WO2005064809A1 - A data receiver having means for minimizing interference and method used in such a receiver - Google Patents
A data receiver having means for minimizing interference and method used in such a receiver Download PDFInfo
- Publication number
- WO2005064809A1 WO2005064809A1 PCT/IB2004/004186 IB2004004186W WO2005064809A1 WO 2005064809 A1 WO2005064809 A1 WO 2005064809A1 IB 2004004186 W IB2004004186 W IB 2004004186W WO 2005064809 A1 WO2005064809 A1 WO 2005064809A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- data
- channel
- receiver
- interference
- unscrambling
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims description 4
- 238000011156 evaluation Methods 0.000 claims 2
- 230000001934 delay Effects 0.000 description 3
- 238000005070 sampling Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 2
- 230000003071 parasitic effect Effects 0.000 description 2
- 101100496169 Arabidopsis thaliana CLH1 gene Proteins 0.000 description 1
- 101100044057 Mesocricetus auratus SYCP3 gene Proteins 0.000 description 1
- 101100080600 Schizosaccharomyces pombe (strain 972 / ATCC 24843) nse6 gene Proteins 0.000 description 1
- 230000001413 cellular effect Effects 0.000 description 1
- 101150111293 cor-1 gene Proteins 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
Classifications
-
- 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
-
- 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
- H04B1/711—Interference-related aspects the interference being multi-path interference
- H04B1/7115—Constructive combining of multi-path signals, i.e. RAKE receivers
-
- 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
- H04B2201/70701—Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation featuring pilot assisted reception
Definitions
- a data receiver having means for minimizing interference and method used in such a receiver.
- the present invention relates to a data receiver having means for minimizing interference.
- This kind of data receiver is used in mobile phones, which comply with the UMTS standard.
- this standard proposes to use spreading codes having orthogonality properties.
- An important problem faced by such mobile phones is that the effect of propagation paths of the data is to be eliminated.
- a known solution for eliminating this interference is the use of the CPICH channel, which transmits 256 "1", transformed into "1+j" after modulation. So, at the receiver side in the mobile, the channel can be estimated in an easy way.
- the following references can be consulted as prior art considerations.
- a data receiver for receiving user data and reference data coming from a transmitter via at least a channel, comprising means for unscrambling and means for despreading received data, means for analyzing the characteristic of the channel, means for evaluating the contribution of interference of data caused by the channel and a substracter means intended for cancelling the contribution of interference in the user data, said substracter means being placed before said unscrambling means.
- FIG.1 shows a system in which the invention is applied
- -Fig.2 shows a transmitter from which CPICH is transmitted
- -Fig.3 shows a data receiver according to the invention
- FIG.4 shows a part of the receiver shown in Fig.3,
- FIG.5 shows a second part of the receiver shown in Fig.3.
- Fig.1 shows a system in which the invention is applied.
- the system is a
- Reference 1 shows a base station comprising a transmitter 2 having a high-frequency part 3 and the reference 5 a mobile station.
- the link from the base station to the mobile station or mobile is determined by a given scrambling code.
- the arrows PI, P2, P3.... indicate various paths, providing various delays ⁇ , ⁇ 2, ⁇ 3..., by which the waves are propagated from an antenna 6 connected to the output of the high-frequency part 3 to an antenna 8 that the mobile 5 comprises.
- the mobile station can be interfered by links that have a different scrambling code.
- Fig.2 shows, the transmitter 2 in a schematic way.
- Fig.3 shows a mobile station 5 in a schematic way. As usual, it comprises a screen 25, a speaker 26, a microphone 27 and a keyboard 28. A general electronic part 29 manages all the tasks not specially covered by the invention. This Fig.
- This part 30 comprises a high-frequency head 31 from which data are provided, after a high-rate receiving filter 32 elaborated by an over-sampling device 34.
- the high-frequency head 31 also supplies data to a channel estimator 35 and to a delay estimator 38, which determines the delays r ⁇ , ⁇ 2, ⁇ 3..., of the cited paths PI, P2, P3 Scrambling codes are delivered by a scrambling code generator 39 and spreading codes by a spreading code generator 40. All the codes provided by the elements 35, 38 and 39 can be used by a Rake type receiver 42.
- the output of this receiver 42 is connected to the input of the electronic part 29.
- the receiver 42 comprises a plurality of fingers RFl,..RFj,..RFk,..and RFJ as is usual for this kind of receiver.
- a combining device 45 combines all the information coming from the fingers to provide symbols.
- Fig.4 shows the structure of the Rake finger RFj cooperating with the other parts of the receiver.
- the finger RFj comprises a plurality of interference estimators allocated to each path respectively.
- IEPlFj is the interference estimator of the path 1 on finger 1.
- IEPkFj is the interference estimator of the path k on finger j and so on.
- the outputs of these estimators are added together by the adding device 60.
- the estimations of the interference are substracted from the data signal provided by the head 31 thanks to a substracter 62.
- the data signal are delayed by the delay device 61 which delays the data by an amount which has a relation to the delay of the path concerned.
- an unscrambling operation is performed by the multiplier 64, which provides data from the scrambling code coming from generator 39.
- a conjugate device 66 evaluates the conjugate of the scrambling code.
- This scrambling code is the scrambling code assigned to the link.
- the data are despread by the multiplier 68 taking into account the code provided by the generator 40.
- the interference estimator IEPkFj is shown in more detailed. It comprises a plurality of correlators COR1...CORJ-1 the number of which is dependent on the number of paths. The output signals of these correlators are added together by the adder 70 and from here sent to the adder 60.
- Fig.5 shows the structure of the correlator CORj.
- This correlator receives the scrambling codes Scrj of the other links which contribute to the interferences to be cancelled. Note that there are J-l such correlators for each finger, as it is possible to eliminate the interference of all j paths with j ⁇ k, with k being the finger under
- a multiplier 80 performs an operation concerning h and the value of the CPICH i.e. "1+j" in complex form.
- N multipliers M(-N) to M(+N) perform an operation with the scrambling code of the parasitic link delayed in accordance with the delay rj s of these links.
- the output signals of these multipliers are applied to the operators p(-N) to p(+N).
- An adder 85 sums all the signals at the output of these multipliers before they are applied to the adder 70.
- the working of the channel estimator is facilitated by the "1" sequence formed, coming from the CPICH and transformed into "1+j" considered in complex form. In this way, the coefficients h of the impulse response of the channel are defined in an easy way. From these received data, the delay ⁇ , fl, r3 provided by the various paths PI, P2, P3,... are also estimated in the delay estimator 38.
- the interference estimator carries out the following formula:
- r(n) *( + j)
- p is the cross-correlation between the transmit and receive filter
- i j is channel coefficients of the path j
- S C)n is the scrambling sequence
- S p>n is the spreading sequence of the pilot channel
- 1+j is the CPICH symbol
- Tc is the duration of a chip (time slot obtained after scrambling)
- OS is an integer that represents an over-sampling factor.
- ⁇ ] >0 is an integer which measures the delay in T c unit and ⁇ 1;0 the number of over-sampling periods. It is to be understood that the invention covers the case for which the realization of all the embodiments disclosed is made by a processor and convenient software.
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Noise Elimination (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP04801406A EP1700387A1 (en) | 2003-12-22 | 2004-12-10 | A data receiver having means for minimizing interference and method used in such a receiver |
US10/584,096 US7853213B2 (en) | 2003-12-22 | 2004-12-10 | Data receiver having means for minimizing interference and method used in such a receiver |
JP2006544593A JP4620064B2 (en) | 2003-12-22 | 2004-12-10 | Data receiver having means for minimizing interference and method used in the receiver |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP03300281.7 | 2003-12-22 | ||
EP03300281 | 2003-12-22 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2005064809A1 true WO2005064809A1 (en) | 2005-07-14 |
Family
ID=34717270
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/IB2004/004186 WO2005064809A1 (en) | 2003-12-22 | 2004-12-10 | A data receiver having means for minimizing interference and method used in such a receiver |
Country Status (5)
Country | Link |
---|---|
US (1) | US7853213B2 (en) |
EP (1) | EP1700387A1 (en) |
JP (1) | JP4620064B2 (en) |
CN (1) | CN1898880A (en) |
WO (1) | WO2005064809A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20120045995A1 (en) * | 2009-04-27 | 2012-02-23 | Hiroshi Nakano | Interference suppression wireless communication system and interference suppression wireless communication device |
CN116614339B (en) * | 2023-07-17 | 2023-10-03 | 天地信息网络研究院(安徽)有限公司 | PAPR suppression transmitter of MC-CDMA system |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1274177A2 (en) * | 2001-03-30 | 2003-01-08 | Envoy Networks, Inc. | Method and apparatus for regenerative based interference cancellation within a communication system |
EP1304815A2 (en) * | 2001-10-17 | 2003-04-23 | The National University of Singapore | A code division multiple access downlink receiver |
WO2003063375A1 (en) | 2002-01-25 | 2003-07-31 | Kabushiki Kaisha Toshiba | Rake receiver for cdma systems with space-time transmit diversity |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3904754B2 (en) * | 1999-02-25 | 2007-04-11 | 富士通株式会社 | Transmitting apparatus, receiving apparatus and method thereof in code division multiplex communication |
JP3718403B2 (en) * | 2000-03-13 | 2005-11-24 | 株式会社東芝 | Rake receiver |
JP4076202B2 (en) * | 2000-08-07 | 2008-04-16 | 富士通株式会社 | Spread spectrum signal receiver and receiving method |
WO2002032017A1 (en) * | 2000-10-11 | 2002-04-18 | Samsung Electronics Co., Ltd. | Apparatus and method for controlling transmit antenna array for physical downlink shared channel in a mobile communication system |
US8290098B2 (en) * | 2001-03-30 | 2012-10-16 | Texas Instruments Incorporated | Closed loop multiple transmit, multiple receive antenna wireless communication system |
FI20010937A0 (en) * | 2001-05-04 | 2001-05-04 | Nokia Corp | Selection of a spreading code in a spread spectrum system |
US7133435B2 (en) * | 2001-06-20 | 2006-11-07 | Texas Instruments Incorporated | Interference cancellation system and method |
-
2004
- 2004-12-10 CN CNA2004800382848A patent/CN1898880A/en active Pending
- 2004-12-10 JP JP2006544593A patent/JP4620064B2/en not_active Expired - Fee Related
- 2004-12-10 US US10/584,096 patent/US7853213B2/en not_active Expired - Fee Related
- 2004-12-10 EP EP04801406A patent/EP1700387A1/en not_active Ceased
- 2004-12-10 WO PCT/IB2004/004186 patent/WO2005064809A1/en not_active Application Discontinuation
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1274177A2 (en) * | 2001-03-30 | 2003-01-08 | Envoy Networks, Inc. | Method and apparatus for regenerative based interference cancellation within a communication system |
EP1304815A2 (en) * | 2001-10-17 | 2003-04-23 | The National University of Singapore | A code division multiple access downlink receiver |
WO2003063375A1 (en) | 2002-01-25 | 2003-07-31 | Kabushiki Kaisha Toshiba | Rake receiver for cdma systems with space-time transmit diversity |
Non-Patent Citations (4)
Title |
---|
"CPICH interference cancellation as a mean for increasing DL capacity", 3GPP TSGR R4-01-0238 |
"CPICH interference cancellation as a means for increasing DL capacity", 3GPP TSG RI-00-1371 |
"Further results on CPICH interference cancellation", 3GPP TSGR R1-O1-0030 |
3GPP TR 25.991 V2.0.0, March 2001 (2001-03-01) |
Also Published As
Publication number | Publication date |
---|---|
EP1700387A1 (en) | 2006-09-13 |
CN1898880A (en) | 2007-01-17 |
US20070147480A1 (en) | 2007-06-28 |
US7853213B2 (en) | 2010-12-14 |
JP4620064B2 (en) | 2011-01-26 |
JP2007515889A (en) | 2007-06-14 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US10153805B2 (en) | Iterative interference suppressor for wireless multiple-access systems with multiple receive antennas | |
JP4263368B2 (en) | Apparatus and method for interference cancellation in spread spectrum communications | |
US20050213529A1 (en) | Channel estimation in a CDMA receiver | |
US6600729B1 (en) | DS-CDMA multi-user interference canceller and DS-CDMA Communication system | |
US20100215082A1 (en) | Iterative interference canceller for wireless multiple-access systems employing closed loop transmit diversity | |
US20200287645A1 (en) | Advanced signal processors for interference cancellation in baseband receivers | |
CN1774896B (en) | Channel estimation of a receiver multipath CDMA signal | |
EP1391052B1 (en) | Cdma searcher with time offset compensation | |
GB2386038A (en) | Channel estimation in a radio receiver | |
EP1838009B1 (en) | Spread spectrum receiver and channel compensation method thereof | |
US8295417B2 (en) | Method and apparatus for efficient estimation of interference in a wireless receiver | |
US7324584B1 (en) | Low complexity interference cancellation | |
US7027490B2 (en) | Method and apparatus for reducing spread spectrum noise | |
US7853213B2 (en) | Data receiver having means for minimizing interference and method used in such a receiver | |
JP2002077104A (en) | Spread spectrum receiver | |
US8493953B1 (en) | Method and device for mitigation of multi-user interference in code division multiple access | |
JP3926366B2 (en) | Spread spectrum rake receiver | |
WO2007038016A2 (en) | An iterative interference canceller for wireless multiple-access systems with multiple receive antennas | |
JPH07264111A (en) | Code division multiple address receiver | |
GB2377864A (en) | Interference cancellor including correlators for despreading signals and calculating the difference between correlation values and interference replicas |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
WWE | Wipo information: entry into national phase |
Ref document number: 200480038284.8 Country of ref document: CN |
|
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 JP 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 NA 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 IS IT LT LU MC NL PL 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 | ||
REEP | Request for entry into the european phase |
Ref document number: 2004801406 Country of ref document: EP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2004801406 Country of ref document: EP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2006544593 Country of ref document: JP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2007147480 Country of ref document: US Ref document number: 10584096 Country of ref document: US |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
WWW | Wipo information: withdrawn in national office |
Ref document number: DE |
|
WWP | Wipo information: published in national office |
Ref document number: 2004801406 Country of ref document: EP |
|
WWP | Wipo information: published in national office |
Ref document number: 10584096 Country of ref document: US |