WO2007015292A1 - 通信装置および無線通信システム - Google Patents
通信装置および無線通信システム Download PDFInfo
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- WO2007015292A1 WO2007015292A1 PCT/JP2005/014098 JP2005014098W WO2007015292A1 WO 2007015292 A1 WO2007015292 A1 WO 2007015292A1 JP 2005014098 W JP2005014098 W JP 2005014098W WO 2007015292 A1 WO2007015292 A1 WO 2007015292A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04L12/00—Data switching networks
- H04L12/02—Details
- H04L12/16—Arrangements for providing special services to substations
- H04L12/18—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast
- H04L12/1813—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast for computer conferences, e.g. chat rooms
- H04L12/1818—Conference organisation arrangements, e.g. handling schedules, setting up parameters needed by nodes to attend a conference, booking network resources, notifying involved parties
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- 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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- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
- H04B17/336—Signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR]
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- 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
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- H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
- H04L1/0028—Formatting
- H04L1/0029—Reduction of the amount of signalling, e.g. retention of useful signalling or differential signalling
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- H—ELECTRICITY
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- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
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- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
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- H04L1/007—Unequal error protection
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- 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
- H04L25/0228—Channel estimation using sounding signals with direct estimation from sounding signals
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- H04L67/50—Network services
- H04L67/52—Network services specially adapted for the location of the user terminal
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- 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
- H04B7/0658—Feedback reduction
- H04B7/066—Combined feedback for a number of channels, e.g. over several subcarriers like in orthogonal frequency division multiplexing [OFDM]
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- 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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- H04M3/42365—Presence services providing information on the willingness to communicate or the ability to communicate in terms of media capability or network connectivity
- H04M3/42374—Presence services providing information on the willingness to communicate or the ability to communicate in terms of media capability or network connectivity where the information is provided to a monitoring entity such as a potential calling party or a call processing server
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- H04W52/246—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters where the output power of a terminal is based on a path parameter calculated in said terminal
Definitions
- the present invention relates to a communication apparatus that performs multicarrier transmission using a plurality of frequency channels, and in particular, a communication apparatus that feeds back propagation path information of frequency channels and a radio communication system including the communication apparatus. It is about.
- a plurality of subcarriers are selected as reference subcarriers, and the remaining subcarriers are set as neighboring subcarriers associated with the reference subcarrier.
- the phase estimation value or amplitude estimation value of the reference subcarrier is fed back based on normal mapping.
- the phase estimation value or amplitude estimation value of the neighboring subcarrier is fed back based on the mapping in which the arrangement is biased in the vicinity of the phase estimation value or amplitude estimation value of the accompanying reference subcarrier.
- the base station controls the transmission antenna weight at the next transmission using the phase estimation value or the amplitude estimation value fed back to the terminal power (see Patent Document 1).
- Patent Document 1 Japanese Patent Laid-Open No. 2003-87070 FIG. 4 Disclosure of the invention
- the estimation error of the phase Z amplitude estimation value of the reference subcarrier also affects the mapping of the phase Z amplitude estimation value of the neighboring subcarriers.
- the quality of the reference subcarrier amplitude, signal-to-noise ratio, etc.
- the transmission diversity performance of nearby subcarriers deteriorates beyond that of the reference subcarrier alone. was there.
- the present invention has been made in view of the above, and in a multicarrier transmission system, does not increase the amount of feedback information between a transmitter and a receiver. It is an object of the present invention to provide a communication apparatus capable of improving the accuracy of feedback channel information that is affected by the quality degradation of other frequency channels.
- a communication apparatus is a communication apparatus on the receiving side that performs multicarrier transmission using a plurality of frequency channels,
- the plurality of frequency channels are configured such that a plurality of layers including a plurality of frequency channels are configured, and the number of frequency channels included in each layer group is smaller than the number of frequency channels included in the group of the next higher layer.
- Grouping control means for performing control for hierarchical grouping, propagation path information estimation means for estimating propagation path information of the plurality of frequency channels, and control of the grouping control means
- Frequency channels are grouped hierarchically, and at the highest layer, an average value of the channel information for each group is calculated using the channel information estimation value, and the average value is calculated.
- the channel information estimation value used in each layer is calculated based on the average value of the layer one level above, and the channel information estimation value for each group is calculated using the channel information estimation value in each layer.
- Mean value calculating means for calculating an average value and feedback means for feeding back the average value obtained in each group as feedback information to the communication device on the transmission side are provided.
- the communication device calculates the average value of the propagation path information for each group in each layer, for example, from the propagation path information estimated value of the layer above and the average value of the layer above It was decided to.
- the channel information estimated value is quantized as it is, it is possible to realize the same or higher quantization accuracy with a smaller number of quantization bits, and thus to realize a high speed feedback loop by reducing the amount of information.
- the channel information estimation value is averaged for each group, for example, the quality of a specific channel is poor. Even when the estimation accuracy is deteriorated, the influence is dispersed and the feedback of the estimated value can be realized with high accuracy.
- FIG. 1 is a diagram showing a configuration example of a first embodiment of a communication device according to the present invention.
- FIG. 2 is a flowchart showing a process flow of the first embodiment.
- FIG. 4 is a schematic diagram of each average value calculated by the process of FIG.
- FIG. 5 is a diagram showing a configuration example of a second embodiment of a communication device according to the present invention.
- FIG. 6 is a diagram illustrating an example of specific processing of a feedback information generation unit in the communication apparatus of Embodiment 2.
- FIG. 7 is a diagram showing a configuration example of a third embodiment of a communication apparatus according to the present invention.
- FIG. 8 is a diagram illustrating an example of specific processing of the communication apparatus according to the third embodiment.
- FIG. 9 is a diagram showing a configuration example of a fourth embodiment of the communication device according to the present invention.
- FIG. 10 is a diagram showing a configuration example of a communication apparatus according to a fifth embodiment of the present invention.
- FIG. 11 is a diagram showing a configuration example of a sixth embodiment of a communication apparatus according to the present invention.
- FIG. 12 is a diagram showing a configuration example of a feedback information generation unit in the communication apparatus according to the present invention.
- FIG. 13 is a diagram showing a configuration example of a transmission processing unit in the communication apparatus according to the present invention.
- FIG. 14 is a diagram showing a configuration example of a transmission processing unit in the communication apparatus according to the present invention.
- FIG. 15 is a diagram illustrating a configuration example of a MIMO transmission / reception system.
- FIG. 16 is a diagram illustrating a configuration example of an eigenbeam MIMO transmission system.
- FIG. 1 is a diagram showing a configuration example of a communication apparatus according to the present invention.
- This communication apparatus performs multi-carrier transmission (for example, OFDM scheme, etc.) and, for example, propagation path information for estimating propagation path information based on received signals S1—1, S1 ⁇ 2,.
- Estimating unit 1 frequency channel group generating unit 2 that gives instructions for hierarchical grouping of subcarriers, and propagation path information estimated values S2—1, S2-2,..., S2—n or subtraction Part outputs S5—1, S5—2,..., S5—3 output selector 3 and selector outputs S3—1, S3—2,.
- n is a number for identifying each subcarrier in multicarrier communication.
- the propagation path information estimation unit 1 estimates the propagation path information using the received signals SI-1 to S1-n decomposed in subcarrier units, and the propagation path information estimated values S2-1 to S2 for each subcarrier. — Outputs n.
- the estimated propagation path information estimated values S2-1 to S2—n are input to the selector 3, and the subtraction unit outputs S5-1 to S5—n from the subtraction unit 5 are also input to the selector 3.
- the selector 3 selects either one of the propagation path information estimated values S2-1 to S2—n or the subtraction unit outputs S5—1 to S5—n and outputs the selector output.
- the selector outputs 33-1 to 33-11 are input to the average value calculation unit 4.
- the selector outputs S3-1—S3—n are hierarchically grouped based on the instructions of the frequency channel group generation unit 2. And calculate the average value S4 for each group.
- the subtraction unit 5 that receives the average value S4 calculated by the average value calculation unit 4 subtracts the average value S4 corresponding to the subcarrier branch numbers l to n from the selector outputs S3-1—S3—n, and The result is output as the subtraction unit S5-1—S5—n.
- the feedback information generation unit 6 generates and outputs feedback information S6 using the average value S4.
- frequency channel group generation section 2 gives an instruction to group subcarriers hierarchically.
- the highest layer is composed of a single group including all subcarriers
- the next layer is the number of subcarriers included in each group existing in that layer. It should be less than the number of subcarriers included. That is, according to the instruction from the frequency channel group generation unit 2, the subcarriers are hierarchically divided and grouped until the number of subcarriers included in each group is equal to or less than a predetermined value.
- the selector 3 first outputs the propagation path information estimated values S2-1—S2—n according to the instruction of the frequency channel group generation unit 2, and then outputs the subtraction unit outputs S5-1—S5—n. Is output. Also, the average value calculation unit 4 calculates the average value for each subcarrier group in order from the highest layer to the lowest layer according to the instruction from the frequency channel group generation unit 2. These operations are executed each time the propagation path information estimated values S2-1 to S2-1 are updated.
- Fig. 2 is a flowchart showing the flow of processing.
- the channel information estimation unit 1, the frequency channel group generation unit 2, the selector 3, the average value calculation unit 4, and the subtraction unit 5 operate in cooperation with each other. The following processing is performed in order from the highest hierarchy.
- the propagation path information estimation unit 1 uses the received signals SI-1 to S1-n to generate each subcarrier.
- the channel information estimated for each subcarrier is output (step Sl).
- selector 3 selects channel information estimated values S2-1—S2—n and selects the selector output S3 as the selection result.
- — 1 to S 3— n is output to the average value calculation unit 4 (step S3).
- the average value calculation unit 4 calculates the average value of the selector outputs S3—l to S3—n of each subcarrier in the group in the group of the highest layer (step S4).
- the subtracting unit 5 subtracts the average value S4 from the selector outputs S3-1—S3—n, and outputs the resulting subtractor outputs S5-1—S5-n to the selector 3 ( Step S5, No, Step S 6).
- the selector 3 next selects the subtraction unit outputs S5—l to S5-n in the hierarchy (step S2, No), and the selector outputs S3-1 to S3— that are the selection results. n is output to the average value calculation unit 4 (step S7).
- the average value calculation unit 4 calculates the average value of the selector outputs S3-1 to S3-n of each subcarrier in each group of this hierarchy (step S4). Thereafter, the above steps S6, S7, S4 are repeatedly executed until the lowest layer is reached (step S5, Yes).
- step S5 when the average value calculation in the lowest layer is completed (step S5, Yes), the average value calculation unit 4 outputs the average value S4 of each group in each layer to the feedback information generation unit 6 (Step S8). Finally, the feedback information generation unit 6 generates feedback information S6 from the received average value S4 and outputs it (step S9).
- the communication device on the receiving side executes the above processing (steps S2 to S9) each time the propagation path information estimated values S2-1-S2-n are updated, and the feedback information S6 obtained by the above processing is obtained. Feedback to the communication device on the transmission side. Further, in the communication device on the transmission side that has received the feedback information S6, by using a procedure opposite to the procedure for calculating the average value described above, the propagation path information estimated value S2— of each subcarrier in the communication device on the reception side is used. 1 to S2—n are obtained. By using this propagation path information estimated value, transmission diversity and eigenbeam MIMO transmission can be realized.
- the number of subcarriers n is set to a power of 2 for the sake of easy understanding. .
- the number of subcarriers n is not limited to a power of two.
- the propagation path information estimation unit 1 estimates a propagation channel response, for example.
- the propagation path information estimated values S2-1 to S2-1 at time k and the vector h (k) are expressed as the following equation (1).
- h (k) [h (k), h (k),-, h (k),]-(1)
- h (k) corresponds to the channel information estimate S2-1 of the first subcarrier
- the propagation path information estimated value S2-i for the i-th (l ⁇ i ⁇ n) subcarrier is expressed as SC (i).
- SC subcarrier group in the first hierarchy
- m Indicates the number of a layer that increases by 1 as it goes down, and m indicates the number of a subcarrier group configured in layer 1.
- the first hierarchy (the highest level) handles all subcarriers as one subcarrier group as shown in the following equation (2).
- the first hierarchy divides all subcarriers into 2 1 — 1 groups as shown in the following formula (4), and finally, the lowest hierarchy has 1 subcarrier. Divide into 1 group.
- Average value calculation unit 4 calculates the average value of channel coefficients in subcarrier group SCG (1, m), and subtraction unit 5 calculates the average value of the subcarrier group in the next higher hierarchy. Subtraction is performed, and the subtraction result is defined as the channel coefficient average value of SCG (1, m), h (l, m)> (k).
- the channel coefficient average value of SCG (1, m) is expressed as the following equation (5).
- ⁇ h (l, m)> (k) obtained as described above is fed back to the communication device on the transmission side as a propagation path estimated value at time k.
- the communication device on the transmitting side reconstructs the propagation path information estimated value by calculating the feedback ⁇ h (l, m)> (k) in the reverse procedure to that described above. Transmit diversity uses eigenbeam M IMO transmission.
- SI-1 to S1-8 shown in the figure are received signals
- S2-1 to S2-8 are propagation path information estimated values of the highest layer
- S5-la to S5-8a are the second ones.
- Average value of the first group in the upper hierarchy (average value S4—la is the average value of the first group of the second layer (corresponding to the average value S4)
- S4—2a is the average value of the second group of the second layer (average value)
- S4—lb is the average value of the first group in the third layer (corresponding to the average value S4)
- S4—2b is the average value of the second group in the third layer (average value)
- S4-3b is the average value of the third group in the third layer (corresponding to the average value S4)
- S4-4b is the average value of the fourth group in the third layer ( Equivalent to the average value S4).
- the propagation path information estimation unit 1 estimates the propagation path information from the received signals S1-1 to S1-8, Propagation path information estimated values S2-1 to S2-8 are output.
- the first layer one group including all eight subcarriers (first layer, first group) is generated, and the average value calculation unit 4 calculates the average value S4-1 of the propagation path information estimated values of this group. Calculate and output.
- the average value S4-1 of the first layer and the first group is input to the feedback information generation unit 6 and the subtraction unit 5.
- the subtracting unit 5 starts from the channel information estimated values S2-1 to S2-8 of the first layer to the first group of the first group.
- the average value S4-1 is subtracted, and the result is output as the second-layer propagation path information estimated values S5-la to S5-8a.
- two groups each including four subcarriers are generated.
- the second layer, the first group includes the second layer propagation path information estimated values S5—la to S5—4a, and the second layer
- the second layer of the hierarchy includes second layer propagation path information estimated values S5-5a to S5-8a.
- the average value calculation unit 4 calculates the average value of each group (the average value S4 ⁇ la of the second layer and the first group and the average value S4 ⁇ 2a of the second layer and the second group), and feeds back the results. Output to the information generator 6 and the subtractor 5.
- the subtraction unit 5 performs the second-layer propagation path information estimation values S5—la to S5—4a to the second hierarchy first group.
- the average value S4—la is subtracted, and the result is output as the third layer propagation path information estimated values S5—lb to S5—4b.
- the average value S4-2a of the second layer and the second group is subtracted from the second layer propagation path information estimated values S5-5a to S5-8a, and the result is obtained as the third layer propagation path information estimated value S5. — 5b to S5— Output as 8b.
- the third layer four groups each including two subcarriers are generated, and the first layer in the third layer is the channel information estimated value of the third layer S5—lb, S5-2b 3rd layer 2nd group includes 3rd layer propagation path information estimated values S5-3b, S5-4b, 3rd layer 3rd group 3rd layer propagation path information estimated values S5-5b, S5 — Including 6b, 3rd layer 4th group includes 3rd layer propagation path information estimates S5-7b, S5-8b.
- the average value calculation unit 4 calculates the average value of each group (average value S4—lb of the third layer, first group, average value S4—2b of the third layer, second group, average of the third layer, third group) Value S4-3b, average value S4-4b) of the third layer and the fourth group is calculated, and the result is output to the feedback information generation unit 6 and the subtraction unit 5.
- the subtracting unit 5 performs the propagation path information estimated values S5—lb, S5-2b of the third layer to the first group of the third layer.
- the average value S4—lb is subtracted, and the result is output as the fourth-layer propagation path information estimated values S5—lc, S5-2—c.
- the average value S4-2b of the third layer, second group is subtracted from the third layer propagation path information estimated values S5-3b, S5-4b, and the result is obtained as the fourth layer propagation path information estimated value S5. — Output as 3c, S5-4c.
- the average value S4-3b of the third layer third group is subtracted from the third layer propagation path information estimated values S5-5b and S5-6b, and the result is obtained as the fourth layer propagation path information estimated value S5— 5c, S5—Output as 6c.
- the average value S4-4b of the third layer and the fourth group is subtracted from the third layer propagation path information estimated value S5-7b, S5—8b, and the result is obtained as the fourth layer propagation path information estimated value S5— 7c, S5—Output as 8c.
- the propagation path information estimated values S5-lc to S5-8c in the fourth layer are average values (corresponding to S4 output by the subtracting unit 5 shown in FIG. 1). ) Is output to the feedback information generator 6.
- FIG. 3 in order to explain the calculation procedure in an easy-to-understand manner, a series of loop processes by the cooperative operation of the selector 3, the average value calculation unit 4, and the subtraction unit 5 are shown in an expanded manner. However, it may be configured by a circuit that is actually developed. Although not shown, the selector 3 and the average value calculation unit 4 perform processing based on instructions from the frequency channel group generation unit 2.
- FIG. 4 is a schematic diagram of each average value calculated in the process of FIG.
- the propagation path information estimated values 32-1 to 32-8 are average values S4-1 (corresponding to ⁇ h (l, 1)> in the figure) in each layer.
- the present invention can be applied regardless of the coordinate method such as complex number display and polar coordinate display.
- the average value calculation procedure shown above may be applied independently to the in-phase component (I-ch) and quadrature component (Q-ch). It is also possible to apply only to either one and feed back the estimated value as it is for the other.
- the average value calculation procedure described above may be applied independently to each of the absolute value component and the angle component of the amplitude. Apply only to one, and feed back the estimated value for the other.
- the power described in the case of using propagation path information estimation values of all subcarriers is selected and selected from some representative subcarriers that are not limited to this.
- a channel estimation value may be acquired for each subcarrier, and the averaging process may be performed on the acquired channel estimation value.
- Such a case is assumed when there is a large correlation of propagation path information with surrounding subcarriers where the frequency band per subcarrier is narrow, and in this case, it is particularly a method for reducing the amount of feedback information. Useful.
- the highest layer (first layer) group includes all subcarriers.
- the uppermost layer is not necessarily limited to this. May be divided into multiple groups. The grouping method is appropriately selected according to the condition of the propagation path and the allowable amount of feedback information.
- the average value in each layer is also calculated by calculating the differential force between the channel information estimated value in the next higher layer and the average value in the next higher layer. . to this Therefore, compared to the case where the channel information estimation value is quantized as it is, it is possible to achieve the same or higher quantization accuracy with a smaller number of quantization bits, and the feedback loop speed can be increased by reducing the amount of information. Can be realized.
- the propagation path information estimation values of all subcarriers are averaged in the present embodiment, for example, the quality of a specific subcarrier is deteriorated. Even when the estimation accuracy is degraded, the effect is dispersed, and the estimation accuracy is not degraded over all subcarriers as in the conventional example, and feedback of the estimated value can be realized with high accuracy.
- FIG. 5 is a diagram illustrating a configuration example of the communication device according to the second embodiment of the present invention.
- the communication device includes a feedback information generation unit 11 instead of the feedback information generation unit 6 according to the first embodiment described above. Yes.
- the same components as those in FIG. 1 of the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.
- the operation of feedback information generation section 11 that is different from the first embodiment will be described.
- the time variation of the average value calculated in the first embodiment described above becomes more gradual as the number of subcarriers to be averaged is larger, that is, as the average value of the upper layer is higher. Therefore, in the present embodiment, the feedback information generation unit 11 changes the period for feeding back the average value according to the hierarchy for calculating the average value, and the longer the feedback period is for the higher hierarchy. This makes it possible to further reduce the amount of information necessary for feedback without degrading the accuracy of the channel information estimated value to be fed back.
- FIG. 6 is a diagram illustrating an example of specific processing of the feedback information generation unit 11 in the communication device according to the second embodiment.
- the case where the number of subcarriers is n is shown.
- the horizontal axis represents time, and at each time, the average value of the group indicated by the black square is fed back, and the average value of the group indicated by the open square is not fed back. That is, in the present embodiment, the feedback information generating unit 1 1 Power The average value S4-1 of the first layer, first group is fed back at time k, k + 4, k + 8.
- the average value of the second layer is S4—la, S4—2a [Kot! / Tetsu, until Ijk, k + 2, k + 4, k + 6, k + 8.
- the average values of S4—lb, S4-2b, S4-3b, S4—4b are fed back at all times (k, k + 1, ..., k + 7, k + 8). .
- the range of time k to k + 8 is shown, but feedback is performed at the same period at times before and after that.
- the feedback period is set longer as the average value of the upper layer.
- the same effects as those of the first embodiment described above can be obtained, and further, the amount of feedback information can be further reduced, so that a further high-speed feedback loop can be realized by reducing the amount of information.
- FIG. 7 is a diagram illustrating a configuration example of the communication device according to the third embodiment of the present invention.
- frequency channel duplication selection Z generation Part 12 is provided instead of the frequency channel group generation unit 2 of the above-described second embodiment. Note that the same components as those in FIG. 5 of the second embodiment described above are denoted by the same reference numerals and description thereof is omitted. Here, the operation of the frequency channel group selection Z generation unit 12, which is different from the second embodiment, will be described.
- the period for feeding back the average value is changed according to the hierarchy for calculating the average value, and the feedback period is set for the higher layer. Take longer. Furthermore, in the present embodiment, when there are a plurality of groups in a specific hierarchy, the average value of all the groups in the hierarchy is not fed back simultaneously, but the frequency channel group selection Z generator 12 and the feedback information generator 1 Under the control of 1, perform processing to send at different times for each group and processing to send by thinning. This As a result, the amount of feedback information is further reduced.
- FIG. 8 is a diagram illustrating an example of specific processing of the communication apparatus according to the third embodiment.
- n the number of subcarriers is shown.
- the horizontal axis represents time, and at each time, the average value of the group indicated by the black square is fed back, and the average value of the group indicated by the open square is not fed back. That is, in the present embodiment, the average value S4-1 of the first layer and the first group is fed back at times k, k + 4, and k + 8, as described above.
- the average values S4 ⁇ la and S4 ⁇ 2 of the second layer are alternately fed back so that the feedback times do not overlap under the control of the frequency channel group selection Z generator 12 and the feedback information generator 11. For example, the average value S4 ⁇ la is fed back at time k, k + 4, k + 8, and the average value S4 ⁇ 2a is fed back at time k + 2, k + 6.
- the average value of the third layer S4—lb, S4-2b, S4-3b, S4—4b [Even though the average value is controlled by the frequency channel group selection Z generator 12 and feedback information generator 11]
- the average values S4—lb, S4—3b are feed knocked at time k, k + 2, k + 4, k + 6, k + 8, and average values S4—2b, S4 — 4b is fed back at time k + 1, k + 3, k + 5, k + 7.
- the force indicating the range of time k to k + 8 is also fed back at the same period at the time before and after that.
- the power that requires the average value of the upper hierarchy in order to calculate the average value of the specific hierarchy As in Form 2, the latest average value fed back last is used.
- the average value S4—lb of the third layer and the first group at the time k + 3 when calculating the average value S4—lb of the third layer and the first group at the time k + 3, the average value S4—1 of the first layer and the first group at the time k is calculated.
- the average value S4-2a of the second layer and the second group at the time k + 2 is used.
- the propagation path information of the subcarrier for which the average value of the lowest layer is not sent is It cannot be rebuilt as it is.
- the average values S4—lb, S4—3b are fed back, and the propagation path information of the first and third subcarriers can be reconstructed.
- 2b, S4—4b is fed back to V, so the channel information of the second and fourth subcarriers cannot be reconstructed. Therefore, in this embodiment, even in such a case, reconstruction is possible by performing interpolation processing.
- the average value S4-2b can be obtained by interpolation from the average values S4—lb and S4-3b, and the average value S4-4b can be obtained by extrapolation. Further, such interpolation processing can be applied not only to the lowest layer but also to the intermediate layer. By performing the above interpolation processing, the transmission path information can be reconstructed on the transmission side even when the average value fed back by the communication device on the reception side is thinned out.
- the average value of all the groups is not obtained at the same time and fed back, but the time is shifted and fed back.
- the same effect as in the first embodiment can be obtained, and the amount of feedback information can be further reduced as compared with the second embodiment.
- FIG. 9 is a diagram illustrating a configuration example of the communication device according to the fourth embodiment of the present invention.
- the time direction for calculating the average value S11 in the time direction is further illustrated.
- a directional averaging unit 13 is provided. Note that the same components as those in FIG. 1 of the first embodiment described above are denoted by the same reference numerals and description thereof is omitted. Here, the operation of time direction averaging section 13 that is different from the first embodiment will be described.
- the time direction averaging unit 13 averages the received average value in the time direction for each group, and outputs the average value S11 as a result to the feedback information generating unit 6.
- Time direction As the averaging method, cyclic addition, moving average, FIR filter, IIR filter, or a combination of these methods are used.
- the forgetting factor of cyclic addition, the moving average length, the tap length and tap coefficient of the FIRZIIR filter may be adaptively changed according to environmental changes such as the propagation speed of the propagation path, etc. If not required, no change is required.
- the averaging in the time direction improves the signal-to-noise ratio of the propagation path information estimated value, and the time variation due to the averaging effect becomes slow, so the period for transmitting feedback information can be lengthened. As a result, feedback control can be performed with a smaller amount of information.
- the received average value is further averaged in the time direction for each group. As a result, it is possible to further improve the estimation accuracy of the propagation path information estimated value, and to enable more accurate feedback control.
- the averaging process in the time direction is applied to the configuration of the first embodiment.
- the present invention is not limited to this, and the configuration of the second or third embodiment is used. It is also possible to apply to.
- FIG. 10 is a diagram showing a configuration example of Embodiment 5 of the communication apparatus according to the present invention.
- the time direction difference for calculating the time direction difference value S12 is also shown.
- a calculation unit 14 is provided. Note that the same components as those in FIG. 1 of the first embodiment described above are denoted by the same reference numerals and description thereof is omitted. Here, the operation of the time direction difference calculation unit 14, which is different from the first embodiment, will be described.
- the time direction difference calculation unit 14 calculates the difference between the previous average value and the current average value for each group average value. Then, the calculated difference value S 12 is output to the feedback information generation unit 6. By using the average time difference as feedback information, The amount of information necessary for feedback can be further reduced.
- the difference between the average values is used as feedback information.
- the amount of feedback information can be further reduced, and as a result, a further high-speed feedback loop can be realized.
- the force applied to apply the time direction difference calculation process to the configuration of the first embodiment is not limited to this, and the configuration of the second or third embodiment. It is also possible to apply it to the composition.
- FIG. 11 is a diagram illustrating a configuration example of the sixth embodiment of the communication device according to the present invention, and controls the frequency channel group generation unit 16 and the feedback information generation unit 17 based on the transmission path fluctuation speed information. Part 15 is provided. Note that the same components as those in FIG. 1 of the first embodiment described above are denoted by the same reference numerals and description thereof is omitted. Here, operations of control unit 15, frequency channel group generation unit 16, and feedback information generation unit 17 that are different from those of the first embodiment will be described.
- the transmission path fluctuation speed information is a signal indicating the speed of time fluctuation of the transmission path and the spread of the multipath in the time direction. Specifically, information related to time fluctuations of the transmission line such as the moving speed of the terminal and Doppler shift frequency, information indicating the state of the multipath transmission line such as delay spread and delay profile, and these values are used as indicators. Can be used.
- the control unit 15 is configured to divide each layer into groups, the number of subcarriers included in each group, the number of layers, and the feedback period (can be set for each layer). ) And adaptively control the combination of subcarriers used for processing. For example, when the time fluctuation of the transmission path is moderate, the time change of the transmission path estimation value of each subcarrier also becomes gentle, so a large feedback cycle is taken. As a result, the amount of feedback information can be reduced. In the opposite case, the feedback cycle is shortened. As a result, feedback control can be made to follow transmission path fluctuations. In addition, when the delay thread is small, the fluctuation in the frequency direction is small, that is, adjacent to each other. Since the correlation between subcarriers increases, the number of subcarriers that feed back transmission path information is reduced. Conversely, if the delay spread is large, the number of subcarriers that feed back transmission path information is increased.
- control unit 15 selects an optimum feedback method according to the state of the propagation path. As a result, the same effects as those of the first embodiment described above can be obtained, and further reduction of the feedback information amount and high speed feedback can be realized.
- the force that adaptive control by the control unit is applied to the configuration of the first embodiment is not limited to this, and the second, third, fourth, or fifth embodiments. It is also possible to apply to this configuration. As a result, the amount of feedback information can be further reduced and the feedback high speed key can be realized.
- the feedback information generation unit in Embodiments 1 to 6 described above changes the capability of the error correction code depending on the hierarchy to which the input average value belongs.
- FIG. 12 is a diagram showing a configuration example of a feedback information generation unit in the communication apparatus according to the present invention.
- the feedback information generation unit includes a control unit 21, a selector 22, and an error correction encoder 23.
- S4-1 is the average value of the first group of the first layer
- S4-la is the average value of the first group of the second layer
- S4-2a is the average value of the second group of the second layer.
- S4—lb is the average value of the first group of the third layer
- S4—2b is the average value of the second layer of the third layer
- S4—3b is the average value of the third group of the third layer
- S4 -4b is the average value of the 4th group in the third layer
- S21 is the selector control signal
- S22 is the error correction encoder control signal.
- the feedback information generation unit of the present embodiment adaptively changes the error correction code capability according to the hierarchy to which the input average value belongs. Improve error resilience at the time of feedback by performing a sign with an appropriate correction capability according to the hierarchy, Reduce the amount of information required and achieve high-speed feedback loop operation. For example, since the average value of the upper layer is related to the propagation path information estimation value of all subcarriers, if this average value is incorrect at the time of feedback, the error affects all subcarriers. Therefore, in the present embodiment, encoding with higher error correction capability is performed for the average value of the upper layer. Thereby, the error of the average value of an upper hierarchy can be reduced.
- a code having an appropriate error correction capability is executed for each layer. This makes it possible to improve the error tolerance capability during feedback, reduce the amount of information required for feedback, and operate the feedback loop at high speed.
- FIG. 13 is a diagram showing a configuration example of a transmission processing unit in the communication apparatus according to the present invention, and includes a modulation unit 31, an amplitude setting unit 32, a multiplication unit 33, and a transmission unit 34.
- Modulator 31 performs predetermined modulation mapping on the feedback information output from the feedback information generators of Embodiments 1 to 7 described above, and outputs the result to multiplier 33.
- the amplitude setting unit 32 sets a weight for performing feedback transmission for each piece of feedback information.
- the multiplier 33 multiplies the modulated signal by the weight output from the amplitude setting unit 32 and outputs the result to the transmission unit 34.
- the transmission unit 34 performs predetermined transmission processing (amplification, frequency conversion, filter, etc.) on the input signal and transmits it.
- the amplitude setting unit 32 performs transmission power increase / decrease processing according to the importance of the individual feedback information. For example, since the channel information estimation values of a large number of subcarriers are reconstructed from the average value of the group in the upper layer, it is important that the upper layer does not contain errors during feedback. Therefore, in the present embodiment, the amplitude setting unit 32 increases the transmission power for the higher-layer feedback information, while reducing the transmission power for the lower-layer feedback information. Na To control each.
- transmission power is appropriately controlled for each layer.
- the error tolerance of feedback information is improved, so that the amount of information required for feedback can be reduced and the feedback loop can be operated at high speed.
- communication methods using the feed knock loop (such as transmission diversity or MIMO transmission) can be realized. Improve quality.
- FIG. 14 is a diagram showing a configuration example of a transmission processing unit in the communication apparatus according to the present invention.
- a code multiplexing unit 41 is further provided.
- the code multiplexing unit 41 which is different in operation from the above-described eighth embodiment, will be described.
- Code multiplexing section 41 outputs to transmitter 34 the result of multiplexing feedback information corresponding to each average value with a spreading code.
- the spreading rate of each feedback information may be the same, or the error resilience capability of each feedback information may be controlled by changing the spreading rate.
- transmission power is controlled in the same manner as in Embodiment 8, and the spreading factor is appropriately controlled for each layer in the code multiplexing unit.
- error tolerance of feedback information is further improved, so that further reduction of feedback information amount and high-speed operation of the feedback loop can be realized.
- FIG. 15 is a diagram illustrating a configuration example of a MIMO transmission / reception system including the communication apparatus according to the present invention (corresponding to the communication apparatuses of Embodiments 1 to 9).
- This MIMO transmission / reception system is composed of a transmitter 61 having transmission antennas 62 and 63, and a receiver 66 having the functions of Embodiments 1 to 9 described above and receiving antennas 64 and 65.
- Each device communicates via propagation paths 71, 72, 73, 74.
- the propagation path 71 represents the propagation path between the transmission antenna 62 and the reception antenna 64
- the propagation path 72 represents the transmission antenna 62 and the reception antenna.
- the number of transmitting and receiving antennas that describe two MIMO transmission / reception systems for both transmitting and receiving antennas is not limited to this value for ease of explanation.
- the functions of the communication device of Embodiment 1 can be easily extended to a MIMO transmission / reception system. That is, in the example of FIG. 15, the function of the communication device described in the first embodiment corresponding to the propagation paths 71, 72, 73, 74 is included in the receiver 66.
- the power of realizing a MIMO transmission / reception system using the communication apparatus described in Embodiment 1 is not limited to this, and other embodiments As a MIMO transmission / reception system using the communication device described in the form.
- the MIMO transmission / reception system is configured using the functions of the communication apparatuses of Embodiments 1 to 9 described above.
- the effect of reducing the amount of feedback information can be easily applied to MIMO transmission / reception systems.Therefore, especially when forming a MIMO channel with a large number of propagation paths, the amount of feedback information is reduced and the feedback loop is fast. Operation.
- FIG. 16 is a diagram illustrating a configuration example of an eigenbeam MIMO transmission system.
- the communication device on the transmission side includes a modulation unit 81, a transmission weight control unit 82, and transmission antennas 83-1 to 83-m.
- the communication device on the receiving side propagates using the receiving antennas 911-1 to 91n, the reception weight control unit 92, the demodulation unit 93, and the functions of the first to ninth embodiments.
- a propagation path information estimation unit 94 that feeds back the path information, and SVD95.
- S31-1 to S31-m are transmission signals
- 101 is a MIMO transmission path
- S32-1 to S32-n are reception signals
- S33 is a left singular matrix
- S34 is a right signal.
- a different matrix, S35 is a diagonal matrix.
- SVD95 performs singular value decomposition on the matrix formed from the channel response estimation value output from the propagation path information estimation unit 94 of the communication device on the receiving side, and the result is obtained.
- the left singular matrix S33, the right singular matrix S34, and the diagonal matrix S35 are used as propagation path information estimated values.
- propagation path information estimation section 94 estimates the channel response of MIMO propagation path 101, and as a result, forms a propagation path information estimated value matrix.
- the size of the matrix is n rows and m columns.
- a left singular value matrix S33, a right singular value matrix S34, and a diagonal matrix S35 are obtained.
- the left singular value matrix S33 determines the operation of the reception weight control unit 92
- the right characteristic value matrix S34 determines the operation of the transmission weight control unit 82.
- the reception weight control unit 92 and the transmission weight control unit 82 operate so as to form a plurality of eigen beams between transmission and reception. Since the diagonal matrix S35 represents the quality for each eigenbeam, each communication apparatus performs adaptive modulation / demodulation for each eigenbeam based on the diagonal matrix S35.
- the number of transmission path information to be estimated is the product of the number m of transmitting antennas and the number n of receiving antennas. Therefore, the communication shown in Embodiment 1 Prepare only mn communication devices, calculate feedback information for each transmission line information, and feed-knock. As the number of transmission antennas m and the number of reception antennas n increases, the number of transmission path information to be estimated increases, but the amount of feedback information can be reduced by applying Embodiment 1, so a feedback loop is created. It can be operated at high speed, and the eigenbeam MIMO transmission system can follow the fluctuations in the transmission path.
- the amount of feedback information in eigenbeam MIMO transmission can be reduced by the above processing, so that the ratio of control information to high-speed feedback operation and communication capacity can be reduced. As a result, the communication capacity can be increased.
- the communication apparatus according to the present invention is useful for a wireless communication system that performs multicarrier transmission.
- the communication apparatus on the reception side has a frequency channel higher than that on the transmission side. It is suitable for a wireless communication system that feeds back propagation path information.
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CN2005800510959A CN101223718B (zh) | 2005-08-02 | 2005-08-02 | 通信装置及无线通信系统 |
DE602005027618T DE602005027618D1 (de) | 2005-08-02 | 2005-08-02 | Kommunikationseinrichtung und funkkommunikationssystem |
JP2007529148A JP4460605B2 (ja) | 2005-08-02 | 2005-08-02 | 通信装置および無線通信システム |
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Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2008041632A1 (fr) * | 2006-10-04 | 2008-04-10 | Sharp Kabushiki Kaisha | Dispositif de génération d'informations de rapport, dispositif de communication, procédé de génération d'informations de communication, et programme de génération d'informations de communication |
WO2009088336A1 (en) * | 2008-01-11 | 2009-07-16 | Telefonaktiebolaget L M Ericsson (Publ) | Feedback with unequal error protection |
US20100054356A1 (en) * | 2008-09-01 | 2010-03-04 | Keerthi Arvind V | Interference avoiding mimo |
JP2014515907A (ja) * | 2011-04-21 | 2014-07-03 | ゼットティーイー コーポレイション | 多重入出力(mimo)のための空間チャネル状態情報のフィードバック方法およびシステム |
JP2014195144A (ja) * | 2013-03-28 | 2014-10-09 | Softbank Mobile Corp | マルチユーザmimoシステムにおけるフィードバック情報の制御方法、及びマルチユーザmimoシステムの移動局及び基地局 |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7817735B2 (en) * | 2006-01-11 | 2010-10-19 | Amicus Wireless Technology Ltd. | Device and method of performing channel estimation for OFDM-based wireless communication system |
JP2008288990A (ja) * | 2007-05-18 | 2008-11-27 | Tektronix Japan Ltd | 伝搬路状態評価装置及び方法 |
JP5153781B2 (ja) * | 2007-10-25 | 2013-02-27 | シャープ株式会社 | 通信装置、マルチキャリア通信システムおよび通信方法 |
US8094761B2 (en) * | 2007-12-07 | 2012-01-10 | Samsung Electronics Co., Ltd. | Uplink feedback for supporting MIMO operation in the LTE downlink |
WO2012170530A1 (en) | 2011-06-07 | 2012-12-13 | Marvel World Trade Ltd. | Systems and methods for compressed feedback and subcarrier grouping for beamforming |
US9083769B2 (en) | 2011-09-14 | 2015-07-14 | Barco N.V. | Electronic tool and methods for meetings |
CN103931175B (zh) | 2011-09-14 | 2018-04-20 | 巴科股份有限公司 | 用于会议音频的电子工具和方法 |
US8756348B2 (en) | 2011-09-14 | 2014-06-17 | Barco N.V. | Electronic tool and methods for meetings |
US10050800B2 (en) | 2011-09-14 | 2018-08-14 | Barco N.V. | Electronic tool and methods for meetings for providing connection to a communications network |
US10965480B2 (en) | 2011-09-14 | 2021-03-30 | Barco N.V. | Electronic tool and methods for recording a meeting |
US11258676B2 (en) | 2011-09-14 | 2022-02-22 | Barco N.V. | Electronic tool and methods for meetings |
JP7136206B2 (ja) * | 2018-07-24 | 2022-09-13 | 日本電気株式会社 | 校正制御装置 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2003087070A (ja) | 2001-09-06 | 2003-03-20 | Ntt Docomo Inc | 送信機および受信機 |
JP2003169036A (ja) * | 2001-11-30 | 2003-06-13 | Japan Telecom Co Ltd | 直交周波数分割多重システムおよび送受信装置 |
JP2004104293A (ja) * | 2002-09-06 | 2004-04-02 | Mitsubishi Electric Corp | 再送制御方法および通信装置 |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6473467B1 (en) | 2000-03-22 | 2002-10-29 | Qualcomm Incorporated | Method and apparatus for measuring reporting channel state information in a high efficiency, high performance communications system |
US6771706B2 (en) | 2001-03-23 | 2004-08-03 | Qualcomm Incorporated | Method and apparatus for utilizing channel state information in a wireless communication system |
KR100510434B1 (ko) * | 2001-04-09 | 2005-08-26 | 니폰덴신뎅와 가부시키가이샤 | Ofdm신호전달 시스템, ofdm신호 송신장치 및ofdm신호 수신장치 |
KR100547848B1 (ko) * | 2002-01-16 | 2006-02-01 | 삼성전자주식회사 | 다중 반송파 이동통신시스템에서 순방향 채널 상태 정보송수신 방법 및 장치 |
US20040203476A1 (en) * | 2002-10-08 | 2004-10-14 | Jung-Tao Liu | Method of feedback for HSDPA system using OFMDA |
US6927728B2 (en) * | 2003-03-13 | 2005-08-09 | Motorola, Inc. | Method and apparatus for multi-antenna transmission |
CN1249942C (zh) * | 2003-05-13 | 2006-04-05 | 武汉汉网高技术有限公司 | 正交频分复用系统中的随机接入方法 |
KR100539925B1 (ko) * | 2003-08-22 | 2005-12-28 | 삼성전자주식회사 | 직교주파수분할다중 시스템에서 부반송파 할당 장치 및 방법 |
KR100566274B1 (ko) * | 2003-11-20 | 2006-03-30 | 삼성전자주식회사 | 직교주파수분할다중 시스템에서 부반송파 할당 장치 및방법 |
US7872963B2 (en) | 2003-12-27 | 2011-01-18 | Electronics And Telecommunications Research Institute | MIMO-OFDM system using eigenbeamforming method |
CN1585392B (zh) * | 2004-06-07 | 2010-04-21 | 东南大学 | 正交频分多址系统中的自适应传输方案 |
-
2005
- 2005-08-02 EP EP05768368A patent/EP1912362B1/en not_active Expired - Fee Related
- 2005-08-02 CN CN2005800510959A patent/CN101223718B/zh not_active Expired - Fee Related
- 2005-08-02 WO PCT/JP2005/014098 patent/WO2007015292A1/ja active Application Filing
- 2005-08-02 JP JP2007529148A patent/JP4460605B2/ja not_active Expired - Fee Related
- 2005-08-02 US US11/921,933 patent/US7983351B2/en not_active Expired - Fee Related
- 2005-08-02 DE DE602005027618T patent/DE602005027618D1/de active Active
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2003087070A (ja) | 2001-09-06 | 2003-03-20 | Ntt Docomo Inc | 送信機および受信機 |
JP2003169036A (ja) * | 2001-11-30 | 2003-06-13 | Japan Telecom Co Ltd | 直交周波数分割多重システムおよび送受信装置 |
JP2004104293A (ja) * | 2002-09-06 | 2004-04-02 | Mitsubishi Electric Corp | 再送制御方法および通信装置 |
Non-Patent Citations (4)
Title |
---|
BABA T., SANPEI S., MORINAGA N.: "OFDM Tekio Hencho System ni Oite Carrier Hole Seigyo o Mochiita Block Seigyogata Multi-level Soshin Denryoku Seigyo Hoshiki ni Kansuru Kento", IEICE TECHNICAL REPORT, vol. 103, no. 553, 9 January 2004 (2004-01-09), pages 11 - 16, XP003005997 * |
NTT DOCOMO: "Physical Channels and Multiplexing in Evolved UTRA Downlink,3GPP Draft, Rl-050590_Physical Channels and Multiplexing in DL", vol. RAN WG1, 16 June 2005 (2005-06-16) |
See also references of EP1912362A4 |
TOMOTO J. ET AL.: "Tekio Hencho o Mochiita Burst Mode OFDM Tsushin Hoshiki ni Kansuru Kento", IEICE TECHNICAL REPORT, vol. 101, no. 280, 31 August 2001 (2001-08-31), pages 51 - 57, XP003005998 * |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2008041632A1 (fr) * | 2006-10-04 | 2008-04-10 | Sharp Kabushiki Kaisha | Dispositif de génération d'informations de rapport, dispositif de communication, procédé de génération d'informations de communication, et programme de génération d'informations de communication |
WO2009088336A1 (en) * | 2008-01-11 | 2009-07-16 | Telefonaktiebolaget L M Ericsson (Publ) | Feedback with unequal error protection |
US9112647B2 (en) | 2008-01-11 | 2015-08-18 | Idtp Holdings, Inc. | Feedback with unequal error protection |
US9729272B2 (en) | 2008-01-11 | 2017-08-08 | Idtp Holdings, Inc. | Feedback with unequal error protection |
US20100054356A1 (en) * | 2008-09-01 | 2010-03-04 | Keerthi Arvind V | Interference avoiding mimo |
US8526525B2 (en) * | 2008-09-01 | 2013-09-03 | Arvind V. Keerthi | Interference avoiding MIMO |
JP2014515907A (ja) * | 2011-04-21 | 2014-07-03 | ゼットティーイー コーポレイション | 多重入出力(mimo)のための空間チャネル状態情報のフィードバック方法およびシステム |
JP2014195144A (ja) * | 2013-03-28 | 2014-10-09 | Softbank Mobile Corp | マルチユーザmimoシステムにおけるフィードバック情報の制御方法、及びマルチユーザmimoシステムの移動局及び基地局 |
Also Published As
Publication number | Publication date |
---|---|
JPWO2007015292A1 (ja) | 2009-02-12 |
DE602005027618D1 (de) | 2011-06-01 |
EP1912362A1 (en) | 2008-04-16 |
EP1912362B1 (en) | 2011-04-20 |
US7983351B2 (en) | 2011-07-19 |
CN101223718A (zh) | 2008-07-16 |
US20090092198A1 (en) | 2009-04-09 |
JP4460605B2 (ja) | 2010-05-12 |
EP1912362A4 (en) | 2009-11-18 |
CN101223718B (zh) | 2011-09-28 |
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