EP1849245A2 - Wireless multiple access system for suppressing inter-cell interference - Google Patents
Wireless multiple access system for suppressing inter-cell interferenceInfo
- Publication number
- EP1849245A2 EP1849245A2 EP06715997A EP06715997A EP1849245A2 EP 1849245 A2 EP1849245 A2 EP 1849245A2 EP 06715997 A EP06715997 A EP 06715997A EP 06715997 A EP06715997 A EP 06715997A EP 1849245 A2 EP1849245 A2 EP 1849245A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- scrambling code
- code
- sub
- orthogonal
- channel signals
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
- H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
- H04B7/2615—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using hybrid frequency-time division multiple access [FDMA-TDMA]
-
- 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
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0058—Allocation criteria
- H04L5/0073—Allocation arrangements that take into account other cell interferences
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03828—Arrangements for spectral shaping; Arrangements for providing signals with specified spectral properties
- H04L25/03866—Arrangements for spectral shaping; Arrangements for providing signals with specified spectral properties using scrambling
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0014—Three-dimensional division
- H04L5/0016—Time-frequency-code
- H04L5/0017—Time-frequency-code in which a distinct code is applied, as a temporal sequence, to each frequency
Definitions
- the present invention relates to a wireless mobile communication system, and more
- orthogonal frequency division multiplexing OFDM
- code division OFDM
- CDMA multiple access
- a high speed data stream is divided into a plurality of low
- the OFDM system may increase symbol duration and
- OFDM OFDM Acess
- each of the sub-channels are adjacent to each other or can be uniformly spaced
- channels may cause complexity in implementation, but it may bring advantage such as
- a slot allocated to each user is defined by a 2-dimensional data region, and it is a set
- a data region in OFDMA is represented as
- axis is defined as each sub-channel.
- a data region is allocated to a specific user. But, in a uplink transmission, a data region is allocated to a specific user. But, in a
- a base station transmits data through another data region.
- the inter-cell interference is suppressed in
- the same frequency may exist in a neighbor cell, whereby the inter-user interference
- OFDM orthogonal frequency division multiplexing
- FIG. 1 shows an arranged form of OFDM sub-carriers that are widely used. In this
- fj 0, 1, 2, ... , N-I
- ⁇ f indicates a sub-carrier interval
- OFDMA is a technique of applying frequency division based on the OFDM
- the OFDMA is a system enabling several users
- FIG. 2 is a block diagram of a transmitting end of an OFDM system according to a
- FIG. 2 a transmitting end of an OFDM system according to a
- OFDM modulator 10 modulating and multiplexing data with sub-
- the OFDM modulator 10 comprises a serial/parallel (S/P) converter 10-1 converting
- a receiving end of the OFDM system has a
- the serial data converted to the baseband is converted to a
- each of the parallel-converted data is multiplexed into the sub-carrier by the IFFT unit 10-2.
- the RF end 11 converts the data multiplexed by the IFFT unit 10-2 to the RF signal and
- OFCDM orthogonal frequency code
- FIG. 3 is a block diagram of a transmitting end of an OFCDM system 25. Referring
- a transmitting end of an OFCDM system comprises an OFCDM modulator 20
- the OFCDM modulator 20 comprises a serial/parallel (S/P) converter 20-1
- code division multiplexing processing unit 20-2 multiplies each of the parallel data by a
- a receiving end of the OFCDM system has a configuration reverse to that of the
- channels is multiplexed with the orthogonal code by the CDM processing unit 20-2.
- the RF unit 21 converts the data multiplexed by the IFFT unit 20-2 of
- the OFCDM modulator 20 to the RF signal and then transmits the RF signal via at lease one
- OFDMA orthogonal frequency division multiplexing access
- the interference from load increment a cell interference averaging scheme, a cell
- the frequency reuse rate of the OFDMA system is basically smaller
- the OFDM or OFCDM technique is superior to the single frequency system or the
- CDMA system is that the problems of the selective frequency fading (in case of single
- the frequency use rate reduction multiple carrier CDMA or Nx
- CDMA CDMA based cellular mobile
- the present invention is directed to an apparatus for multiple access and
- An object of the present invention is to provide an apparatus for multiple access in a
- using OFDM in a wireless communication system comprises converting an input signal to a
- the scrambling code is used for differentiating signals transmitted in neighboring cells; and converting the substantially
- orthogonal outputs to signals by performing inverse fourier transform.
- the orthogonal outputs to signals by performing inverse fourier transform.
- scrambling code has either orthogonal or pseudo orthogonal characteristic. Moreover, a
- length of the scrambling code may be variable.
- the scrambling code is applied over
- the scrambling code comprises one of PN
- the method further comprises
- the spreading code is multiplied to each one
- communication system comprises converting an input signal to a plurality of sub-channel
- scrambling code is used for differentiating signals transmitted in neighboring cells.
- an apparatus for transmitting data using OFDM in
- a wireless communication system comprises a serial-to-parallel converter to convert an
- a processing unit operatively connected to the serial-to-parallel converter to multiply at least one of the plurality of sub-channel
- an apparatus for transmitting data using OFDM comprises a
- serial-to-parallel converter to convert an input signal to a plurality of sub-channel signals
- processor operatively connected to the transform unit to multiply at least one of the signals
- FIG. 1 is a diagram of an arranged form of OFDM sub-carriers according to related
- FIG. 2 is a block diagram of a transmitting end of an OFDM system according to
- FIG. 3 is a block diagram of a related ait OFCDM system.
- FIG. 4 is a graph for explaining an exemplary allocation of a spreading code
- FIG. 5 is a diagram of distribution of users using a cell identification spreading code
- FIG. 6 and FIG. 7 are diagrams for explaining how a CDM system is applicable to the
- present invention by taking time, frequency and code domains as references.
- FIG. 8 is a block diagram of a transmitting end of an OFDM system according to the
- FIG. 9 is a block diagram of an OFDM system according to an embodiment of the present invention.
- the present invention solves an interference problem between downlink cells using a
- each symbol to be transmitted is transmitted using carriers such as OFDMA and the like.
- OFDMA orthogonal frequency division multiplex
- the scrambling code are transmitted using frequency-time bin amounting to the number of
- codes particularly orthogonal codes are allocated to cells respectively. Therefore, other-cell
- the scrambling codes are applicable to time or frequency domain, and the
- SF is variable according to cell configuration and air channel condition.
- FIG. 4 is a graph for explaining an exemplary allocation of a scrambling code
- frequency domain is a sub-carrier and a unit of a time domain means a symbol time.
- downlink data can be transmitted using a
- a SF value may be variously applied according to a combination of a time domain
- SF_ t j me a frequency domain spreading factor
- SF_fr eq a frequency domain spreading factor
- 'SF_ fi . eq 2'.
- 'SF' is defined by 'SF_ t i me • SF_ fieq '.
- the SF itself, and the ratio of frequency domain spreading factor or the time domain
- spreading factor to the SF may be determined based on cell configuration and channel
- PN codes an OVSF (orthogonal variable spreading factor) codes are used as the PN codes.
- OVSF orthogonal variable spreading factor
- orthogonal codes Moreover, a pseudo-orthogonal code can be used as the scrambling code.
- the orthogonal code such as OVSF is preferably used.
- the SF of the above-mentioned codes is variable based on cell configuration and
- a terminal to adopt the cell identification scrambling code For example, a terminal to adopt the cell identification scrambling code
- SINR signal to interference noise ratio
- scrambling code is adopted, by combining at lease two above-mentioned methods.
- FIG. 5 is a diagram of distribution of users using a cell identification scrambling code
- the scrambling can be applied to a user in the vicinity of a base station.
- a transmission power a quantity of interference, a user's location.
- the system proposed by the present invention employs the technique of combining
- data modulation is
- OFDM OFDM
- OFCDM OFDM
- a user and channel identifying function is carried out by a CDM unit prior to IFFT.
- a CDM unit prior to IFFT.
- OFDM OFDM
- the OFCDM based method proposed by the present invention is
- identification has a user and channel identifying function also, which is performed by a
- CDM unit of an OFCDM modulator ahead of the CDM executing unit CDM unit of an OFCDM modulator ahead of the CDM executing unit.
- FIGS. 6 and 7 are diagrams for explaining how a CDM system is applicable to the
- FIG. 6 and FIG. 8 show that the code division multiplexing (CDM) scheme is used in
- the OFDMA scheme (FDM) is applied for user or channel identification,
- 'Cell 2' and 'Cell 3' in FIG. 6 indicate cells that can be identified with codes, respectively.
- the cells adjacent to each other use the same frequency band, the cells are able to
- FIG. 8 is a block diagram of a transmitting end of an OFDM system according to one
- system includes the related art OFDM modulator shown in FIG. 2 and further includes a
- code division unit 32 performing a spreading and/or scrambling function for cell
- the code division unit 32 identifies cells using spreading and scrambling scheme
- orthogonal codes for data multiplexed by the OFDM modulator 30.
- the (pseudo) orthogonal codes can be used by spreading and scrambling (non-
- orthogonal codes which include codes
- the receiving end demultiplexes an RF signal and demodulates the
- the OFDM and CDM combined system illustrated in FIG. 8 performs additional tasks
- OFDM and CDM combined system is focused on solving the cell interference problem by identifying and differentiating cells by performing code multiplexing after the OFDM
- code used for such process is preferably scrambling code described above with respect to
- FIG. 7 and FIG. 9 show that a code division scheme is applicable not only to cell
- FIG. 9 is a block diagram of a transmitting end of an OFDM system 45 according to
- OFDM system includes a code division unit 42 added to the OFDM system.
- division unit 42 identifies cells, users and channels in a manner of spreading and
- the (pseudo) orthogonal codes can be used for spreading and scrambling
- orthogonal codes include codes
- orthogonal or pseudo orthogonal codes e.g., scrambling codes
- the code division unit 42 can raise
- division unit 42 can identify one of cell, user channel, user group and channel group. Alternatively, the function of differentiating cells by using different scrambling codes may
- CDM processing unit 40-2 be implemented in the CDM processing unit 40-2.
- the CDM processing unit 40-2 the CDM processing
- unit 40-2 may incorporate the function of the code division unit 42 so that neighboring cells
- system i.e., system design flexibility
- the present invention efficiently solves the cell interference problem
- the present invention can be applied to a broadband wireless access system.
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020050013796A KR20060092713A (en) | 2005-02-18 | 2005-02-18 | Ofdm technique based multiple access system and method applicable for wideband cellular mobile communication system |
KR1020050036813A KR20060114751A (en) | 2005-05-02 | 2005-05-02 | Method of transmitting downlink data in wireless mobile communication system adopting multiple access method using multiple subcarrier |
PCT/KR2006/000546 WO2006088326A2 (en) | 2005-02-18 | 2006-02-17 | Wireless multiple access system for suppressing inter-cell interference |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1849245A2 true EP1849245A2 (en) | 2007-10-31 |
EP1849245A4 EP1849245A4 (en) | 2011-08-03 |
Family
ID=36916860
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP06715997A Ceased EP1849245A4 (en) | 2005-02-18 | 2006-02-17 | Wireless multiple access system for suppressing inter-cell interference |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP1849245A4 (en) |
WO (1) | WO2006088326A2 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101132386B (en) * | 2007-09-24 | 2013-01-30 | 杭州国芯科技股份有限公司 | Interference restraining method for orthogonal frequency division multiplexing signal |
US20130003690A1 (en) * | 2011-03-14 | 2013-01-03 | Lg Electronics Inc. | Apparatus and method for transmitting and receiving control information in a wireless communication system |
US9871565B2 (en) * | 2013-03-01 | 2018-01-16 | Sony Corporation | MIMO communication method, transmitting device, and receiving device |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7035201B2 (en) * | 2001-04-20 | 2006-04-25 | Mediatek Inc. | Programmable transceiver structure of multi-rate OFDM-CDMA for wireless multimedia communications |
US20030081538A1 (en) * | 2001-10-18 | 2003-05-01 | Walton Jay R. | Multiple-access hybrid OFDM-CDMA system |
KR100532586B1 (en) * | 2002-10-30 | 2005-12-02 | 한국전자통신연구원 | Appratus and Method for transmitting and receiving using orthogonal code and non binary value in CDMA/OFDM |
US7286603B2 (en) * | 2003-05-01 | 2007-10-23 | Nokia Corporation | Method and apparatus for increasing data rates in a wideband MC-CDMA telecommunication system |
-
2006
- 2006-02-17 EP EP06715997A patent/EP1849245A4/en not_active Ceased
- 2006-02-17 WO PCT/KR2006/000546 patent/WO2006088326A2/en active Application Filing
Non-Patent Citations (4)
Title |
---|
ATARASHI: "VARIABLE SPREADING FACTOR-ORTHOGONAL FREQUENCY AND CODE DIVISION MULTIPLEXING (VSF-OFCDM) FOR BROADBAND PACKET WIRELESS ACCESS", MULTI-CARRIER SPREAD-SPECTRUM AND RELATED TOPICS, KLUWER, NL, 1 January 2002 (2002-01-01), pages 113-122, XP008071845, * |
KISHIYAMA Y ET AL: "Experiments on throughput performance above 100Mbps in forward link for VSF-OFCDM broadband wireless access", VEHICULAR TECHNOLOGY CONFERENCE, 2003. VTC 2003-FALL. 2003 IEEE 58TH ORLANDO, FL, USA 6-9 OCT. 2003; [IEEE VEHICULAR TECHNOLGY CONFERENCE], PISCATAWAY, NJ, USA,IEEE, US, vol. 3, 6 October 2003 (2003-10-06), pages 1863-1868, XP010702493, DOI: DOI:10.1109/VETECF.2003.1285348 ISBN: 978-0-7803-7954-1 * |
MAEDA N ET AL: "Throughput comparison between vsf-ofcdm and ofdm considering effect of sectorization in forward link broadband packet wireless access", VTC 2002-FALL. 2002 IEEE 56TH. VEHICULAR TECHNOLOGY CONFERENCE PROCEEDINGS. VANCOUVER, CANADA, SEPT. 24 - 28, 2002; [IEEE VEHICULAR TECHNOLGY CONFERENCE], NEW YORK, NY : IEEE, US, vol. 1, 24 September 2002 (2002-09-24), pages 47-51, XP010608514, DOI: DOI:10.1109/VETECF.2002.1040299 ISBN: 978-0-7803-7467-6 * |
See also references of WO2006088326A2 * |
Also Published As
Publication number | Publication date |
---|---|
EP1849245A4 (en) | 2011-08-03 |
WO2006088326A2 (en) | 2006-08-24 |
WO2006088326A3 (en) | 2006-11-09 |
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Inventor name: KIM, HAK SEONG,LG INSTITUTE Inventor name: ROH, DONG WOOKLG INSTITUTE Inventor name: SEO, DONG YOUN Inventor name: AHN, JOON KUI,108-1505, GWANAK HYUNDAI APT. Inventor name: KIM, BONG HOE,103-105, TAEYOUNG APT. |
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RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: AHN, JOON KUI,108-1505, GWANAK HYUNDAI APT. Inventor name: ROH, DONG WOOKLG INSTITUTE Inventor name: KIM, HAK SEONG,LG INSTITUTE Inventor name: KIM, BONG HOE,103-105, TAEYOUNG APT. Inventor name: SEO, DONG YOUN |
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Inventor name: KIM, HAK SEONGC/O LG INSTITUTE Inventor name: SEO, DONG YOUN Inventor name: ROH, DONG WOOKLG INSTITUTE Inventor name: AHN, JOON KUI,108-1505, GWANAK HYUNDAI APT. Inventor name: KIM, BONG HOE,103-105, TAEYOUNG APT. |
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