WO2010000187A1 - 用于正交频分复用系统的多路复用装置及方法 - Google Patents
用于正交频分复用系统的多路复用装置及方法 Download PDFInfo
- Publication number
- WO2010000187A1 WO2010000187A1 PCT/CN2009/072461 CN2009072461W WO2010000187A1 WO 2010000187 A1 WO2010000187 A1 WO 2010000187A1 CN 2009072461 W CN2009072461 W CN 2009072461W WO 2010000187 A1 WO2010000187 A1 WO 2010000187A1
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- WIPO (PCT)
- Prior art keywords
- differential modulation
- modulation symbol
- subcarriers
- ofdm
- symbol
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Classifications
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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
-
- 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
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/02—Channels characterised by the type of signal
- H04L5/023—Multiplexing of multicarrier modulation signals
-
- 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
- H04L1/0045—Arrangements at the receiver end
- H04L1/0047—Decoding adapted to other signal detection operation
- H04L1/005—Iterative decoding, including iteration between signal detection and decoding operation
-
- 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
- H04L1/0056—Systems characterized by the type of code used
- H04L1/0057—Block codes
-
- 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
- H04L1/0056—Systems characterized by the type of code used
- H04L1/0059—Convolutional codes
-
- 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
- H04L1/0056—Systems characterized by the type of code used
- H04L1/0067—Rate matching
- H04L1/0068—Rate matching by puncturing
-
- 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
- H04L1/0056—Systems characterized by the type of code used
- H04L1/0071—Use of interleaving
Definitions
- the present invention relates to the field of multiplexed signal multiplexing transmission, and more particularly to a multiplexing apparatus and method for an Orthogonal Frequency Division Multiplexing (OFDM) system.
- OFDM Orthogonal Frequency Division Multiplexing
- Fig. 1 shows an orthogonal frequency division multiplexed transmission system.
- the system includes: a plurality of forward error correction (FEC) encoding units S11 for performing encoding on a plurality of source data corresponding to a plurality of traffic patterns to correct errors occurring at the receiver occurring in the data transmission, wherein Each FEC coding unit performs coding of source data corresponding to one of the service modes.
- FEC forward error correction
- a plurality of mapping units S12 are associated with the plurality of FEC encoding units S11, and each mapping unit S12 is configured to map the corresponding encoded source data into symbols.
- a framing unit S13 configured to combine symbols mapped by the plurality of mapping units S12 into a plurality of OFDM frames, divide the plurality of OFDM frames into a predetermined number of frame groups, and insert in each frame group A header, wherein the header includes information about each of the plurality of service modes included in the set of OFDM frames.
- An inverse fast Fourier inverse transform (IFFT) unit S14 modulates the OFDM frame into OFDM symbols by performing an IFFT of a plurality of subcarriers on the OFDM frame.
- a guard interval (GI) insertion unit S 15 is used to insert a GI for suppressing interference between OFDM symbols.
- a radio frequency up-conversion unit S16 is configured to up-convert the OFDM symbol after the insertion of the GI into a radio frequency signal.
- the technical problem to be solved by the present invention is to provide a multiplexer for an OFDM system.
- the multiplex transmission means includes N differential modulation symbol sequences Performing a first unit that combines and maps to the subcarriers of the IFFT; and, performs an IFFT of the plurality of subcarriers to complete a second unit of frequency division multiplexing of the multiple differential modulation symbol sequences.
- the multiplex transmission device can realize multiplexing transmission of multiple signals in a differential OFDM system, and the device is very simple to implement.
- the first unit combines the N differential modulation symbol sequences into the subcarriers of the IFFT in the following manner:
- ⁇ represents the phase-compensated differential modulation symbol transmitted on the ⁇ th subcarrier of the /d OFDM symbol in the first transmission frame
- w represents the mth transmission frame in the sequence of the second differential modulation symbol sequence a differential modulation symbol transmitted on the Ath subcarrier of the OFDM symbol
- ⁇ / is the center frequency interval of the subcarriers corresponding to the adjacent two differential modulation symbols
- ⁇ trim is the reciprocal of the subcarrier spacing.
- the setting of ⁇ / enables all transmission subcarriers to maintain orthogonality.
- ⁇ / 5 + ⁇ ;
- Another technical problem to be solved by the present invention is to provide a multiplex method for an OFDM system.
- the method comprises: combining and mapping N differential modulation symbol sequences to subcarriers of an IFFT; performing IFFT of the plurality of subcarriers to complete frequency division multiplexing of the multiple differential modulation symbol sequences.
- the N differential modulation symbol sequences are combined and mapped to the IFFT subcarriers as follows:
- ⁇ represents the phase-compensated differential modulation symbol transmitted on the ⁇ th subcarrier of the /d OFDM symbol in the first transmission frame
- w represents the mth transmission frame in the sequence of the second differential modulation symbol sequence a differential modulation symbol transmitted on the Ath subcarrier of the OFDM symbol
- ⁇ / is the adjacent two path difference
- the center frequency interval of the subcarrier corresponding to the modulation symbol, ⁇ trimming is the reciprocal of the subcarrier spacing.
- 1 is a schematic diagram of a conventional orthogonal frequency division multiplexing transmission system
- FIG. 2 is a schematic diagram of an embodiment of a multiplexing device provided by the present invention.
- Figure 3a is a schematic structural view of the transmitting end of the ⁇ - ⁇ system
- FIG. 3b is a schematic structural diagram of a transmission unit signal transmission frame generation module of a T-MMB system
- FIG. 4 is a schematic diagram of another multiplexing device embodiment provided by the present invention.
- Figure 5 is a schematic illustration of another embodiment of a multiplexing device provided by the present invention.
- FIG. 6 is a flow chart of an embodiment of a multiplexing method provided by the present invention. detailed description
- Fig. 2 shows an alternative multiplexing device 200 for an OFDM system, the multiplex device 200 comprising a first unit S21 and a second unit S22.
- the first unit S21 is configured to combine and map the N differential modulation symbol sequences to the subcarriers of the IFFT, where N is an integer greater than one.
- the second unit S22 is configured to perform IFFT of the plurality of subcarriers to complete frequency division multiplexing of the multiple differential modulation symbol sequences.
- ⁇ denotes a differential modulation symbol transmitted on the ⁇ th subcarrier of the /d OFDM symbol in the first transmission frame
- w denotes the /OFDM in the mth transmission frame of the second differential modulation symbol sequence a second sub-carrier differential modulation on the symbols of the transmission symbol
- K represents the number of OFDM sub-carriers for each active channel corresponding to the sequence of symbols
- ⁇ / is the frequency spacing of the two adjacent frequency points
- T u is the reciprocal of the sub-carrier spacing.
- the frequency point described herein refers to the center frequency of the OFDM effective subcarrier corresponding to each differential modulation symbol.
- the second unit 822 performs ⁇ ⁇ ⁇ ) to complete the IFFT of the plurality of subcarriers.
- the frequency division multiplexing of the multiple differential modulation symbol sequences is completed.
- the multiplexing device 200 shown in Fig. 2 can be used for digital audio broadcasting (Digital Audio)
- the Broadcast, DAB system or Terrestrial Digital Mobile Broadcasting (T-DMB) system can also be used in the Terrestrial Mobile Multimedia Broadcasting (T-MMB) system.
- T-DMB Terrestrial Mobile Multimedia Broadcasting
- Fig. 3a shows a structure of the transmitting end of the T-MMB system
- Fig. 3b shows the structure of the transmitting end signal unit transmission frame generating block S31 of the T-MMB system.
- the signal unit transmission frame generation module S31 includes a service multiplexing unit S301, a plurality of first energy diffusion units S302, a plurality of Low Density Parity Check (LDPC) coding units S303, and a plurality of time domain interleaving units S304.
- LDPC Low Density Parity Check
- Main traffic channel multiplexing unit S305 Main traffic channel multiplexing unit S305, second energy spreading unit S306, punctured convolutional coding unit S307, bit transmission frame multiplexing unit S308, symbol mapping unit S309, frequency domain interleaving unit S310, differential modulation unit S311, OFDM symbol generation The unit S312 and the symbol transmission frame multiplexing unit S313.
- the service multiplexing unit S301 is configured to perform service multiplexing on the upper layer data to obtain service data and configuration information thereof.
- a first energy spreading unit S302 and an LDPC encoding unit S303 and a time domain interleaving unit S304 are sequentially connected in series for performing energy spreading, LDPC encoding and time domain interleaving on the service data in one subchannel.
- the primary traffic channel multiplexing unit S305 is configured to combine the data bits output by each time domain interleaving unit S304 into a Common Interleaved Frame (CIF), and then multiplex the obtained CIFs.
- CIF Common Interleaved Frame
- the second energy diffusion unit S306 and the punctured convolutional coding unit S307 are connected in series for performing energy diffusion and puncturing convolutional coding on the configuration information data obtained by the service multiplexing unit S301.
- the bit transmission frame multiplexing unit S308 is configured to perform bit transmission frame multiplexing with the CIF encoded data by the punctured convolutional coding unit S307.
- the OFDM symbol generating unit S312 is configured to respectively generate the differential modulation symbol sequence obtained by the differential modulation unit S311 together with the phase reference symbol and the null symbol to generate respective OFDM symbols.
- the symbol transmission frame multiplexing unit S313 is configured to multiplex the continuous OFDM symbols generated by the OFDM symbol generating unit S312 into signal unit transmission frames.
- the T-MMB system can work in two modes, the first is the 1.7MHz mode of operation and the second is the 8MHz mode of operation.
- the multiple differential modulation symbol sequences can be frequency division multiplexed and transmitted by the multiplexing device 200 at the transmitting end.
- the T-MMB system has multiple operating modes, each of which has its corresponding subcarrier spacing.
- Up to 5 differential modulation symbol sequences can be pressed in the 8MHz channel bandwidth Perform frequency division multiplexing.
- FIG. 4 shows another alternative multiplexing device 400 for an OFDM system in which a third unit for the symbol sequence insertion guard interval after IFFT is added to the device 400. S41, and a fourth unit S42 for inserting a null symbol before each transmission frame.
- the effective bandwidth occupied by a sequence of differential modulation symbols is also 1.536 MHz.
- the DAB system can be modified to operate in an 8 MHz channel bandwidth, using a multiplexing device 200 or a multiplexing device. 400
- the T-MMB system can work in two ways, the first one is
- the 1.7MHz mode of operation the second is the 8MHz mode of operation.
- the transmitter When working in the 1.7MHz mode, the transmitter only sends one signal.
- the transmitter When working in the 8MHz mode, the transmitter needs to transmit multiple signals in frequency division multiplexing.
- the receiving end needs to receive in two different ways, which not only increases the complexity of the receiving end but also increases the power consumption of the receiving end.
- a phase compensation unit may be added before the first unit, as shown in the figure. 5 is shown.
- the phase compensation unit S51 is configured to separately phase compensate the N differential modulation symbol sequences.
- the phase compensation unit S51 transmits the phase-compensated N-way symbol sequence to the first unit S21.
- the phase compensation unit S51 can phase compensate each of the differential modulation symbol sequences according to the frequency position of each differential modulation symbol sequence.
- phase compensation unit S51 phase compensates each differential modulation symbol sequence as follows:
- the first unit S21 combines and maps the N-phase compensated symbol sequences to the sub-carriers of the IFFT as follows:
- the second unit 822 After the first unit S21 combines and maps the symbol sequence after the loop phase compensation to the subcarriers of the IFFT, the second unit 822 performs ⁇ ⁇ ) to complete the IFFT of the plurality of subcarriers, and the frequency of the multiple differential modulation symbol sequences. Sub-multiplexing.
- the transmitting end since one channel of service data is transmitted only in a fixed small frequency band, when operating in the 8 MHz mode of operation, the transmitting end separately compensates each differential modulation symbol sequence, and the receiving end can press In the same way as the 1.7MHz working mode, the relevant service data transmitted by the transmitting end in the 8MHz working mode is received in a fixed small frequency band, so that the receiving is compatible. Since the receiving end can use the 1.7MHz system receiver to be compatible with the receiving signal transmitted by the transmitting end in 1.7MHz or 8MHz mode, the complexity and power consumption of the 1.7MHz system receiver are lower than that of the 8MHz receiver, which is not only reduced. The complexity and power consumption of the receiving end can also meet the requirement of one receiver receiving two system programs, which effectively saves user costs.
- the device can be used not only for the T-MMB system but also for the DAB system. If the DAB system is required to operate in the 8MHz channel bandwidth mode in the future, the device can be used for the DAB system to reduce the complexity and power consumption, and one receiver can receive two system programs.
- Figure 6 shows an alternative multiplexing method for an OFDM system.
- the N differential modulation symbol sequences are combined and mapped to the subcarriers of the IFFT.
- an IFFT of a plurality of subcarriers is performed. After the IFFT of multiple subcarriers is completed Frequency division multiplexing of pairs of multiple differential modulation symbol sequences.
- weft(z mlw ) is performed to complete the IFFT of the plurality of subcarriers.
- the above method may be used for W DAB system, it may also be used for T-MMB system. Next, a case where the method is applied in the T-MMB system will be described.
- the T-MMB system can work in two modes, the first is the 1.7MHz mode of operation and the second is the 8MHz mode of operation.
- the multi-path differential modulation symbol sequence can be frequency-division multiplexed and transmitted at the transmitting end by using the method.
- the T-MMB system has multiple operating modes, each of which has its corresponding subcarrier spacing.
- Up to 5 differential modulation symbol sequences can be pressed in the 8MHz channel bandwidth Perform frequency division multiplexing.
- the effective bandwidth occupied by a differential modulation symbol sequence is also 1.536MHz.
- the DAB system can be modified to work in the 8MHz mode. The above method is used to divide the 5 differential modulation symbol sequences in the 8MHz channel. Press within bandwidth
- the ⁇ - ⁇ system can work in two modes, the first one is the 1.7MHz working mode and the second is the 8MHz working mode.
- the transmitter When working in the 1.7MHz mode, the transmitter only sends one signal.
- the 8MHz mode the transmitter needs to transmit multiple signals in frequency division multiplexing.
- the receiver needs to be implemented in two different ways. Receiving, this will not only increase the complexity of the receiving end but also increase the power consumption of the receiving end.
- the differential modulation of each path may be performed before the differential mapping of the differential modulation symbol sequences is performed. The symbol sequence is phase compensated separately.
- Each phase of the differential modulation symbol sequence can be phase compensated according to the position of the frequency point at which each differential modulation symbol sequence is located.
- An alternative is to phase compensate each differentially modulated symbol sequence as follows:
- the N phase-compensated symbol sequences are combined and mapped to the IFFT subcarriers as follows:
- ⁇ ⁇ is performed to complete the IFFT of the plurality of subcarriers, and the frequency division multiplexing of the multiple differential modulation symbol sequences.
- the transmitting end since one channel of service data is transmitted only in a fixed small frequency band, when operating in the 8 MHz mode of operation, the transmitting end separately compensates each differential modulation symbol sequence, and the receiving end can press In the same way as the 1.7MHz working mode, the relevant service data transmitted by the transmitting end in the 8MHz working mode is received in a fixed small frequency band, so that the receiving is compatible. Since the receiving end can use the 1.7MHz system receiver to be compatible with the receiving signal transmitted by the transmitting end in 1.7MHz or 8MHz mode, the complexity and power consumption of the 1.7MHz system receiver are lower than that of the 8MHz receiver, which is not only reduced. The complexity and power consumption of the receiving end can also meet the requirement of one receiver receiving two system programs, which effectively saves user costs.
- the above method can be used not only for the T-MMB system but also for the DAB system. If the DAB system is required to operate in the 8MHz channel bandwidth mode in the future, the device can be used for the DAB system to reduce the complexity and power consumption, and one receiver can receive two system programs.
- the present invention also provides an integrated circuit for implementing the apparatus or method of any of the above embodiments.
- the invention further provides a computer readable medium storing a program for implementing the method of any of the above embodiments.
- DSPs digital signal processors
- ASICs application specific integrated circuits
- FPGAs field programmable gate arrays
- a general purpose processor may be a microprocessor, but in another case the processor may be any conventional processor, controller, microcontroller or state machine.
- the processor may also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such structure.
- the steps of the method described in connection with the above disclosed embodiments may be embodied directly in hardware, a software module executed by a processor, or a combination of the two.
- Software modules may reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the art.
- a typical storage medium is coupled to the processor such that the processor can read information from the storage medium and can write information to the storage medium.
- the storage medium is an integral part of the processor.
- the processor and storage medium may be present in an ASIC.
- the ASIC may exist in a subscriber station.
- the processor and storage medium may reside as discrete components in the subscriber station.
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- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Mobile Radio Communication Systems (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP09771957A EP2306680A1 (en) | 2008-06-30 | 2009-06-26 | Multiplexing device and method for orthogonal frequency division multiplexing system |
US13/001,643 US20110188589A1 (en) | 2008-06-30 | 2009-06-26 | Multiplexing device and method for orthogonal frequency division multiplexing system |
AU2009266185A AU2009266185A1 (en) | 2008-06-30 | 2009-06-26 | Multiplexing device and method for orthogonal frequency division multiplexing system |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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CN200810115860.4 | 2008-06-30 | ||
CN2008101158604A CN101340415B (zh) | 2008-06-30 | 2008-06-30 | 用于正交频分复用系统的多路复用装置及方法 |
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WO2010000187A1 true WO2010000187A1 (zh) | 2010-01-07 |
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PCT/CN2009/072461 WO2010000187A1 (zh) | 2008-06-30 | 2009-06-26 | 用于正交频分复用系统的多路复用装置及方法 |
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US (1) | US20110188589A1 (zh) |
EP (1) | EP2306680A1 (zh) |
KR (1) | KR20110036921A (zh) |
CN (1) | CN101340415B (zh) |
AU (1) | AU2009266185A1 (zh) |
WO (1) | WO2010000187A1 (zh) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2013185640A1 (zh) * | 2012-06-16 | 2013-12-19 | 天地融科技股份有限公司 | 音频数据传输方法 |
WO2013185596A1 (zh) * | 2012-06-16 | 2013-12-19 | 天地融科技股份有限公司 | 音频数据传输系统、音频数据传输装置及电子签名工具 |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
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CN101340415B (zh) * | 2008-06-30 | 2012-07-04 | 北京新岸线移动通信技术有限公司 | 用于正交频分复用系统的多路复用装置及方法 |
CN102185821B (zh) * | 2011-05-10 | 2014-04-23 | 哈尔滨工业大学 | 恶劣电磁环境下基于认知无线电的通信弱信号高质量抗干扰通信系统 |
CN102624672B (zh) * | 2012-05-02 | 2015-10-14 | 厦门大学 | 基于分块的双变换正交频分复用通信方法 |
CN102891824B (zh) * | 2012-10-18 | 2016-03-30 | 复旦大学 | 高速光dft-s ofdm调制系统中基于射频导频的噪声扩散抑制方法 |
JP6542372B2 (ja) * | 2014-10-12 | 2019-07-10 | エルジー エレクトロニクス インコーポレイティド | 放送信号送信装置、放送信号受信装置、放送信号送信方法及び放送信号受信方法 |
CN106301693B (zh) * | 2015-05-21 | 2019-07-02 | 上海无线通信研究中心 | 一种基于码本映射的无线信号调制方法 |
CN106161310B (zh) * | 2016-07-21 | 2019-05-17 | 南京邮电大学 | 一种多载波差分混沌移位键控调制解调方法及调制解调器 |
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CN1606298A (zh) * | 2004-11-12 | 2005-04-13 | 东南大学 | 利用快速傅立叶变换实现全数字无线通信系统 |
CN101340415A (zh) * | 2008-06-30 | 2009-01-07 | 北京新岸线移动多媒体技术有限公司 | 用于正交频分复用系统的多路复用装置及方法 |
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JP3797510B2 (ja) * | 1997-07-16 | 2006-07-19 | ソニー株式会社 | 通信方法、送信装置、受信装置及びセルラー無線通信システム |
WO2005015732A2 (en) * | 2003-08-07 | 2005-02-17 | Nokia Corporation, | Method and apparatus for discrete power synthesis of multicarrier signals with constant envelope power amplifiers |
CN1330193C (zh) * | 2003-11-20 | 2007-08-01 | 中兴通讯股份有限公司 | 一种用于差分偏移四相键控解调器的位同步装置 |
US7453794B2 (en) * | 2003-12-16 | 2008-11-18 | University Of Florida Research Foundation, Inc. | Channel estimation and synchronization with preamble using polyphase code |
EP3447935B1 (en) * | 2004-04-02 | 2022-01-26 | Apple Inc. | Wireless communication methods, systems, and signal structures |
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2008
- 2008-06-30 CN CN2008101158604A patent/CN101340415B/zh active Active
-
2009
- 2009-06-26 AU AU2009266185A patent/AU2009266185A1/en not_active Abandoned
- 2009-06-26 US US13/001,643 patent/US20110188589A1/en not_active Abandoned
- 2009-06-26 WO PCT/CN2009/072461 patent/WO2010000187A1/zh active Application Filing
- 2009-06-26 KR KR1020117002300A patent/KR20110036921A/ko not_active Application Discontinuation
- 2009-06-26 EP EP09771957A patent/EP2306680A1/en not_active Withdrawn
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
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CN1606298A (zh) * | 2004-11-12 | 2005-04-13 | 东南大学 | 利用快速傅立叶变换实现全数字无线通信系统 |
CN101340415A (zh) * | 2008-06-30 | 2009-01-07 | 北京新岸线移动多媒体技术有限公司 | 用于正交频分复用系统的多路复用装置及方法 |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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WO2013185640A1 (zh) * | 2012-06-16 | 2013-12-19 | 天地融科技股份有限公司 | 音频数据传输方法 |
WO2013185596A1 (zh) * | 2012-06-16 | 2013-12-19 | 天地融科技股份有限公司 | 音频数据传输系统、音频数据传输装置及电子签名工具 |
Also Published As
Publication number | Publication date |
---|---|
CN101340415B (zh) | 2012-07-04 |
KR20110036921A (ko) | 2011-04-12 |
US20110188589A1 (en) | 2011-08-04 |
AU2009266185A1 (en) | 2010-01-07 |
CN101340415A (zh) | 2009-01-07 |
EP2306680A1 (en) | 2011-04-06 |
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