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WO2009119685A1 - Dispositif d'émission ofdm et procédé d'émission ofdm - Google Patents

Dispositif d'émission ofdm et procédé d'émission ofdm Download PDF

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Publication number
WO2009119685A1
WO2009119685A1 PCT/JP2009/055997 JP2009055997W WO2009119685A1 WO 2009119685 A1 WO2009119685 A1 WO 2009119685A1 JP 2009055997 W JP2009055997 W JP 2009055997W WO 2009119685 A1 WO2009119685 A1 WO 2009119685A1
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WIPO (PCT)
Prior art keywords
subcarrier
subcarriers
ofdm signal
amplitude
modulation
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/JP2009/055997
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English (en)
Japanese (ja)
Inventor
輝人 武田
充 田邊
幸夫 岡田
友昭 水田
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Panasonic Electric Works Co Ltd
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Panasonic Electric Works Co Ltd
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 Panasonic Electric Works Co Ltd filed Critical Panasonic Electric Works Co Ltd
Priority to CN2009801107516A priority Critical patent/CN101981843A/zh
Priority to KR1020107023982A priority patent/KR101317746B1/ko
Publication of WO2009119685A1 publication Critical patent/WO2009119685A1/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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/04—Transmission power control [TPC]
    • H04W52/30—Transmission power control [TPC] using constraints in the total amount of available transmission power
    • H04W52/34—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading
    • H04W52/346—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading distributing total power among users or channels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control

Definitions

  • the present invention relates to an OFDM transmission apparatus and an OFDM transmission method.
  • an OFDM (Orthogonal Frequency Division Multiplexing) transmitting apparatus transmits digital data by a multi-carrier signal (OFDM signal) using a plurality of subcarriers having an orthogonal relationship with each other.
  • the OFDM transmitter multiplexes a plurality of subcarriers modulated by digital data to generate a digital multicarrier signal.
  • the digital multicarrier signal is converted into an analog multicarrier signal by a D / A converter and output to a transmission path.
  • the maximum amplitude of the OFDM signal is matched with the maximum amplitude that can be input to the D / A converter, and the D / A converter is used to the maximum extent. Not considered.
  • the present invention has been made in view of the above-mentioned reasons, and an object of the present invention is to provide an OFDM transmission apparatus and an OFDM transmission method capable of transmitting digital data by making the best use of the capability of the D / A converter. .
  • the OFDM transmission apparatus includes a subcarrier selection unit, a modulation unit, an OFDM signal generation unit, a D / A converter, and an amplitude control unit.
  • the subcarrier selection unit selects a plurality of subcarriers to be used for digital data transmission from a group of subcarriers that are orthogonal to each other.
  • the modulation unit divides the digital data according to the number of subcarriers selected by the subcarrier selection unit.
  • the modulation unit modulates the plurality of subcarriers based on the divided digital data to generate a plurality of modulation subcarriers.
  • the OFDM signal generation unit multiplexes the plurality of modulation subcarriers to generate a digital OFDM signal.
  • the D / A converter converts the digital OFDM signal into an analog OFDM signal and outputs the analog OFDM signal to a transmission line.
  • the amplitude control unit adjusts the amplitude of the modulation subcarrier according to the number of subcarriers selected by the subcarrier selection unit so that the power of the analog OFDM signal becomes a predetermined value.
  • the digital data can be transmitted by making the best use of the capability of the D / A converter.
  • a power detection unit that detects power of the analog OFDM signal.
  • the amplitude control unit adjusts the amplitude of the modulation subcarrier according to the number of subcarriers selected by the subcarrier selection unit so that the power detected by the power detection unit becomes the predetermined value. .
  • the power of the analog OFDM signal can be accurately set to the predetermined value.
  • a transmission path state acquisition unit that acquires the transmission path state of each subcarrier.
  • the amplitude control unit determines whether the subcarrier transmission path state is good or bad based on the transmission path state of the subcarrier acquired by the transmission path state acquisition unit. Further, the amplitude control unit decreases the amplitude of the modulation subcarrier corresponding to the subcarrier having a good transmission path state, and increases the amplitude of the modulation subcarrier corresponding to the subcarrier having a poor transmission path state.
  • the predetermined value is the power of the analog OFDM signal when the amplitude of the digital OFDM signal is a maximum value that can be input to the D / A converter.
  • a transmission path state acquisition unit that acquires the transmission path state of each subcarrier.
  • the subcarrier selection unit selects the plurality of subcarriers to be used for transmission of the digital data from the subcarrier group based on the transmission path state of the subcarrier acquired by the transmission path state estimation unit.
  • the OFDM transmission method has five steps.
  • a plurality of subcarriers to be used for digital data transmission are selected from subcarrier groups having an orthogonal relationship with each other.
  • the digital data is divided according to the number of the subcarriers selected in the first step, the plurality of subcarriers are modulated based on the divided digital data, and a plurality of subcarriers are modulated. Generate modulated subcarriers.
  • the plurality of modulation subcarriers are multiplexed to generate a digital OFDM signal.
  • the digital OFDM signal is converted into an analog OFDM signal by a D / A converter and output to the transmission path.
  • the fifth step is executed between the second step and the third step.
  • the amplitude of the modulation subcarrier is adjusted according to the number of subcarriers selected in the first step so that the power of the analog OFDM signal becomes a predetermined value.
  • the digital data can be transmitted by making the best use of the capability of the D / A converter.
  • An OFDM transmission apparatus (hereinafter referred to as “transmission apparatus”) 10 receives digital data by a multicarrier signal (OFDM signal) using a plurality of subcarriers having different frequencies and orthogonal relationships.
  • the data is transmitted to an OFDM receiver (not shown) (hereinafter referred to as “receiver”).
  • An OFDM communication apparatus including a transmission apparatus 10 and a reception apparatus is used for performing packet communication using an OFDM-modulated signal (OFDM signal).
  • the transmission path between the transmission device 10 and the OFDM reception device may be wired or wireless.
  • the transmission apparatus 10 includes an error correction coding unit 20, a modulation unit 30, an interleaver 40, a signal generation unit 50, a D / A converter 60, an amplitude control unit 70, a transmission path state acquisition unit (hereinafter referred to as “transmission path state acquisition unit”). 80 and “subcarrier selection unit” (hereinafter referred to as “selection unit”) 90.
  • the acquisition unit 80 acquires the transmission path state of the subcarrier. For example, the acquisition unit 80 receives the transmission path state (reception state) of each subcarrier of the OFDM signal from the receiving device.
  • the transmission path state is, for example, an S / N ratio. Further, the transmission path state may be BER (Bit Error Rate).
  • the selection unit 90 selects a plurality of subcarriers to be used for digital data transmission from subcarrier groups that are orthogonal to each other.
  • the selection unit 90 estimates that the subcarrier transmission path state is bad if the S / N ratio of the subcarrier is equal to or less than the first threshold. In addition, if the S / N ratio of the subcarrier exceeds the first threshold, the selection unit 90 estimates that the transmission path state of the subcarrier is good. As a result of the estimation of the transmission path state, the selection unit 90 does not select a subcarrier with a poor transmission path state, but selects a subcarrier with a good transmission path state.
  • the selection result of the subcarrier in the selection unit 90 is notified to the modulation unit 30.
  • the selection unit 90 selects all the subcarriers. Note that the selection unit 90 may estimate the transmission path state of the subcarrier at regular intervals. Further, when the transmission path state does not substantially change, the selection unit 90 may use the result estimated when the transmission apparatus 10 is installed thereafter.
  • the error correction code unit 20 adds an error correction code to the digital data (serial bit string) to be transmitted to the receiving device and outputs the digital data to the modulation unit 30. By adding an error correction code, it is possible to improve the reliability of the communication system even when the transmission path is under adverse conditions.
  • the modulation unit 30 includes a serial / parallel converter 31, a symbol mapper 32, and a plurality of subcarrier modulators 33.
  • the serial-parallel converter 31 divides the digital data to which the error correction code is added according to the number of subcarriers selected by the selection unit 90 (hereinafter referred to as “selection number”) to generate parallel data.
  • the number of parallel data is equal to the selected number. Further, the division of digital data is performed in symbol units.
  • the number of bits represented by one symbol is determined by the modulation scheme. For example, in the case of QPSK (Quadrature Phase Shift Keying), one symbol corresponds to 2 bits.
  • the serial / parallel converter 31 outputs parallel data to the symbol mapper 32.
  • the symbol mapper 32 converts each parallel data generated by the serial / parallel converter 31 into a complex symbol sequence (IQ signal) for modulating subcarriers.
  • the complex symbols constituting the complex symbol sequence are expressed in the form of a + jb (j is an imaginary unit) using the coefficient a of the in-phase component of the subcarrier and the coefficient b of the orthogonal component of the subcarrier.
  • QPSK uses four sine waves (symbols) whose phases are different by 90 degrees. Each symbol is defined by a complex symbol. There is a one-to-one correspondence between complex symbols and symbols. Table 1 shows the correspondence between bit strings and complex symbols in QPSK.
  • the symbol mapper 32 typically converts the divided data into a complex symbol sequence with reference to a data table indicating the correspondence between the bit sequence and the complex symbol.
  • the symbol mapper 32 outputs each complex symbol sequence to the subcarrier modulator 33 corresponding to the subcarrier selected by the selection unit 90.
  • the subcarrier modulator 33 has a one-to-one correspondence with the subcarriers included in the subcarrier group.
  • the subcarrier modulator 33 modulates the subcarrier with the complex symbol sequence received from the symbol mapper to generate a modulated subcarrier.
  • the subcarrier modulator 33 outputs the modulated subcarrier to the interleaver 40.
  • the modulation unit 30 divides the digital data according to the selection number. Further, the modulation unit 30 modulates a plurality of subcarriers (subcarriers selected by the selection unit 90) based on the divided digital data to generate a plurality of modulation subcarriers.
  • Interleaver 40 changes the order of the modulated subcarriers (symbol order) generated by subcarrier modulator 33 and outputs the result to signal generation unit 50. By using the interleaver 40, the influence of burst errors can be reduced.
  • the signal generation unit 50 includes an inverse discrete Fourier transformer 51, a parallel-serial converter 52, a guard interval addition unit 53, a real part extraction unit 54, a frequency converter 55, a local oscillator 56, and a bandpass filter 57. And have.
  • the inverse discrete Fourier transformer 51 performs inverse discrete Fourier transform on a plurality of modulation subcarriers obtained from the interleaver 40 for each symbol, and generates a sample value of the symbol.
  • the inverse discrete Fourier transformer 51 outputs the symbol sample value to the parallel-serial converter 52.
  • the parallel-serial converter 52 arranges the symbol sample values obtained from the inverse discrete Fourier transformer 51 in series to generate serial data (hereinafter referred to as “complex baseband OFDM signal”).
  • the guard interval adding unit 53 adds a guard interval to the complex baseband OFDM signal. By adding a guard interval, it is possible to prevent intersymbol interference due to multipath delay waves.
  • the real part extractor 54 extracts the real part from the complex baseband OFDM signal.
  • the frequency converter 55 converts the frequency of the complex baseband OFDM signal to generate a carrier band OFDM signal (digital OFMD signal).
  • the frequency converter 55 performs frequency conversion by multiplying the complex baseband OFDM signal by the carrier wave [cos (2 ⁇ f C t)] of the frequency f C output from the local oscillator 56.
  • the frequency converter 55 outputs a digital OFDM signal to the D / A converter 60 through the band pass filter 57.
  • the band pass filter 57 removes an extra frequency from the digital OFDM signal.
  • the signal generation unit 50 multiplexes a plurality of modulation subcarriers to generate a digital OFDM signal.
  • the D / A converter 60 converts the digital OFDM signal into an analog OFDM signal and outputs it to the transmission line.
  • the D / A converter 60 detects the power of the analog OFDM signal.
  • the D / A converter 60 outputs the detection result of the power of the analog OFDM signal to the amplitude controller 70. That is, the D / A converter 60 functions as a power detection unit that detects the power of the analog OFDM signal.
  • the amplitude control unit 70 includes an amplitude determination unit 71 and an amplitude adjustment unit 72.
  • the amplitude determination unit 71 determines a target value of amplitude of each modulation subcarrier (hereinafter referred to as “target amplitude value”).
  • the amplitude determining unit 71 outputs the target amplitude value to the amplitude adjusting unit 72.
  • the amplitude adjustment unit 72 controls the subcarrier modulator 33 so that the amplitude of each modulation subcarrier becomes the target amplitude value received from the amplitude determination unit 71.
  • the OFDM signal is generated by superimposing all modulation subcarriers corresponding to the plurality of subcarriers selected by the selection unit 90. Therefore, the amplitude of the OFDM signal depends on the amplitude of the modulation subcarrier. The power of the modulation subcarrier depends on the amplitude of the modulation subcarrier.
  • the amplitude determination unit 71 is configured according to the number of selections so that the power of the analog OFDM signal output from the D / A converter 60 (corresponding to the total power of all modulation subcarriers) becomes the target power (predetermined value)
  • the amplitude of each modulation subcarrier is determined. For example, the amplitude determination unit 71 determines the target amplitude value of each modulation subcarrier so that the power of each modulation subcarrier matches the value obtained by dividing the target power by the selection number. Therefore, the amplitude of each modulation subcarrier decreases as the selection number increases, and increases as the selection number decreases.
  • FIG. 2A shows a state (initial state) in which all subcarriers are used.
  • the target amplitude value of each modulation subcarrier is set so that the total power of all the modulation subcarriers becomes the target power.
  • the S / N ratio of the subcarriers in the frequency band W is equal to or lower than the first threshold value.
  • the selection unit 90 does not select a subcarrier in the frequency band W. Therefore, the number of selections is reduced from the initial state. Therefore, the amplitude determination unit 71 increases the target amplitude value of each modulation subcarrier so that the total power of the modulation subcarriers becomes the target power in accordance with the decrease in the number of selections.
  • the power of each modulation subcarrier after the selection number decreases is increased by ⁇ P from the initial state as shown in FIG. Therefore, the total power of all modulation subcarriers in the initial state is equal to the total power of all modulation subcarriers when the number of selections decreases (that is, the power of the analog OFDM signal does not change regardless of the change in the number of selections). Will be constant). That is, the amplitude of the digital OFDM signal input to the D / A converter 60 is also constant regardless of the change (increase / decrease) in the number of selections.
  • the amplitude determining unit 71 corrects the target amplitude value according to the transmission path state of each subcarrier. Specifically, the amplitude determination unit 71 determines whether the state of the subcarrier transmission path selected by the selection unit 90 is good or bad based on the subcarrier transmission path state acquired by the acquisition unit 80. If the S / N ratio of the subcarrier is equal to or smaller than the second threshold, the amplitude determining unit 71 determines that the subcarrier transmission path condition is bad, and if the subcarrier transmission ratio exceeds the second threshold, the subcarrier transmission path It is determined that the state is good. The second threshold value is set to a value larger than the first threshold value. That is, the amplitude determination unit 71 determines whether the transmission path state of the subcarrier selected by the selection unit 90 is good or bad.
  • the second threshold value may be smaller than the first threshold value. If the second threshold value is smaller than the first threshold value, more subcarriers can be used than when the second threshold value is larger than the first threshold value.
  • the amplitude determination unit 71 refers to the result of the above determination, reduces the target amplitude value of the modulation subcarrier corresponding to the subcarrier having a good transmission path state, and modulates the subcarrier having a bad transmission path state. Increase the target amplitude value of the subcarrier. However, even in this case, the amplitude determination unit 71 determines each target amplitude value so that the total power of the modulation subcarriers matches the target power. In addition, what is necessary is just to set suitably how much a target amplitude value is changed according to a transmission-line state. Further, the change width of the target amplitude value may be changed according to the state of the transmission path.
  • the amplitude control unit 70 of the transmission apparatus 10 adjusts the amplitude of the modulation subcarrier according to the selection number so that the power of the analog OFDM signal becomes the target power.
  • the power of the analog OFDM signal output to the transmission path can be matched with the target power.
  • the amplitude of the analog OFDM signal is limited by the specifications of the communication system, the specifications of the D / A converter 60, legal regulations (for example, regulations regarding the power of radio signals), and the like.
  • the amplitude for each subcarrier is determined by the number of subcarriers used and the transmission path state of the subcarriers. Even in the same OFDM system, specifications such as the number of subcarriers used differ depending on the communication system. Also, there may be subcarriers that cannot be used for communication due to the effects of noise and attenuation.
  • the number of subcarriers to be used is used as a reference when determining the subcarrier amplitude in order to adapt the subcarrier amplitude to the number of subcarriers to be actually used. Therefore, according to the transmission device 10, waste of power consumption can be suppressed. Further, by reducing the number of subcarriers used, surplus power is supplied to other usable subcarriers. Therefore, according to the transmission device 10, the communication speed can be improved. Further, the transmission apparatus 10 can be commonly used for communication systems having different numbers of subcarriers to be used.
  • the predetermined value is preferably the power of the analog OFDM signal when the amplitude of the digital OFDM signal is the maximum value that can be input to the D / A converter 60.
  • the D / A converter 60 is configured such that the predetermined value is the maximum value of the power of the analog OFDM signal that is permitted by law. In this way, the communication speed can be maximized.
  • the power of the analog OFDM signal may change depending on the transmission path state of the subcarrier.
  • the amplitude control unit 70 adjusts the amplitude of the modulation subcarrier based on the power of the analog OFDM signal detected by the D / A converter 60. Therefore, the power change of the analog OFDM signal due to the transmission path state can be suppressed. Therefore, the power of the analog OFDM signal can be maintained at a predetermined value.
  • the relationship between the digital signal input to the D / A converter 60 and the analog signal output from the D / A converter 60 depends on the specifications of the D / A converter 60. It has been decided. Therefore, the amplitude of the modulated subcarrier where the power of the analog OFDM signal becomes a predetermined value can be theoretically obtained. Therefore, it is not always necessary to actually detect the power of the analog OFDM signal. However, as described above, the power of the analog OFDM signal may change depending on the transmission path state. Therefore, it is preferable to actually detect the power of the analog OFDM signal.
  • the amplitude control unit 70 decreases the amplitude of the modulation subcarrier corresponding to the subcarrier having a good transmission path condition, and increases the amplitude of the modulation subcarrier corresponding to the subcarrier having a poor transmission path condition.
  • the amplitude control unit 70 allocates a part of the power of subcarriers with good transmission path conditions to subcarriers with poor transmission path conditions. Therefore, it is possible to improve the communication status of subcarriers with poor transmission path conditions. Therefore, the communication accuracy is improved, and as a result, the communication speed is improved.
  • the amplitude control unit 70 does not necessarily need to change the amplitude of the modulation subcarrier according to the state of the transmission path. That is, the amplitude control unit 70 may be configured to make all the amplitudes of the modulation subcarriers equal.
  • the selection unit 90 selects a plurality of subcarriers to be used for digital data transmission from the subcarrier group based on the subcarrier transmission path state acquired by the acquisition unit 80. Therefore, it is possible to avoid using subcarriers that cannot transmit digital data. Therefore, the transmission apparatus 10 can prevent waste of power. Further, the communication accuracy is improved, and as a result, the communication speed is improved.
  • the selection unit 90 automatically selects a plurality of subcarriers to be used for digital data transmission from the subcarrier group based on the transmission path state of the subcarriers.
  • the selection unit 90 may be configured to select a subcarrier according to an external input.
  • a manual input method or an automatic input method can be considered.
  • a setting value determined in advance using an external device is input to the selection unit 90 using an external input device such as a button or a keyboard.
  • an external arithmetic device that determines a set value inputs the set value directly to the selection unit 90.
  • the OFDM transmission method has the following five steps, as can be seen from the operation of the transmission apparatus 10 described above.
  • a plurality of subcarriers to be used for digital data transmission are selected from subcarrier groups having an orthogonal relationship with each other.
  • the digital data is divided according to the number of subcarriers selected in the first step.
  • a plurality of modulated subcarriers are generated by modulating a plurality of subcarriers based on the divided digital data.
  • a plurality of modulation subcarriers are multiplexed to generate a digital OFDM signal.
  • the digital OFDM signal is converted into an analog OFDM signal by a D / A converter and output to the transmission path.
  • the fifth step is executed between the second step and the third step.
  • the amplitude of the modulation subcarrier is adjusted according to the number of subcarriers selected in the first step so that the power of the analog OFDM signal becomes a predetermined value.
  • the power of the analog OFDM signal output to the transmission path is controlled to a predetermined value. Therefore, according to the above-described OFDM transmission method, digital data can be transmitted by utilizing the capability of the D / A converter 60 to the maximum.

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
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Abstract

L'invention porte sur un dispositif d'émission à modulation par répartition orthogonale de la fréquence (OFDM) (10) qui inclut : une unité de sélection de sous-porteuse (90), une unité de modulation (30), une unité de génération de signal (50), un convertisseur N/A (60) et une unité de commande d'amplitude (70). L'unité de sélection de sous-porteuse (90) sélectionne une pluralité de sous-porteuses utilisées pour transmettre des données numériques parmi des sous-porteuses présentant une relation d'orthogonalité entre elles. L'unité de modulation (30) divise les données numériques conformément au nombre de sous-porteuses sélectionnées par l'unité de sélection de sous-porteuse (90). En outre, l'unité de modulation (30) module les sous-porteuses conformément aux données numériques divisées afin de générer une pluralité de sous-porteuses modulées. L'unité de génération de signal (50) multiplexe une pluralité de sous-porteuses de modulation afin de générer un signal OFDM numérique. Le convertisseur N/A (60) convertit le signal OFDM numérique en un signal OFDM analogique pour le fournir à un trajet de transmission. L'unité de commande d'amplitude (70) ajuste l'amplitude de la sous-porteuse modulée conformément au nombre des sous-porteuses sélectionnées par l'unité de sélection de sous-porteuse (90), de telle manière que la puissance du signal OFDM analogique soit une valeur prédéterminée.
PCT/JP2009/055997 2008-03-26 2009-03-25 Dispositif d'émission ofdm et procédé d'émission ofdm Ceased WO2009119685A1 (fr)

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Application Number Priority Date Filing Date Title
CN2009801107516A CN101981843A (zh) 2008-03-26 2009-03-25 Ofdm发送装置以及ofdm发送方法
KR1020107023982A KR101317746B1 (ko) 2008-03-26 2009-03-25 Ｏｆｄｍ 송신기 및 ｏｆｄｍ 송신 방법

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JP2008-082164 2008-03-26
JP2008082164A JP5108582B2 (ja) 2008-03-26 2008-03-26 Ｏｆｄｍ送信装置、およびｏｆｄｍ送信方法

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KR (2) KR101317746B1 (fr)
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JP5407562B2 (ja) 2009-06-03 2014-02-05 富士通セミコンダクター株式会社 送信装置
JP2011259031A (ja) * 2010-06-04 2011-12-22 Kyocera Corp 無線通信装置
CN114364030B (zh) * 2015-04-20 2025-05-27 韦勒斯标准与技术协会公司 使用训练信号的无线通信方法和无线通信终端
WO2018094650A1 (fr) * 2016-11-24 2018-05-31 华为技术有限公司 Procédé et appareil de modulation
EP4070580A4 (fr) 2020-07-15 2022-12-21 ZTE Corporation Codage et modulation de canal

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JPH11317723A (ja) * 1998-01-14 1999-11-16 Motorola Inc 離散マルチ・ト―ン通信システムにおいてデ―タおよびパワ―を割り当てる方法
JPH11289312A (ja) * 1998-04-01 1999-10-19 Toshiba Tec Corp マルチキャリア無線通信装置
JP2001148682A (ja) * 1999-11-22 2001-05-29 Victor Co Of Japan Ltd マルチキャリア送信装置とその受信装置、及びそのデータ送信方法
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JP2008187602A (ja) * 2007-01-31 2008-08-14 Fujitsu Ltd 通信システム及び通信方法

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