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WO2011093514A1 - 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
WO2011093514A1
WO2011093514A1 PCT/JP2011/052080 JP2011052080W WO2011093514A1 WO 2011093514 A1 WO2011093514 A1 WO 2011093514A1 JP 2011052080 W JP2011052080 W JP 2011052080W WO 2011093514 A1 WO2011093514 A1 WO 2011093514A1
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WIPO (PCT)
Prior art keywords
digital signal
transmitter
signals
complex
communication system
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Ceased
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PCT/JP2011/052080
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English (en)
Japanese (ja)
Inventor
直 高木
卓 亀田
和夫 坪内
健一 細谷
建一 丸橋
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tohoku University NUC
NEC Corp
Original Assignee
Tohoku University NUC
NEC Corp
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.)
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Publication date
Application filed by Tohoku University NUC, NEC Corp filed Critical Tohoku University NUC
Priority to JP2011551968A priority Critical patent/JP5871210B2/ja
Publication of WO2011093514A1 publication Critical patent/WO2011093514A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2614—Peak power aspects
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0044—Allocation of payload; Allocation of data channels, e.g. PDSCH or PUSCH

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 a transmitter used in the OFDM wireless communication system is also described in Patent Document 1.
  • the signal is divided into an in-phase component and a quadrature component, and then combined with an OFDM signal by a quadrature modulator and input to a transmission amplifier (RF amplifier). is doing.
  • RF amplifier transmission amplifier
  • 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.
  • the present invention does not require a large back-off in an RF amplifier used in a transmitter, and as a result, an RF amplifier having a low saturation output power is used. And a radio communication system capable of using the RF amplifier with high power efficiency, and as a result, significantly reducing the power consumption of the transmitter and reducing the power consumption per bit.
  • an input digital signal sequence is serial-parallel converted and input to a plurality of DA converters.
  • Multi-carrier communication comprising a plurality of quadrature modulation mixers that modulate signals, and a plurality of RF amplifiers that individually amplify a plurality of RF signals that have been quadrature-modulated by the plurality of quadrature modulation mixers in correspondence with subcarrier frequencies Have a transmitter to do.
  • 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 ⁇ ) to a complex analog signal (V BB.0 (t) to V BB.N-1 (t)), and a plurality of DA converters 5 and each complex analog signal (V BB.0 ( t) ⁇ V BB.N-1 (T)), a plurality of quadrature modulation mixers 6 for generating RF signals (V RF.0 (t) to V RF.N-1 (t)) in which the real part is quadrature modulated, and the quadrature modulation mixers.
  • a plurality of RF amplifiers 8 for amplifying the orthogonally modulated RF signals (V RF.0 (t) to V RF.N-1 (t)), respectively.
  • a plurality of antennas 9 for sending the amplified RF signals into the air.
  • the digital signal processing circuit 4 operates as signal processing means.
  • the DA converter 5 operates as DA conversion means.
  • 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)).
  • Each complex analog signal (V BB.0 (t) to V BB.N ⁇ 1 (t)) is further subjected to quadrature modulation by an orthogonal modulation mixer 6 and a local oscillator 7 (V RF.0 (t ) To V RF.N-1 (t)).
  • the quadrature-modulated RF signals (V RF.0 (t) to V RF.N-1 (t)) are respectively amplified by the RF amplifier 8 and transmitted from the antenna 9 to the air.
  • each of the quadrature-modulated RF signals (V RF.0 (t) to V RF.N ⁇ 1 (t)) amplified by each RF amplifier 8 becomes a single carrier modulation signal.
  • single carrier modulation for example, BPSK, QPSK, 8PSK, 16QAM, and 64QAM are applicable. This eliminates the need to amplify a multicarrier signal that has become a problem in a wireless communication system that uses existing multicarriers such as OFDM, and reduces the problem of increased PAPR in the amplifier. As a result, an RF amplifier with a large saturation output is not necessary, and the problem of a decrease in efficiency of the RF amplifier due to an increase in PAPR can be avoided.
  • the fundamental frequency f 0 1 / T
  • the frequency f k kf 0 (k is an integer) that is an integer multiple of.
  • 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.N-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 RF signals combined corresponding to each power combiner 11 are combined. The difference is that a plurality of antennas 12 to be sent out into the air are provided. 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 shows an example in which a plurality of power combiners are used, but all the RF signals individually amplified by each RF amplifier 8 are combined by one power combiner. One antenna may be sent into the air.
  • 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. 4 is different in that a guard interval circuit 13 is loaded between the digital signal processing circuit 4 and the plurality of DA converters 5. Next, the operation will be described.
  • 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. 4, when the guard interval circuit (GI) 13 is added, as shown in FIG. 6, discontinuity occurs between successive signals (point A in the figure).
  • 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) to V BB.N-1 (t)), and each of the complex analog signals (V BB.0 (t) to V BB.N-1 (t))
  • a plurality of quadrature modulation mixers 6 that generate quadrature-modulated RF signals (V RF.0 (t) to V RF.N-1 (t)), and a plurality of local oscillation signals that are supplied to each quadrature modulation mixer Local oscillator 7, a plurality of RF amplifiers 8 for amplifying each quadrature-modulated RF signal (V RF.0 (t) to V RF.N ⁇ 1 (t)),
  • 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 complex analog signal (V BB.0 (t) to V BB.N-1 (t)) is further subjected to quadrature modulation by the quadrature modulation mixer 6 and the local oscillator 7 (V RF.0 (t)). ⁇ VRF.N-1 (t)).
  • the quadrature modulated RF signals (V RF.0 (t) to V RF.N-1 (t)) are further amplified by the RF amplifier 8 and transmitted from the antenna 9 to the air.
  • the quadrature modulated RF signals (V RF.0 (t) to V RF.N ⁇ 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 applies phase rotation so that each complex symbol is developed in a separate frequency domain and can be individually demodulated, and as a result, N 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.
  • a separate frequency is assigned to each of N complex symbols, further orthogonally modulated, and each orthogonally modulated RF signal is individually amplified. It is configured.
  • 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 can be configured, and the presence / absence of the circuit and the order can be changed. On the other hand, it is desirable that the RF amplifier is provided at a stage subsequent to the quadrature modulator.
  • 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. 2010-017636 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'une pluralité de mélangeurs de modulation en quadrature qui modulent les 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 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/JP2011/052080 2010-01-29 2011-01-26 Système de communication sans fil, émetteur et procédé de communication à porteuses multiples Ceased WO2011093514A1 (fr)

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JP2011551968A JP5871210B2 (ja) 2010-01-29 2011-01-26 無線通信システム、送信機およびマルチキャリア通信方法

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JP2010017636 2010-01-29
JP2010-017636 2010-01-29

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JP2018074540A (ja) * 2016-11-04 2018-05-10 株式会社国際電気通信基礎技術研究所 無線通信装置および無線通信方法
JP2018078447A (ja) * 2016-11-09 2018-05-17 株式会社国際電気通信基礎技術研究所 無線通信装置および無線通信方法

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JP2018074540A (ja) * 2016-11-04 2018-05-10 株式会社国際電気通信基礎技術研究所 無線通信装置および無線通信方法
JP2018078447A (ja) * 2016-11-09 2018-05-17 株式会社国際電気通信基礎技術研究所 無線通信装置および無線通信方法

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