WO2011017988A1 - Procédé d'obtention de qualité de canal et extrémité réceptrice dans un système entrées multiples/sorties multiples - Google Patents

Procédé d'obtention de qualité de canal et extrémité réceptrice dans un système entrées multiples/sorties multiples Download PDF

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WO2011017988A1
WO2011017988A1 PCT/CN2010/074838 CN2010074838W WO2011017988A1 WO 2011017988 A1 WO2011017988 A1 WO 2011017988A1 CN 2010074838 W CN2010074838 W CN 2010074838W WO 2011017988 A1 WO2011017988 A1 WO 2011017988A1
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interference
channel quality
layer
receiving end
user
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PCT/CN2010/074838
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English (en)
Chinese (zh)
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李儒岳
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中兴通讯股份有限公司
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0417—Feedback systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0621—Feedback content
    • H04B7/063—Parameters other than those covered in groups H04B7/0623 - H04B7/0634, e.g. channel matrix rank or transmit mode selection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0621—Feedback content
    • H04B7/0632—Channel quality parameters, e.g. channel quality indicator [CQI]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0621—Feedback content
    • H04B7/0634—Antenna weights or vector/matrix coefficients
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0636—Feedback format
    • H04B7/0639—Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection

Definitions

  • the present invention relates to the field of wireless communications, and in particular to a method for calculating a channel quality indicator (CQI) in a multiple input multiple output (MIMO) system.
  • CQI channel quality indicator
  • MIMO multiple input multiple output
  • spatial multiplexing may be used to increase the transmission rate, that is, the transmitting end transmits different data at different antenna positions on the same time-frequency resource.
  • resources of all antennas can be allocated to the same user in the case of a single user.
  • the above transmission form is called single-user MIMO (SU-MIMO).
  • resources of different antenna spaces can be allocated to different users in the case of multiple users.
  • This transmission form is called multi-user MIMO (MU-MIMO).
  • the transmitting end needs to allocate resources and decide the method of transmitting according to the channel information (CSI) of each user.
  • CSI channel information
  • the receiving end channel information between each pair of transmitting and receiving antennas can be obtained through channel estimation, and then the information is fed back to the eNB.
  • the UE In the actual situation, since the feedback requires system resources, the UE generally quantizes the information for feedback.
  • the feedback method of the quantized information mainly includes a Channel Quality Indicator (CQI), a Precoding Matrix Index (PMI), and a rank indication ( Rank Indicator, RI ).
  • the transmitting end may also estimate channel information from other methods, for example, using channel reciprocity to estimate downlink channel information from uplink channel information.
  • the receiver can calculate the Signal to Interference and Noise Ratio (SINR) through channel and interference estimation.
  • SINR Signal to Interference and Noise Ratio
  • the CQI is generally the quantized SINR.
  • the following is the minimum mean square error in the SU-MIMO Spatial Multiplexing scenario. MMSE) The calculation method of SINR at the receiver.
  • the channel between the transmitting end and the receiving end is a 2x2 matrix H, and when the rank is 2, the precoding is also a 2x2 matrix, after precoding processing.
  • the signal received at the receiving end is a 2x1 vector
  • w is also a 2x1 vector representing the interference and noise received by the 2 antennas
  • the sum is the data symbol in the different code substreams:
  • y f x s x + f 2 s 2 + n Equation (2)
  • SINR signal to interference and noise ratio
  • H is inter-cell interference
  • ⁇ is the transposed matrix of ⁇ ,.
  • N is a white noise of a Gaussian distribution
  • nn k is the interference and noise covariance matrix for the k stream, including the co-channel interference between the code substreams.
  • the precoding is predetermined from the standard codebook.
  • the interference between the code substreams can be accurately known in the SINR calculation, so that the CQI can be calculated more accurately.
  • the precoding is calculated by the receiving end, and the receiving end cannot accurately know the interference between the code substreams.
  • the calculation of CQI may be related to the actual transmission. deviation.
  • the SINR is calculated in a way that the SU-MIMO rank is 2, but each code substream is occupied by a different user, and the interference can be Said to be a multi-user interference.
  • the signal received at the receiver of User 1 is:
  • SINR Signal to Interference Ratio
  • the receiving end cannot accurately know the interference of multiple users in the future, it is also possible to roughly consider the interference caused by multiple users in the CQI calculation.
  • One of the methods is to calculate all SINRs for all precodings that may be paired with them, and then average them. For example, in Release 8, the codebook for two antennas is:
  • each user rank is 1, there are 4 code choices. If the transmitter allows non-orthogonal pairing, then each user has 3 codes to pair, which means there are 3 different interference possibilities. In this case, each possibility can be calculated and then averaged:
  • S is the number of coders, ie equal to 4;
  • ⁇ is the precoding of the interference. This can make a rough estimate of the interference, but this method can only be used in the case of codebooks. If there is no codebook, the precoding of the interference can have many possibilities, then there is no way to make a prediction. Summary of the invention
  • the technical problem to be solved by the present invention is to provide a channel quality acquisition method and a receiving end in a MIMO system for the receiver to perform channel quality calculation.
  • the present invention provides a channel quality acquisition method in a multiple input multiple output system, in which the receiving end acquires channel quality information, and the method includes: The past interference in a current time interval estimates the impact of the current interference on the channel quality, and the channel quality information is obtained.
  • the estimating comprises estimating by common pilot or demodulation pilot.
  • the step of the receiving end estimating the impact of the current interference on the channel quality according to the past interference includes: calculating an average value of the past interference and estimating the channel quality according to the average value, or by using the Multi-user interference within the time interval is filtered to estimate the channel quality.
  • the channel quality information comprises a signal to interference and noise ratio or a channel quality indicator.
  • the signal to interference and noise ratio S/NR ⁇ is: ⁇ k (k)f (k)*)-X,;
  • the channel quality indicator C3 ⁇ 4 ⁇ . is:
  • T is the time interval, and t is the current time
  • ⁇ ,. indicates inter-cell interference
  • H,.* indicates the transposed matrix of ⁇ ,.
  • I white noise of a Gaussian distribution
  • Uk represents interference generated by the user m after the pre-encoding process obtained according to the demodulation pilot
  • ⁇ ( ⁇ ) indicates that the X operation is performed.
  • ⁇ is 1, letchel, + ⁇ , f )f — ( ) — , .
  • the receiving end estimates the impact of the current interference on the channel quality according to the past interference
  • the step of acquiring the channel quality information includes: in the multi-user dual-flow beamforming mode, the receiving end is estimated according to the common pilot Channel matrix and obtaining an equivalent channel vector of the first layer according to the channel matrix, obtaining a single-user uninterrupted channel quality indicator CQ/ ⁇ according to the equivalent channel vector of the first layer; calculating according to the demodulation pilot An average of the multi-user interference, based on the average value and obtaining a difference from the multi-user channel quality indicator;
  • the channel quality information includes the difference and the difference.
  • said Q(f; R- strictly); f mt (k)f mt (k)*)- 'f ).
  • the method further comprises:
  • the receiving end feeds back the difference and the difference to the sending end.
  • the receiving end estimates the impact of the current interference on the channel quality according to the past interference
  • the step of acquiring the channel quality information includes: the receiving end obtains the equivalent of the first layer according to the demodulation pilot estimation a channel vector, according to the equivalent channel vector of the first layer, obtaining a channel quality indicator difference having multi-user interference and single-user interference-free according to the common pilot estimation
  • the channel quality information includes the eight ⁇ 4/4 and cg/ ⁇ .
  • the ⁇ 3 ⁇ 4/ ⁇ ( ⁇ 3 ⁇ 4 ⁇ - ⁇ ( ⁇ ⁇ + f mt (k)f mt (k)*) - .
  • the method further comprises: The receiving end feeds back the octave and c / ⁇ to the transmitting end.
  • the / m, m is equal to Hw,, m by the user after the pre-encoding process' equivalent channel vector precoding w, based on codebook selection.
  • the method further comprises:
  • the receiving end feeds back the channel quality information based on the codebook.
  • the receiving end estimates the impact of the current interference on the channel quality according to the past interference
  • the step of acquiring the channel quality information includes: a dual layer transmission for a single user multiple input multiple output system, at a common pilot port
  • the receiving end estimates a channel matrix according to the common pilot, and obtains an equivalent channel vector of the first layer and an equivalent channel vector of the second layer according to the channel matrix, and according to the solution
  • the average frequency of the inter-layer interference is calculated by the pilot frequency; the channel quality indicator of the first layer and the channel of the second layer are obtained according to the equivalent channel vector of the first layer, the equivalent channel vector of the second layer, and the average value Quality indicator.
  • the channel quality indicator CQI ⁇ of the first layer is:
  • T is the time interval, and t is the current time
  • R Dust amount ⁇ HH +N i;
  • Num int indicates the number of interfering cells;
  • ⁇ ,. indicates inter-cell interference
  • I white noise of a Gaussian distribution
  • f int (k) represents inter-layer interference obtained according to the demodulation pilot
  • ⁇ ( ⁇ ) indicates that the X operation is performed.
  • the method further comprises:
  • the receiving end After the receiving end acquires the channel quality information, the receiving end feeds back the ⁇ 3 ⁇ 4/ ⁇ and ⁇ 3 ⁇ 4/ ⁇ 2 to the transmitting end.
  • the receiving end estimates the impact of the current interference on the channel quality according to the past interference
  • the step of acquiring the channel quality information includes: a dual layer transmission for a single user multiple input multiple output system, at a common pilot port
  • the receiving end obtains an equivalent channel vector of the first layer and an equivalent channel vector of the second layer according to the demodulation pilot; and obtains the first channel according to the equivalent channel vector of the first layer.
  • a first layer channel quality indicator difference of one layer without inter-layer interference and inter-layer interference and obtaining a second layer without inter-layer interference and inter-layer interference according to the equivalent channel vector of the second layer Layer 2 channel quality indicator difference.
  • the first layer channel quality indicator difference ACQ/ is:
  • T is the time interval, and t is the current time; Representing an equivalent channel vector of the first layer obtained from the demodulation pilot estimation, and 2 representing an equivalent channel vector of the second layer obtained according to the demodulation pilot estimation;
  • Rrustoulin ⁇ H H +N i ; num int indicates the number of interfering cells;
  • ⁇ ,. indicates inter-cell interference
  • I white noise of a Gaussian distribution
  • f int (k) represents inter-layer interference obtained according to the demodulation pilot
  • ⁇ ( ⁇ ) indicates that the X operation is performed.
  • the method further comprises:
  • the receiving end feeds back the channel quality information to the transmitting end according to the channel quality indicator CQI TXD in the transmit diversity form of Release 8 port 5, the octet and the octet.
  • the step of the receiving end feeding back the channel quality information to the sending end comprises: the receiving end obtaining a channel quality indicator average value ⁇ 3 ⁇ 4/ according to the AC /, and ⁇ 3 ⁇ 4 / 2 , the CQ / ⁇ and the difference of ⁇ 3 ⁇ 4/ is fed back to the transmitting end; or
  • the receiving end feeds back the difference between the C / ⁇ and the difference, and the difference between the C / ⁇ and the ACQI 2 to the sending end;
  • the present invention also provides a receiving end in a multiple input multiple output system, which includes a channel quality acquiring module, and the module is configured to: estimate an impact of current interference on channel quality according to past interference within a current time interval, and obtain Channel quality information.
  • the channel quality information includes a signal to interference and noise ratio or a channel quality indicator.
  • SINR ⁇ i the signal to interference and noise ratio SINR ⁇ i is:
  • the channel quality indicator CQI is: Cu (curtain,);
  • T is the time interval, and t is the current time
  • ⁇ ,. indicates inter-cell interference
  • I white noise of a Gaussian distribution
  • f mt ⁇ (k) represents interference generated by the user m after the pre-encoding process obtained according to the demodulation pilot
  • ⁇ ( ⁇ ) indicates that the X operation is performed.
  • the channel quality obtaining method in the MIMO system proposed by the present invention can obtain more accurate channel quality information and feedback to the transmitting end when there are multiple layers of interference, without the codebook. Can also get a better estimate.
  • FIG. 1 is a schematic flow chart of a first mode in the first embodiment of the present invention
  • FIG. 2 is a schematic flow chart of a second mode in the first embodiment of the present invention.
  • FIG. 3 is a schematic flow chart of a fourth mode in the second embodiment of the present invention.
  • FIG. 4 is a schematic flow chart of a fifth mode in a second embodiment of the present invention.
  • Figure 5 is a flow chart showing the transmission of the channel quality information fed back by the receiving end according to the present invention.
  • the receiving end of the MIMO system of the present invention includes a channel quality acquiring module, which is configured to: estimate the impact of the current interference on the channel quality according to past interference within a current time interval, and obtain channel quality information.
  • the channel quality information includes CQI or SINR.
  • the receiving end estimates the influence of the current interference on the CQI or SINR according to the past interference, for example, averaging the interference in the past T time interval, according to the average The value is used to estimate the current channel quality information. After the channel quality information is obtained, the obtained channel quality information is fed back to the transmitting end, and the transmitting end performs transmission with the receiving end according to the channel quality information.
  • One of the methods is to estimate the current interference based on past interference.
  • the LTE standard includes a Demodulation Reference Signal (DMRS), which is a dedicated pilot transmitted by a transmitting end (eNB) to each receiving end (UE). This pilot needs to be precoded at the time of transmission. Processing, same as data precoding. Therefore, as long as the UE knows which layers its own channel is located, it can be known that other layers are interference, and interference estimation can be implemented from the DMRS of the interference layer.
  • DMRS Demodulation Reference Signal
  • the following is divided into MU-MIMO and SU-MIMO, respectively, to illustrate the calculation method for estimating CQI by DMRS.
  • the CQI and SINR of the user m ' are:
  • ⁇ ( ⁇ ) in the equation (6) represents a quantization operation on X.
  • * f in m ( H intm (t)
  • w intm (t) is the multi-user interference after the pre-coding process, which can be obtained according to the DMRS.
  • the interference in the period from the current time to the T time period is averaged.
  • a filter can be used to filter the multi-user interference before the current time period T.
  • T can also be equal to 1, that is, without averaging, only the current DMRS is used for interference estimation, and T is equal to 1 (5) ) expressed as: siU :' + DD)*)— ' Equation (5-1)
  • T 1 means that the averaging process is not performed, and the same applies to the SU-MIMO case.
  • interference is mainly co-channel interference generated by other users in the same cell. These interferences are pre-coded, so the size and change of interference depend on the eNB. For different eNBs, different pairing and precoding processes are used, resulting in different interference. By estimating the previous interference, the approximate strength of the interference generated by the eNB can be known, thereby making an estimate of the impact of the CQI.
  • H (t)w 2 (t) is the inter-layer interference after precoding processing, and can be obtained from the DMRS.
  • the interference from the current time to the time period before the T time period is averaged, or a filter can be used to filter the multi-layer interference before the current time T period.
  • the calculation method is the same as the first layer, namely:
  • the signal to interference and noise ratio SINR ⁇ 2 and the channel quality indicator CQI ⁇ 2 of the second layer in the double layer transmission are respectively: Formula (7-1)
  • Rrustoulin ⁇ H H +N i; num int indicates the number of interfering cells;
  • ⁇ ,. indicates inter-cell interference
  • N white noise of a Gaussian distribution
  • ⁇ ( ⁇ ) indicates that the X operation is performed
  • H (t) w, (t) is the inter-layer interference after precoding, which can be obtained from the DMRS.
  • ⁇ f mt (k)f mt (k)' represents the average of multiuser interference during the time interval.
  • T can also be equal to 1, that is, without averaging, only the current DMRS is used for interference estimation.
  • the following describes an example of how to calculate the channel shield by demodulating the pilot.
  • the transmission based on single antenna port 5 belongs to the application of a single stream beamforming (BF) technology.
  • BF single stream beamforming
  • a new transmission mode is proposed in the enhanced version of LTE Release 9, which belongs to a rank of 2
  • the non-codebook spatial multiplexing method that is, the transmission of the two antenna ports using the dual stream BF technology.
  • the eNB can determine the method of precoding processing itself. Although the eNB generally orthogonalizes the two layers of precoding vectors, due to various errors of the actual system, when the signals arrive at the UE, inter-layer interference is difficult to avoid.
  • the UE directly feeds back two CQIs, namely CQI ⁇ and CQI ⁇ .
  • FIG. 1 is a schematic flowchart of a first manner in which a receiving end feeds back channel quality information to a transmitting end in a SU-MIMO system when the number of common pilot signal ports (ports) is not less than the number of transmitting antennas.
  • the process mainly includes the following steps:
  • Step S110 the UE estimates a channel matrix H according to a common pilot CRS (Common Reference Signal);
  • CRS Common Reference Signal
  • Step S120 The UE obtains two feature vectors according to the channel matrix H.
  • Step S130 the UE obtains an equivalent channel vector/i and a first layer of the first layer according to the two feature vectors.
  • Step S140 The UE calculates an average value of inter-layer interference according to the DMRS.
  • Step S150 the UE acquires a first layer channel quality indicator and a layer 2 channel quality indicator according to the average value and the sum / 2 ;
  • Step S160 The UE feeds back the CQI ⁇ and the sender to the sender.
  • the first mode is based on the fact that the UE can learn the channels of all the antennas.
  • the number of CRS ports is not less than the number of transmit antennas. For example, the number of maximum CRSs in Release 8 is four. If there are eight antennas at the transmitting end, The first method described above does not apply.
  • the CQI (represented by CQI TXD ) is fed back by the transmit diversity form of the transmission of Release 8 port 5 (the CQI TXD is used here), and then the CQI is adjusted based on the average inter-layer interference.
  • the equivalent channel vector_ of the first layer and the equivalent channel vector / 2 of the second layer, where the equivalent channel vector and the second layer of the first layer estimated according to the DMRS are respectively used and represented respectively
  • the equivalent channel vector / 2 so the SINR of the first layer when there is interlayer interference is: curtain; ( ⁇ ⁇ + f mt (k)f mt (k) * rt (13)
  • the first layer of CQI difference in the first layer without inter-layer interference and inter-layer interference is:
  • CQI 2 Q(f Rj 2 -f (R nn ⁇ f mt (k)f mt (k)*) (15)
  • CQI E CQI TXD - ACQI (17)
  • the receiving end feeds back the CQI estimate ⁇ 3 ⁇ 4/ to the transmitting end, so that the estimated inter-layer interference can be reflected in the ⁇ 3 ⁇ 4/ s calculation process.
  • the transmitting end eNB After receiving the ⁇ 3 ⁇ 4/, the transmitting end eNB performs the adjustment of the CQI between different layers according to the two feature vectors of the eNB's own estimated channel.
  • 2 is a schematic flow chart of the second aspect of the present invention. As shown in Figure 2, the process mainly includes the following steps:
  • Step S210 The UE estimates a channel quality indicator in the form of transmit diversity of Release 8 port 5 according to the common pilot CRS;
  • Step S220 the UE estimates the equivalent channel vector of the first layer and the equivalent channel vector of the second layer according to the DMRS.
  • Step S230 the UE calculates, according to the first layer, the first layer CQI difference AC ⁇ of the first layer without inter-layer interference and inter-layer interference;
  • Step S240 the UE calculates, according to the second layer, the second layer CQI difference ⁇ ⁇ / 2 without inter-layer interference and inter-layer interference;
  • Step S260 The UE obtains a CQI estimate according to the CQ/ ⁇ and CQI average ACQ/
  • CQI E CQI TXD - ACQI is fed back to the sender.
  • the third mode obtains: according to the first layer CQI difference value and the second layer CQI difference value, and the CQI TXD :
  • the estimated value of a layer of CQI is:
  • CQI 2E CQI TXD - ACQI 2 (19)
  • the receiving end feeds the first layer CQI estimate ⁇ 3 ⁇ 4/ ⁇ and the second layer CQI estimate to the transmitting end.
  • Dual-stream BF can also support multi-user MIMO, with each user occupying only one stream (rank 1).
  • the first embodiment requires that the rank of the single-user channel is 2, and if the rank of the channel is 1, multi-user MIMO is required for spatial multiplexing. If the rank of the channel is 1 and no user is paired, then a single-user single-flow BF is required.
  • this embodiment uses a differential CQI feedback method.
  • the receiver will After the eNB, if the eNB finds that the two users are paired, it can calculate C ⁇ CQ/ ⁇ -ACQ/ ⁇ of the multi-user from ⁇ and ACQ/. If there is no user to pair, use CQI ⁇ to perform single-user transmission. .
  • the feedback CQI is taken as an example
  • the following four methods are included:
  • the CQI is fed back in a differential manner, and dynamic single-user and multi-user switching is supported.
  • the single-user interference-free CQI is:
  • ⁇ 3 ⁇ 4/ ⁇ is a positive number.
  • a bit less than CQI can be used for feedback.
  • C / ⁇ 1 is 5 Bit quantity It can be quantized with 3 bits.
  • FIG. 3 is a schematic flow chart of the fourth aspect of the present invention. As shown in Figure 3, the process mainly includes the following steps:
  • Step S310 the UE estimates the channel matrix H according to the common pilot CRS
  • Step S320 the UE obtains a strongest feature vector according to the channel matrix H;
  • Step S330 the UE obtains an equivalent channel vector f of the first layer according to the strongest feature vector, and in step S340, the UE calculates an average value of multi-user interference according to the DMRS, f ⁇ f mt (k)f mt (k)*;
  • Step S350 the UE acquires a single-user interference-free channel quality indicator according to the
  • Step S360 the UE obtains a difference CQI ⁇ of the single-user interference-free channel quality indicator CQI ⁇ and the multi-user CQI according to the average value and the;
  • Step S370 The UE feeds back the CQI ⁇ and the sender to the sender.
  • the equivalent channel vector of the first layer can be estimated according to the DMRS. This is used to indicate the amount estimated from the DMRS, so the difference from the single-user non-interference C0/ OT 1 is:
  • CQI SM Q(f; R- - f; (R nn ⁇ f mt (k)f mt ( k)*rt) (24)
  • the receiving end feeds back to the transmitting end the CQI TXD in the form of transmit diversity of the transmission with Release 8 port 5 and the CQl ⁇ .
  • FIG. 4 is a schematic flow chart of the fifth aspect of the present invention. As shown in Figure 4, the process mainly includes the following steps:
  • Step S410 the UE estimates a channel quality indicator in the form of transmit diversity of Release 8 port 5 according to the common pilot CRS;
  • Step S420 the UE estimates an equivalent channel vector of the first layer according to the DMRS.
  • Step S430 the UE calculates, according to the equivalent channel vector of the first layer, a CQI difference without multi-user interference and multi-user interference;
  • Step S440 the UE sends the CQI TXD and the feedback to the sending end.
  • FIG. 2 is a schematic diagram of a process in which the transmitting end performs transmission according to the channel quality information fed back by the receiving end when the highest channel rank is 2. As shown in FIG. 2, when the first embodiment and the second embodiment are mixed, the transmitting end performs transmission according to the channel quality fed back by the receiving end, and mainly includes the following steps:
  • Step S210 The receiving end UE calculates a rank of the channel.
  • Step S220 determining whether the rank of the channel is 1 or not, then proceeding to step S230, otherwise proceeding to step S250;
  • Step S230 the UE calculates a single-user interference-free channel quality indicator
  • Step S240 the UE calculates a difference ⁇ 3 ⁇ 4/ between the single-user uninterrupted channel quality indicator C0/ OT 1 and the multi-user channel quality indicator, and feeds the single-user uninterrupted channel quality indicator and the difference ACQ/ The transmitting end eNB, step S260;
  • Step S250 the UE calculates the channel quality of the dual layer, obtains the first layer channel quality indicator CQ/ ⁇ and the layer 2 channel quality indicator CQ/ ⁇ 2 , and sets the first layer channel quality indicator CQ/ ⁇ and the The layer 2 channel quality indicator ⁇ 3 ⁇ 4/ ⁇ 2 is fed back to the transmitting end, and the process goes to step S290;
  • Step S260 the sender tries to perform multi-user pairing, and determines whether the pairing is successful. If yes, the process goes to step S270, otherwise the process goes to step S280;
  • Step S270 the transmitting end uses multi-user dual-flow BF for information transmission;
  • Step S280 the sending end uses a single user single stream BF for information transmission
  • step S290 the transmitting end uses a single-user dual-stream BF for information transmission.
  • Mode 5 of LTE Release 8 supports codebook-based multi-user MIMO transmission.
  • the UE may also be based on the codebook when feeding back CQI and PMI, but in order to enhance the performance of MU-MIMO, the eNB transmits It is still possible to support non-codebook multi-user MIMO transmission.
  • H intm (t (0 is the interference generated from the user m after the precoding process
  • the average of the time is averaged by an estimate of the interference between now and T, or a filter can be used to filter the previous multiuser interference.
  • each module/unit in the foregoing embodiment may be implemented in the form of hardware, or may be implemented in the form of a software function module.
  • the invention is not limited to any specific form of combination of hardware and software.

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
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  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention porte sur un procédé d'obtention de qualité de canal et sur une extrémité réceptrice dans un système entrées multiples/sorties multiples. L'extrémité réceptrice calcule la qualité de canal afin d'obtenir des informations de qualité de canal selon le procédé. Dans le procédé, l'extrémité réceptrice estime l'influence sur la qualité de canal du brouillage présent selon le brouillage passé dans un intervalle de temps s'étendant jusqu'au moment actuel, et obtient ensuite les informations de qualité de canal. Au moyen du procédé présenté dans l'invention, l'extrémité réceptrice est capable d'obtenir des informations de qualité de canal relativement précises en cas de brouillage multicouche, et de les renvoyer à l'extrémité émettrice, pouvant obtenir ainsi un meilleur effet d'estimation au cas où le livre de code serait inexistant.
PCT/CN2010/074838 2009-08-12 2010-06-30 Procédé d'obtention de qualité de canal et extrémité réceptrice dans un système entrées multiples/sorties multiples WO2011017988A1 (fr)

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