WO2004079958A1 - マルチキャリア信号の受信処理方法及びこれを適用するマルチキャリア受信装置 - Google Patents
マルチキャリア信号の受信処理方法及びこれを適用するマルチキャリア受信装置 Download PDFInfo
- Publication number
- WO2004079958A1 WO2004079958A1 PCT/JP2003/002565 JP0302565W WO2004079958A1 WO 2004079958 A1 WO2004079958 A1 WO 2004079958A1 JP 0302565 W JP0302565 W JP 0302565W WO 2004079958 A1 WO2004079958 A1 WO 2004079958A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- signal
- multicarrier
- channel
- dimension
- carrier signal
- 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
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
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2649—Demodulators
- H04L27/265—Fourier transform demodulators, e.g. fast Fourier transform [FFT] or discrete Fourier transform [DFT] demodulators
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
- H04L25/0212—Channel estimation of impulse response
- H04L25/0216—Channel estimation of impulse response with estimation of channel length
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
- H04L25/0224—Channel estimation using sounding signals
- H04L25/0228—Channel estimation using sounding signals with direct estimation from sounding signals
- H04L25/023—Channel estimation using sounding signals with direct estimation from sounding signals with extension to other symbols
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
- H04L25/03159—Arrangements for removing intersymbol interference operating in the frequency domain
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
- H04L25/03178—Arrangements involving sequence estimation techniques
- H04L25/03248—Arrangements for operating in conjunction with other apparatus
- H04L25/03254—Operation with other circuitry for removing intersymbol interference
- H04L25/03261—Operation with other circuitry for removing intersymbol interference with impulse-response shortening filters
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
- H04L2025/0335—Arrangements for removing intersymbol interference characterised by the type of transmission
- H04L2025/03375—Passband transmission
- H04L2025/03414—Multicarrier
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
- H04L2025/03433—Arrangements for removing intersymbol interference characterised by equaliser structure
- H04L2025/03439—Fixed structures
- H04L2025/03522—Frequency domain
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
- H04L2025/03433—Arrangements for removing intersymbol interference characterised by equaliser structure
- H04L2025/03535—Variable structures
- H04L2025/03547—Switching between time domain structures
- H04L2025/03566—Switching between time domain structures between different tapped delay line structures
- H04L2025/03585—Modifying the length
-
- 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
- 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) or DMT
Definitions
- the present invention relates to a multicarrier signal reception processing method and a multicarrier receiving apparatus to which the multicarrier signal is applied, and more particularly to an inter-symbol interference equalization of received data in the multicarrier receiving apparatus.
- OFDM orthogonal frequency division multiplexing
- MC-CDMA multi-carrier code division multiple access
- orthogonal frequency division multiplexing transmission system high-speed bit rate transmission is realized using a plurality of narrow band subcarriers orthogonal to each other.
- the frequency bandwidth is divided into smaller ranges, each of which is processed by a lower bit rate subcarrier.
- Multi-carrier modulation systems are advantageous over frequency selective phasing because each subcarrier is not subject to frequency selective phasing.
- the CDMA technique is used for orthogonal frequency division multiplexing (OFDM) modulation as a multiple access multiplexing technique.
- OFDM orthogonal frequency division multiplexing
- FIG. 1 is a configuration example of an MC-CDMA transmitting apparatus using the above-described conventional method, and generates and transmits an MC-CDMA transmission signal.
- binary data 1 is encoded to a predetermined bit length by an encoder 2, and is modulated by a modulator 3 using a modulation scheme such as BPSK, QPSK, or 16-QAM in accordance with the code. It is.
- the modulated data is converted by the serial / parallel converter 4 into Npl data symbols.
- the Npl data symbols are processed at the same time, and one data symbol is duplicated by the duplicator 5 into a data set by a spreading factor (SF).
- the transmitting device transmits data by Npl * SF subcarriers.
- data is multiplexed by a chip that is an orthogonal code having a length SF.
- the MC-CDMA transmitter spreads the signal using the spreading code 6 in the frequency domain, and then, in the inverse fast Fourier transform (IFFT) unit 7, performs inverse fast Fourier transform with a dimension equal to the (Npl * SF) dimension. Perform the conversion.
- IFFT inverse fast Fourier transform
- the data set is converted to serial data by the parallel / serial converter 8, and a guard interval GI is inserted in the insertion unit 8 in order to remove inter-symbol interference.
- the MC-CDMA receiving apparatus corresponding to the MC-CDMA transmitting apparatus of FIG. 1 using the above-described conventional technology has the configuration shown in FIG.
- the guard interval inserted on the transmitting side is removed from the received data by the removing unit 9.
- the data from which the guard interval GI has been removed is converted into a parallel signal by the serial Z-parallel converter 10 and subjected to a discrete Fourier transform by the fast Fourier transformer 11.
- the channel characteristics of each subcarrier are estimated by the pilot symbol in the channel compensator 13.
- fast Fourier transform is performed using a combination method such as orthogonal restoration combination method (ORC), equal gain combination method (EGC), maximum ratio combination method (MR C), and least square error combination method (MM SEC).
- ORC orthogonal restoration combination method
- ECG equal gain combination method
- MR C maximum ratio combination method
- MM SEC least square error combination method
- the output of the channel-compensated Fast Fourier Transformer 11 is consistent in the frequency domain Spread Factor (SF) interval, corresponding to the data set duplication by the Spread Factor (SF) at the transmitter. Is accumulated in the accumulator 14. This allows — Specific data symbols of the users are extracted.
- SF frequency domain Spread Factor
- the signal accumulated by the accumulating unit 14 is converted into a serial signal by the parallel / serial converter 15, demodulated by the demodulator 16, and then decoded by the decoder 17.
- 3 and 4 are configuration examples of an OFDM transmitting apparatus and a receiving apparatus using the above-described conventional method, respectively.
- the configuration of the MC-CDMA transmitting apparatus of FIG. 1 spreading processing using a spreading code and reception are performed. The difference is that the despreading process is not performed in the device.
- the other configurations are the same as those of the MC-CDMA transmitting device and the receiving device shown in FIGS. 1 and 2, and thus further description is omitted.
- an object of the present invention is to provide a multicarrier reception processing method that avoids such a problem and a multicarrier receiving apparatus using the same.
- a first aspect to achieve the object of the present invention is to receive a multi-carrier signal in a multi-carrier system, select a multi-carrier signal in a section longer than one symbol of the received multi-carrier signal, and select the selected multi-carrier signal.
- Performing a discrete Fourier transform performing channel equalization on the signal subjected to the discrete Fourier transform, and reducing the dimension of the channel-equalized signal to the dimension of the received multi-carrier signal.
- the selection of the multi-carrier signal in a section longer than one symbol is performed by a discrete Fourier transform longer than a dimension of the received multi-carrier signal. It is performed for execution.
- the channel equalization is performed by multiplying a multicarrier signal by an equalization coefficient, and thereby, the reception multicarrier in a frequency domain. It is characterized in that the channel distortion effect of the signal is reduced.
- a fourth aspect for achieving the above object of the present invention is characterized in that, in the first aspect, the multi-carrier scheme applies orthogonal frequency division multiplexing. According to a fifth aspect of the present invention for achieving the object of the present invention, in the first aspect, the multi-carrier scheme employs a multi-carrier code division multiple access.
- the received multicarrier signal does not include a guard interval between adjacent symbol frames. It is characterized.
- the discrete Fourier transform longer than the dimension of the multi-carrier signal is an integer multiple of the dimension of the multi-carrier signal.
- An eighth aspect for achieving the above object of the present invention is the seventh aspect, wherein the channel response estimation value for the discrete Fourier transformed output for each channel captures the reduced dimension estimation value. It is characterized in that it is determined at a later time.
- FIG. 1 shows an example of the configuration of a MC-CDMA transmitting apparatus using a conventional method.
- FIG. 2 is a configuration example of an MC-CDMA receiver corresponding to the MC-CDMA transmitter of FIG.
- FIG. 3 is a configuration example of an OFDM [transmitter using a conventional method.
- FIG. 4 is an example of the configuration of an OFDM receiver using a conventional method.
- FIG. 5 is a block diagram of a configuration example of the FDM receiving apparatus according to the present invention.
- FIG. 6 illustrates a processing flow corresponding to the configuration example of the OFDM receiver in FIG. It is a flowchart.
- FIG. 7 is a configuration example of the conversion matrix 111.
- FIG. 8 is a diagram illustrating a configuration of a cluster of 2N continuous points when there is a guard interval. '' '
- FIG. 9 is a diagram showing a frame configuration when a pilot symbol is inserted into a transmission frame in the transmitting apparatus.
- FIG. 10 is a diagram illustrating a configuration of an embodiment of a receiving apparatus in the case of MC_CDMA without using a guard interval.
- FIG. 11 is a diagram showing an embodiment configuration of the 2N fast Fourier (FFT) converter 110 in the receiving device configuration of FIG.
- FFT 2N fast Fourier
- FIG. 12 shows an embodiment of a fast Fourier (FFT) converter 110 when the principle of 2N-dimension fast Fourier transform is further extended to 4N-dimension.
- FFT fast Fourier
- the configuration of the corresponding transmitting apparatus can be the same as the conventional configuration shown in FIGS.
- the multicarrier receiving apparatus of the present invention can be applied to the reception of a signal in which the guard interval GI is not inserted on the transmitting side.
- FIG. 5 is a block diagram showing a configuration example of an OFDM receiving apparatus according to the present invention.
- FIG. 6 is a flowchart illustrating a processing flow corresponding to the configuration example of the OOFDM receiver shown in FIG. 5.
- ISI intersymbol interference
- a received signal sequence is first converted to a parallel signal by a serial Z / parallel converter 10.
- the feature of the present invention is that, as an embodiment, two consecutive symbol frames are used to form a window (/ '-1, z) having a size of 2 N points. Find N data symbols (D1, see Fig. 6).
- FIG. 6 shows a state in which 2 N data symbols are sequentially obtained from two consecutive symbol frames. That is, 2N data symbols are obtained from the -1) th OFDM symbol frame and the zoth OFDM symbol frame, and 2N data symbols are obtained from the zoth OFDM symbol frame and the +1) th OFDM symbol frame. A state in which 2 N data symbols are obtained is shown.
- Discrete Fourier transform is performed on such 2N data symbols by fast Fourier transform processing by a 2N point fast Fourier transformer 110 whose configuration will be described later (step S1).
- step S2 the data (D2) subjected to discrete Fourier transform for each subcarrier is subjected to channel acquisition by the distortion compensator 13 to reduce channel distortion (step S2). Then, before demodulation by the demodulator 16, the dimension of the signal is reduced using a special transformation matrix 111.
- FIG. 7 is a configuration example of the above-described conversion matrix 111.
- a second inverse fast Fourier transformer (IFFT) 112 for 2 N points and an inverse discrete Fourier transform for the lower N points of the conversion processing output of IFFT 112 are used.
- the inverse fast Fourier transformer (IFFT) 1 1 2 performs an inverse discrete Fourier transform on the data (D 3) subjected to channel complementation by an inverse fast Fourier transform (step S 3).
- IFFT inverse fast Fourier transformer
- an inverse discrete Fourier transform is performed on only N points by the second IFFT 113 (step S4), and the data D5 subjected to the inverse discrete Fourier transform is obtained. Get. This reduces dimension 2 N of the received data to dimension N.
- the received data of dimension N is converted into a serial signal by the parallel-to-serial converter 15 and then demodulated by the demodulator 6 corresponding to the modulator 3 on the transmitting side (see FIG. 1). Then, decoding is performed by the decoder 17 corresponding to the channel encoder 2.
- the principle of the present invention is to reduce the length of the fast Fourier transform, that is, the discrete Fourier transform, in order to reduce the influence of inter-symbol interference (ISI). It is an extension. The effect of the preceding OFDM symbol can be mitigated by obtaining the 2N-point fast Fourier transform (FFT) in the multicarrier receiver.
- FFT 2N-point fast Fourier transform
- the OFDM symbol length is assumed to be much larger than the delay dispersion amount, only the residual portion of the received signal is a combination of two consecutive transmission symbols.
- the received signal r ′′ is represented by the following equation 1. ⁇ ⁇
- the basis of the present invention is not to cancel the intersymbol interference but to alleviate the intersymbol interference by equalization using the extension of the discrete Fourier transform length.
- the explanation is divided into three steps.
- G2ATOAr is a complex number and a diagonal matrix.
- Channel distortion compensation is expressed in the frequency domain as follows. ⁇ / ( ⁇ ? ⁇ )
- a 2N point signal is converted to an N point signal stream by a special conversion matrix (conversion matrix 111 shown in FIG. 5).
- conversion matrix 111 shown in FIG. 5
- FIG. 8 is a diagram showing a configuration of a cluster of 2N continuous points when there is a guard interval GI.
- the thick arrows in the figure indicate the configuration of the guard interval GI.
- the (N-1) th OFDM symbol frame and the (Z ') th OFDM symbol frame are combined to obtain 2N points. Furthermore, after a delay of -frame,
- 2N points are obtained by combining the (j) th OFDM symbol frame with the +1) th OFDM symbolic frame.
- the frame in this case is, for example, as shown in FIG. That is, the two OFDM symbols (denoted by P) at the beginning and end of each frame are pilot symbols recognized on the receiving side.
- an N-point fast Fourier transform is applied to the frequency domain. Is converted into a signal. Then, the channel response for each subcarrier is estimated using pilot symbols to compensate for distortion.
- the output of the 2N-dimensional fast Fourier transformer 110 is multiplied by a compensation coefficient.
- a channel response of 2 N points can be obtained by averaging from an estimate obtained in the following manner, that is, from an estimate obtained in dimension N. That is, assuming that the channel response for dimension N is m and the channel response for dimension 2N is g m in the frequency domain, the following equation 4 is obtained.
- the received signal is Y
- the received signal Y is expressed in the frequency domain as follows for each subcarrier in consideration of the channel response.
- H is the channel distortion
- X is the transmission signal
- N is the noise
- y, h, x, and n are a received signal, channel distortion, a transmitted signal, and noise in the time domain, respectively.
- the pilot sequence is inverse fast Fourier transformed at the transmitting side, received at the receiving side via a line (channel), and the corresponding fast Fourier transform is performed. Then, assuming that the bit sequence multiplexed with data is X 1 in the frequency domain, the channel response H 1 is estimated by the following equation.
- Second Embodiment An embodiment of a multi-carrier receiving apparatus according to the present invention in the case of MC-CDMA with channel coding and not using a guard interval The configuration is shown in FIG.
- the transmitter can use the conventional configuration (Fig. 1).
- a fast Fourier (FFT) converter 110 executes a 2N-dimensional discrete Fourier transform longer than one MC-CDMA symbol on the FFT received signal.
- the output of the FFT converter 110 is multiplied by the channel compensator 13 by an equalization coefficient obtained from the channel estimation value.
- the dimension of the signal is made equal to the dimension N of the received MC-CDMA symbol using the transformation matrix 111 shown in equation 3 above.
- the data despread by the despreading code 12 over the section of the SF chip in the frequency domain is accumulated by the accumulator 14 to extract a specific data symbol of one user.
- FIG. 11 shows the configuration of an embodiment of the 2N fast Fourier (FFT) converter 110 in the receiving device configuration of FIG.
- FFT fast Fourier
- the received data is converted into a parallel signal by a serial / parallel converter 10 and then a discrete Fourier transform of N points is performed by a fast Fourier transformer 111 for N points. Then, a serial data string is obtained from the converted data by the parallel Z serial converter 112.
- two continuous data strings are obtained using a butterfly pattern (isomorphic mapping) 1 1 1 4. That is, the output of the fast Fourier transformer 111 1 is given a one-frame delay to the output of the fast Fourier transformer 111 1 by the butterfly Fourier pattern (isomorphic mapping) 1 1 Input the output of 1 as it is.
- discrete Fourier transform is performed on 2N points for two frames, but the application of the present invention is not limited to this. By extension, a larger number of consecutive frames can be used.
- Fig. 12 shows the configuration of an embodiment of the fast Fourier (FFT) converter 110 when expanded to 4N dimensions.
- the frame delay unit 1 1 13 synchronizes with three frame delays, and the butterfly pattern 1 1 1 4 is performed.
- the portion indicated by j in the butterfly pattern 111 of FIG. 12 indicates the square root of “1 1”.
- the converter 111 requires a W4N * N matrix so that the input becomes 4N.
- the present invention it is possible to provide a multi-carrier receiving apparatus that does not require a guard interval and that can avoid the influence of inter-symbol interference (ISI) based on the guard interval length.
- ISI inter-symbol interference
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Discrete Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Mathematical Physics (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
Abstract
Description
Claims
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP20030708493 EP1603259B1 (en) | 2003-03-05 | 2003-03-05 | Method for receiving multicarrier signal and multicarrier receiver comprising it |
| PCT/JP2003/002565 WO2004079958A1 (ja) | 2003-03-05 | 2003-03-05 | マルチキャリア信号の受信処理方法及びこれを適用するマルチキャリア受信装置 |
| JP2004569089A JP3998685B2 (ja) | 2003-03-05 | 2003-03-05 | マルチキャリア信号の受信処理方法及びこれを適用するマルチキャリア受信装置 |
| US11/097,979 US20050232133A1 (en) | 2003-03-05 | 2005-04-01 | Method of receiving and processing a multi-carrier signal and multi-carrier reception device employing the method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/JP2003/002565 WO2004079958A1 (ja) | 2003-03-05 | 2003-03-05 | マルチキャリア信号の受信処理方法及びこれを適用するマルチキャリア受信装置 |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US11/097,979 Continuation US20050232133A1 (en) | 2003-03-05 | 2005-04-01 | Method of receiving and processing a multi-carrier signal and multi-carrier reception device employing the method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2004079958A1 true WO2004079958A1 (ja) | 2004-09-16 |
Family
ID=32948251
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP2003/002565 Ceased WO2004079958A1 (ja) | 2003-03-05 | 2003-03-05 | マルチキャリア信号の受信処理方法及びこれを適用するマルチキャリア受信装置 |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US20050232133A1 (ja) |
| EP (1) | EP1603259B1 (ja) |
| JP (1) | JP3998685B2 (ja) |
| WO (1) | WO2004079958A1 (ja) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2019537865A (ja) * | 2016-10-10 | 2019-12-26 | 京セラ株式会社 | 地理的位置依存制御情報を含む階層化データの伝送 |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5416767A (en) | 1993-02-08 | 1995-05-16 | U.S. Philips Corporation | Method of transmitting a data stream, transmitter and receiver |
| JPH0897798A (ja) * | 1994-09-26 | 1996-04-12 | Nippon Columbia Co Ltd | Ofdm変調器及びofdm復調器 |
| JPH08316932A (ja) * | 1995-05-17 | 1996-11-29 | Nippon Columbia Co Ltd | Ofdm復調器 |
| WO2000038387A1 (de) | 1998-12-21 | 2000-06-29 | Telefonaktiebolaget Lm Ericsson | Verfahren zur übertragung von datenblöcken ohne prefix im guard-intervall und die mittels fft mit einer länge grösser oder gleich der symboldauer demoduliert werden |
| JP2000299674A (ja) * | 1999-04-13 | 2000-10-24 | Toyota Central Res & Dev Lab Inc | 直交周波数分割多重変調方式及び直交周波数分割多重変調装置、並びに直交周波数分割多重復調方式及び直交周波数分割多重復調装置 |
| JP2000299673A (ja) * | 1999-04-13 | 2000-10-24 | Toyota Central Res & Dev Lab Inc | 直交周波数分割多重変調方式及び直交周波数分割多重変調装置、並びに直交周波数分割多重復調方式及び直交周波数分割多重復調装置 |
| JP2002064461A (ja) * | 2000-08-18 | 2002-02-28 | Mitsubishi Electric Corp | 通信装置および通信方法 |
| JP2002111622A (ja) * | 2000-09-28 | 2002-04-12 | Mitsubishi Electric Corp | 通信装置および通信方法 |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2361247C (en) * | 2000-11-06 | 2008-10-07 | Ntt Docomo, Inc. | Transmitter, transmitting method, receiver, and receiving method for mc-cdma communication system |
| US6985533B2 (en) * | 2001-02-07 | 2006-01-10 | Agency For Science, Technology And Research | Method and apparatus for reducing peak to average power ratio in a multi-carrier modulation communication system |
| CN1224228C (zh) * | 2001-02-22 | 2005-10-19 | 皇家菲利浦电子有限公司 | 具备降低复杂度的泄漏矩阵相乘的多载波传输系统 |
| US7027519B2 (en) * | 2001-02-28 | 2006-04-11 | Mitsubishi Electric Research Laboratories, Inc. | Iterative maximum likelihood channel estimation and signal detection for OFDM systems |
| TWI221218B (en) * | 2001-07-13 | 2004-09-21 | Key Stream Co Ltd | Operational circuit of symbol window timing adaptive control type and address generation circuit used therein |
| DE10208717B4 (de) * | 2002-02-28 | 2004-04-01 | Infineon Technologies Ag | Verfahren zum Übertragen eines analogen Datenstroms mit Abtastratenerhöhung im Datenstromsender und Schaltungsanordnung zur Durchführung des Verfahrens |
-
2003
- 2003-03-05 EP EP20030708493 patent/EP1603259B1/en not_active Expired - Lifetime
- 2003-03-05 WO PCT/JP2003/002565 patent/WO2004079958A1/ja not_active Ceased
- 2003-03-05 JP JP2004569089A patent/JP3998685B2/ja not_active Expired - Fee Related
-
2005
- 2005-04-01 US US11/097,979 patent/US20050232133A1/en not_active Abandoned
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5416767A (en) | 1993-02-08 | 1995-05-16 | U.S. Philips Corporation | Method of transmitting a data stream, transmitter and receiver |
| JPH0897798A (ja) * | 1994-09-26 | 1996-04-12 | Nippon Columbia Co Ltd | Ofdm変調器及びofdm復調器 |
| JPH08316932A (ja) * | 1995-05-17 | 1996-11-29 | Nippon Columbia Co Ltd | Ofdm復調器 |
| WO2000038387A1 (de) | 1998-12-21 | 2000-06-29 | Telefonaktiebolaget Lm Ericsson | Verfahren zur übertragung von datenblöcken ohne prefix im guard-intervall und die mittels fft mit einer länge grösser oder gleich der symboldauer demoduliert werden |
| JP2000299674A (ja) * | 1999-04-13 | 2000-10-24 | Toyota Central Res & Dev Lab Inc | 直交周波数分割多重変調方式及び直交周波数分割多重変調装置、並びに直交周波数分割多重復調方式及び直交周波数分割多重復調装置 |
| JP2000299673A (ja) * | 1999-04-13 | 2000-10-24 | Toyota Central Res & Dev Lab Inc | 直交周波数分割多重変調方式及び直交周波数分割多重変調装置、並びに直交周波数分割多重復調方式及び直交周波数分割多重復調装置 |
| JP2002064461A (ja) * | 2000-08-18 | 2002-02-28 | Mitsubishi Electric Corp | 通信装置および通信方法 |
| JP2002111622A (ja) * | 2000-09-28 | 2002-04-12 | Mitsubishi Electric Corp | 通信装置および通信方法 |
Non-Patent Citations (1)
| Title |
|---|
| See also references of EP1603259A4 |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2019537865A (ja) * | 2016-10-10 | 2019-12-26 | 京セラ株式会社 | 地理的位置依存制御情報を含む階層化データの伝送 |
| JP7019686B2 (ja) | 2016-10-10 | 2022-02-15 | 京セラ株式会社 | 地理的位置依存制御情報を含む階層化データの伝送 |
| US11558723B2 (en) | 2016-10-10 | 2023-01-17 | Kyocera Corporation | Layered data transmissions with geographical location dependent control information |
Also Published As
| Publication number | Publication date |
|---|---|
| EP1603259A1 (en) | 2005-12-07 |
| EP1603259B1 (en) | 2012-03-28 |
| US20050232133A1 (en) | 2005-10-20 |
| EP1603259A4 (en) | 2010-04-07 |
| JPWO2004079958A1 (ja) | 2006-06-08 |
| JP3998685B2 (ja) | 2007-10-31 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP4099191B2 (ja) | チャネル推定装置およびチャネル推定方法 | |
| JP3796221B2 (ja) | 直交周波数分割多重接続に基づくデータ通信装置及び方法 | |
| JP4099175B2 (ja) | 複数のチャネルを推定する装置及び方法 | |
| DK2315386T3 (en) | OFDM communications methods and apparatus | |
| CN101023611B (zh) | 用于在正交频分复用系统中频率同步的设备和方法 | |
| WO2018134850A1 (en) | Method and system for providing code cover to ofdm symbols in multiple user system | |
| JP2005537747A (ja) | 周波数領域判定フィードバック等化デバイス及び方法 | |
| WO2006008793A1 (ja) | シングルキャリア受信機における周波数領域イコライゼーション方法及び装置 | |
| CN1961498B (zh) | 通信信号均衡系统和方法 | |
| KR100749447B1 (ko) | 고속 휴대 인터넷 시스템에서 타이밍 에러와 주파수오프셋을 추정하는 방법 및 그 장치 | |
| US20050276339A1 (en) | Training sequence for symbol boundary detection in a multicarrier data transmission system | |
| KR20180052003A (ko) | Ofdm 시스템에서 단일 탭 등화기를 이용한 부반송파의 왜곡 보상 방법 및 그를 위한 장치 | |
| CN101267416B (zh) | 正交频分多址上行传输的发射机、接收机及其方法 | |
| KR101291683B1 (ko) | Tds-ofdm 수신기의 등화방법 및 상기 등화방법을이용한 등화장치 | |
| CN1893409B (zh) | 一种ofdm调制系统中伪随机序列填充的迭代消除方法 | |
| JP2008511196A (ja) | 位相ドリフトを低減するための装置および方法 | |
| JP4463852B2 (ja) | 通信路伝達関数を反復的に推定する装置及び方法 | |
| JP5254526B2 (ja) | 伝送性能を向上させるためのシステム、モデム、受信器、送信器及びその方法 | |
| JP2002330114A (ja) | Gmmseタイプの等化方法および装置ならびに受信機 | |
| KR100667705B1 (ko) | Mimo-ofdm 시스템에서의 송신 장치 및 그 방법,수신 장치 및 그 방법 | |
| KR100664600B1 (ko) | Ofdm 시스템의 곡선접합 채널추정 방법 | |
| WO2004079958A1 (ja) | マルチキャリア信号の受信処理方法及びこれを適用するマルチキャリア受信装置 | |
| CN116527459A (zh) | 一种sc-ifdma系统的信道均衡方法及系统 | |
| KR100781044B1 (ko) | 무선통신시스템을 위한 채널추정장치 및 그 방법 | |
| CN102281224B (zh) | Ofdm接收机及其实现方法 |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| AK | Designated states |
Kind code of ref document: A1 Designated state(s): JP US |
|
| AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR IE IT LU MC NL PT SE SK TR |
|
| 121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
| WWE | Wipo information: entry into national phase |
Ref document number: 2004569089 Country of ref document: JP |
|
| WWE | Wipo information: entry into national phase |
Ref document number: 2003708493 Country of ref document: EP |
|
| WWE | Wipo information: entry into national phase |
Ref document number: 11097979 Country of ref document: US |
|
| WWP | Wipo information: published in national office |
Ref document number: 2003708493 Country of ref document: EP |