WO2009110240A1 - 無線受信装置及びフィードバック方法 - Google Patents
無線受信装置及びフィードバック方法 Download PDFInfo
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- WO2009110240A1 WO2009110240A1 PCT/JP2009/000995 JP2009000995W WO2009110240A1 WO 2009110240 A1 WO2009110240 A1 WO 2009110240A1 JP 2009000995 W JP2009000995 W JP 2009000995W WO 2009110240 A1 WO2009110240 A1 WO 2009110240A1
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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
- H04L1/0028—Formatting
- H04L1/003—Adaptive formatting arrangements particular to signalling, e.g. variable amount of bits
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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
- 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
- H04L1/0028—Formatting
- H04L1/0029—Reduction of the amount of signalling, e.g. retention of useful signalling or differential signalling
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- H—ELECTRICITY
- 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
- H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
- H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
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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
- H04L25/0204—Channel estimation of multiple channels
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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
- H04L25/024—Channel estimation channel estimation algorithms
- H04L25/0242—Channel estimation channel estimation algorithms using matrix methods
- H04L25/0248—Eigen-space methods
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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
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/21—Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
- H04W72/542—Allocation or scheduling criteria for wireless resources based on quality criteria using measured or perceived quality
Definitions
- the present invention relates to a radio reception apparatus and a feedback method.
- MIMO Multiple-Input Multiple-Output
- both the transmission device and the reception device each include a plurality of antennas. Specifically, since a plurality of data can be transmitted using the same frequency at the same time, a high transmission rate can be realized.
- eigenmode transmission As this MIMO transmission system, a transmission system called eigenmode transmission is known.
- eigenmode transmission propagation path information between transmitting and receiving apparatuses is obtained by channel estimation, and an eigenvalue decomposition is performed on a correlation matrix H H H of the obtained propagation path information (propagation channel matrix H) to obtain an eigenvalue ⁇ and an eigenvector W. This is shown in equation (1). Then, send the WH H weights, by using the W H as reception weight allows parallel transmission of the eigenvalues of minutes.
- ⁇ k is the k-th eigenvalue and has a relationship of ⁇ 1 > ⁇ 2 > ⁇ 3 > ⁇ 4 .
- a transmission weight w k is assigned to the k-th stream s k and is transmitted using the channel of the k-th eigenvalue ⁇ k . Therefore, higher quality transmission can be realized as the eigenvalue number (stream number) k is smaller.
- Each terminal feeds back a CQI (Channel Quality Indicator) determined based on SINR (Signal-to-Interference-and Noise-Ratio) for each RB (Resource Block) to the base station, and the base station uses these CQIs to each terminal. Allocate communication resources.
- CQI Channel Quality Indicator
- SINR Signal-to-Interference-and Noise-Ratio
- the base station preferentially allocates communication resources to terminals that have fed back higher CQI. For this reason, as the number of terminals increases, the number of terminals that feed back a high CQI increases, so that cell throughput (peak data rate, frequency utilization efficiency) is improved.
- CQI feedback methods include a Best-M report and a DCT (Discrete Cosine Transform) report.
- FIG. 2 shows an overview of the Best-M report.
- the average CQI of the entire transmission band (N RB ) (expressed in X bits)
- the top M RBs with the highest CQI level are selected, and the CQI corresponding to the selected RB (the CQI of each RB is Y (Represented in bits) and the position of the selected RB (represented in log 2 ( NRB C M ) bits).
- the quantization bit number Y of the top M CQIs is expressed as a difference value from the average CQI.
- Figure 3 shows the CQI feedback format based on the Best-M report.
- X 5 bits
- Y 3 bits
- the base station demodulates the feedback information based on the Best-M report and reproduces the SINR for each RB.
- Figure 4 shows an overview of the DCT report.
- a direct current (DC) component (expressed in X bits) and M frequency components having low frequency components (expressed in Y bits per frequency) are fed back from the result of DCT conversion of SINR for each RB.
- the total X + MY bits are fed back.
- M frequency components are fed back in order from the lowest frequency, it is not necessary to feed back position information unlike the Best-M report.
- Fig. 5 shows the CQI feedback format based on the DCT report.
- X 5 bits
- Y 5 bits
- the base station converts the feedback information based on the DCT report into IDCT (Inverse Discrete Cosine Transform) and reproduces the SINR for each RB.
- IDCT Inverse Discrete Cosine Transform
- SINR k of the k-th stream is used as an index of quality
- DCT report In this case, SINR is DCT converted for each stream.
- the eigenmode transmission described above when feeding back the CQI, using the eigenvalues lambda k instead of SINR k as an index of quality, the eigenvalues lambda k and CQI conversion in the case of Best-M reporting, DCT reported In this case, the eigenvalue ⁇ k is DCT transformed.
- the same CQI feedback format as that in the SIMO (Single-Input Multiple-Output) channel is applied to each stream, so that the number of CQI feedback increases in proportion to the number of streams in the MIMO channel as shown in FIG. Resulting in.
- An object of the present invention is to provide a radio reception apparatus and a feedback method that reduce the amount of CQI feedback in a MIMO channel.
- a radio receiving apparatus includes a receiving unit that receives signals transmitted from a plurality of antennas via a plurality of antennas, and a channel matrix between the transmitting antenna and the receiving antenna using a pilot signal among the received signals.
- Channel estimation means for deriving eigenvalues by eigenvalue decomposition of the estimated channel matrix, converting the eigenvalues into CQIs for each eigenvalue number, the number of average CQI quantization bits in each stream, the number of upper CQIs to be fed back,
- a configuration comprising: feedback information generating means for generating CQI feedback information by reducing any of the number of upper CQI quantization bits by a number corresponding to the eigenvalue number; and transmitting means for transmitting the feedback information. take.
- a radio receiving apparatus includes a receiving unit that receives signals transmitted from a plurality of antennas via a plurality of antennas, and a channel matrix between the transmitting antenna and the receiving antenna using a pilot signal among the received signals.
- Channel estimation means for eigenvalue decomposition of the estimated channel matrix and eigenvalue decomposition, DCT transform of the eigenvalue for each eigenvalue number, and the number of quantization bits of the DC component in each stream, the number of frequency components other than the DC component ,
- a feedback information generating means for generating any CQI feedback information by reducing any of the number of quantization bits of frequency components other than the DC component by a number corresponding to the eigenvalue number, and a transmitting means for transmitting the feedback information;
- the structure which comprises is taken.
- the feedback method of the present invention includes a channel estimation step of estimating a channel matrix between a plurality of transmitting antennas and a plurality of receiving antennas, eigenvalue decomposition of the estimated channel matrix to obtain an eigenvalue, and converting the eigenvalue into a CQI for each eigenvalue number.
- Feedback information for converting and generating CQI feedback information by reducing any one of the number of quantization bits of average CQI in each stream, the number of higher CQIs to be fed back, and the number of quantization bits of CQI by the number corresponding to the eigenvalue number A generating step and a transmitting step for transmitting the feedback information.
- the figure which shows a mode that the eigenvalue of a 1st-4th stream is DCT-transformed
- FIG. 7 is a block diagram showing the configuration of the receiving apparatus according to Embodiment 1 of the present invention. Here, description will be made assuming that there are four antennas.
- Radio receiving sections 102-1 to 102-4 down-convert signals received via corresponding antennas 101-1 to 101-4 into baseband signals, and output data signals of the received signals to MIMO demodulation section 106. Then, the pilot signal among the received signals is output to channel estimation section 103.
- Channel estimation section 103 estimates the channel matrix for each RB between the transmitting and receiving antennas using the pilot signals output from radio receiving sections 102-1 to 102-4, decomposes the estimated channel matrix into eigenvalues, and performs eigenvalue decomposition. And the eigenvector.
- the obtained eigenvalue and eigenvector are output to the feedback information generation section 104 as transmission weights, and the value obtained by multiplying the eigenvector by the channel matrix is output to the MIMO demodulation section 106 as reception weights.
- the channel matrix is a matrix of channel gain between the transmission antenna and the reception antenna.
- the feedback information generation unit 104 includes a feedback bit table that associates the average number of CQI quantization bits to be transmitted for each eigenvalue and the number of CQI quantization bits in each RB.
- the feedback information generation unit 104 averages the eigenvalues output from the channel estimation unit 103 for each RB, and converts the averaged eigenvalues into CQIs for each eigenvalue number (stream).
- Feedback information generation section 104 generates feedback information from the CQI for each eigenvalue with the number of quantization bits according to the feedback bit table, and outputs the feedback information to radio transmission section 105. Details of the feedback information generation unit 104 will be described later.
- Radio transmitting section 105 up-converts the feedback information output from feedback information generating section 104 and transmits it from antennas 101-1 to 101-4.
- the MIMO demodulator 106 multiplies the data signal output from the radio receivers 102-1 to 102-4 by the reception weight output from the channel estimator 103, and separates the streams.
- the separated streams are output to data demodulation sections 107-1 to 107-4, respectively.
- Data demodulating sections 107-1 to 107-4 convert the stream output from MIMO demodulating section 106 from modulation symbols to soft decision bits and output the data to decoding sections 108-1 to 108-4.
- Data decoding sections 108-1 to 108-4 perform channel decoding on the soft decision bits output from data demodulation sections 107-1 to 107-4 to restore transmission data.
- the feedback information generation unit 104 includes a feedback bit table that decreases the number of average CQI quantization bits X k as the eigenvalue number k increases.
- it is five bits average CQI of the eigenvalues lambda 1, average 4 bits of CQI of eigenvalue lambda 2, 3-bit average CQI of eigenvalue lambda 3, and 2 bits average CQI of eigenvalue lambda 4.
- the larger the eigenvalue number k the smaller the average eigenvalue (average eigenvalue in the figure), that is, the smaller the average CQI value.
- the number of CQIs M k to be fed back is 5 and the number of quantization bits Y k of the upper M k CQIs is 3 bits.
- feedback information generation section 104 converts the eigenvalue averaged for each RB into CQI for each eigenvalue number (stream), and feeds back from the CQI for each eigenvalue with the number of bits according to the feedback bit table. Generate information.
- FIG. 11 is a block diagram showing a configuration of the transmission apparatus according to Embodiment 1 of the present invention. Here, description will be made assuming that there are four antennas.
- Radio receiving section 202 receives feedback information fed back from the receiving apparatus via antennas 201-1 to 201-4, down-converts the received feedback information into a baseband signal, and outputs it to feedback information demodulation section 203. .
- the feedback information demodulating unit 203 includes the same feedback bit table as the feedback bit table included in the feedback information generating unit 104 of the receiving apparatus illustrated in FIG. 7, and the feedback information output from the wireless receiving unit 202 is based on the feedback bit table. Demodulate to obtain transmission weight and CQI (channel coding rate and modulation level). The acquired transmission weight is output to MIMO multiplexing section 206, the channel coding rate is output to encoding sections 204-1 to 204-4, and the modulation level is output to modulation sections 205-1 to 205-4. Details of feedback information demodulating section 203 will be described later.
- Encoding sections 204-1 to 204-4 encode each input transmission data with the channel coding rate output from feedback information demodulation section 203, and encode the encoded data into modulation sections 205-1 to 205-4. Output. Modulation sections 205-1 to 205-4 modulate the encoded data output from encoding sections 204-1 to 204-4 with the modulation level output from feedback information demodulation section 203, and modulate the modulation symbols to MIMO multiplexing sections. It outputs to 206.
- the MIMO multiplexing unit 206 multiplies the modulation symbol output from the modulation units 205-1 to 205-4 by the transmission weight output from the feedback information demodulation unit 203, and converts it into a transmission stream.
- MIMO multiplexing section 206 multiplexes all transmission streams and outputs them to radio transmission sections 207-1 to 207-4.
- Radio transmitting sections 207-1 to 207-4 up-convert the transmission stream output from MIMO multiplexing section 206, and transmit it from antennas 201-1 to 201-4.
- the feedback information demodulation unit 203 includes a feedback bit table shown in FIG.
- the feedback information demodulator 203 refers to the feedback bit table, refers to the average CQI quantization bit number X k of the k-th stream, and the CQI number M k to be fed back.
- the number of quantization bits Y k of the CQI is acquired.
- the CQI feedback amount when performing CQI feedback based on the Best-M report, can be reduced by decreasing the number of quantization bits of the average CQI as the eigenvalue number increases. it can.
- the feedback information generation unit 104 and the feedback information demodulation unit 203 according to Embodiment 2 of the present invention include a feedback bit table that reduces the number of CQIs M k to be fed back as the eigenvalue number k decreases.
- the average CQI quantization bit number is 5 bits, and the CQI quantization bit number to be fed back is 3 bits.
- the CQI feedback amount can be reduced by reducing the number of CQIs to be fed back as the eigenvalue number is smaller.
- the feedback information generation section 104 and the feedback information demodulation section 203 generate a feedback bit table that decreases the number of quantization bits Y k of CQI as the eigenvalue number k increases.
- I have.
- CQI quantization bits Y 1 and Y 2 to be fed back at eigenvalue ⁇ 1 and eigenvalue ⁇ 2 are fed back
- CQI quantization bits Y 3 and Y 4 to be fed back at eigenvalue ⁇ 3 and eigenvalue ⁇ 4 are fed back. 2 bits.
- the average CQI quantization bit number is 5 bits, and the CQI number to be fed back is 5.
- the CQI feedback amount can be reduced by decreasing the number of CQI quantization bits as the eigenvalue number increases. .
- Feedback information generation section 104 averages the eigenvalues output from channel estimation section 103 for each RB, and the eigenvalue averaged for each RB as shown in FIGS. 14A to 14D. DCT conversion is performed for each (stream).
- the feedback information generation unit 104 includes a feedback bit table that associates the number of quantization bits X k of the DC component to be transmitted for each eigenvalue, the number of frequency components M k, and the number of quantization bits Y k of the frequency components. .
- Feedback information generation section 104 generates feedback information from the DC components of CQI and Mk frequency components DCT transformed for each eigenvalue according to the feedback bit table, and outputs the feedback information to radio transmission section 105.
- the feedback information generation unit 104 includes a feedback bit table that decreases the number of quantization bits X k of the DC component of CQI as the eigenvalue number k increases.
- 5-bit quantization bit number X 1 of the DC component of the CQI in the eigenvalues lambda 1 4-bit quantization bit number X 2 of the DC component of the CQI in eigenvalue lambda 2
- 3-bit quantization bit number X 3 are a number of quantization bits X 4 two-bit DC component of the CQI in the eigenvalue lambda 4.
- the frequency component number M k is 4, and the frequency component quantization bit number Y k. Is 5 bits.
- the feedback information generation unit 104 quantizes the DCT-transformed CQI frequency component based on the frequency component number M k and the frequency component quantization bit number Y k of the feedback bit table shown in FIG. Feedback information is generated together with the components.
- the feedback information demodulation unit 203 in FIG. 11 includes the same feedback bit table as the feedback bit table shown in FIG. 15, and performs IDCT conversion on the feedback information output from the wireless reception unit 202 based on the feedback bit table, and performs RB Find the eigenvalue for each.
- Feedback information demodulation section 203 determines the channel coding rate and modulation level from the obtained eigenvalues, outputs the channel coding rate to coding sections 204-1 to 204-4, and modulates the modulation level to modulation sections 205-1 to 205-1 Output to 205-4.
- the amount of CQI feedback can be reduced by decreasing the number of quantization bits of the DC component of CQI as the eigenvalue number increases. it can.
- the feedback information generating section 104 and the feedback information demodulating section 203 reduce the number of frequency components Mk of the CQI subjected to DCT conversion as the eigenvalue number k is smaller.
- the frequency component number M 1 of the eigenvalues lambda 1 0, the frequency component number M 2 of the eigenvalues lambda 2 2, the frequency component number M 3 of 3 in eigenvalue lambda 3, the frequency component number M 4 in the eigenvalue lambda 4 4 It is said.
- the DC component quantization bit number is 5 bits
- the frequency component quantization bit number is 5 bits.
- the CQI feedback amount can be reduced by reducing the number of frequency components of CQI subjected to DCT conversion as the eigenvalue number is smaller.
- the feedback information generating section 104 and the feedback information demodulating section 203 reduce the frequency component quantization bit number Y k as the eigenvalue number k increases. It has.
- the eigenvalues lambda 5 bit quantization bit number Y 1 of the frequency components in the 1 eigenvalue lambda 4 bits quantization bits Y 2 of frequency components in the 2, eigenvalues lambda quantization bit rate frequency component of 3 Y 3 3 bits, and the eigenvalues ⁇ of the frequency components in the 4 quantization bits Y 4 and 2 bits.
- the number of quantization bits of the DC component is 5 bits, and the number of frequency components to be fed back is 4.
- the CQI feedback amount can be reduced by decreasing the number of quantization bits of the frequency component as the eigenvalue number increases.
- the feedback information generating section 104 and the feedback information demodulating section 203 according to Embodiment 7 of the present invention have a frequency component quantization bit number Y k as the frequency component number n of CQI subjected to DCT conversion increases.
- 5-bit quantization bit number Y 1 of the first frequency component in the eigenvalue lambda 1, 4-bit quantization bit number Y 2 of the second frequency component, the number of quantization bits Y 3 of the third frequency component 3 bits, and the number of quantization bits Y 4 of the fourth frequency component and 2 bits.
- first and 4-bit quantization bit number Y 2 of the second frequency component third and 3 bits quantization bits Y 2 of the fourth frequency component in the eigenvalue lambda 2.
- first and third bit quantization bit number Y 3 of the second frequency component third and 2-bit quantization bit number Y 3 of the fourth frequency component in the eigenvalue lambda 3.
- the number of quantization bits of the DC component is 5 bits, and the number of frequency components to be fed back is 4.
- the reason why the frequency component quantization bit number Yk is decreased as the frequency component number n of the DCT-converted CQI is larger is because the influence on the CQI feedback accuracy is smaller as the frequency component number n is larger.
- the reason why the interval for decreasing the number of quantization bits Y k of other frequency components is increased with respect to the first frequency component (indicated as the first component in the figure) as the eigenvalue number k is smaller is that the eigenvalue number k is This is because the smaller the frequency, the slower the frequency selectivity of the eigenvalue, and the power is biased toward the low frequency component of the DCT.
- the CQI feedback amount can be further reduced by increasing the interval for reducing the number of quantization bits of other frequency components with respect to the first frequency component.
- the feedback information generation section 104 and the feedback information demodulation section 203 increase the average CQI quantization bit number Xk and CQI quantization bits as the eigenvalue number k increases.
- a feedback bit table for reducing the number Yk is provided.
- the eigenvalues average 5-bit CQI's lambda 1, the eigenvalues lambda average 4 bits of CQI 2, the eigenvalues lambda 1 and eigenvalue lambda quantization bit of CQI to be fed back in 2 Y 1, Y 2 and 3 bits.
- the amount of feedback can be further reduced.
- the feedback information generation section 104 and the feedback information demodulation section 203 increase the number of quantization bits X k of the DC component of CQI and the frequency component as the eigenvalue number k increases.
- number of quantization bits Y k, the first frequency component to reduce the number of quantization bits Y k (the first component and the display in the drawing), and the quantization of the higher frequency component frequency component number n of CQI that DCT transform is large A feedback bit table for reducing the number of bits Yk is provided.
- 5 bits the number of quantization bits of the DC component in the eigenvalue lambda 1, 5-bit quantization bit number Y 1 of the first frequency component, 4 bits quantization bit number Y 1 of the second frequency component, third
- the frequency component quantization bit number Y 1 is 3 bits
- the fourth frequency component quantization bit number Y 1 is 2 bits.
- 4 bits the number of quantization bits of the DC component in the eigenvalue lambda 2, 4-bit quantization bit number Y 2 of the first and second frequency component, the number of quantization bits Y 2 of the third and fourth frequency components It is 3 bits.
- 3-bit quantization bit number of the DC component in the eigenvalue lambda 3 3-bit quantization bit number Y 3 of the first and second frequency component, the number of quantization bits Y 3 of the third and fourth frequency components 2 bits.
- the quantization bit number of the DC component in the eigenvalue ⁇ 4 is 2 bits
- the quantization bit number Y 4 of the first to fourth frequency components is all 2 bits. The number of frequency components to be fed back is 4.
- the frequency component number of the CQI is larger, the number of quantization bits of the frequency component is decreased, and as the eigenvalue number is smaller, the interval of decreasing the number of quantization bits of the other frequency components is decreased with respect to the first frequency component.
- each functional block used in the description of each of the above embodiments is typically realized as an LSI which is an integrated circuit. These may be individually made into one chip, or may be made into one chip so as to include a part or all of them.
- the name used here is LSI, but it may also be called IC, system LSI, super LSI, or ultra LSI depending on the degree of integration.
- the method of circuit integration is not limited to LSI, and may be realized by a dedicated circuit or a general-purpose processor.
- An FPGA Field Programmable Gate Array
- a reconfigurable processor that can reconfigure the connection and setting of circuit cells inside the LSI may be used.
- the radio reception apparatus and feedback method according to the present invention can reduce the amount of CQI feedback in a MIMO channel, and can be applied to, for example, a mobile communication system.
Abstract
Description
3GPP, R1-062954, LG Electronics, "Analysis on DCT based CQI reporting Scheme", RAN1#46-bis, Seoul, October 9-13, 2006
図7は、本発明の実施の形態1に係る受信装置の構成を示すブロック図である。ここでは、アンテナを4本として説明する。無線受信部102-1~102-4は、対応するアンテナ101-1~101-4を介して受信した信号をベースバンド信号にダウンコンバートし、受信信号のうちデータ信号をMIMO復調部106に出力し、受信信号のうちパイロット信号をチャネル推定部103に出力する。
本発明の実施の形態2に係る受信装置及び送信装置の構成は、一部の機能が異なるのみで実施の形態1の図7及び図11に示した構成と同様であるので、図7及び図11を援用し、重複する説明は省略する。
本発明の実施の形態3に係る受信装置及び送信装置の構成は、一部の機能が異なるのみで実施の形態1の図7及び図11に示した構成と同様であるので、図7及び図11を援用し、重複する説明は省略する。
本発明の実施の形態4に係る受信装置及び送信装置の構成は、一部の機能が異なるのみで実施の形態1の図7及び図11に示した構成と同様であるので、図7及び図11を援用し、重複する説明は省略する。
を5ビットとする。
本発明の実施の形態5に係る受信装置及び送信装置の構成は、一部の機能が異なるのみで実施の形態1の図7及び図11に示した構成と同様であるので、図7及び図11を援用し、重複する説明は省略する。
本発明の実施の形態6に係る受信装置及び送信装置の構成は、一部の機能が異なるのみで実施の形態1の図7及び図11に示した構成と同様であるので、図7及び図11を援用し、重複する説明は省略する。
本発明の実施の形態7に係る受信装置及び送信装置の構成は、一部の機能が異なるのみで実施の形態1の図7及び図11に示した構成と同様であるので、図7及び図11を援用し、重複する説明は省略する。
本発明の実施の形態8に係る受信装置及び送信装置の構成は、一部の機能が異なるのみで実施の形態1の図7及び図11に示した構成と同様であるので、図7及び図11を援用し、重複する説明は省略する。
本発明の実施の形態9に係る受信装置及び送信装置の構成は、一部の機能が異なるのみで実施の形態1の図7及び図11に示した構成と同様であるので、図7及び図11を援用し、重複する説明は省略する。
Claims (11)
- 複数のアンテナから送信された信号を複数のアンテナを介して受信する受信手段と、
受信した前記信号のうち、パイロット信号を用いて送信アンテナ及び受信アンテナ間のチャネル行列を推定し、推定したチャネル行列を固有値分解して固有値を求めるチャネル推定手段と、
前記固有値を固有値番号毎にCQIに変換し、各ストリームにおける平均CQIの量子化ビット数、フィードバックする上位CQI数、上位CQIの量子化ビット数のいずれかを固有値番号に応じた数で削減して、CQIのフィードバック情報を生成するフィードバック情報生成手段と、
前記フィードバック情報を送信する送信手段と、
を具備する無線受信装置。 - 前記フィードバック情報生成手段は、固有値番号が大きいほど、平均CQIの量子化ビット数をより多く削減して、CQIのフィードバック情報を生成する請求項1に記載の無線受信装置。
- 前記フィードバック情報生成手段は、固有値番号が小さいほど、フィードバックする上位CQI数をより多く削減して、CQIのフィードバック情報を生成する請求項1に記載の無線受信装置。
- 前記フィードバック情報生成手段は、固有値番号が大きいほど、上位CQIの量子化ビット数をより多く削減して、CQIのフィードバック情報を生成する請求項1に記載の無線受信装置。
- 複数のアンテナから送信された信号を複数のアンテナを介して受信する受信手段と、
受信した前記信号のうち、パイロット信号を用いて送信アンテナ及び受信アンテナ間のチャネル行列を推定し、推定したチャネル行列を固有値分解して固有値を求めるチャネル推定手段と、
前記固有値を固有値番号毎にDCT変換し、各ストリームにおけるDC成分の量子化ビット数、DC成分以外の周波数成分数、DC成分以外の周波数成分の量子化ビット数のいずれかを固有値番号に応じた数で削減して、CQIのフィードバック情報を生成するフィードバック情報生成手段と、
前記フィードバック情報を送信する送信手段と、
を具備する無線受信装置。 - 前記フィードバック情報生成手段は、固有値番号が大きいほど、DC成分の量子化ビット数をより多く削減して、CQIのフィードバック情報を生成する請求項5に記載の無線受信装置。
- 前記フィードバック情報生成手段は、固有値番号が小さいほど、DC成分以外の周波数成分数をより多く削減して、CQIのフィードバック情報を生成する請求項5に記載の無線受信装置。
- 前記フィードバック情報生成手段は、固有値番号が大きいほど、DC成分以外の周波数成分の量子化ビット数をより多く削減して、CQIのフィードバック情報を生成する請求項5に記載の無線受信装置。
- 前記フィードバック情報生成手段は、周波数成分が高いほど、周波数成分の量子化ビット数をより多く削減して、CQIのフィードバック情報を生成する請求項5に記載の無線受信装置。
- 前記フィードバック情報生成手段は、固有値番号が小さいほど、DC成分以外で最も低い周波数成分の量子化ビット数の減少幅を大きくして、CQIのフィードバック情報を生成する請求項9に記載の無線受信装置。
- 複数の送信アンテナ及び複数の受信アンテナ間のチャネル行列を推定し、推定したチャネル行列を固有値分解して固有値を求めるチャネル推定工程と、
前記固有値を固有値番号毎にCQIに変換し、各ストリームにおける平均CQIの量子化ビット数、フィードバックする上位CQI数、CQIの量子化ビット数のいずれかを固有値番号に応じた数で削減して、CQIのフィードバック情報を生成するフィードバック情報生成工程と、
前記フィードバック情報を送信する送信工程と、
を具備するフィードバック方法。
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