation signals to N orthogonal modulation mixers 6 is configured by a single common local oscillator 10 that generates a common local oscillation signal. is there. Next, the operation will be described.
  • each frequency (f 0 , f 1 ) is divided by the frequency mapper 3 for each of the complex symbols (s 0 to s N-1 ) included in the parallel complex symbols (S). 1 ,..., F k ,..., F N ⁇ 1 ), and further, a complex digital signal sample sequence ( t) given a phase rotation corresponding to each assigned frequency by the digital signal processing circuit 4 ⁇ V 0 ⁇ to t ⁇ v N ⁇ 1 ⁇ ).
  • the local signal supplied to each quadrature modulation mixer 6 in FIG. 2 may have the same frequency.
  • one common local oscillator 10 can be used.
  • FIG. 3 is a configuration diagram of a radio communication system according to the fourth embodiment of the present invention. Compared with the configuration of FIG. 1 and FIG. 2, a plurality of power combiners 11 for combining the RF signals individually amplified by each RF amplifier 8, and the combined RF signals corresponding to each power combiner 11. Is different in that it includes a plurality of antennas 12 that transmit the signal to the air. Next, the operation will be described.
  • a plurality of RF signals individually amplified by each RF amplifier 8 are combined by the power combiner 11 and then transmitted from the antenna 12 to the air, so that the number of antennas to be used can be reduced.
  • the configuration shown in FIG. 3 is an example in which all of the RF signals individually amplified by each RF amplifier 8 are combined by one power combiner and transmitted from one antenna to the air.
  • a plurality of power combiners may be used.
  • the number n of the power combiners 11 is the number of input systems that is the number of RF amplifiers 8> n ⁇ 1.
  • FIG. 4 is a configuration diagram of a radio communication system according to the fifth embodiment of the present invention. Compared with FIGS. 1 to 3, the transmitter of the wireless communication system in FIG.
  • FIG. 5 is a configuration diagram of a radio communication system according to the sixth embodiment of the present invention. Compared to FIG. 4, the windowing processing circuit 14 is loaded between the guard interval circuit 13 and the plurality of DA converters 5.
  • FIG. 6 is a diagram showing the state of signals when the windowing processing circuit 14 is loaded. As shown in FIG.
  • FIG. 7 is a configuration diagram of a transmitter of a wireless communication system according to the seventh embodiment of the present invention.
  • the illustrated transmitter includes a symbol mapper 1 that converts an input digital signal sequence t ⁇ D ⁇ into a complex symbol sequence, and a serial-parallel converter 2 that converts the generated complex symbol sequence into parallel complex symbols (S).
  • the frequency mapper 3 for assigning individual frequencies to each of the complex symbols (s 0 to s N-1 ) included in the parallel complex symbol (S), and the phase rotation corresponding to the assigned frequency, respectively.
  • Digital signal processing circuit 4 for generating a complex digital signal sample sequence, a filter 15 for limiting the band of each complex digital signal sample sequence, and a complex analog signal (V BB.0 ( t) ⁇ V BB.N-1 ( t)) and the N DA converter 5 for converting into, the N complex analog signals output from the DA converter 5 (V B .0 (t) ⁇ V BB.N- 1 (t)) and the synthesizer 16 for synthesizing, synthesized the orthogonal modulated RF signal from the signal (V RF.0 (t) ⁇ V RF.M ⁇ 1 (t)), a plurality of local oscillators 7 for supplying local signals to the respective quadrature modulation mixers, and RF signals (V RF.0 (t ) To V RF.M-1 (t)), and a plurality of RF amplifiers 8 and antennas 9 for transmitting the amplified RF signals to the air.
  • the transmitter according to the seventh embodiment is different from the transmitter according to the first embodiment in that the filter 15 is provided.
  • the input digital signal sequence t ⁇ D ⁇ is converted into N complex symbols (s 0 to s N-1 ) by the symbol mapper 1 and the serial / parallel converter 2.
  • an individual frequency (f 0 , f 1 ,..., F k ,..., F N ⁇ 1 ) is assigned to each complex symbol (s 0 to s N ⁇ 1 ) by the frequency mapper 3
  • the digital signal processing circuit 4 applies a phase rotation corresponding to each assigned frequency to generate a complex digital signal sample sequence ( t ⁇ v 0 ⁇ to t ⁇ v N ⁇ 1 ⁇ ).
  • each complex symbol is expanded to a different frequency domain, and phase rotation is given to each so that a single carrier signal that can be individually demodulated can be generated.
  • N complex digital signal sample sequences ( t ⁇ V 0 ⁇ to t ⁇ v N ⁇ 1 ⁇ ) are generated.
  • the band of each complex digital signal sample sequence ( t ⁇ v 0 ⁇ to t ⁇ v N ⁇ 1 ⁇ ) is limited by the filter 15.
  • a roll-off filter is used as the filter 15.
  • each of the filtered complex digital signal sample sequences ( t ⁇ v 0 ⁇ to t ⁇ v N ⁇ 1 ⁇ ) is respectively converted into a complex analog signal (V BB.0 (t) to V BB.N by the DA converter 5. -1 (t)).
  • the combined complex analog signals are further converted into RF signals (V RF.0 (t) to V RF.M-1 (t)) that are quadrature modulated by the quadrature modulation mixer 6 and the local oscillator 7.
  • the quadrature-modulated RF signals (V RF.0 (t) to V RF.M-1 (t)) are further amplified by the RF amplifier 8 and transmitted from the antenna 9 into the air.
  • the quadrature modulated RF signals (V RF.0 (t) to V RF.M-1 (t)) amplified by the respective RF amplifiers 8 are single carrier modulation signals.
  • single carrier modulation for example, BPSK, QPSK, 8PSK, 16QAM, and 64QAM are applicable.
  • FIG. 8 is a configuration diagram of the transmitter of the wireless communication system according to the eighth embodiment of the present invention. The difference from the configuration of FIG. 7 is that a local oscillator that supplies local signals to N orthogonal modulation mixers 6 is configured by a single common local oscillator 10. Next, the operation will be described.
  • individual frequencies f 0 , f 1 ,..., F k ,..., F N ⁇ 1 ) are assigned to each parallel complex symbol s k. ing.
  • the digital signal processing circuit 4 provides phase rotation so that each complex symbol is developed in a separate frequency domain and can be individually demodulated, and as a result, N pieces of signals are generated.
  • complex digital signal samples train (t ⁇ v 0 ⁇ ⁇ t ⁇ v N-1 ⁇ ) is generated.
  • the local signal supplied to each quadrature modulation mixer 6 in FIG. 8 may have the same frequency.
  • one common local oscillator 10 can be used. Since only one local oscillator is required, the size can be reduced, and there is an advantage that the configuration can be simplified because it is not necessary to consider the frequency deviation between the local signals supplied to each quadrature modulation mixer 6.
  • a function capable of outputting a complex digital signal sample sequence corresponding to a multi-carrier communication system other than OFDM and OFDM is prepared in the circuit in advance in the signal processing circuit 4 ′. As a result, it is possible to selectively use the control signal according to the situation, and it is possible to realize that one wireless device supports two systems.
  • each of the N complex symbols is assigned to each of the N complex symbols, combined into a total of M signals (M ⁇ N), and further orthogonal modulation is performed. Then, each quadrature-modulated RF signal is individually amplified.
  • M ⁇ N M signals
  • each quadrature-modulated RF signal is individually amplified.
  • the signal processing circuit 4 and the signal processing circuit 4 ′ in the OFDM communication system and the filter 15 in the multicarrier communication system shown in the seventh and eighth embodiments are digital circuits. It is possible to change the presence / absence of the circuit and the order. On the other hand, it is desirable that the RF amplifier is provided at a stage subsequent to the quadrature modulator. Therefore, it is necessary to provide a process (combining) for grouping complex analog signals before the quadrature modulator.
  • the order is synthesizer ⁇ quadrature modulator ⁇ RF amplifier.
  • the specific configuration of the present invention is not limited to the above-described embodiment, and changes within a range not departing from the gist of the present invention are included in the present invention.
  • This application claims the priority on the basis of Japanese application Japanese Patent Application No. 2010-017701 for which it applied on January 29, 2010, and takes in those the indications of all here.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Transmitters (AREA)

Abstract

La présente invention se rapporte à un émetteur dans un système de communication sans fil. Ledit émetteur est pourvu : d'un synthétiseur de signaux qui synthétise des signaux analogiques respectifs, obtenus en effectuant une conversion série-parallèle sur les séquences de signaux numériques d'entrée et en transmettant les signaux à une pluralité de convertisseurs numériques-analogiques, en au moins deux sorties combinées avec des lignes d'entrée ; d'une pluralité de mélangeurs de modulation en quadrature qui modulent les signaux analogiques intégrés et délivrés par le synthétiseur de signaux en signaux RF modulés en quadrature ; et d'une pluralité d'amplificateurs RF qui amplifient la pluralité de signaux RF modulés en quadrature provenant des mélangeurs de modulation en quadrature afin de les faire correspondre à des fréquences de sous-porteuse individuelle.
PCT/JP2011/052075 2010-01-29 2011-01-26 Système de communication sans fil, émetteur et procédé de communication à porteuses multiples WO2011093511A1 (fr)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3832890A1 (fr) * 2019-12-03 2021-06-09 Harris Global Communications, Inc. Système de communication doté de plusieurs supports ventilés et procédés associés

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004221653A (ja) * 2003-01-09 2004-08-05 Hitachi Kokusai Electric Inc 送信機
JP2005123788A (ja) * 2003-10-15 2005-05-12 Sharp Corp 無線通信装置
JP2006237925A (ja) * 2005-02-24 2006-09-07 Hitachi Kokusai Electric Inc 無線送信増幅装置
WO2009001465A1 (fr) * 2007-06-28 2008-12-31 Panasonic Corporation Emetteur, procédé d'émission, récepteur et procédé de réception

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2962299B2 (ja) * 1998-01-09 1999-10-12 日本電信電話株式会社 マルチキャリア信号伝送装置
JP2003101451A (ja) * 2001-09-20 2003-04-04 Japan Radio Co Ltd 無線伝送システムにおける無線中継方法及び無線中継機
JP2009171071A (ja) * 2008-01-11 2009-07-30 Sony Corp 送信装置、通信システム及び送信方法
US8483134B2 (en) * 2008-06-17 2013-07-09 Panasonic Corporation Radio transmission appratus and radio transmission method that switch between communication methods

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004221653A (ja) * 2003-01-09 2004-08-05 Hitachi Kokusai Electric Inc 送信機
JP2005123788A (ja) * 2003-10-15 2005-05-12 Sharp Corp 無線通信装置
JP2006237925A (ja) * 2005-02-24 2006-09-07 Hitachi Kokusai Electric Inc 無線送信増幅装置
WO2009001465A1 (fr) * 2007-06-28 2008-12-31 Panasonic Corporation Emetteur, procédé d'émission, récepteur et procédé de réception

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
DAVID A. WIEGANDT ET AL.: "High-throughput, high-performance OFDM via pseudo-orthogonal carrier interferometry spreading codes", COMMUNICATIONS, IEEE TRANSACTIONS ON, July 2003 (2003-07-01) *
SUGURU KAMEDA ET AL.: "High-Speed Wireless System Using Multi-Carrier MSK Modulation Bandwidth Reduction Method with Orthogonal- Frequency Allocation", IEICE TECHNICAL REPORT, RCS, RADIO COMMUNICATION SYSTEMS, vol. 109, no. 164, 27 July 2009 (2009-07-27), pages 1 - 6 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3832890A1 (fr) * 2019-12-03 2021-06-09 Harris Global Communications, Inc. Système de communication doté de plusieurs supports ventilés et procédés associés
US11050594B2 (en) 2019-12-03 2021-06-29 Harris Global Communications, Inc. Communications system having multiple spread carriers and associated methods

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