WO2007023958A1 - 無線送信装置及び無線送信方法 - Google Patents
無線送信装置及び無線送信方法 Download PDFInfo
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- WO2007023958A1 WO2007023958A1 PCT/JP2006/316761 JP2006316761W WO2007023958A1 WO 2007023958 A1 WO2007023958 A1 WO 2007023958A1 JP 2006316761 W JP2006316761 W JP 2006316761W WO 2007023958 A1 WO2007023958 A1 WO 2007023958A1
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- WIPO (PCT)
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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
- H04L27/2601—Multicarrier modulation systems
- H04L27/2602—Signal structure
- H04L27/2605—Symbol extensions, e.g. Zero Tail, Unique Word [UW]
-
- 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
- H04L27/2605—Symbol extensions, e.g. Zero Tail, Unique Word [UW]
- H04L27/2607—Cyclic extensions
Definitions
- the present invention relates to a radio transmission apparatus and a radio transmission method in which a guard interval length is variable.
- a mobile station since a mobile station receives a signal from a base station after power-on, the mobile station needs to receive a signal transmitted from the base station and adjust the timing.
- symbol synchronization refers to detecting the timing at which data symbols are transmitted in the received signal.
- FIG. 1 shows a transmission signal format from the base station.
- Fig. 1 shows a guard interval (hereinafter referred to as “GI”) being inserted in the OFDM (Orthogonal Frequency Division Multiplex) or single carrier scheme.
- GI guard interval
- the GI characteristics are used to detect the symbol timing of the transmitted signal.
- symbol synchronization can be achieved by operating the autocorrelation detection circuit in the receiver. Monkey.
- the autocorrelation detection circuit detects a value obtained by multiplying the received signal by a signal delayed by the symbol length ⁇ d of the data symbol as an autocorrelation value. As shown in Fig. 2, the autocorrelation detection peak is detected at a period of ⁇ s ( ⁇ d + GI length). As a result, the mobile station can detect the symbol timing.
- Patent Document 1 a technique for controlling such a GI length is disclosed in Patent Document 1.
- the GI length is shortened for mobile stations with close base station power because the maximum delay time of the delayed wave is short, and the maximum delay time of delayed waves for mobile stations far from the base station.
- the GI length is lengthened, a technique for controlling the GI length is disclosed.
- Patent Document 1 JP 2005-150850 A Disclosure of the invention
- Patent Document 1 cannot accurately perform symbol synchronization in a mobile station. This is because, in the autocorrelation circuit, the data symbol to be multiplied with the received signal is delayed by the symbol length ⁇ d. Therefore, if the GI length is variable, the data to be multiplied differs as shown in FIG. Because it becomes impossible to detect
- An object of the present invention is to provide a radio transmission apparatus and a radio transmission method that allow a radio reception apparatus to acquire symbol synchronization accurately and easily using a guard interval having a variable length.
- the radio transmission apparatus of the present invention adds, for each data part storing data symbols, the same symbol as a part of symbols including the last part of the data part to the head of the data part, so that the first guard interval Or the same first symbols as some symbols including the last part of the other data part immediately after the data part are added to the head of the data part, and the first symbol including the last part of the data part is included.
- a transmission means for transmitting for each data part storing data symbols, the same symbol as a part of symbols including the last part of the data part to the head of the data part, so that the first guard interval Or the same first symbols as some symbols including the last part of the other data part immediately after the data part are added to the head of the data part, and the first symbol including the last part of the data part is included.
- FIG. 4 is a block diagram showing a configuration of a radio transmitting apparatus according to Embodiments 1 and 2 of the present invention.
- FIG. 5 is a diagram for explaining a method for generating a long GI in a GI adding unit according to Embodiment 1 of the present invention.
- FIG. 6 is a diagram showing a state in which a short GI and a long GI according to Embodiment 1 of the present invention are multiplexed.
- FIG. 7 is a block diagram showing a configuration of a radio reception apparatus according to Embodiments 1 and 2 of the present invention.
- FIG. 8 is a diagram for explaining correlation calculation in a symbol timing detection unit according to Embodiment 1 of the present invention.
- FIG. 9 is a diagram for explaining a method for generating a long GI in a GI adding unit according to Embodiment 2 of the present invention.
- FIG. 10 is a diagram showing a state in which a short GI and a long GI according to Embodiment 2 of the present invention are multiplexed.
- FIG. 11 is a diagram for explaining correlation calculation in a symbol timing detection unit according to Embodiment 2 of the present invention.
- FIG. 4 is a block diagram showing a configuration of the radio transmission apparatus according to Embodiment 1 of the present invention.
- an error correction coding unit 101 performs error correction coding processing on a transmission bit string and outputs a code signal bit string to a modulation unit 102.
- Modulation section 102 performs modulation processing on the code bit sequence from which error correction code section 101 output is also output, and outputs the modulated signal to GI addition section 103.
- GI adding section 103 selects one of two types of guard intervals (hereinafter referred to as "GI") for each data section in which the modulation signal output from modulation section 102 is stored for a predetermined number of symbols. Append to the beginning of the data section.
- One of the two types of GI is a GI with a short symbol length (hereinafter referred to as “short GI”), and the other is a GI with a longer symbol length than the short GI (hereinafter referred to as “long GI”).
- the transmission data attached with GI is output to the transmission RF section 104.
- the GI adder 103 Details of this will be described later.
- Transmission RF section 104 up-converts the transmission data output from GI addition section 103 to a radio frequency and transmits it from antenna 105.
- the GI adding unit 103 copies a part of the symbols including the last part of the data part, and adds the copied symbol to the head of the data part to make the GI.
- the length of the short GI is the length corresponding to the shortest time of the maximum delay time, and is specified in the system. Also, let ⁇ d be the length of the data part with a short GI.
- a part of symbols including the last part of the second data part immediately after the first data part is copied, and the copied symbols are It is added to the beginning of the first data part as the second GI (indicated by GI 'in the figure), and some symbols including the last part of the first data part are copied, and the copied symbols are
- the first GI is added to the top of the second GI added to the first data part. In this way, the first GI and the second GI are combined to become a long GI. Note that the length of the data part to which the long GI is added is shorter than ⁇ d, and the combined length of the long GI and the data part is s.
- FIG. 6 shows a state in which a short GI and a long GI are multiplexed.
- GI1 to GI6 are numbered, and the same number represents the same symbol.
- FIG. 7 is a block diagram showing the configuration of the radio receiving apparatus according to Embodiment 1 of the present invention.
- the reception RF section 202 down-converts the signal transmitted from the radio transmission apparatus shown in FIG. 4 and received by the antenna 201, and converts the down-converted received signal to the symbol timing detection section 203 and GI removal. Output to part 204.
- Symbol timing detection section 203 performs a correlation operation between the reception signal output from reception RF section 202 and a signal obtained by delaying this reception signal, detects the peak of the correlation value, and starts the head timing of the data section. Is detected. A timing pulse is generated at the start timing of the detected data part, and the generated timing pulse is output to the GI removal unit 204. Details of the symbol timing detection unit 203 will be described later.
- the GI removal unit 204 removes the GI from the received signal power output from the reception RF unit 202 in accordance with the timing noise output from the symbol timing detection unit 203, and receives the GI.
- the signal is output to demodulation section 205.
- Demodulation section 205 performs demodulation processing on the received signal output from GI removal section 204, and outputs the demodulated signal to frame timing detection section 206 and error correction decoding section 207.
- the frame timing detection unit 206 detects the start timing (frame timing) of the frame from the demodulated signal output from the demodulation unit 205 and notifies the error correction decoding unit 207 of the detected frame timing.
- Error correction decoding unit 207 performs error correction decoding processing on the demodulated signal output from demodulation unit 205 based on the frame timing notified from frame timing detection unit 206, and outputs a received bit string.
- the symbol timing detection unit 203 delays the received signal by the data portion length ⁇ d to which the short GI is added, and delays the received signal with the delayed received signal as shown in FIG. Perform correlation calculation to detect the peak of the correlation value.
- ⁇ d the short GI and long GI symbols of the delayed received signal are correlated with the same symbol in the undelayed received signal, and the period ⁇ s ( ⁇ d + short
- the peak of the correlation value appears every time (GI length), and the symbol synchronization can be accurately taken.
- Embodiment 1 when adding a long GI to the first data part, a part of symbols including the last part of the second data part immediately after the first data part is copied, The copied symbol is added to the beginning of the first data part as the second GI, and some symbols including the last part of the first data part are copied, and the copied symbol is added to the first data part.
- symbol synchronization can be obtained easily and accurately even when the wireless receiver receives a signal in which a short GI and a long GI are multiplexed.
- the radio transmitting apparatus and radio receiving apparatus according to Embodiment 2 of the present invention are the same as the configurations shown in FIG. 4 and FIG. 7, respectively, and will be described with reference to FIG. 4 and FIG.
- GI adding section 103 adds a short GI or long GI shift to the head of the data section for each data section storing the modulation signal output from modulation section 102. Specifically, when adding a short GI, copy some symbols including the last part of the data part. Then, the copied symbol is added to the head of the data part to make GI.
- the length of the data part to which the short GI is added is ⁇ d.
- symbol timing detection section 203 delays the received signal by d, and receives the delayed received signal and the undelayed received signal as shown in FIG.
- the correlation calculation is performed and the peak of the correlation value is detected.
- the short GI and long GI symbols of the delayed received signal are delayed and the correlation calculation is performed with the same symbol in the received signal.
- the signal length GI ZP suppresses the decrease of the correlation value in the correlation calculation with the undelayed received signal, so that a peak of the correlation value appears every s periodically, and the symbol synchronization can be obtained accurately.
- Embodiment 2 when adding a long GI to the data part, ZP is added to the head of the data part, and a part of symbols including the last part of the data part are copied.
- symbol synchronization can be performed easily and accurately even if the wireless receiver receives a signal in which a short GI and long GI are multiplexed. Can be earned.
- the long GI is described as being fixed.
- the present invention is not limited to this, and the long GI may be variable.
- each functional block used in the description of each of the above embodiments is typically realized as an LSI that is an integrated circuit. These may be individually integrated into one chip, or part or all of them. One chip may be included to include Here, due to the difference in the power integration of LSI,
- IC system LSI
- super LSI super LSI
- ultra LSI ultra LSI
- the method of circuit integration is not limited to LSI, and may be realized by a dedicated circuit or a general-purpose processor.
- An FPGA Field Programmable Gate Array
- a reconfigurable 'processor that can reconfigure the connection and settings of circuit cells inside the LSI may be used.
- the radio transmission apparatus and radio transmission method according to the present invention can allow a radio reception apparatus to acquire symbol synchronization accurately and easily using a guard interval having a variable length. Applicable to carrier system.
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Synchronisation In Digital Transmission Systems (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2007532205A JP4854668B2 (ja) | 2005-08-26 | 2006-08-25 | 無線送信装置及び無線送信方法 |
US12/064,698 US7961811B2 (en) | 2005-08-26 | 2006-08-25 | Radio transmitting apparatus and radio transmitting method |
EP06783050.5A EP1906568B1 (en) | 2005-08-26 | 2006-08-25 | Radio transmitting apparatus and radio transmitting method |
CN2006800309502A CN101248605B (zh) | 2005-08-26 | 2006-08-25 | 无线发送装置和无线发送方法 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2005-245431 | 2005-08-26 | ||
JP2005245431 | 2005-08-26 |
Publications (1)
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WO2007023958A1 true WO2007023958A1 (ja) | 2007-03-01 |
Family
ID=37771696
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2006/316761 WO2007023958A1 (ja) | 2005-08-26 | 2006-08-25 | 無線送信装置及び無線送信方法 |
Country Status (6)
Country | Link |
---|---|
US (1) | US7961811B2 (ja) |
EP (1) | EP1906568B1 (ja) |
JP (1) | JP4854668B2 (ja) |
CN (2) | CN101248605B (ja) |
RU (1) | RU2008106894A (ja) |
WO (1) | WO2007023958A1 (ja) |
Cited By (1)
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JP2014060747A (ja) * | 2008-03-29 | 2014-04-03 | Qualcomm Incorporated | Fddofdmaまたはsc−fdmシステムにおけるリターンリンクの時間調節 |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
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US9426010B1 (en) * | 2007-11-21 | 2016-08-23 | University Of South Florida | Adaptive symbol transition method for OFDM-based cognitive radio systems |
JP5031600B2 (ja) * | 2008-01-28 | 2012-09-19 | 京セラ株式会社 | 無線通信方法、無線通信システム、基地局、移動局 |
JP5031632B2 (ja) * | 2008-03-26 | 2012-09-19 | 京セラ株式会社 | 無線通信方法、無線通信システム、基地局、移動局 |
CN102273113A (zh) * | 2009-01-08 | 2011-12-07 | 夏普株式会社 | 发送装置、发送方法、通信系统以及通信方法 |
JP6422421B2 (ja) * | 2015-02-12 | 2018-11-14 | 三菱電機株式会社 | 同期タイミング制御装置、同期タイミング制御方法、及び受信機 |
WO2017034448A1 (en) * | 2015-08-26 | 2017-03-02 | Telefonaktiebolaget Lm Ericsson (Publ) | Scheduling of users for multi-user transmission in a wireless communication system |
EP3403382B1 (en) | 2016-01-12 | 2019-10-16 | Telefonaktiebolaget LM Ericsson (PUBL) | Synchronization signal detection for narrow-band iot with variable cyclic prefix length |
WO2018201338A1 (zh) * | 2017-05-03 | 2018-11-08 | 华为技术有限公司 | 通信方法和设备 |
IL263301B2 (en) | 2018-11-25 | 2023-09-01 | Israel Aerospace Ind Ltd | Aircraft and the method of operation of aircraft |
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- 2006-08-25 CN CN2006800309502A patent/CN101248605B/zh active Active
- 2006-08-25 JP JP2007532205A patent/JP4854668B2/ja not_active Expired - Fee Related
- 2006-08-25 EP EP06783050.5A patent/EP1906568B1/en not_active Not-in-force
- 2006-08-25 RU RU2008106894/09A patent/RU2008106894A/ru not_active Application Discontinuation
- 2006-08-25 US US12/064,698 patent/US7961811B2/en not_active Expired - Fee Related
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Also Published As
Publication number | Publication date |
---|---|
CN102123129B (zh) | 2012-11-28 |
JP4854668B2 (ja) | 2012-01-18 |
CN101248605B (zh) | 2011-09-21 |
CN101248605A (zh) | 2008-08-20 |
US7961811B2 (en) | 2011-06-14 |
RU2008106894A (ru) | 2009-08-27 |
EP1906568B1 (en) | 2015-04-01 |
EP1906568A4 (en) | 2014-02-19 |
EP1906568A1 (en) | 2008-04-02 |
CN102123129A (zh) | 2011-07-13 |
US20090245413A1 (en) | 2009-10-01 |
JPWO2007023958A1 (ja) | 2009-03-26 |
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