WO2007148584A1 - 可変帯域で通信するための装置及び方法 - Google Patents
可変帯域で通信するための装置及び方法 Download PDFInfo
- Publication number
- WO2007148584A1 WO2007148584A1 PCT/JP2007/061932 JP2007061932W WO2007148584A1 WO 2007148584 A1 WO2007148584 A1 WO 2007148584A1 JP 2007061932 W JP2007061932 W JP 2007061932W WO 2007148584 A1 WO2007148584 A1 WO 2007148584A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- data
- subcarriers
- transmission
- communication
- subcarrier
- Prior art date
Links
Classifications
-
- 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
-
- 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
- H04L5/0037—Inter-user or inter-terminal allocation
-
- 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
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2649—Demodulators
- H04L27/2653—Demodulators with direct demodulation of individual subcarriers
-
- 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
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
-
- 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
- H04L5/0037—Inter-user or inter-terminal allocation
- H04L5/0039—Frequency-contiguous, i.e. with no allocation of frequencies for one user or terminal between the frequencies allocated to another
-
- 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
- H04L27/2602—Signal structure
Definitions
- the present invention relates generally to the technical field of mobile communications, and more particularly to an apparatus and method for communicating in a variable band.
- the Orthogonal Frequency Division Multiplexing (OFDM) method is a communication method having various advantages such as high resistance to multipath transmission lines and high frequency utilization efficiency.
- OFDM Orthogonal Frequency Division Multiplexing
- data is mapped to a number of subcarriers arranged so as to be orthogonal to each other, and a time series signal is derived by performing inverse Fourier transform on the data group, and a transmission symbol for radio transmission is created.
- the On the receiving side the transmitted data group is derived by Fourier transforming such symbols, and the transmitted data is reproduced by restoring individual data associated with each subcarrier.
- FIG. 1 shows signals communicated by the OFDM method.
- the system frequency band includes many subcarriers. Data to be transmitted is mapped to each subcarrier.
- the subcarrier corresponding to the center frequency f is used for data mapping.
- This center frequency corresponds to the carrier frequency, so that even when trying to map the data, a strong interference component is generated there and the data cannot be transmitted / received with high quality.
- This center frequency is sometimes referred to as “DC subcarrier”, “DC offset” or the like.
- UE user equipment
- 20 MHz is prepared for the entire system bandwidth, and the user apparatus can perform communication using a 10 MHz or 20 MHz band. More bandwidth may be provided. For example, a band such as 1.25 MHz or 2.5 MHz may be further prepared. By making it possible to select an appropriate band according to the communication environment and application, from a wide and narrow range. It can be expected to further improve the efficiency of line resources.
- a communication system that performs communication in a variable band is described in Non-Patent Document 1, for example. It should be noted that even if “communication is performed in a variable band”, not all frequencies in that band are always available in the user equipment.
- One or more of the many resource blocks included in the bandwidth (one of the variable bandwidths) allocated to the user equipment is used for actual communication. Which one or more resource blocks are assigned to the user apparatus or none is scheduled at the base station according to the channel state at the time.
- Non-Patent Document 1 3GPP TR25.814 VI.5.0 (May 26, 2006)
- the inventors of the present invention have come up with the idea of realizing variable-band communication using the OFDM method in the basic research of the present invention. If this can be realized, excellent advantages such as high multi-nos interference immunity and frequency utilization efficiency can be obtained even when communicating in various bands, and further improvement in transmission efficiency is expected. I can't do it. Even in this case, it is necessary to consider that the center frequency of the band used for communication is not used for data transmission.
- FIG. 3 shows a state in which communication is performed in a variable band as in FIG. In Fig. 3, this is clearly shown by the relationship between the subcarrier and the center frequency.
- user A and user C communicate in the 10 MHz and 20 MHz bands, respectively.
- the position of the force center frequency using 10 MHz is different.
- the center frequency (DC subcarrier) of the 10 MHz band used by user B is “f”.
- the frequency f or f depends on the bandwidth of the user equipment, and the data is You may or may not be able to rob. Performing frequency scheduling while determining whether or not each subcarrier can be used for data mapping is not advantageous from the standpoint of incurring the complexity of base station control.
- An object of the present invention is to transmit signals easily and with high quality in various bands in an OFDM communication system.
- a transmitting apparatus and a receiving apparatus for performing OFDM communication with a bandwidth selected from a plurality of bandwidths prepared in the system are used.
- the transmission apparatus includes mapping means for converting data to be transmitted into data groups associated with individual subcarriers, inverse Fourier transform means for converting the data groups into time series signals, and wireless transmission from the time series signals. Means for generating a transmission symbol of trust.
- the mapping means associates the data to be transmitted with a subcarrier different from a plurality of predetermined subcarriers located at equal intervals on the frequency axis.
- the receiving device includes a field conversion unit that converts a radio-received time-series signal into a frequency domain data group, and a demapping unit that associates the data in the data group with each subcarrier as restoration data. And means for restoring transmission data from the restoration data.
- the demapping means outputs data associated with subcarriers different from a predetermined plurality of subcarriers positioned at equal intervals on the frequency axis as restoration data.
- signals can be transmitted easily and with high quality in various bands in an OFDM communication system.
- FIG. 1 is a diagram showing signals communicated by OFDM.
- FIG. 2 is a diagram showing a state where communication is performed in a variable band.
- FIG. 3 is a diagram showing a state where communication is performed in a variable band.
- FIG. 4 is a functional block diagram of a transmission device used in an embodiment of the present invention.
- FIG. 5 is a functional block diagram of a receiving apparatus used in an embodiment of the present invention.
- FIG. 6 is a diagram for explaining the operation in one embodiment of the present invention.
- transmission data is associated with and transmitted with a subcarrier different from a plurality of predetermined subcarriers (null subcarriers) positioned at equal intervals on the wavenumber axis.
- the data is processed as data for 1S restoration associated with subcarriers other than the null subcarrier.
- Null subcarriers are not used for communication with any user equipment. Therefore, it is not necessary to determine whether or not each subcarrier can be used for data mapping each time, while simplifying the control of the base station and avoiding the DC subcarriers of all user equipments, high data transmission quality ⁇ ⁇ can be planned.
- the user apparatus can perform communication in a band having any one of a plurality of predetermined subcarriers as a center frequency. It is desirable to be done. Specifically, a predetermined plurality of subcarriers are prepared in an odd number system of 3 or more.
- Mapping may be performed according to bandwidth information indicating a correspondence relationship between each of the variable bandwidths provided in the system and null subcarriers.
- the bandwidth information may be information stored in advance in the storage device.
- FIG. 4 shows a functional block diagram of a transmission apparatus used in an embodiment of the present invention.
- the transmission apparatus may be provided in the base station or in the user apparatus.
- both the base station and the user device are provided with a transmission device as shown in FIG.
- a serial / parallel conversion unit (S / P) 42, a mapping unit 44, a fast inverse Fourier transform unit (IFFT) 46, a guard interval addition unit (+ GI) 48, and a radio unit (RF) 50 are depicted. .
- the serial / parallel converter (S / P) 42 is a serial / parallel converter that converts a series of transmission data (sequences) into a plurality of parallel data sequences.
- the transmission data channel code is already processed, such as data modulation.
- Mapping section 44 associates the parallel data group after serial-parallel conversion with each subcarrier according to the bandwidth information. For example, a plurality of predetermined subcarriers are uniquely associated with individual bandwidths such as 20 MHz, 10 MHz, and 5 MHz. This predetermined number of subcarriers is referred to herein as a “null sub-carrier” and no data is mapped to it.
- the bandwidth information indicates what power is used for the communication of the local station and what is the null subcarrier in the bandwidth.
- the mapping unit 44 outputs a parallel data group in association with subcarriers other than the null subcarrier. Note that the actual mapping needs to follow information indicating which data is to be multiplexed in which resource block, etc., but description of such multiplexing and scheduling is omitted for the sake of simplicity of explanation. Is done.
- a fast inverse Fourier transform unit (IFFT) 46 performs fast Fourier transform on a data group associated with each subcarrier, and performs OFDM modulation.
- a guard interval adding unit (+ GI) 48 adds a guard interval to the time-series signal after modulation.
- the radio unit (RF) 50 converts a signal with a guard interval into a transmission symbol for radio transmission of antenna power.
- the radio unit 50 performs processing such as band limitation and frequency conversion.
- the carrier wave is appropriately adjusted to the center frequency of the band used by the transmission apparatus. Specifically, if the transmission apparatus is provided in the base station or the user apparatus that uses the entire system band, the carrier wave is set to the center frequency f of the system band.
- the transmission device is If it is provided in the user equipment that uses a part of the system band, the carrier wave is set to any null subcarrier (f, f or f).
- FIG. 5 shows a functional block diagram of a receiving apparatus used in an embodiment of the present invention.
- a radio unit (RF) 52 a radio unit (RF) 52, a guard interval removal unit 54 (—GI), a fast Fourier transform unit (FFT) 56, a demapping unit 58, and a parallel serial conversion unit (P / S) 60 are depicted.
- RF radio unit
- GI guard interval removal unit
- FFT fast Fourier transform unit
- demapping unit 58 demapping unit
- P / S parallel serial conversion unit
- the radio unit (RF) 52 converts the received symbol into a signal for processing in the baseband.
- the wireless unit 52 performs processing such as band limitation and frequency conversion.
- the carrier wave is appropriately adjusted to the center frequency of the band used by the receiving device.
- the guard inverter removing unit 54 (—GI) removes a portion corresponding to the guard inverter from the received signal power.
- a fast Fourier transform unit (FFT) 56 performs fast Fourier transform on the symbol (effective symbol) from which the guard interval has been removed, and performs demodulation in the OFDM scheme. As a result, a data group mapped to each subcarrier is derived.
- FFT fast Fourier transform unit
- Demapping section 58 extracts and outputs data mapped to subcarriers other than the null subcarrier from the derived data group.
- the location of the null subcarrier can be determined based on the bandwidth information.
- the parallel-serial conversion unit (P / S) 60 is a parallel-serial conversion unit that converts a data group (parallel data group) mapped to subcarriers other than the null subcarrier into a series of data series. The converted data is left to further processing to restore the transmitted data.
- the transmission data is input to the S / P unit 42 in FIG. 4, converted into a plurality of parallel data sequences, and input to the mapping unit 44.
- the mapping unit 44 outputs the parallel data group in association with subcarriers other than the null subcarrier. No data is mapped to the null subcarrier.
- null subcarriers As shown in FIG. 6, an odd number of null subcarriers (three in the illustrated example) are set in one system bandwidth. Null subcarriers are arranged at regular intervals on the frequency axis in the system band. In the example shown in the figure, null subcarriers are set every six subcarriers. Strange Among several null subcarriers, the center null subcarrier power corresponds to the carrier wave during wireless communication of the user equipment. Therefore, the center null subcarrier f is the band of the conventional OFDM scheme.
- Information indicating a certain band and the null subcarrier set in that band is typically fixedly prepared in a storage device of the apparatus, and is extracted as necessary as bandwidth information.
- the number of null subcarriers to be set and the interval between null subcarriers are determined according to the type of variable band prepared in the system.
- the null subcarrier interval is equal to 1Z2 of the band in which any user apparatus can communicate (the minimum guaranteed bandwidth for the user apparatus, which is 10 MHz in the illustrated example).
- the mapping unit 44 in FIG. 4 maps the data to such subcarriers other than the null subcarrier and outputs the data to the IFFT unit 46.
- “0” is indicated at the position corresponding to the null subcarrier.
- the three “0” s correspond to f 1, f 2 and f 3 in FIG. Null sub
- Data groups mapped to subcarriers other than the carrier are subjected to fast Fourier transform, a guard interval is added to the converted signal, and finally transmission symbols are transmitted wirelessly from the antenna.
- the receiving apparatus that has received the transmission symbol removes the guard interval and performs Fourier transform.
- subcarriers other than the null subcarrier are extracted by the demapping unit 58 in FIG. 5, and the data group mapped to each subcarrier is extracted. Similar to the transmitting side, information indicating the relationship between the used band and the null subcarrier can also be obtained as bandwidth information.
- These data groups are converted into a series of signal sequences by the S / P unit 60, and then the transmission data is restored.
- the null subcarrier set in the system is not used for communication with any user apparatus. Therefore, it is not necessary to determine whether each subcarrier can be used for data mapping. In this way, the control of the base station is simplified, and the DC subcarrier is avoided to improve the quality of data transmission. be able to.
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- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Mobile Radio Communication Systems (AREA)
- Transmitters (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP07745199.5A EP2037609A4 (en) | 2006-06-19 | 2007-06-13 | DEVICE AND METHOD FOR REALIZING COMMUNICATION IN A VARIABLE BAND |
BRPI0713284-0A BRPI0713284A2 (pt) | 2006-06-19 | 2007-06-13 | Aparelho e processo para comunicação em bandas variáveis |
US12/332,856 US8270508B2 (en) | 2006-06-19 | 2008-12-11 | Apparatus and method for communication in variable bands |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2006-169450 | 2006-06-19 | ||
JP2006169450A JP4954617B2 (ja) | 2006-06-19 | 2006-06-19 | 可変帯域で通信するための装置及び方法 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/332,856 Continuation US8270508B2 (en) | 2006-06-19 | 2008-12-11 | Apparatus and method for communication in variable bands |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2007148584A1 true WO2007148584A1 (ja) | 2007-12-27 |
Family
ID=38833326
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2007/061932 WO2007148584A1 (ja) | 2006-06-19 | 2007-06-13 | 可変帯域で通信するための装置及び方法 |
Country Status (9)
Country | Link |
---|---|
US (1) | US8270508B2 (ja) |
EP (1) | EP2037609A4 (ja) |
JP (1) | JP4954617B2 (ja) |
KR (1) | KR20090019867A (ja) |
CN (1) | CN101507158A (ja) |
BR (1) | BRPI0713284A2 (ja) |
RU (1) | RU2008151381A (ja) |
TW (1) | TW200820656A (ja) |
WO (1) | WO2007148584A1 (ja) |
Cited By (4)
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---|---|---|---|---|
JPWO2009096319A1 (ja) * | 2008-02-01 | 2011-05-26 | シャープ株式会社 | 送信機、受信機、送信方法及び受信方法 |
WO2011136207A1 (ja) * | 2010-04-30 | 2011-11-03 | 株式会社 エヌ・ティ・ティ・ドコモ | 基地局、移動局、制御信号送信方法及び制御信号受信方法 |
WO2013058067A1 (ja) * | 2011-10-20 | 2013-04-25 | 株式会社メガチップス | 通信装置および通信システム |
WO2016149381A1 (en) * | 2015-03-16 | 2016-09-22 | Texas Instruments Incorporated | Optimized phy frame structure for ofdm based narrowband plc |
Families Citing this family (8)
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JP5168015B2 (ja) * | 2008-07-31 | 2013-03-21 | 富士通モバイルコミュニケーションズ株式会社 | 無線基地局装置および移動無線端末装置 |
GB2506418A (en) * | 2012-09-28 | 2014-04-02 | Sony Corp | A base station allocates a centre frequency for an OFDM virtual channel in dependence upon a terminal's bandwidth capability |
CN105577337A (zh) * | 2014-10-17 | 2016-05-11 | 中兴通讯股份有限公司 | 一种下行信号的发送、接收方法及装置 |
US10524255B2 (en) | 2016-05-20 | 2019-12-31 | Lg Electronics Inc. | Method and apparatus for handling DC subcarrier in NR carrier in wireless communication system |
WO2018021676A1 (en) * | 2016-07-27 | 2018-02-01 | Lg Electronics Inc. | Method and apparatus for handling dc subcarrier in nr carrier in wireless communication system |
KR101978247B1 (ko) | 2017-11-27 | 2019-05-14 | 현대오트론 주식회사 | 풀 스로틀 시 변속시점 제어방법 및 이를 통해 제어되는 변속기 |
KR102528624B1 (ko) | 2019-04-12 | 2023-05-04 | 삼성전자 주식회사 | 무선 통신 시스템에서 로컬 주파수를 결정하는 방법 및 장치 |
US11799620B2 (en) | 2020-04-27 | 2023-10-24 | Qualcomm Incorporated | Boosted noncoherent modulation |
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2007
- 2007-06-13 KR KR1020087031831A patent/KR20090019867A/ko active IP Right Grant
- 2007-06-13 RU RU2008151381/09A patent/RU2008151381A/ru not_active Application Discontinuation
- 2007-06-13 BR BRPI0713284-0A patent/BRPI0713284A2/pt not_active IP Right Cessation
- 2007-06-13 CN CNA2007800303375A patent/CN101507158A/zh active Pending
- 2007-06-13 EP EP07745199.5A patent/EP2037609A4/en not_active Withdrawn
- 2007-06-13 WO PCT/JP2007/061932 patent/WO2007148584A1/ja active Application Filing
- 2007-06-15 TW TW096121767A patent/TW200820656A/zh unknown
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2008
- 2008-12-11 US US12/332,856 patent/US8270508B2/en not_active Expired - Fee Related
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Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPWO2009096319A1 (ja) * | 2008-02-01 | 2011-05-26 | シャープ株式会社 | 送信機、受信機、送信方法及び受信方法 |
WO2011136207A1 (ja) * | 2010-04-30 | 2011-11-03 | 株式会社 エヌ・ティ・ティ・ドコモ | 基地局、移動局、制御信号送信方法及び制御信号受信方法 |
JP2011238989A (ja) * | 2010-04-30 | 2011-11-24 | Ntt Docomo Inc | 基地局、移動局、制御信号送信方法及び制御信号受信方法 |
WO2013058067A1 (ja) * | 2011-10-20 | 2013-04-25 | 株式会社メガチップス | 通信装置および通信システム |
WO2016149381A1 (en) * | 2015-03-16 | 2016-09-22 | Texas Instruments Incorporated | Optimized phy frame structure for ofdm based narrowband plc |
US9692484B2 (en) | 2015-03-16 | 2017-06-27 | Texas Instruments Incorporated | Optimized PHY frame structure for OFDM based narrowband PLC |
US10425127B2 (en) | 2015-03-16 | 2019-09-24 | Texas Instruments Incorporated | Optimized PHY frame structure for OFDM based narrowband PLC |
US10879958B2 (en) | 2015-03-16 | 2020-12-29 | Texas Instruments Incorporated | Optimized PHY frame structure for OFDM based narrowband PLC |
US11431381B2 (en) | 2015-03-16 | 2022-08-30 | Texas Instruments Incorporated | Optimized PHY frame structure for OFDM based narrowband PLC |
Also Published As
Publication number | Publication date |
---|---|
US20090154584A1 (en) | 2009-06-18 |
RU2008151381A (ru) | 2010-07-27 |
KR20090019867A (ko) | 2009-02-25 |
EP2037609A4 (en) | 2014-03-19 |
JP4954617B2 (ja) | 2012-06-20 |
TW200820656A (en) | 2008-05-01 |
EP2037609A1 (en) | 2009-03-18 |
JP2007336497A (ja) | 2007-12-27 |
US8270508B2 (en) | 2012-09-18 |
BRPI0713284A2 (pt) | 2012-03-06 |
CN101507158A (zh) | 2009-08-12 |
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