WO2004068757A1 - Ofdm信号の衝突位置検出装置及びofdm受信装置 - Google Patents
Ofdm信号の衝突位置検出装置及びofdm受信装置 Download PDFInfo
- Publication number
- WO2004068757A1 WO2004068757A1 PCT/JP2004/000458 JP2004000458W WO2004068757A1 WO 2004068757 A1 WO2004068757 A1 WO 2004068757A1 JP 2004000458 W JP2004000458 W JP 2004000458W WO 2004068757 A1 WO2004068757 A1 WO 2004068757A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- data signal
- signal
- power
- data
- collision
- Prior art date
Links
Classifications
-
- 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
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/713—Spread spectrum techniques using frequency hopping
- H04B1/715—Interference-related aspects
-
- 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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/713—Spread spectrum techniques using frequency hopping
- H04B1/715—Interference-related aspects
- H04B2001/7152—Interference-related aspects with means for suppressing interference
-
- 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
-
- 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
Definitions
- the present invention relates to an OFDM signal collision position detecting device, an OFDM receiving device, and an OFDM receiving device.
- the method is suitable for application to, for example, an OFDM receiver used in an OFDM system of a frequency hopping system.
- the OFDM system to which frequency hopping is applied uses different hopping patterns among a plurality of cells to perform communication by averaging interference between cells.
- OFDM signals having different hopping patterns are transmitted from the base station BSA of the cell A and the base station BSB of the cell B. Normally, this hopping pattern is randomly determined in cell A and cell B, so that a collision may occur by accident at a certain subcarrier at a certain point in time.
- FIG. 2 shows a frequency hopping OFDM signal transmitted from base station BS A of cell A and a frequency hopping OFDM signal transmitted from base station B SB of cell B.
- One unit on the vertical axis indicates a subcarrier, and one unit on the horizontal axis indicates one burst period. That is, it is assumed that one OFDM symbol is arranged in one square in the figure.
- the normal error correction code performs error correction on the assumption that the communication channel is affected by white Gaussian noise.
- the communication path is not white Gaussian noise but impulse noise is added. Therefore, there is a problem that the performance of error correction is deteriorated.
- a subcarrier causing interference is detected by monitoring the state of a pilot signal arranged on a specific subcarrier of an OFDM signal.
- the OFDM system using the conventional frequency hopping cannot accurately detect the data symbol in which the collision occurs. As a result, there is a problem that the error rate characteristic of the decoded data is deteriorated.
- this may occur not only in an OFDM system using frequency hopping but also in an OFDM system having a frequency scheduler, for example.
- this type of OFDM system it is considered that the channel quality of each subcarrier is measured for each cell, and data symbols are arranged and transmitted on subcarriers with good channel quality. In such a case, collision may occur on a certain subcarrier between adjacent cells, which may cause degradation of the error rate characteristics of decoded data. Disclosure of the invention
- An object of the present invention is to provide an OFDM signal collision position detecting apparatus and method capable of accurately detecting a data symbol position colliding between a plurality of cells. It is another object of the present invention to provide an OFDM receiving apparatus and method capable of obtaining decoded data with improved error rate characteristics using detected collision position information.
- the purpose of this purpose is to compare the received power of the data symbol predicted from the received power of the pilot symbol with the actual received power of the data symbol for each subcarrier and each burst period. If the received power fluctuates compared to the expected received power, the data The symbol is achieved by considering that there is interference (that is, collision between adjacent cells). Then, the error rate characteristic of the decoded data can be improved by notifying the error correction decoding unit of the detected data symbol.
- Figure 1 shows neighboring cells
- Figure 2 is a diagram for explaining the collision of the data symbol of the frequency hopping OFDM signal
- Figure 3 is a diagram showing the quality of data symbol degradation due to collisions
- FIG. 4 is a block diagram showing a configuration of an OFDM receiving apparatus according to Embodiment 1 of the present invention.
- FIG. 5 is a diagram for explaining a threshold XI for detecting a data symbol whose reception power has increased due to a collision
- FIG. 6 is a diagram for explaining a threshold value X2 for detecting a data symbol whose reception power is reduced due to a collision
- Figure 7 shows the phase relationship between cells when the received power increases due to collisions
- Figure 8 shows the phase relationship between cells when the received power decreases due to collisions
- FIG. 9 is a block diagram illustrating a configuration of an OFDM receiver according to a second embodiment
- FIG. 10 is a block diagram illustrating a configuration of an OFDM receiver according to a third embodiment
- FIG. 11 is a threshold value for each SIR Curve showing the relationship between error rate and error rate
- FIG. 12 is a block diagram showing a configuration of the OFDM receiving apparatus according to the fourth embodiment.
- FIG. 4 shows the configuration of the OFDM receiving apparatus according to Embodiment 1 of the present invention.
- the OFDM receiver 100 receives the frequency-hopped OFDM signal with the antenna AN, and after performing radio reception processing such as down-conversion and analog-to-digital conversion processing by the reception radio unit (reception RF) 101, And sent to the fast Fourier transform circuit (FFT) 102.
- the FFT 102 performs a fast Fourier transform process on the input signal to obtain a symbol superimposed on each subcarrier, which is decoded by an error correction decoding unit 103, a pilot received power measurement unit 104, and a data Transmitted to the power measurement unit 105.
- the pilot received power measuring section 1 ⁇ 4 measures the received power of the pilot symbol of each subcarrier by measuring the received power of the pilot symbol superimposed on the predetermined subcarrier at a predetermined timing.
- the pilot symbol unlike the data symbol, is located at a position where collision does not occur between adjacent cells, so the pilot received power measurement unit 104 considers the influence of interference between adjacent cells.
- the received power of the non-radio symbol is measured.
- the data part received power prediction unit 106 predicts the received power of the data symbol without interference (collision) based on the power ratio information between the pilot symbol and the data symbol, and compares the prediction result with the power comparison unit. Send to 107.
- pilot symbols are transmitted with higher power than data symbols, and the power ratio is a fixed value.
- the OFDM receiver 100 stores the power ratio information in a memory (not shown). For example, if the power ratio between the pilot symbol and the data symbol is 2: 1, the data part received power predicting unit 106 multiplies the measurement result of the pilot received power measuring unit 104 by 1/2 to obtain the data symbol. Output as predicted received power.
- the data section received power measuring section 105 measures the received power of the actually received data symbol for each subcarrier and burst period, and sends the measurement result to the power comparing section 107.
- the power comparison unit 107 uses a subcarrier to calculate the received power of the data symbol predicted by the data part received power prediction unit 106 and the actual received power of the data symbol measured by the data part received power measurement unit 105. Each time, and sends the comparison result to the collision position detection unit 108. In practice, for each corresponding subcarrier and burst period, the difference between the prediction result by the data part received power prediction unit 106 and the measurement result by the data part received power measurement unit 105 is calculated, and this difference is calculated as the collision position. It is sent to the detector 108.
- the collision position detection unit 108 Based on the difference value from the power comparison unit 107, the collision position detection unit 108 detects the fluctuation of the actually measured data signal reception power with respect to the data signal reception power predicted from the pilot signal. By detecting a large position (that is, a position with a large difference value), a data symbol position colliding between a plurality of cells is detected.
- the collision position detection unit 108 performs the detection processing only at the position indicated by the hopping pattern information (subcarrier and burst period: for example, the position of the cell A in FIG. 2). This hopping pattern has been previously notified from the base station of the cell to which the own station belongs.
- the collision position detection unit 108 sends this to the error correction decoding unit 103 as collision position information.
- the collision position detection unit 108 detects a collision position by performing a threshold determination using two thresholds: X1 and X2.
- the first threshold X 1 is a threshold in the brush direction in consideration of an increase in power due to collision
- the second threshold X 2 is This is a negative threshold value in consideration of a decrease in force.
- the collision position detector 108 actually measures the data symbol received power predicted from the pilot symbol and increases the received power of the data symbol in the positive direction. If the threshold value is larger than the first threshold value X1, or if it is smaller than the second threshold value X2 in the negative direction, it is detected that the collision has occurred. This makes it possible to detect data symbol collision without any omission even if data symbols of any phase collide.
- the error correction decoding unit 103 obtains decoded data by performing the decoding process while performing the error correction process on the data symbol. At this time, the likelihood of the data symbol at the position where the collision is detected by the collision position detection unit 108 is reduced, and error correction decoding processing is performed. For example, when performing error correction using a Reed-Solomon code, an error correction process is performed by regarding a data symbol in which a collision is detected as being lost. This makes it possible to exclude impulsive noise due to data symbol collision from error correction processing, thereby improving the error rate characteristics of decoded data.
- the received power of the data symbol is predicted based on the received power of the pilot symbol, and when the difference between this predicted value and the actual received power of the data symbol is large, the data symbol at the hobbing position is determined.
- colliding with the data symbol of another cell it is possible to accurately detect a data symbol having a collision between a plurality of cells.
- the prediction is performed using the first and second thresholds X 1 and X 2.
- a collision occurs when the received power of the data symbol measured with respect to the received power of the data symbol is larger in the plus direction than the first threshold value X1 or smaller in the minus direction than the second threshold value X2.
- this effort is not limited to this. Simply, a threshold value X at which the measured value is considered to have fluctuated with respect to the predicted value is determined, and the threshold value X fluctuates more than X [dB]. If you do, you may consider it a collision. This is the same for Embodiments 2 to 4 described later.
- the information of the data symbol in which the collision detected by the collision position detection unit 108 has occurred is notified to the error correction decoding unit 1 ⁇ 3, and the error rate characteristic of the error correction decoding unit 103 is notified.
- the use of the data symbol information having a collision detected by the collision position detection unit 108 is not limited to this.
- the detected data symbol information may be used as information for a retransmission request, and can be used for various purposes.
- the pilot reception power measurement unit 104 as a known signal measurement unit
- the data reception power measurement unit 105 as a data signal measurement unit
- the data reception power unit as a data signal prediction unit
- a collision position detection device including a prediction unit 106, a power comparison unit 107 as power comparison means, and a collision position detection unit 108 as collision position detection means is used, a collision occurs. It is possible to accurately detect the position of an existing data symbol.
- the present invention is not limited to this, and a plurality of cells such as an OFDM system having a frequency scheduler are used. It can be widely applied to OFDM systems in which subcarriers in which data symbols are arranged may collide between them.
- OFDM receiving apparatus 200 includes an error rate calculating section 201 for calculating an error rate of decoded data, and a collision position detecting section 108 according to the error rate.
- the configuration is the same as that of the OFDM receiving apparatus 100 of the first embodiment, except that the OFDM receiving apparatus 100 of the first embodiment has a threshold control unit 202 that changes the threshold.
- Error rate calculation section 201 calculates the error rate of the decoded data output from error correction decoding section 103, and sends the calculated error rate to threshold value control section 202.
- the threshold controller 202 changes the threshold used in the collision position detector 108 according to the error rate. As a result, in the OFDM receiving apparatus 200 of this embodiment, a threshold value with which the error rate characteristic is the best can be used.
- the threshold control unit 202 changes the threshold value adaptively while monitoring the error rate, thereby converging the threshold value to an optimum value that provides the best error rate characteristic, and Feed to 108.
- the threshold value X used in the collision position detection unit 108 there is a value that improves the performance (error rate characteristic) most. This is because if the threshold X is too large, the number of data symbols that are regarded as collisions decreases, and the effect of improving the performance of error correction due to erasure decreases, resulting in poor performance. Conversely, if the threshold value X is too small, performance degrades because more data symbols are considered to be collisions and almost all symbols are considered to be lost.
- the threshold control unit 202 that controls the threshold value used in the collision position detection unit 108 to an optimum value is provided.
- the OFDM receiver 200 capable of further improving the error rate characteristic of the decoded data can be realized.
- FIG. 10 in which parts corresponding to FIG. 4 are assigned the same reference numerals as in FIG. 10 shows the configuration of the OFDM receiving apparatus according to Embodiment 3.
- the OFDM receiving apparatus 300 includes a reception average SIR detection section 301 that detects an average SIR (Signal to Interference Eatio) of the received OFDM signal as reception quality detection means, and a threshold value associated with the reception quality.
- Embodiment 1 except that data is stored and a table section 302 outputs threshold data corresponding to the detected reception quality to the collision position detection section 108.
- the configuration is the same as that of the OFDM receiver 100.
- the reception average SIR detection section 301 detects the SIR based on the pilot symbol, and detects the reception quality of the received OFDM signal, for example, by calculating the average value of the SIR during one slot period.
- the detected reception quality is sent to table section 302.
- the table unit 302 includes, every predetermined SIR (in FIG. 11, only 15 [dB] and 10 [dB] are shown for simplicity in FIG. 11).
- the optimum threshold data th 1 and th 2 for the SIR are stored.
- the table unit 302 sends out the optimal thresholds t h1 and th 2 of the SIR closest to the SIR output from the reception average SIR detection unit 301 to the collision position detection unit.
- the optimum threshold value th1 is a relatively small value.
- the worse the SIR (10 [dB] in the figure) the greater the fluctuation of the received signal due to interference.
- the optimum threshold value th2 is a relatively large value.
- the table unit 302 storing the optimum threshold according to the reception quality is provided.
- the threshold value becomes smaller than the optimal threshold values th1 and th2, the number of data symbols for which collisions are detected increases, and the threshold value becomes larger than the optimal threshold values th1 and th2.
- the number of data symbols for which collisions are detected decreases as the number of errors increases, and the error rate performance deteriorates in any case.
- setting the threshold value to infinity corresponds to conventional general processing that does not consider collision at all.
- a reception average SIR detection section 301 for detecting reception quality is provided, and a table section 302 storing an optimum threshold value according to reception quality is provided.
- the collision position detection unit 108 uses the optimum threshold value output from the table unit 302 according to the reception quality.
- FIG. 12 shows the configuration of an OFDM receiving apparatus according to the fourth embodiment.
- the OFDM receiving apparatus 400 as a reception quality detecting means, a reception average SIR detection section 401 detecting an average SIR (Signal to Interference Ratio) of the received OFDM signal, a table creation section 402,
- the configuration is the same as that of the OFDM receiving apparatus 100 of the first embodiment, except that the OFDM receiving apparatus 100 has an error rate calculating section 4003 and a threshold control section 404.
- the reception average SIR detection section 401 detects the SIR based on the pilot symbols, and calculates the average value of the SIR during one slot period, for example, to detect the reception quality of the received OFDM signal.
- the detected reception quality is sent to the table creation unit 402.
- the table creation unit 402 includes, for each reception quality (in this embodiment, average SIR), the threshold value input from the threshold value control unit 404 and the error calculated by the error rate calculation unit 403. Create a lookup table that shows the relationship with the rate. Further, the table creation unit 402 supplies data corresponding to the SIR detected by the reception average SIR detection unit 401 to the threshold control unit 404 among the data of the created reference table.
- reception quality in this embodiment, average SIR
- the threshold controller 404 refers to the reference data input from the table creator 402 to find an optimal threshold and sends it to the collision position detector 108. Specifically, the table creation unit 402 collects data indicating a characteristic curve for each reception quality as shown in FIG. 13, and the threshold control unit 404 receives data corresponding to the reception quality. The optimum thresholds th1 and th2 are found and sent to the collision position detector 108.
- the difference from the third embodiment is that, in the third embodiment, the optimum threshold value is stored in advance in the table section 302 for each reception quality, whereas in the third embodiment, the table creation section 40 2 creates a characteristic curve as shown in Fig. 13 while updating the data sequentially It is a point to do. This makes it possible to set a more appropriate optimal threshold from the relationship between the actual threshold and the error rate, and can further improve the error rate characteristics.
- a reception average SIR detection unit 401 detecting a reception quality
- a threshold control unit 404 and an error rate calculation unit 403
- the error rate characteristic can be further improved compared to the third embodiment.
- a DM receiver can be realized.
- the case where the average SIR is detected as the reception quality is described.However, for example, a CIR (Carrier to Interference Ratio) may be detected, and the reception quality to be detected is not limited to the SIR. .
- the optimal threshold value according to the SIR is stored in the template section 302 of the third embodiment, but the present invention is not limited to this, and the optimal threshold value according to the reception quality may be stored.
- the table creator 402 of the fourth embodiment is not limited to the force SIR described in the case of creating a table in which the threshold and the error rate are associated for each predetermined SIR. It is sufficient to create a table for which the correspondence between the threshold and the error rate is associated with each quality.
- One aspect of the OFDM signal collision position detection device of the present invention is an OFDM signal collision position detection device that detects a collision position of OFDM signals transmitted from a plurality of cells, and includes a reception power of a known signal.
- Known signal measuring means for measuring the received power of the data signal; data signal measuring means for measuring the received power of the data signal; data signal predicting means for predicting the received power of the data signal based on the measured received power of the known signal; To the received power of the data signal predicted by the signal prediction means and the data signal measurement means.
- a power comparing means for comparing the measured received power of the data signal with the subcarrier for each subcarrier, and, based on the comparison result, a position where the fluctuation of the measured received data signal power with respect to the predicted received data signal power is large.
- a configuration including a collision position detecting means for detecting the position of a data symbol colliding between a plurality of cells by performing detection is adopted.
- the known signal measuring unit measures the reception power of the known signal that is not affected by interference due to collision between a plurality of cells based on the known signal that is arranged so as not to collide between the plurality of cells
- the data signal predicting means predicts the received power of the data signal when there is no collision based on the received power of the known signal.
- the power comparing means compares the received power of the actual data signal with the received power of the data signal when there is no collision for each subcarrier, and the collision position detecting means determines the data symbol position having a large variation (difference). Detected as As a result, it is possible to accurately detect the data symbol position where a collision occurs between a plurality of cells, that is, the subcarrier and the time point.
- the collision position detection means is configured such that the data signal reception power measured with respect to the predicted data signal reception power is higher than the first threshold in the plus direction.
- a configuration is adopted in which a collision is detected when the value is larger or when the value is smaller than the second threshold value in the negative direction.
- the collision when the phase between the colliding data symbols is similar, the collision is detected by the first threshold, and when the phases of the colliding data symbols are not similar, the collision is detected by the second threshold.
- the collision of the data symbols can be detected without any omission.
- One aspect of the OFDM receiving apparatus is an OFDM receiving apparatus that receives and demodulates an OFDM signal, comprising: a known signal measuring unit that measures received power of a known signal; Data signal measuring means for measuring power, and data signal prediction for predicting the received power of the data signal based on the measured received power of the known signal Means, means for comparing the received power of the data signal predicted by the data signal predicting means with the received power of the data signal measured by the data signal measuring means for each subcarrier, and the prediction based on the comparison result.
- Collision position detecting means for detecting a position of a data symbol colliding between a plurality of cells by detecting a position where the measured data signal received power fluctuates with respect to the measured data signal received power;
- a configuration is adopted in which the likelihood of the data symbol at the position where the collision is detected by the collision position detecting means is reduced, and error correction decoding means for performing error correction decoding processing is adopted.
- the known signal measuring means, the data signal measuring means, the data signal predicting means, the power comparing means, and the collision position detecting means determine the data symbol position (subcarrier, time ) Is detected accurately. Then, since the error correction decoding means performs the error correction processing by lowering the likelihood of the data symbol in which the collision is detected, it is possible to exclude the impulse noise due to the data symbol collision from the error correction processing. Therefore, the error rate characteristics of the decoded data can be improved.
- the collision position detecting means uses a threshold in detecting the position where the fluctuation is large, and is obtained by the error correction decoding means in addition to the above configuration.
- An error rate calculating means for calculating an error rate of the decoded data, and a threshold control means for changing a threshold value in the collision position detecting means according to the error rate calculation result are employed.
- the threshold control means adaptively changes the threshold according to the error rate calculation result, thereby detecting a data symbol in which a collision has occurred using the optimum threshold that provides the best error rate characteristics. become able to.
- the collision position detecting unit includes the fluctuation
- a threshold is used to detect a position having a large value of the received signal
- reception quality detection means for detecting the reception quality of the received OFDM signal
- threshold data associated with the reception quality are stored.
- a table for outputting threshold data corresponding to the detected reception quality to the collision position detecting means.
- the collision position detecting means is supplied with the optimum threshold value corresponding to the reception quality from the table means, so that the collision position detecting means can detect the collision position more accurately. The rate characteristics can be further improved.
- the collision position detecting means uses a threshold value to detect the position where the fluctuation is large, and further includes, in addition to the above-described configuration, decoded data obtained by the error correction decoding means.
- Error rate calculation means for calculating the error rate of the received signal
- reception quality detection means for detecting the reception quality of the received OFDM signal
- threshold control means for controlling the threshold value in the collision position detection means
- Table creation means for creating a reference table indicating the relationship with the error rate when the threshold value controlled by the threshold value control means is used, and the threshold value control means refers to the reference table and causes a collision.
- a configuration for setting an optimum threshold value in the position detecting means is adopted.
- the table creation unit updates and creates a reference table indicating the relationship between the threshold value and the error rate when the threshold value is used for each reception quality, and the threshold control unit updates the reference table as needed. Since the optimal threshold in the collision position detecting means is set with reference to the reference table thus obtained, a more accurate optimal threshold is set as the threshold used in the collision position detecting means. As a result, the error rate characteristics are further improved.
- the received power of a data signal which is predicted from the received power of a known signal, and the actual received power of a data signal are compared for each subcarrier and each burst period. If the received power of the signal fluctuates compared to the expected received power from the received power of the pilot signal, the data signal is considered to be in collision among multiple cells. Between cells It is possible to realize a collision position detection device that can accurately detect the position of a data signal that is colliding.
- the data symbol detected by the collision position detection device is notified to the error correction decoding unit, and the collision is detected by the collision position detection unit in the error correction decoding unit.
- the present invention is suitable for application to, for example, a mobile communication terminal.
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/542,772 US7626919B2 (en) | 2003-01-31 | 2004-01-21 | OFDM signal collision position detection apparatus and OFDM reception device |
CN2004800029131A CN1742452B (zh) | 2003-01-31 | 2004-01-21 | 正交频分多路复用信号冲突位置检测装置和正交频分多路复用接收装置 |
EP04703929A EP1583268A4 (en) | 2003-01-31 | 2004-01-21 | OFDM SIGNAL COLLISION POSITION DETECTION DEVICE AND OFDM RECEPTION DEVICE |
US12/573,812 US8000226B2 (en) | 2003-01-31 | 2009-10-05 | OFDM signal collision position detection apparatus and OFDM reception apparatus |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003-023747 | 2003-01-31 | ||
JP2003023747A JP4109556B2 (ja) | 2003-01-31 | 2003-01-31 | Ofdm信号の衝突位置検出装置、ofdm受信装置及びofdm信号の衝突位置検出方法及びofdm受信方法 |
Related Child Applications (3)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10542772 A-371-Of-International | 2004-01-21 | ||
US11/239,204 Continuation US7431868B2 (en) | 2003-03-31 | 2005-09-30 | Method of manufacturing a metal substrate for an oxide superconducting wire |
US12/573,812 Continuation US8000226B2 (en) | 2003-01-31 | 2009-10-05 | OFDM signal collision position detection apparatus and OFDM reception apparatus |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2004068757A1 true WO2004068757A1 (ja) | 2004-08-12 |
Family
ID=32820736
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2004/000458 WO2004068757A1 (ja) | 2003-01-31 | 2004-01-21 | Ofdm信号の衝突位置検出装置及びofdm受信装置 |
Country Status (5)
Country | Link |
---|---|
US (2) | US7626919B2 (ja) |
EP (1) | EP1583268A4 (ja) |
JP (1) | JP4109556B2 (ja) |
CN (1) | CN1742452B (ja) |
WO (1) | WO2004068757A1 (ja) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006069316A1 (en) * | 2004-12-22 | 2006-06-29 | Qualcomm Incorporated | Initial pilot frequency selection |
US8532605B2 (en) | 2007-08-09 | 2013-09-10 | Intel Mobile Communications GmbH | Determining a receiving quality in a radio communication device |
Families Citing this family (24)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1499083B1 (en) * | 2003-07-14 | 2012-01-11 | Samsung Electronics Co., Ltd. | TFI-OFDM transmission/reception systems for UWB communication and methods thereof for mitigating interference from simultaneously operating piconets |
KR100606049B1 (ko) * | 2004-08-27 | 2006-07-28 | 삼성전자주식회사 | 다중 셀 ofdma 망에서의 랜덤 접속 방법 |
JPWO2006043312A1 (ja) * | 2004-10-19 | 2008-05-22 | 松下電器産業株式会社 | 受信機及び衝突検知方法 |
US7986612B2 (en) * | 2005-08-22 | 2011-07-26 | Panasonic Corporation | Communication terminal apparatus, base station apparatus and reception quality reporting method |
JP4681649B2 (ja) * | 2005-08-25 | 2011-05-11 | エヌエックスピー ビー ヴィ | データストリーム信号の評価用rfidリーダ及び評価方法 |
JP2007144885A (ja) * | 2005-11-29 | 2007-06-14 | Seiko Epson Corp | 異物濃度の読み取り有無の判定方法、及び、テストパターンの濃度の代表値を算出する方法 |
US8315151B2 (en) * | 2006-01-18 | 2012-11-20 | St-Ericsson Sa | Radio communication system |
US8266482B2 (en) * | 2006-01-31 | 2012-09-11 | Arm Limited | Operating parameter control for integrated circuit signal paths |
US8000341B2 (en) * | 2006-03-08 | 2011-08-16 | Alcatel Lucent | Methods and systems for detecting collisions in access/utilization of resources of contention |
EP2642675B1 (en) * | 2006-03-20 | 2018-03-14 | Fujitsu Limited | Base station, mobile station, and MIMO-OFDM communication method thereof |
US7729315B2 (en) * | 2006-06-23 | 2010-06-01 | Telefonaktiebolaget L M Ericsson (Publ) | System and method of performing cell measurements in a telecommunications system |
JP5251000B2 (ja) * | 2006-11-01 | 2013-07-31 | 富士通株式会社 | 誤り訂正回路及び媒体記憶装置 |
JP4823165B2 (ja) * | 2007-08-07 | 2011-11-24 | 株式会社東芝 | Ofdm受信装置 |
JP5007676B2 (ja) * | 2008-01-31 | 2012-08-22 | 富士通株式会社 | 符号化装置、復号化装置、符号化・復号化装置及び記録再生装置 |
US7890062B2 (en) * | 2008-02-16 | 2011-02-15 | Agilent Technologies, Inc. | Fast correction of power measurements of signals having a changing frequency |
JP4567088B2 (ja) * | 2008-09-01 | 2010-10-20 | 三菱電機株式会社 | Ofdm信号受信装置および受信方法 |
JP2010109556A (ja) * | 2008-10-29 | 2010-05-13 | Ricoh Co Ltd | 無線受信装置及び隣接チャネル干渉検出方法 |
US8743823B2 (en) * | 2009-02-12 | 2014-06-03 | Qualcomm Incorporated | Transmission with collision detection and mitigation for wireless communication |
US8229369B2 (en) | 2009-05-01 | 2012-07-24 | Qualcomm Incorporated | Mitigating interference in a communication network |
JP5310774B2 (ja) * | 2011-04-18 | 2013-10-09 | 富士通株式会社 | 基地局、移動局及び通信方法 |
JP5773423B2 (ja) * | 2011-06-14 | 2015-09-02 | 日本電気通信システム株式会社 | 無線通信機、ネットワーク、無線通信方法およびプログラム |
US8855250B2 (en) * | 2011-10-03 | 2014-10-07 | Broadcom Corporation | Wireless communication system with improved automatic gain control |
US8948039B2 (en) * | 2012-12-11 | 2015-02-03 | Qualcomm Incorporated | Packet collisions and impulsive noise detection |
US20170280444A1 (en) * | 2016-03-24 | 2017-09-28 | Claudio Da Silva | Access point (ap), station (sta) and method for usage of a frame format based on a phase noise measurement |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH06343066A (ja) * | 1993-06-01 | 1994-12-13 | Nippon Telegr & Teleph Corp <Ntt> | スペクトラム拡散無線通信方式 |
JPH0964884A (ja) * | 1995-08-24 | 1997-03-07 | Toshiba Corp | 通信システム及びこれに用いる送信機、受信機 |
EP0854598A2 (en) | 1997-01-16 | 1998-07-22 | Ford Motor Company | Co-channel interference detector for a broadcast receiver |
JPH11289578A (ja) * | 1998-01-06 | 1999-10-19 | Lucent Technol Inc | 移動セルラ電気通信ネットワ―ク |
JPH11355178A (ja) * | 1998-06-05 | 1999-12-24 | Brother Ind Ltd | 周波数ホッピング方式を用いた無線通信装置 |
JP2001358694A (ja) * | 2000-04-18 | 2001-12-26 | Lucent Technol Inc | 直交周波数分割多重(ofdm)方式に基づくスペクトラム拡散多元接続ワイヤレスシステムにおける移動ユーザユニットで用いられる装置 |
JP2001358695A (ja) * | 2000-04-18 | 2001-12-26 | Lucent Technol Inc | 直交周波数分割多重ベースのスペクトル拡散多重アクセスシステムにおけるパイロット使用 |
JP2003535556A (ja) * | 2000-05-30 | 2003-11-25 | コリア アドバンスト インスティテュート オブ サイエンス アンド テクノロジ− | 多次元直交リソースホッピング多重通信方法及び装置 |
Family Cites Families (22)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US191569A (en) * | 1877-06-05 | Improvement in ripping-tools | ||
JP3130752B2 (ja) * | 1995-02-24 | 2001-01-31 | 株式会社東芝 | Ofdm伝送受信方式及び送受信装置 |
US5726978A (en) * | 1995-06-22 | 1998-03-10 | Telefonaktiebolaget L M Ericsson Publ. | Adaptive channel allocation in a frequency division multiplexed system |
KR100234329B1 (ko) * | 1997-09-30 | 1999-12-15 | 윤종용 | Ofdm 시스템 수신기의 fft 윈도우 위치 복원장치 및 그 방법_ |
EP0929202A1 (en) | 1998-01-06 | 1999-07-14 | Lucent Technologies Inc. | Uplink channel allocation for a mobile cellular network |
JP3722969B2 (ja) * | 1998-01-08 | 2005-11-30 | 株式会社東芝 | 再送制御方法及び再送制御装置 |
JP3363086B2 (ja) | 1998-03-04 | 2003-01-07 | 株式会社東芝 | Ofdm受信装置 |
US6735423B1 (en) * | 1999-05-18 | 2004-05-11 | General Instrument Corporation | Method and apparatus for obtaining optimal performance in a receiver |
US6795426B1 (en) * | 1999-07-06 | 2004-09-21 | Cisco Technology, Inc. | Realtime power control in OFDM systems |
KR100755038B1 (ko) * | 1999-08-05 | 2007-09-06 | 한국전자통신연구원 | 직교 부호 도약 다중화 통신 방식 및 장치 |
DE60038866D1 (de) * | 1999-09-29 | 2008-06-26 | Samsung Electronics Co Ltd | System und verfahren zur kompensation von zeitfehlm/cdma kommunikationssystem |
US6628735B1 (en) * | 1999-12-22 | 2003-09-30 | Thomson Licensing S.A. | Correction of a sampling frequency offset in an orthogonal frequency division multiplexing system |
JP4337228B2 (ja) * | 2000-04-13 | 2009-09-30 | ソニー株式会社 | Ofdm受信装置及び方法 |
JP4356203B2 (ja) * | 2000-07-11 | 2009-11-04 | ソニー株式会社 | 復調装置及び復調方法 |
EP1176750A1 (en) * | 2000-07-25 | 2002-01-30 | Telefonaktiebolaget L M Ericsson (Publ) | Link quality determination of a transmission link in an OFDM transmission system |
US7002934B2 (en) * | 2001-01-22 | 2006-02-21 | Unique Broadband Systems, Inc. | OFDM multiple upstream receiver network |
KR100434473B1 (ko) * | 2001-05-11 | 2004-06-05 | 삼성전자주식회사 | 직교주파수 분할 다중 시스템에서 채널 복호 장치 및 방법 |
JP3607643B2 (ja) * | 2001-07-13 | 2005-01-05 | 松下電器産業株式会社 | マルチキャリア送信装置、マルチキャリア受信装置、およびマルチキャリア無線通信方法 |
JP3782330B2 (ja) * | 2001-09-14 | 2006-06-07 | 富士通株式会社 | Ofdm受信方法及びofdm受信装置 |
US7280504B2 (en) * | 2001-09-28 | 2007-10-09 | Kabushiki Kaisha Toshiba | OFDM transmitting and receiving apparatus |
JP3860762B2 (ja) * | 2002-02-14 | 2006-12-20 | 株式会社エヌ・ティ・ティ・ドコモ | 移動通信システム、チャネル同期確立方法、及び移動局 |
US6904550B2 (en) * | 2002-12-30 | 2005-06-07 | Motorola, Inc. | Velocity enhancement for OFDM systems |
-
2003
- 2003-01-31 JP JP2003023747A patent/JP4109556B2/ja not_active Expired - Fee Related
-
2004
- 2004-01-21 CN CN2004800029131A patent/CN1742452B/zh not_active Expired - Fee Related
- 2004-01-21 WO PCT/JP2004/000458 patent/WO2004068757A1/ja active Application Filing
- 2004-01-21 US US10/542,772 patent/US7626919B2/en not_active Expired - Fee Related
- 2004-01-21 EP EP04703929A patent/EP1583268A4/en not_active Withdrawn
-
2009
- 2009-10-05 US US12/573,812 patent/US8000226B2/en not_active Expired - Fee Related
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH06343066A (ja) * | 1993-06-01 | 1994-12-13 | Nippon Telegr & Teleph Corp <Ntt> | スペクトラム拡散無線通信方式 |
JPH0964884A (ja) * | 1995-08-24 | 1997-03-07 | Toshiba Corp | 通信システム及びこれに用いる送信機、受信機 |
EP0854598A2 (en) | 1997-01-16 | 1998-07-22 | Ford Motor Company | Co-channel interference detector for a broadcast receiver |
JPH11289578A (ja) * | 1998-01-06 | 1999-10-19 | Lucent Technol Inc | 移動セルラ電気通信ネットワ―ク |
JPH11355178A (ja) * | 1998-06-05 | 1999-12-24 | Brother Ind Ltd | 周波数ホッピング方式を用いた無線通信装置 |
JP2001358694A (ja) * | 2000-04-18 | 2001-12-26 | Lucent Technol Inc | 直交周波数分割多重(ofdm)方式に基づくスペクトラム拡散多元接続ワイヤレスシステムにおける移動ユーザユニットで用いられる装置 |
JP2001358695A (ja) * | 2000-04-18 | 2001-12-26 | Lucent Technol Inc | 直交周波数分割多重ベースのスペクトル拡散多重アクセスシステムにおけるパイロット使用 |
JP2003535556A (ja) * | 2000-05-30 | 2003-11-25 | コリア アドバンスト インスティテュート オブ サイエンス アンド テクノロジ− | 多次元直交リソースホッピング多重通信方法及び装置 |
Non-Patent Citations (2)
Title |
---|
See also references of EP1583268A4 |
SHINOI K-I ET AL., AN INTERFERENCE IMMUNITY DECODING METHOD FOR MULTICARRIER TRELLIS-CODED SFH/16QAM |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006069316A1 (en) * | 2004-12-22 | 2006-06-29 | Qualcomm Incorporated | Initial pilot frequency selection |
US8009551B2 (en) | 2004-12-22 | 2011-08-30 | Qualcomm Incorporated | Initial pilot frequency selection |
US8532605B2 (en) | 2007-08-09 | 2013-09-10 | Intel Mobile Communications GmbH | Determining a receiving quality in a radio communication device |
US9380470B2 (en) | 2007-08-09 | 2016-06-28 | Intel Deutschland Gmbh | Determining a receiving quality in a radio communication device |
Also Published As
Publication number | Publication date |
---|---|
CN1742452A (zh) | 2006-03-01 |
US7626919B2 (en) | 2009-12-01 |
CN1742452B (zh) | 2010-04-28 |
US8000226B2 (en) | 2011-08-16 |
US20060072450A1 (en) | 2006-04-06 |
JP4109556B2 (ja) | 2008-07-02 |
EP1583268A1 (en) | 2005-10-05 |
EP1583268A4 (en) | 2011-05-11 |
JP2004266336A (ja) | 2004-09-24 |
US20100023836A1 (en) | 2010-01-28 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP4109556B2 (ja) | Ofdm信号の衝突位置検出装置、ofdm受信装置及びofdm信号の衝突位置検出方法及びofdm受信方法 | |
CA2796382C (en) | Method of generating pilot pattern for adaptive channel estimation in ofdma systems, method of transmitting/receiving using the pilot pattern and apparatus thereof | |
US7453861B2 (en) | System and method for estimating interference in a packet-based wireless network | |
US8213527B2 (en) | Channel variation detection of wireless channel for adaptive transmission schemes | |
TWI462506B (zh) | 具有功率控制指令及抹除指示之功率控制與遞交 | |
US7333566B2 (en) | Radio reception apparatus, radio reception method and radio reception program capable of switching modulation methods | |
US8588098B2 (en) | Transmission apparatus, reception apparatus, communication system, and processing method used in reception apparatus | |
US9444575B2 (en) | Wireless communication system, receiver, transmitter, and transmission rate control method | |
JP4860211B2 (ja) | 無線通信システム、基地局 | |
JP4280233B2 (ja) | 無線通信システム、無線通信装置、及びこの無線通信装置のガードインターバル長の変更方法 | |
US20120252513A1 (en) | Radio base station | |
JP2010074365A (ja) | 無線通信装置 | |
JP3481542B2 (ja) | 無線通信システムにおける誤り訂正用送信回路ならびに受信回路 | |
US20050069060A1 (en) | Data receiving apparatus and data receiving method | |
US11159198B2 (en) | Radio communication apparatus, radio communication system, radio communication method, and program | |
US8259880B2 (en) | Receivers and methods for controlling operation of receivers | |
JP2002016532A (ja) | 移動無線端末 | |
JP2006165697A (ja) | 無線通信システムおよび受信装置 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BW BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE EG ES FI GB GD GE GH GM HR HU ID IL IN IS KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NA NI NO NZ OM PG PH PL PT RO RU SC SD SE SG SK SL SY TJ TM TN TR TT TZ UA UG US UZ VC VN YU ZA ZM ZW |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): BW GH GM KE LS MW MZ SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LU MC NL PT RO SE SI SK TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG |
|
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: 2004703929 Country of ref document: EP |
|
ENP | Entry into the national phase |
Ref document number: 2006072450 Country of ref document: US Kind code of ref document: A1 |
|
WWE | Wipo information: entry into national phase |
Ref document number: 10542772 Country of ref document: US |
|
WWE | Wipo information: entry into national phase |
Ref document number: 20048029131 Country of ref document: CN |
|
WWE | Wipo information: entry into national phase |
Ref document number: 11239204 Country of ref document: US |
|
WWP | Wipo information: published in national office |
Ref document number: 2004703929 Country of ref document: EP |
|
WWP | Wipo information: published in national office |
Ref document number: 11239204 Country of ref document: US |
|
WWP | Wipo information: published in national office |
Ref document number: 10542772 Country of ref document: US |