WO2006020400A2 - Method and system for link adaptation in an orthogonal frequency division multiplexing (ofdm) wireless communication system - Google Patents
Method and system for link adaptation in an orthogonal frequency division multiplexing (ofdm) wireless communication system Download PDFInfo
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- WO2006020400A2 WO2006020400A2 PCT/US2005/026670 US2005026670W WO2006020400A2 WO 2006020400 A2 WO2006020400 A2 WO 2006020400A2 US 2005026670 W US2005026670 W US 2005026670W WO 2006020400 A2 WO2006020400 A2 WO 2006020400A2
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- 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
- H04L27/2626—Arrangements specific to the transmitter only
- H04L27/2646—Arrangements specific to the transmitter only using feedback from receiver for adjusting OFDM transmission parameters, e.g. transmission timing or guard interval length
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- 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
- H04L5/0044—Arrangements for allocating sub-channels of the transmission path allocation of payload
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/20—Monitoring; Testing of receivers
- H04B17/24—Monitoring; Testing of receivers with feedback of measurements to the transmitter
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
- H04B7/0417—Feedback systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
- H04B7/0621—Feedback content
- H04B7/0632—Channel quality parameters, e.g. channel quality indicator [CQI]
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- 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
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
- H04L1/0003—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes
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- 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
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
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- 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
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0015—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy
- H04L1/0016—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy involving special memory structures, e.g. look-up tables
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- 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
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
- H04L1/0026—Transmission of channel quality indication
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
- H04L25/0224—Channel estimation using sounding signals
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- 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
- H04L5/006—Quality of the received signal, e.g. BER, SNR, water filling
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/38—TPC being performed in particular situations
- H04W52/42—TPC being performed in particular situations in systems with time, space, frequency or polarisation diversity
Definitions
- the present invention is related to an orthogonal frequency division multiplexing (OFDM) wireless communication system. More particularly, the present invention is related to a method and system for link adaptation in an OFDM wireless communication system.
- OFDM orthogonal frequency division multiplexing
- OFDM orthogonal frequency division multiplexing
- MIMO multiple-input multiple-output
- OFDM-MIMO OFDM-MIMO
- Link adaptation is an approach for selecting communication parameters, including a coding rate, a modulation scheme, a transmit power or the like, in order to maximize the throughput.
- a method and system for link adaptation in an OFDM wireless communication system is provided.
- the sub-channels are divided into a plurality of groups.
- a channel quality indicator (CQI) is generated for each group based on channel quality status in each group of sub-channels, and communication parameters on each sub-channel are adjusted in accordance with the CQI.
- CQI channel quality indicator
- Figure 5 is a flow diagram of a process for adjusting communication parameters.
- Figure 6 shows generation of COI ( qt) for each group of sub-channels.
- Figure 7 is a diagram of a system for link adaptation.
- h ⁇ t ' r ⁇ h%' r ⁇ h ⁇ '' r ⁇ ...
- h ⁇ is a time-domain channel response vector of length W for the channel between the tth. transmit antenna and the rth receive antenna.
- the average power of the coefficient is expressed by ⁇ f ) 2 ⁇ which is independent of the values of it and r. This is because the size of the antenna array in MIMO systems is usually much less than the propagation distance of the first arrival path.
- IEEE 802.11 a/n a 20-MHz sampling rate is used, resulting in a
- Normalized power-delay profile can be expressed as -// //((Fr/ G- -l 1 g g- /5500))
- a ⁇ x ° ' ' '-' 71 ⁇ - I > is the frequency-domain channel response vector of length P for the channel between the ⁇ h transmit antenna and the ⁇ n receive antenna.
- H '' r consists of P sub ⁇ channels.
- the P" 1 sub-channel can be represented as
- Equation 6 which is independent of the values of * and r .
- ⁇ represents the number of sub-channels spaced between the two sub-channels under consideration.
- the parameter a the correlation between the two sub-channels spaced with k sub-carriers is reduced.
- the smaller the parameter a the more comparable the average power of the paths.
- such a channel consists of more effective multi-paths and therefore the channel becomes more frequency-selective.
- a ⁇ 0 ⁇ ⁇ Pk ⁇ ⁇ f or anv value of k In the limit case that a ⁇ 0 ⁇ ⁇ Pk ⁇ ⁇ f or anv value of k.
- the channel is flat fading (non frequency-selective)
- a ⁇ °° resulting in ' ? k ' ⁇ for all values ofk.
- k ' presents the correlation between two sub-channels spaced by k sub-carriers, it does not show clearly the correlation of the two sub ⁇ channels' power. Therefore, the correlation of sub-channels' power should be derived.
- the correlation of sub-channels' power is defined as
- Equation 11 Equation 11
- Equation 10 and Equation 11 are independent of the values of t and r .
- I n the derivation of Equation 10 and Equationll, it is assumed that the real and imaginary parts of a multi-path coefficient, (say p ⁇ L 5 j ⁇ ⁇ aye the same variance and are rndependent from each other. Substitution of Equation 10 and Equation 11 into Equation 9 results in
- FIG. 5 is a flow diagram of a process 500 for link adaptation in accordance with the present invention.
- Sub-channels are divided into a plurality of groups (step 502).
- Figure 6 shows a scheme for generating the CQI in each group of sub-channels.
- the correlation of the sub-channels' power in a group for different values of Q is shown in Table 2.
- a CQI is generated for each group based on channel quality status in each group (step 504).
- the channel quality status may be analyzed by different methods including, but not limited to, a signal-to-noise ratio (SNR), a bit error rate (BER), a packet error rate (PER), or the like.
- SNR signal-to-noise ratio
- BER bit error rate
- PER packet error rate
- L X J is the largest integer smaller or equal to x
- B is an integer which should be determined based on system requirements. SNR is calculated as
- NR is the number of receive antennas and ⁇ is the noise variance in each sub ⁇ channel.
- the CQI is fed back to adjust communication parameters (step 506).
- £ J x Jy T CQis are generated in a transmission frame (packet), where ⁇ is the number of transmit antennas. It is not necessary to report CQI on an OFDM symbol basis, since the channel may change little in a frame (packet) interval; and due to common phase error (CPE) invoked by the combination of RF oscillator and the phase-locked loop, the phase of the channel responses may change. However, such a change does not affect the power of the sub-channels. Therefore, the CQI can be calculated based on the channel responses estimated from the long training sequences on a frame basis without using the pilot tones inserted in OFDM symbols. The inserted pilot tones are used only for the purpose of correcting the CPE.
- CPE common phase error
- each of the CQI indicates one of four states that correspond to the modulation schemes (BPSK, QPSK, 16QAM, 64 QAM)
- a number of x ⁇ x ⁇ bits are required to report all of the CQIs.
- the CQI may represent a combination of two or more communication parameters, such as a combination of a coding rate and a modulation order.
- the modulation scheme may be kept constant for all the sub-channels while adjusting the coding rate according to the reported CQI for different groups of the sub-channels. In this case, the modulation scheme may be determined according to
- paths with relatively strong power may be selected. After the selection of the paths having relatively strong power, the number of effective paths is reduced to M that is usually less than W.
- Equation 3 the MIMO channel matrix of a reference sub-carrier may be transmitted so that calibration can be made.
- the network configures the reference subcarriers and the index of the subcarrier(s) are known to both the network and the subscriber. Accordingly, typically, the index of the reference subcarier(s) is not reported to the transmitter.
- the receiver can dynamically choose reference subcarriers based on instantaneous channel transfer functions of all subcarriers and other factors in the spectrum. The receiver chooses the index of the reference subcarrier and reports the index to the transmitter.
- FIG. 7 is a diagram of a system 700 for link adaptation.
- the system 700 comprises a CQI generator 702 and a link adaptor 704.
- the CQI generator 702 generates a CQI based on channel quality status of received signals 706 via each group of sub-channels.
- a CQI 708 generated by the CQI generator 702 is forwarded to the link adaptor 704 for generating control signals 710 for adjusting communication parameters.
- the communication parameters include, but are not limited to, a coding rate, a modulation mode, a transmit power level or the like.
- the link adaptor 704 may comprise a look-up table for adjusting communication parameters in accordance with the input CQI.
- the CQI generator 702 may reside at a wireless transmit/receive unit (WTRU), base station or both.
- the link adapter may reside at a WTRU, base station or both.
- the MIMO-OFDM transmitter and/or receiver of the above embodiments may be used in a WTRU or base station.
- the transmitter and/or receiver elements may be implemented as a single integrated circuit (IC), multiple ICs, logical programmable gate array (LPGA), discrete components or a combination of any of these IC(s), LPGA, and/or discrete components.
- a WTRU includes but is not limited to a user equipment, mobile station, fixed or mobile subscriber unit, pager, or any other type of device capable of operating in a wireless environment.
- a base station includes but is not limited to a Node-B, site controller, access point or any other type of interfacing device in a wireless environment.
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Priority Applications (9)
Application Number | Priority Date | Filing Date | Title |
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JP2007525642A JP2008510374A (en) | 2004-08-11 | 2005-07-27 | Method and system for link adaptation in an orthogonal frequency division multiplexing (OFDM) wireless communication system |
CA002576481A CA2576481A1 (en) | 2004-08-11 | 2005-07-27 | Method and system for link adaptation in an orthogonal frequency division multiplexing (ofdm) wireless communication system |
MX2007001709A MX2007001709A (en) | 2004-08-11 | 2005-07-27 | Method and system for link adaptation in an orthogonal frequency division multiplexing (ofdm) wireless communication system. |
BRPI0515018-3A BRPI0515018A (en) | 2004-08-11 | 2005-07-27 | method and link adaptation system in orthogonal frequency division multiplex (ofdm) wireless communication system |
AU2005274162A AU2005274162B2 (en) | 2004-08-11 | 2005-07-27 | Method and system for link adaptation in an orthogonal frequency division multiplexing (OFDM) wireless communication system |
EP05781896A EP1779571A4 (en) | 2004-08-11 | 2005-07-27 | Method and system for link adaptation in an orthogonal frequency division multiplexing (ofdm) wireless communication system |
IL181026A IL181026A0 (en) | 2004-08-11 | 2007-01-29 | Method and system for link adaptation in an orthogonal frequency division multiplexing (ofdm) wireless communication system |
NO20071261A NO20071261L (en) | 2004-08-11 | 2007-03-08 | Link Fitting Method and System in an Orthogonal Frequency Shared Multiplex (OFDM) Wireless Communication System |
AU2008243233A AU2008243233A1 (en) | 2004-08-11 | 2008-11-13 | Method and system for link adaptation in an orthogonal frequency division multiplexing (OFDM) wireless communication system |
Applications Claiming Priority (4)
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US60074104P | 2004-08-11 | 2004-08-11 | |
US60/600,741 | 2004-08-11 | ||
US11/123,738 | 2005-05-06 | ||
US11/123,738 US20060034244A1 (en) | 2004-08-11 | 2005-05-06 | Method and system for link adaptation in an orthogonal frequency division multiplexing (OFDM) wireless communication system |
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WO2006020400A2 true WO2006020400A2 (en) | 2006-02-23 |
WO2006020400A3 WO2006020400A3 (en) | 2006-12-07 |
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PCT/US2005/026670 WO2006020400A2 (en) | 2004-08-11 | 2005-07-27 | Method and system for link adaptation in an orthogonal frequency division multiplexing (ofdm) wireless communication system |
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US (1) | US20060034244A1 (en) |
EP (2) | EP1779571A4 (en) |
JP (1) | JP2008510374A (en) |
KR (2) | KR20070067705A (en) |
AU (2) | AU2005274162B2 (en) |
BR (1) | BRPI0515018A (en) |
CA (1) | CA2576481A1 (en) |
IL (1) | IL181026A0 (en) |
MX (1) | MX2007001709A (en) |
NO (1) | NO20071261L (en) |
TW (3) | TWI305094B (en) |
WO (1) | WO2006020400A2 (en) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2007109917A1 (en) * | 2006-03-24 | 2007-10-04 | Huawei Technologies Co., Ltd. | Method and system for subband indicator signalling |
JP2008219401A (en) * | 2007-03-02 | 2008-09-18 | Sanyo Electric Co Ltd | Slot allocating method during slot linking and base station device using the same |
JP2010504712A (en) * | 2006-09-26 | 2010-02-12 | パナソニック株式会社 | Channel quality information communication method |
JP2010035227A (en) * | 2009-11-10 | 2010-02-12 | Panasonic Corp | Radio communication device |
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US8526527B2 (en) | 2006-04-21 | 2013-09-03 | Panasonic Corporation | Radio communication apparatus and radio communication method |
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WO2024064035A3 (en) * | 2022-09-23 | 2024-05-30 | Qualcomm Incorporated | Cross bwp/cc ue sim report |
Families Citing this family (41)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7469152B2 (en) * | 2004-11-30 | 2008-12-23 | The Regents Of The University Of California | Method and apparatus for an adaptive multiple-input multiple-output (MIMO) wireless communications systems |
US8068550B2 (en) * | 2005-01-28 | 2011-11-29 | Broadcom Corporation | Initiation of a MIMO communication |
US7742444B2 (en) * | 2005-03-15 | 2010-06-22 | Qualcomm Incorporated | Multiple other sector information combining for power control in a wireless communication system |
US8750908B2 (en) * | 2005-06-16 | 2014-06-10 | Qualcomm Incorporated | Quick paging channel with reduced probability of missed page |
US9055552B2 (en) * | 2005-06-16 | 2015-06-09 | Qualcomm Incorporated | Quick paging channel with reduced probability of missed page |
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US7688788B2 (en) * | 2005-10-11 | 2010-03-30 | Microsoft Corporation | Congestion level and signal quality based estimator for bit-rate and automated load balancing for WLANS |
US20090207790A1 (en) * | 2005-10-27 | 2009-08-20 | Qualcomm Incorporated | Method and apparatus for settingtuneawaystatus in an open state in wireless communication system |
US20070097935A1 (en) * | 2005-10-27 | 2007-05-03 | Alexei Gorokhov | In-band rate control for an orthogonal frequency division multiple access communication system |
JP2009514413A (en) * | 2005-10-27 | 2009-04-02 | クゥアルコム・インコーポレイテッド | Method of maintaining a serving sector in a wireless communication system |
US20070147226A1 (en) * | 2005-10-27 | 2007-06-28 | Aamod Khandekar | Method and apparatus for achieving flexible bandwidth using variable guard bands |
US7760827B2 (en) * | 2005-11-30 | 2010-07-20 | Motorola, Inc. | Method and apparatus for improving recovery performance of time windowed signals |
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US20070153745A1 (en) * | 2006-01-04 | 2007-07-05 | Yishen Sun | System and method for link adaptation for WLAN voice transmission |
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US7627347B2 (en) * | 2006-03-17 | 2009-12-01 | Nokia Corporation | Data transmission parameter optimization in MIMO communications system |
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US7924809B2 (en) | 2006-11-22 | 2011-04-12 | Intel Corporation | Techniques to provide a channel quality indicator |
US20080239936A1 (en) * | 2007-03-28 | 2008-10-02 | Motorola, Inc. | Method and apparatus for mitigating interference in multicarrier modulation systems |
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US8767657B1 (en) * | 2011-04-19 | 2014-07-01 | Quantenna Communications Inc. | Mixed-mode MIMO detector in a local area network |
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Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20040141466A1 (en) | 2003-01-08 | 2004-07-22 | Samsung Electronics Co., Ltd. | Apparatus and method for estimating a channel condition of a forward link in a mobile communication system |
Family Cites Families (26)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU749912B2 (en) * | 1998-04-14 | 2002-07-04 | Fraunhofer-Gesellschaft Zur Forderung Der Angewandten Forschung E.V. | Frame structure and frame synchronization for multicarrier systems |
DE10012784A1 (en) * | 2000-03-16 | 2001-09-27 | Degussa | soot |
EP2259480A3 (en) * | 2000-11-20 | 2012-05-02 | Sony Deutschland Gmbh | Adaptive subcarrier loading |
US6931644B2 (en) * | 2000-12-21 | 2005-08-16 | International Business Machines Corporation | Hierarchical connected graph model for implementation of event management design |
US6731668B2 (en) * | 2001-01-05 | 2004-05-04 | Qualcomm Incorporated | Method and system for increased bandwidth efficiency in multiple input—multiple output channels |
US6751187B2 (en) * | 2001-05-17 | 2004-06-15 | Qualcomm Incorporated | Method and apparatus for processing data for transmission in a multi-channel communication system using selective channel transmission |
US6944460B2 (en) * | 2001-06-07 | 2005-09-13 | Telefonaktiebolaget L M Ericsson (Publ) | System and method for link adaptation in communication systems |
US6784439B2 (en) * | 2001-07-19 | 2004-08-31 | Ut Battelle, Llc | Thin-channel electrospray emitter |
US7164649B2 (en) * | 2001-11-02 | 2007-01-16 | Qualcomm, Incorporated | Adaptive rate control for OFDM communication system |
US6856604B2 (en) * | 2001-12-19 | 2005-02-15 | Qualcomm Incorporated | Efficient multi-cast broadcasting for packet data systems |
US7020110B2 (en) * | 2002-01-08 | 2006-03-28 | Qualcomm Incorporated | Resource allocation for MIMO-OFDM communication systems |
US7245598B2 (en) * | 2002-02-21 | 2007-07-17 | Qualcomm Incorporated | Feedback of channel quality information |
US7986672B2 (en) * | 2002-02-25 | 2011-07-26 | Qualcomm Incorporated | Method and apparatus for channel quality feedback in a wireless communication |
US7103325B1 (en) * | 2002-04-05 | 2006-09-05 | Nortel Networks Limited | Adaptive modulation and coding |
TWM240733U (en) * | 2002-08-07 | 2004-08-11 | Interdigital Tech Corp | Radio network controller for multimedia broadcast and multicast services channel switching |
US7412212B2 (en) * | 2002-10-07 | 2008-08-12 | Nokia Corporation | Communication system |
KR100517237B1 (en) * | 2002-12-09 | 2005-09-27 | 한국전자통신연구원 | Method and apparatus for channel quality estimation and link adaptation in the orthogonal frequency division multiplexing wireless communications systems |
KR100640461B1 (en) * | 2003-07-30 | 2006-10-30 | 삼성전자주식회사 | Apparatus and method for assigning sub channel in a communication system using orthogonal frequency division multiple access scheme |
RU2340104C2 (en) * | 2003-08-20 | 2008-11-27 | Мацусита Электрик Индастриал Ко., Лтд. | Wireless communication device and method of selecting sub-carriers |
US7349436B2 (en) * | 2003-09-30 | 2008-03-25 | Intel Corporation | Systems and methods for high-throughput wideband wireless local area network communications |
KR100876757B1 (en) * | 2003-10-31 | 2009-01-07 | 삼성전자주식회사 | System and method for consturcting sub channel in a communication system |
US7352819B2 (en) * | 2003-12-24 | 2008-04-01 | Intel Corporation | Multiantenna communications apparatus, methods, and system |
US20050169261A1 (en) * | 2004-02-03 | 2005-08-04 | Texas Instruments Incorporated | Method of signaling the length of OFDM WLAN packets |
US7701909B2 (en) * | 2004-02-17 | 2010-04-20 | Alcatel-Lucent Usa Inc. | Methods and devices for selecting sets of available sub-channels |
US8031686B2 (en) * | 2004-06-30 | 2011-10-04 | Neocific, Inc. | Methods and apparatus for power control in multi-carrier wireless systems |
US7272190B2 (en) * | 2004-07-07 | 2007-09-18 | Motorola, Inc. | Method and apparatus for determining channel quality and performing adaptive modulation/coding within a multicarrier communication system |
-
2005
- 2005-05-06 US US11/123,738 patent/US20060034244A1/en not_active Abandoned
- 2005-07-27 CA CA002576481A patent/CA2576481A1/en not_active Abandoned
- 2005-07-27 JP JP2007525642A patent/JP2008510374A/en not_active Withdrawn
- 2005-07-27 BR BRPI0515018-3A patent/BRPI0515018A/en not_active IP Right Cessation
- 2005-07-27 MX MX2007001709A patent/MX2007001709A/en active IP Right Grant
- 2005-07-27 WO PCT/US2005/026670 patent/WO2006020400A2/en active Search and Examination
- 2005-07-27 AU AU2005274162A patent/AU2005274162B2/en not_active Expired - Fee Related
- 2005-07-27 EP EP05781896A patent/EP1779571A4/en not_active Ceased
- 2005-07-27 KR KR1020077010443A patent/KR20070067705A/en not_active Application Discontinuation
- 2005-07-27 EP EP10152509A patent/EP2187554A1/en not_active Withdrawn
- 2005-07-27 KR KR1020077005403A patent/KR20070059086A/en not_active Application Discontinuation
- 2005-07-28 TW TW094125662A patent/TWI305094B/en not_active IP Right Cessation
- 2005-07-28 TW TW097128904A patent/TW201004195A/en unknown
- 2005-07-28 TW TW095104276A patent/TW200705872A/en unknown
-
2007
- 2007-01-29 IL IL181026A patent/IL181026A0/en unknown
- 2007-03-08 NO NO20071261A patent/NO20071261L/en not_active Application Discontinuation
-
2008
- 2008-11-13 AU AU2008243233A patent/AU2008243233A1/en not_active Abandoned
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20040141466A1 (en) | 2003-01-08 | 2004-07-22 | Samsung Electronics Co., Ltd. | Apparatus and method for estimating a channel condition of a forward link in a mobile communication system |
Cited By (22)
Publication number | Priority date | Publication date | Assignee | Title |
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WO2007109917A1 (en) * | 2006-03-24 | 2007-10-04 | Huawei Technologies Co., Ltd. | Method and system for subband indicator signalling |
CN102684839A (en) * | 2006-03-24 | 2012-09-19 | 华为技术有限公司 | Method and system for transmitting sub-band instruction |
US8526527B2 (en) | 2006-04-21 | 2013-09-03 | Panasonic Corporation | Radio communication apparatus and radio communication method |
US8792834B2 (en) | 2006-09-26 | 2014-07-29 | Panasonic Intellectual Property Corporation Of America | Communication scheme for channel quality information |
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JP2017126992A (en) * | 2006-09-26 | 2017-07-20 | オプティス ワイヤレス テクノロジー エルエルシー | User equipment and transmission method |
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WO2024064035A3 (en) * | 2022-09-23 | 2024-05-30 | Qualcomm Incorporated | Cross bwp/cc ue sim report |
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NO20071261L (en) | 2007-03-08 |
EP2187554A1 (en) | 2010-05-19 |
AU2008243233A1 (en) | 2008-12-04 |
AU2005274162A1 (en) | 2006-02-23 |
TW200705872A (en) | 2007-02-01 |
IL181026A0 (en) | 2007-07-04 |
EP1779571A2 (en) | 2007-05-02 |
EP1779571A4 (en) | 2007-12-19 |
AU2005274162B2 (en) | 2008-08-14 |
BRPI0515018A (en) | 2008-07-01 |
CA2576481A1 (en) | 2006-02-23 |
TW201004195A (en) | 2010-01-16 |
KR20070059086A (en) | 2007-06-11 |
MX2007001709A (en) | 2007-04-16 |
WO2006020400A3 (en) | 2006-12-07 |
KR20070067705A (en) | 2007-06-28 |
TW200623697A (en) | 2006-07-01 |
US20060034244A1 (en) | 2006-02-16 |
TWI305094B (en) | 2009-01-01 |
JP2008510374A (en) | 2008-04-03 |
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