WO2001054329A1 - Appareil et procede de suppression des signaux d'interference - Google Patents
Appareil et procede de suppression des signaux d'interference Download PDFInfo
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- WO2001054329A1 WO2001054329A1 PCT/JP2001/000064 JP0100064W WO0154329A1 WO 2001054329 A1 WO2001054329 A1 WO 2001054329A1 JP 0100064 W JP0100064 W JP 0100064W WO 0154329 A1 WO0154329 A1 WO 0154329A1
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- symbol rate
- correlation value
- interference signal
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- 238000000034 method Methods 0.000 title claims description 17
- 238000003379 elimination reaction Methods 0.000 claims description 63
- 230000008030 elimination Effects 0.000 claims description 61
- 238000012545 processing Methods 0.000 claims description 19
- 230000010076 replication Effects 0.000 claims description 5
- 238000012935 Averaging Methods 0.000 claims description 2
- 238000009792 diffusion process Methods 0.000 abstract description 2
- 238000004891 communication Methods 0.000 description 33
- 238000010586 diagram Methods 0.000 description 21
- 108010003272 Hyaluronate lyase Proteins 0.000 description 15
- 230000005540 biological transmission Effects 0.000 description 6
- 238000010295 mobile communication Methods 0.000 description 3
- 230000002194 synthesizing effect Effects 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
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- 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
- H04B1/707—Spread spectrum techniques using direct sequence modulation
- H04B1/7097—Interference-related aspects
- H04B1/7103—Interference-related aspects the interference being multiple access interference
- H04B1/7107—Subtractive interference cancellation
- H04B1/71075—Parallel interference cancellation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B2201/00—Indexing scheme relating to details of transmission systems not covered by a single group of H04B3/00 - H04B13/00
- H04B2201/69—Orthogonal indexing scheme relating to spread spectrum techniques in general
- H04B2201/707—Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation
- H04B2201/70703—Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation using multiple or variable rates
Definitions
- the present invention relates to an interference signal elimination device and an interference signal elimination method used in a CDMA (Code Division Multiple Access) type mobile communication system.
- CDMA Code Division Multiple Access
- signals from a plurality of users are transmitted in the same band, so that the signals received by the receiving device are subject to interference by various signals, resulting in deterioration of characteristics.
- devices that remove interference signals include: 1) Sawabashi, Miki, Ando, Higuchi, "Sequential channel estimation type serial canceller using pilot symbols in DS-CDMA (Technical report of the Institute of Electronics, Information and Communication Engineers, Radio Communication Systems Research Group) , RCS 95-50, July 1995) ", 2) Yoshida and Gogawa" CDMA multi-stage interference canceller with successive channel estimation using symbol repli- cation processing (The Institute of Electronics, Information and Communication Engineers, radio communication system) Technical report of the workshop, RC S 96-171, February 1999), "3) Uesugi, Kato, Honma” Study on CDMA interference canceller in uplink (IEICE, Wireless Communication System) Technical Report, RC S96-121, January 1997).
- the above three devices are referred
- Each of the above three devices generates a replica signal of the received signal, and removes the interference signal from the received signal by subtracting the replica signal from the received signal. Things.
- the above three devices generate a replica signal by despreading the received signal, making a temporary decision, and re-spreading the result of the temporary decision. Since the generation of the replica signal requires respreading processing, the repli- cation signal cannot be generated unless the symbol rate or spreading factor of the received signal is known.
- the spreading factor changes according to the change in the symbol rate.
- the repli- cation signal of the frame cannot be generated unless the signal for one frame is demodulated.
- the above-described conventional interference signal elimination device uses the control channel signal having a fixed symbol rate as shown in FIG.
- the symbol rate of the data channel signal cannot be determined until TFCI (Transport Format Combination Indicator: transmission frame information) is received for 15 slots (one frame).
- TFCI Transport Format Combination Indicator: transmission frame information
- the above-described conventional interference signal elimination device cannot determine the spreading factor of the data channel signal until the TFC I of the control channel signal is received for 15 slots. That is, the above-described conventional interference signal elimination device cannot generate the repli- cation force signal until the control channel signal TFC I is received for 15 slots. Therefore, in the above-described conventional interference signal elimination device, there is a problem that a delay until a replica signal is generated is at least one frame, and a delay time is extremely long. Disclosure of the invention
- An object of the present invention is to provide an interference signal elimination apparatus and an interference signal elimination method that can reduce a delay until a replica signal is generated, and thereby improve the reception performance of a wireless reception apparatus. .
- the present inventors have proposed that a received signal of a specific symbol rate be a candidate signal.
- the present inventors have found that it is possible to determine the symbol rate of a received signal by determining the despread result (correlation value) per symbol for each sample rate and comparing the despread results, and have accomplished the present invention.
- a replica signal is generated by performing re-spreading processing with a spreading code corresponding to a symbol rate determined before receiving a signal for one frame, and The delay before a replica signal is generated has been reduced.
- FIG. 1 is a schematic diagram showing a slot configuration of a data channel and a control channel.
- FIG. 2 is a main block diagram showing a schematic configuration of the interference signal removing apparatus according to Embodiment 1 of the present invention.
- FIG. 3 is a main part block diagram showing a schematic configuration of the ICU of the first stage and the second stage of the interference signal elimination device according to Embodiment 1 of the present invention.
- FIG. 4 is a main part block diagram showing a schematic configuration of the ICU of the third stage of the interference signal elimination device according to Embodiment 1 of the present invention.
- FIG. 5A is a schematic diagram showing a relationship between a received signal input to the interference signal canceling apparatus according to Embodiment 1 of the present invention and a spread code spreading the received signal.
- FIG. 5B is a schematic diagram showing a relationship between a received signal input to the interference signal canceling apparatus according to Embodiment 1 of the present invention and a spread code spreading the received signal.
- FIG. 5C is a schematic diagram showing a relationship between a received signal input to the interference signal removing apparatus according to Embodiment 1 of the present invention and a spread code spreading the received signal.
- FIG. 5D is a schematic diagram showing a relationship between a received signal input to the interference signal canceling apparatus according to Embodiment 1 of the present invention and a spread code spreading the received signal.
- FIG. 5A is a schematic diagram showing a relationship between a received signal input to the interference signal canceling apparatus according to Embodiment 1 of the present invention and a spread code spreading the received signal.
- FIG. 5B is a schematic diagram
- FIG. 6 is a main block diagram showing a schematic configuration of a data channel correlation value calculation unit of the interference signal elimination device according to Embodiment 1 of the present invention.
- FIG. 7 is a main block diagram showing a schematic configuration of a data channel correlation value calculation unit of the interference signal elimination device according to Embodiment 2 of the present invention.
- FIG. 8 is a main block diagram showing a schematic configuration of the ICU of the first stage and the second stage of the interference signal elimination device according to Embodiment 3 of the present invention.
- FIG. 9 is a main block diagram showing a schematic configuration of a data channel correlation value calculation unit of the interference signal elimination device according to Embodiment 3 of the present invention.
- FIG. 2 is a main block diagram showing a schematic configuration of the interference signal removing apparatus according to Embodiment 1 of the present invention.
- the number of stages (the number of stages) of the interference signal canceller is 3, the number of communication partners is 3, and the number of multipaths is 3 will be described.
- the above numbers are merely examples, and the present invention is not limited to these numbers.
- a received signal is transmitted via an antenna 101 to an ICU (Interference Canceling Unit) 102— :! To 3 and the delay device 103.
- the delay device 103 converts the received signal into ICU 102— ;! Output to the adder 104 with a delay of the processing time of ⁇ 3.
- ICU 10 2— ;! To 3 are provided corresponding to the communication partners 1 to 3, respectively, and generate a replica signal corresponding to each communication partner.
- the configuration of ICU 102-1-3 will be described in detail later.
- ICU 1 0 2— :! The replica signals generated by (1) to (3) are input to adders 104 and input to adders 105 to 1-3, respectively.
- the replica signals of the communication partners 1 to 3 are subtracted from the received signal.
- all the replica signals of the communication partner are removed from the received signal.
- a signal (residual signal) obtained by removing all replica signals from the received signal from the received signal is added to the adder 105- :! To 3 and to the second stage delay device 103.
- the adder 105-1 adds the replica signal of the communication partner 1 and the residual signal. As a result, the replica signal of the communication partner 2 and the replica signal of the communication partner 3 are removed from the received signal. That is, the signal of the communication partner 2 and the signal of the communication partner 3 which interfere with the communication partner 1 are removed from the received signal, and the desired signal of the communication partner 1 is obtained.
- the adders 105-5 and 105-3 by performing the same processing as described above, the signal of the other communication partner causing interference is removed from the received signal, and the desired signal of the communication partner 2 is removed.
- the desired signals for the signal and the communication partner 3 are obtained, respectively.
- the desired signal obtained is the second stage ICU 102-;! To 3 respectively.
- the interference signal elimination device of the present invention improves the accuracy of the replica signal and the interference signal elimination accuracy by repeating the same processing performed in the first stage in the second stage. In other words, as the number of stages is increased, the more the interference signal given from the other communication partner is removed for each communication partner.
- the signals added by the second stage adders 105-1 to 3 are input to the third stage ICU 106 _:! To 3 and demodulated. As a result, demodulated signals 1 to 3 of communication partners 1 to 3 are obtained.
- the configuration of ICU106-6 to 1-3 will be described later in detail.
- FIG. 3 is a main part block diagram showing a schematic configuration of a first stage and a second stage ICU of the interference signal elimination device according to the first embodiment of the present invention.
- FIG. 4 is a circuit diagram showing the third stage I of the interference signal elimination apparatus according to Embodiment 1 of the present invention.
- FIG. 2 is a main block diagram showing a schematic configuration of a CU.
- the first stage and the second stage ICU 102-1 to 3 all have the same configuration and operation.
- the third stage ICU 106—1 to 3 all have the same configuration and operation.
- the ICU 102-1 shown in FIG. 3 and the ICU 106-1 shown in FIG. 4 are configured on the assumption that the number of multipaths to the radio receiving apparatus is 3, and in FIG. 3 and FIG. , The components for each path are indicated as P1 to P3, respectively. Since each component for each path has the same configuration and operation, only the P1 for the first path will be described, and the description of the P2 for the second path and the P3 for the third path will be omitted. .
- the ICU 102-1 is roughly divided into a pre-stage S l for performing despreading on the received signal, a middle-stage S 2 for performing rake combining and tentative judgment, and It consists of the subsequent stage S3 to generate.
- the received signal is input to the data channel correlation value calculation unit 201 and the control channel despreading unit 202 via the antenna 101.
- the data channel correlation value calculation unit 201 performs despreading processing on the data channel signal among the received signals, and determines the symbol rate of the data channel signal.
- the data channel correlation value calculator 201 outputs the despread result to the multiplier 204 and notifies the re-spreader 208 of the determined symbol rate.
- the configuration of the correlation channel calculation unit 201 for the overnight channel will be described later in detail.
- control channel despreading section 202 performs despreading processing on the control channel signal among the received signals, and outputs the result of despreading to channel estimation section 203.
- Channel estimating section 203 performs channel estimation based on the result of despreading, outputs the complex conjugate of the channel estimation value to multiplier 204, and outputs the channel estimation value to multiplier 207.
- multiplier 204 the The despread result is multiplied by the complex conjugate of the channel estimate. Thereby, the phase rotation of the data channel signal is compensated.
- the despread result of each of the paths P1 to P3 multiplied by the complex conjugate of the channel estimation value is RAKE-combined by the adder 205 of the middle stage S2.
- the result of the RAKE combination is provisionally determined by the determiner 206.
- the signal after the tentative determination is multiplied by the channel estimation value by the multiplier 207 for each of the paths P1 to P3 in the subsequent stage S3, and is input to the respreading unit 208.
- the re-spreading unit 208 re-spreads the signal output from the multiplier 207 with a spreading code corresponding to the symbol rate determined by the overnight channel correlation value calculating unit 201.
- the signals respread for each of the paths P1 to P3 are added by an adder 209. Thereby, a replica signal for communication partner 1 is obtained.
- the third stage ICU 106-1 will be described.
- the ICU 106-1 in the third stage has substantially the same configuration as the preceding stage S1 and the middle stage S2 of the ICU 102-1 shown in FIG. Therefore, the same components as those of ICU 102-1 shown in FIG. 3 are denoted by the same reference numerals, and description of ICU 106-1 in the third stage is omitted.
- ICU106-1 is different from ICU102-1 in that data channel correlation value calculation section 301 does not report the symbol rate to the subsequent stage. This is because, in the third stage, the demodulated signal 1 is output instead of the replica signal, so that no re-spreading processing is required. Therefore, the symbol rate required for the re-spreading processing is not required.
- FIGS. 5A to 5D are schematic diagrams showing a relationship between a received signal input to the interference signal canceling apparatus according to Embodiment 1 of the present invention and a spread code spreading the received signal.
- FIG. 6 is a main block diagram showing a schematic configuration of the data channel correlation value calculation unit of the interference signal removal apparatus according to Embodiment 1 of the present invention.
- the interference signal canceller now has four symbol rate received signals, that is, four spreading rates, eight times, sixteen times, and thirty-two times spreading. It is assumed that there is a possibility that the received signal is input.
- the spreading code of each spreading factor is a spreading code in which the spreading code with the lowest spreading factor (that is, the highest symbol rate) of the four is repeated. It is assumed that In other words, assuming that the spreading code of quadruple spreading is "0101", the spreading code of eightfold spreading is the same as the spreading code of quadrupling spreading twice "0101101" Become. Similarly, a spread code of 16 times spread is a spread code obtained by repeating a quadruple spread code four times, and a spread code of 2 times spread is a spread code obtained by repeating a quadruple spread code eight times. Become one.
- the despreading unit 501 for the data channel has a spreading code with the lowest spreading factor among the spreading factors that may be used, that is, a quadruple spreading code. With the spreading code "001”, despreading is performed on the received signal corresponding to the length of one symbol in quadruple spreading.
- the 8x spreading code is a spreading code obtained by repeating the 4x spreading code twice, so the received signal for one symbol of 8x spreading is Equivalent to two signals combined. Therefore, by combining the result of despreading with the quadruple spreading code for two symbols, the result of despreading for one symbol of the signal spread with the eightfold spreading code is obtained. Similarly, by combining the result of despreading with the quadruple spreading code for four symbols, the despread result of one symbol of the signal spread with the 16-fold spreading code is obtained. By combining the result of despreading with the double spreading code for eight symbols, the result of despreading one symbol of the signal spread with the 32 times spreading code can be obtained. In other words, if there is a received signal equivalent to the length of one symbol of quadruple spreading, one system of the received signal spread by four spreading factors is used. It is possible to obtain the inverse diffusion results for the symbols.
- the de-spreading channel demultiplexing section 501 despreads the received signal with a quadruple spreading code "001" to form a two-symbol synthesizing section 502, 4 symbol synthesizing section. Output to the 503 and 8-symbol combining section 504, respectively.
- the despreading unit 501 for the overnight channel outputs the result of despreading the received signal with the spreading code "0101" of quadruple spreading to the determination unit 505 and the selector 506 as it is. I do.
- the two-symbol combining unit 502 combines the result of despreading with the quadruple spreading code for two symbols to generate a result despread with the eight-fold spreading code.
- the 4-symbol combining section 503 generates a result of despreading with a 16-fold spreading code by combining the result of despreading with a 4-fold spreading code for four symbols.
- the eight-symbol combining unit 504 combines the result of despreading with the four-fold spreading code by eight symbols to generate a result of despreading with the 32-fold spreading code.
- the combined despread result is output to determination section 505 and selector 506, respectively.
- the determination section 505 compares the four despread results (that is, four correlation values) output from the data channel despreading section 501 and each of the combining sections 502 to 504.
- the correlation value obtained by the de-spreading unit 501 for the data channel becomes the maximum among the four correlation values.
- the correlation value obtained by the two-symbol combining unit 502 was spread by the 16-fold spreading code.
- the correlation value obtained by the four-symbol combining unit 503 is used. If the received signal is spread by a 32 ⁇ spreading code, the correlation value obtained by the eight-symbol combining unit 504 is used. Value is equal to 4 correlation values The largest.
- determination section 505 determines the symbol rate of the received signal by determining the largest correlation value among the four correlation values. Specifically, for example, if the correlation value obtained by the two-symbol combining unit 502 is the largest of the four correlation values, the determining unit 505 sets the symbol rate of the received signal to Judge as the second highest symbol rate among the candidate symbol rates. Then, determination section 505 outputs a signal indicating the symbol rate of the received signal as a determination result to respreading section 208 and selector 506.
- the re-spreading unit 208 performs a re-spreading process using a spreading code corresponding to the symbol rate determined by the determining unit 505, and generates a replica signal.
- the selector 506 selects a correlation value corresponding to the determined symbol rate, that is, a maximum correlation value among the four correlation values, and outputs the selected correlation value to the multiplier 204.
- the TFCI of the control channel signal is determined for 15 slots.
- a replica signal cannot be generated until it is received. For this reason, in the above conventional interference signal removal apparatus, the delay until the replica signal is generated is at least one frame, and the delay time is very long. This causes a decrease in performance of the radio receiver.
- the interference signal elimination device of the present invention does not require a control channel signal for 15 slots, and a data channel for one symbol corresponding to the highest symbol rate among possible symbol rates. If there is a signal, the symbol rate of the received signal can be determined. That is, the interference signal elimination device of the present invention can generate a replica signal if there is a data channel signal for one symbol corresponding to the highest symbol rate among the symbol rates that may be used. Therefore, the interference signal elimination apparatus of the present invention is different from the above-described conventional interference signal elimination apparatus in that the replica signal is input after the reception signal is input. The delay time until a signal is generated can be greatly reduced.
- the interference signal elimination device when one frame is composed of 15 slots, the symbol rate cannot be determined until 15 slots have been received by a conventional interference signal canceller.
- the symbol rate can be determined within the first slot of the frame. Therefore, the delay time is reduced to at least 15 times lower than before. Furthermore, the time required for the interference signal elimination processing is also significantly reduced by greatly reducing the above-mentioned delay time, so that the reception performance is dramatically improved as compared with the conventional case.
- the interference signal elimination device of the present invention does not require the TFCI of the control channel signal when determining the symbol rate. Therefore, it is not necessary to add TFCI to the control channel signal, so that the transmission efficiency of the control channel signal can be improved.
- the third stage data channel correlation value calculation unit 301 has the same configuration as the first and second stages except that the determination unit 505 does not output the determination result to the respreading unit 208. Since the configuration and operation are the same as those of the data channel correlation value calculation unit 201, the description is omitted.
- the determination unit 505 outputs a signal indicating the symbol rate as a determination result.
- the determination unit 505 determines the spreading factor of the received signal, and determines the spreading factor as a determination result.
- the configuration may be such that the indicated signal is output to the re-spreading unit 208.
- respreading section 208 performs respreading processing using a spreading code corresponding to the determined spreading factor.
- the spreading code of each spreading factor is a repetition of the spreading code of the lowest spreading factor (that is, the highest symbol rate).
- the interference signal elimination device of the present embodiment can reduce the symbol level of the received signal. Can be determined You. In this case, the interference signal elimination device of the present embodiment despreads the received signal with each of the known spreading codes corresponding to each symbol rate, and then determines the spreading code with the maximum correlation value, thereby determining the received signal. The symbol rate can be determined.
- the re-spreading process is performed using the spreading code corresponding to the symbol determined before receiving the signal for one frame. Since a replica signal is generated by performing the process, a delay time until the replica signal is generated can be greatly reduced. (Embodiment 2)
- the interference signal elimination device and the interference signal elimination method according to Embodiment 2 of the present invention determine the symbol rate of the received signal by comparing the average value of the correlation value in a predetermined section.
- FIG. 7 is a main block diagram showing a schematic configuration of a data channel correlation value calculation unit of the interference signal elimination device according to Embodiment 2 of the present invention. Note that the same components as those of the overnight channel correlation value calculation unit according to Embodiment 1 are denoted by the same reference numerals, and detailed description thereof will be omitted.
- averaging sections 601 to 604 respectively take the correlation values output from despread channel despreading section 501 and synthesis sections 502 to 504 for a predetermined interval. (For example, in one slot section).
- the determination section 505 compares each correlation value according to the average value in a predetermined section to determine a symbol rate.
- the symbol rate of the received signal is determined by comparing the average value of the correlation value in a predetermined section. Therefore, the accuracy of the correlation value can be improved. Therefore, the accuracy of symbol rate determination can be improved. (Embodiment 3)
- the interference signal elimination device and the interference signal elimination method according to the third embodiment of the present invention are characterized in that the symbol rate of the data channel signal is determined according to the correlation value of the data channel signal that has reached a threshold value determined from the correlation value of the control channel signal. Is determined.
- FIG. 8 is a main block diagram showing a schematic configuration of the ICU of the first stage and the second stage of the interference signal elimination device according to Embodiment 3 of the present invention.
- FIG. 9 is a main block diagram showing a schematic configuration of a data channel correlation value calculation unit of the interference signal elimination device according to Embodiment 3 of the present invention. Note that the same components as those of the ICU and data channel correlation value calculation unit according to Embodiment 1 are denoted by the same reference numerals, and detailed description thereof will be omitted.
- a received signal is input to a data channel correlation value calculation unit 701 via an antenna 101, and a despread result (correlation) obtained by a control channel despreading unit 202 is obtained. Value) is entered.
- the correlation value obtained by the control channel despreading unit 202 is input to the threshold value calculation unit 801 as shown in FIG. Since the ratio of the transmission power value of the data channel signal to the transmission power value of the control channel signal is known in advance, the correlation value of the data channel signal can be predicted from the correlation value of the control channel signal. Therefore, the threshold value calculation section 8001 calculates a predicted correlation value of the data channel signal from the correlation value of the control channel signal according to a preset ratio of the transmission power value, and sets the predicted correlation value to a threshold value. And outputs it to the judgment unit 802.
- the decision unit 8002 is the largest of the four correlation values obtained by the despread channel despreading unit 501 and each of the combining units 502 to 504, and the threshold value (The symbol rate of the received signal is determined by determining the correlation value that has reached (predicted correlation value). Therefore, even if the maximum correlation value among the four correlation values is smaller than the threshold value, the correlation value is excluded from the determination target. That is, the determination unit 8002 determines that the maximum correlation value is smaller than the threshold value. In this case, the symbol rate of the received signal is not determined. That is, if the reliability of the data channel signal is low, the symbol rate is not determined.
- the re-spreading unit 208 cannot perform the re-spreading process, so that no replica signal is created. In this way, the present embodiment eliminates the possibility that an erroneous replica signal is generated according to a low-reliability received signal.
- the predicted correlation value itself is used as the threshold, but a value obtained by multiplying the predicted correlation value by a predetermined value may be used as the threshold.
- the interference signal elimination apparatus and the interference signal elimination method according to the present embodiment according to the correlation value of the data channel signal that has reached the threshold value obtained from the correlation value of the control channel signal, the symbol of the data channel signal is Since the rate is determined, the possibility that an erroneous replica signal is generated can be eliminated. Therefore, according to the interference signal elimination device and the interference signal elimination method according to the present embodiment, since the interference signal elimination process due to the erroneous replica signal is not performed, the accuracy of the interference signal elimination process can be improved. .
- Embodiments 1 to 3 a wireless communication system in which a control channel is used separately from a data channel has been described as an example.
- the present invention is not limited to this, and the wireless communication system in which control data is inserted into user data in one channel for communication is also used. Can be applied.
- the parallel interference signal elimination device has been described as an example.
- the present invention can be applied to any interference signal removing apparatus that generates a replica signal by respreading processing. That is, the present invention is also applicable to a serial type interference signal elimination device and a symbol ranking type interference signal elimination device.
- the present invention is applied to a symbol ranking interference signal elimination apparatus, the likelihood calculation for each symbol is performed for each block having the block length of the symbol having the highest symbol rate at the communication partner.
- the symbol ranking type interference signal elimination apparatus can calculate the likelihood even if the symbol rate is unknown, so that the ranking processing can be performed before receiving one frame.
- the symbol ranking interference signal elimination device can generate a replica signal before receiving one frame, the delay time until the generation of the replica signal can be greatly reduced.
- the present invention can be applied to a mobile station device and a base station device used in a mobile communication system. When applied, the delay time until a replica signal is generated in a mobile station device or a base station device can be greatly reduced, and the reception performance of the mobile station device or the base station device can be improved. .
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US09/936,731 US20030067967A1 (en) | 2000-01-18 | 2001-01-10 | Interference signal apparatus and interference signal canceling method |
EP01900642A EP1161012A4 (en) | 2000-01-18 | 2001-01-10 | APPARATUS AND METHOD FOR DELETING INTERFERENCE SIGNALS |
AU25474/01A AU2547401A (en) | 2000-01-18 | 2001-01-10 | Interference signal eliminating apparatus and method of eliminating interferencesignal |
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JP2000/9268 | 2000-01-18 | ||
JP2000009268A JP2001203668A (ja) | 2000-01-18 | 2000-01-18 | 干渉信号除去装置および干渉信号除去方法 |
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JP3424748B2 (ja) * | 2000-05-25 | 2003-07-07 | 日本電気株式会社 | Cdma受信装置およびレート整合処理方法 |
KR100981507B1 (ko) | 2003-04-14 | 2010-09-10 | 삼성전자주식회사 | 블록 확산 코드분할 다중접속 이동통신 시스템에서 트래픽 발생 및 수신 장치 및 방법 |
JP4182345B2 (ja) | 2003-06-26 | 2008-11-19 | 日本電気株式会社 | 干渉キャンセルユニット及びマルチユーザ干渉キャンセラ |
US7310367B2 (en) * | 2003-10-17 | 2007-12-18 | Qualcomm Incorporated | Data demodulation for a CDMA communication system |
US8741322B2 (en) * | 2004-06-28 | 2014-06-03 | L'oreal | Water oil-in-water emulsion |
US7561615B2 (en) * | 2005-03-18 | 2009-07-14 | Interdigital Technology Corporation | Method and apparatus for compensating for phase noise of symbols spread with a long spreading code |
JP2007208563A (ja) * | 2006-01-31 | 2007-08-16 | Anritsu Corp | 移動体端末試験装置 |
CN103905072B (zh) * | 2012-12-27 | 2016-04-13 | 展讯通信(上海)有限公司 | 无线通信接收机及其干扰消除方法与装置、信号解调方法 |
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JPH1117646A (ja) * | 1997-06-20 | 1999-01-22 | Nec Corp | 可変レートcdma送信電力制御方式 |
JPH11150522A (ja) * | 1997-11-17 | 1999-06-02 | Oki Electric Ind Co Ltd | 復号方法及び装置 |
JPH11298443A (ja) * | 1998-04-13 | 1999-10-29 | Matsushita Electric Ind Co Ltd | 無線受信装置 |
Family Cites Families (9)
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FI97583C (fi) * | 1995-02-02 | 1997-01-10 | Nokia Mobile Phones Ltd | Tiedonsiirtomenetelmä, lähetin ja vastaanotin |
US5960048A (en) * | 1996-03-26 | 1999-09-28 | Telefonaktiebolaget Lm Ericsson | Method and an arrangement for receiving a symbol sequence |
JP3409628B2 (ja) * | 1996-06-19 | 2003-05-26 | 株式会社エヌ・ティ・ティ・ドコモ | Cdma通信方法およびグループ拡散変調器 |
JP3759963B2 (ja) * | 1997-05-16 | 2006-03-29 | 株式会社エヌ・ティ・ティ・ドコモ | 可変レート送信方法、受信方法、可変レート送信装置および受信装置 |
JP3024750B2 (ja) * | 1998-04-07 | 2000-03-21 | 日本電気株式会社 | Ds−cdmaマルチユーザ干渉キャンセラ装置及びds−cdma通信システム |
JP3397695B2 (ja) * | 1998-07-16 | 2003-04-21 | 松下電器産業株式会社 | 相関検出装置及びcdma受信装置 |
JP2001156749A (ja) * | 1999-09-17 | 2001-06-08 | Hitachi Kokusai Electric Inc | Cdma移動局装置 |
JP3424748B2 (ja) * | 2000-05-25 | 2003-07-07 | 日本電気株式会社 | Cdma受信装置およびレート整合処理方法 |
DE60025723T2 (de) * | 2000-07-11 | 2006-11-09 | Fujitsu Ltd., Kawasaki | Codemultiplex-signalempfangsgerät |
-
2000
- 2000-01-18 JP JP2000009268A patent/JP2001203668A/ja active Pending
-
2001
- 2001-01-10 CN CN01800053A patent/CN1358370A/zh active Pending
- 2001-01-10 AU AU25474/01A patent/AU2547401A/en not_active Abandoned
- 2001-01-10 EP EP01900642A patent/EP1161012A4/en not_active Withdrawn
- 2001-01-10 US US09/936,731 patent/US20030067967A1/en not_active Abandoned
- 2001-01-10 WO PCT/JP2001/000064 patent/WO2001054329A1/ja not_active Application Discontinuation
Patent Citations (3)
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JPH1117646A (ja) * | 1997-06-20 | 1999-01-22 | Nec Corp | 可変レートcdma送信電力制御方式 |
JPH11150522A (ja) * | 1997-11-17 | 1999-06-02 | Oki Electric Ind Co Ltd | 復号方法及び装置 |
JPH11298443A (ja) * | 1998-04-13 | 1999-10-29 | Matsushita Electric Ind Co Ltd | 無線受信装置 |
Non-Patent Citations (1)
Title |
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YUKIHIKO OKUMURA ET AL.: "DS-CDMA ni okeru kaisouteki chokkou fugou keiretsu wo mochiita blind kahen rate data densou", TECHNICAL RESEARCH REPORT OF THE INSTITUTE OF ELECTRONICS, INFORMATION AND COMMUNICATION ENGINEER, vol. 97, no. 322, 16 October 1997 (1997-10-16), pages 7 - 13, RCS97-114, XP002938934 * |
Also Published As
Publication number | Publication date |
---|---|
JP2001203668A (ja) | 2001-07-27 |
AU2547401A (en) | 2001-07-31 |
CN1358370A (zh) | 2002-07-10 |
US20030067967A1 (en) | 2003-04-10 |
EP1161012A4 (en) | 2002-09-11 |
EP1161012A1 (en) | 2001-12-05 |
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