WO2011160277A1 - 参考信号发送方法、信道质量估计方法、移动台、基站和无线通信系统 - Google Patents
参考信号发送方法、信道质量估计方法、移动台、基站和无线通信系统 Download PDFInfo
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- WO2011160277A1 WO2011160277A1 PCT/CN2010/074144 CN2010074144W WO2011160277A1 WO 2011160277 A1 WO2011160277 A1 WO 2011160277A1 CN 2010074144 W CN2010074144 W CN 2010074144W WO 2011160277 A1 WO2011160277 A1 WO 2011160277A1
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- mobile station
- reference signal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
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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
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
- H04L25/03343—Arrangements at the transmitter end
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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
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03891—Spatial equalizers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0014—Three-dimensional division
- H04L5/0023—Time-frequency-space
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
Definitions
- Mobile station base station and wireless communication system
- the present invention relates to wireless communication technologies, and more particularly to a reference signal transmission method, a channel quality estimation method, a mobile station, a base station, and a wireless communication system.
- the 4th generation (4G) mobile communication system for example, in the LTE (Long Term Evolution) Single-Carrier Frequency Division Multiple Access (SC-FDMA) uplink, using a reference signal (Reference Signal - RS) Data demodulation and channel sounding.
- LTE Long Term Evolution
- SC-FDMA Single-Carrier Frequency Division Multiple Access
- Reference Signal - RS Reference Signal
- the role of the uplink reference signal includes channel estimates required for coherent demodulation, channel quality probing for uplink scheduling, power control, timing estimation, and direction of arrival estimation to support downlink beamforming.
- the uplink reference signals in LTE are mostly based on the Zadoff-Chu (ZC) sequence.
- ZC sequence is also referred to as the GCL (Generalized Chirp-Like) sequence.
- the sequence is a non-binary unit amplitude sequence that satisfies the CAZAC (Constant Amplitude Zero Autocorrelation) feature.
- the CAZAC sequence is a complex-valued signal in the form of.
- a ZC sequence of length ⁇ ⁇ can be expressed as
- the ZC sequence has the following characteristics.
- the ZC sequence has a constant amplitude and is also constant amplitude after DFT operation.
- the constant amplitude characteristic limits the peak-to-average power ratio and the boundary and time flat-type interference generated by other users. In addition, this feature simplifies implementation when only phase calculation and storage are required without amplitude.
- the uplink reference signal has the following good characteristics: (1) The amplitude in the frequency domain is constant, in order to make the same for all allocated subcarriers in the unbiased channel estimation. (2) low-cubic metric (CM) values in the time domain are low; (3) very good autocorrelation properties to facilitate accurate channel estimation; (4) good cross-correlation properties, thereby reducing emissions from other cells Interference of reference signals transmitted on the same resource.
- CM low-cubic metric
- the uplink supports the following two reference signals:
- Demodulation reference signal (Demodulation RS, DMRS). Such reference signals are mainly used for channel estimation of uplink data transmission or signaling information transmission, and then related detection;
- SRS Sounding RS
- one subframe has a total of 14 symbols, numbered 0, 2, 1, ..., 13.
- the user's SRS signal can only be transmitted in the No. 13 symbol.
- the user's DMRS signal can only be transmitted in the No. 3 symbol and the No. 10 symbol.
- the uplink DMRS and SRS are time division multiplexed with data symbols.
- the DMRS of a given mobile station has the same bandwidth, such as the PUSCH bandwidth in the entire cell bandwidth. Therefore, when different bandwidths of the system are allocated to different users (FDMA), the DMRS of each user is also orthogonal to each other.
- the user's SRS bandwidth can be different from the bandwidth used for data transmission.
- the user's SRS signal is always transmitted on the last SC-FMDA symbol of a subframe, and the parameters of the SRS signal are signaled by the higher layer signaling of the system.
- the SRS signals of each mobile station are multiplexed by frequency division multiple access (FDM), code division multiple access (CDM), or time division multiple access (TDM).
- FDM frequency division multiple access
- CDM code division multiple access
- TDM time division multiple access
- the user's uplink signal transmission supports a single antenna transmission mode or an antenna selection transmission mode.
- the user's uplink signal transmission supports a single antenna transmission mode or an antenna selection transmission mode.
- only one set of SRS resources can be allocated per user.
- the mobile station in order to meet the higher uplink transmission rate index, the mobile station is required to support higher rank (Rank) transmission in the uplink, such as the transmission of rankl-rank4, thereby requiring the mobile station to be equipped with a higher number.
- Antennas such as mobile stations equipped with 2 antennas to support transmissions with a maximum rank of 2, or mobile stations equipped with 4 antennas to support transmissions with a maximum rank of 4.
- the first method is to not precode the DMRS so that the DMRS can also be used as an SRS, thereby reducing the occupation of SRS resources.
- a disadvantage of this approach is that there are two receivers for a Physical Uplink Shared Channel (PUSCH) with different DMRSs, one for the precoded DMRS and the other for the unprecoded DMRS. Furthermore, since each antenna occupies one cyclic shift resource in the case of channel quality estimation using uncoded DMRS, its use of cyclic shift (CS) resources is inefficient.
- PUSCH Physical Uplink Shared Channel
- the second method is to transmit both the precoded DMRS and the unprecoded DMRS in the DMRS subframe. Although this method does not require two receivers because the precoded DMRS always exists, there is still a cyclic shift due to each antenna occupying one cyclic shift resource in the case of channel quality estimation using uncoded DMRS. The problem of inefficient use of bit resources.
- At least one object of the present invention is to provide a reference signal transmitting method, a channel quality estimating method, a mobile station, a base station, and a wireless communication system capable of overcoming at least some of the disadvantages and deficiencies of the prior art described above, to provide a plurality of mobile stations In the case of an antenna, the occupation of SRS resources in each antenna signal estimation is effectively reduced.
- a reference signal transmitting method comprising: first precoding according to precoding for data to be transmitted through a plurality of antennas of a mobile station The matrix pre-codes the demodulation reference signal to be transmitted along with the data, and pre-codes the sounding reference signal to be transmitted along with the data according to the second pre-coding matrix.
- Different columns and different rows of the first precoding matrix and the second precoding matrix respectively correspond to different data and different antennas; and transmit the precoded sounding reference signal and the precoded demodulation reference signal, wherein
- the rank of the matrix formed by arranging all the column vectors in the first precoding matrix and all the column vectors in the second precoding matrix is greater than or equal to the number of the antennas.
- the first precoding matrix and the second precoding matrix may be previously set by the base station and notified to the mobile station.
- the mobile station may only pre-set and notify the mobile station of the first precoding matrix, and after receiving the first precoding matrix, the mobile station according to the first precoding matrix and the predefined first precoding matrix and the first A second precoding matrix is determined by a corresponding manner between the two precoding matrices.
- the first precoding matrix and the second precoding matrix may be mutually positive
- the first precoding matrix and the second precoding matrix may be changed by the base station from time to time and notified to the mobile station.
- a channel quality estimation method including: using a reference signal channel estimation value transmitted from a plurality of antenna accompanying data transmitted from a mobile station, And according to the received second precoding moment value that is transmitted along with the data, different columns and different rows of the first precoding matrix and the second precoding matrix respectively correspond to different data and different antennas;
- the first precoding matrix and the obtained demodulation reference signal channel estimate are derived from the first system of equations with the channel quality estimation values of the corresponding antennas, and are estimated based on the second precoding matrix and the obtained sounding reference signal channel estimates.
- a second system of equations in which a channel quality estimate of the corresponding antenna is a variable, wherein a rank of a matrix formed by arranging all column vectors in the first precoding matrix and all column vectors in the second precoding matrix is greater than or equal to The number of antennas; and the channel quality estimation of each antenna calculated by combining the first system of equations with the second system of equations value.
- the first precoding matrix and the second precoding matrix may be previously set by the base station and notified to the mobile station.
- the mobile station may only pre-set and notify the mobile station of the first precoding matrix, and after receiving the first precoding matrix, the mobile station according to the first precoding matrix and the predefined first precoding matrix and the first A second precoding matrix is determined by a corresponding manner between the two precoding matrices.
- the first precoding matrix and the second precoding matrix may be mutually positive Pay
- the first precoding matrix and the second precoding matrix may be changed by the base station from time to time and notified to the mobile station.
- a mobile station comprising: a plurality of antennas; a precoding unit configured to be used for transmitting through the plurality of antennas
- the first precoding matrix pre-coded by the data pre-codes the demodulation reference signal to be accompanied by the data transmission, and pre-codes the sounding reference signal to be transmitted along with the data according to the second pre-coding matrix, the first pre-coding Different columns and different rows of the matrix and the second precoding matrix respectively correspond to different data and different antennas, and are arranged by all column vectors in the first precoding matrix and all column vectors in the second precoding matrix.
- the rank of the constructed matrix is greater than or equal to the number of the antennas; and the transmitting unit is configured to transmit the precoded sounding reference signal and the precoded demodulation reference signal.
- the first precoding matrix and the second precoding matrix may be previously set by the base station and notified to the mobile station.
- the mobile station may only pre-set and notify the mobile station of the first precoding matrix, and after receiving the first precoding matrix, the mobile station according to the first precoding matrix and the predefined first precoding matrix and the first A second precoding matrix is determined by a corresponding manner between the two precoding matrices.
- the first precoding matrix and the second precoding matrix may be orthogonal to each other.
- the first precoding matrix and the second precoding matrix may be changed by the base station from time to time and notified to the mobile station.
- a base station comprising: a channel estimation unit configured to use the received data of a plurality of antennas accompanying data transmission from a mobile station a precoding matrix precoded demodulation reference signal for channel estimation to obtain a demodulation reference signal channel estimation value, and based on the received utilization channel channel estimation value that is transmitted along with the data, the first precoding matrix and the first The different columns and different rows of the two precoding matrices respectively correspond to different data and different antennas; the first arithmetic unit is configured to estimate the channel quality of the root as the first equation of the variable, and according to the second The precoding matrix obtains a sounding reference signal channel estimate that is derived from a second system of equations in which the channel shield estimate of the corresponding antenna is a variable, wherein all column vectors and second precoding matrices in the first precoding matrix are included The rank of the matrix formed by all the column vectors is greater than or equal to the number of
- the first precoding matrix and the second precoding matrix may be previously set by the base station and notified to the mobile station.
- the mobile station may only pre-set and notify the mobile station of the first precoding matrix, and after receiving the first precoding matrix, the mobile station according to the first precoding matrix and the predefined first precoding matrix and the first A second precoding matrix is determined by a corresponding manner between the two precoding matrices.
- the first precoding matrix and the second precoding matrix may be orthogonal to each other.
- the first precoding matrix and the second precoding matrix may be changed by the base station from time to time and notified to the mobile station.
- a wireless communication system comprising a mobile station as described above and a base station as described above.
- FIG. 1 is a flowchart of a reference signal transmitting method according to Embodiment 1 of the present invention
- FIG. 2 is a flowchart showing a reference signal transmitting method according to Embodiment 2 of the present invention
- FIG. 3 is a flowchart showing a channel quality estimation method according to Embodiment 3 of the present invention
- FIG. 4 is a flowchart showing a channel quality estimation method according to Embodiment 4 of the present invention
- 6 shows a schematic diagram of a base station according to Embodiment 6 of the present invention
- FIG. 7 shows a schematic diagram of a wireless communication system in accordance with a seventh embodiment of the present invention.
- the present invention mainly relates to a reference signal transmitting method in a wireless communication system, a mobile station using the same, a channel quality estimating method, and a base station using the same, and a wireless communication system including the above mobile station and base station. Therefore, the description of the process of the encoding process, the scheduling algorithm, and the ranging, synchronization, and codec in the wireless data transceiving process with the present invention is only focused on the pairing and moving.
- the reference signal transmission of the station is described in the process of estimating the antenna channel quality of the station.
- the uplink DMRS uses a precoding matrix [1, 1, 1, 1 and ⁇ encoding, at which point the system transmits one layer of data.
- the present invention provides a reference signal transmitting method applied to a mobile station.
- FIG. 1 is a flow chart showing a method of transmitting a reference signal according to a first embodiment of the present invention.
- the reference signal transmitting method according to the first embodiment of the present invention starts from step S101.
- step S101 precoding the demodulation reference signal (DMRS) to be accompanied by the data transmission according to a first precoding matrix for precoding the data to be transmitted through the plurality of antennas of the mobile station, And precoding the sounding reference signal (SRS) to be accompanied by the data according to the second precoding matrix, wherein different columns and different rows of the first precoding matrix and the second precoding matrix respectively correspond to different data And different antennas.
- DMRS demodulation reference signal
- SRS sounding reference signal
- step S101 not only the DMRS is precoded, but also the SRS is precoded.
- step S101 the rank of the matrix formed by arranging all the column vectors in the first precoding matrix and all the column vectors in the second precoding matrix is greater than or equal to the number of the antennas.
- step S102 the precoded sounding reference signal and the precoded demodulation reference signal are transmitted.
- the first system of equations can be obtained according to the channel quality estimates from all the column vectors in the first precoding matrix and the precoding based DMRS signals, the equations in the first system of equations The number of the same number is the same as the number of all column vectors in the first precoding matrix.
- the first and second equations are The total number of equations is greater than or equal to the number of variables requiring the solution (ie, channel quality estimates for each antenna). Therefore, based on these two equations, the estimated value of the signal of each antenna can be obtained.
- the rank of the matrices in which all the column vectors in the first precoding matrix and all the column vectors in the second precoding matrix are arranged are equal to the number of antennas, the channel quality estimation values of the respective antennas can be exactly obtained.
- the first and second equations may be used.
- the equations equal to the number of antennas are arbitrarily selected to obtain channel quality estimates for the respective antennas.
- first precoding matrix and the second precoding matrix and the like used in this embodiment can be flexibly selected and set according to the requirements of a specific application, which should all be in the present invention.
- the first precoding matrix and the second precoding matrix and the like used in this embodiment can be flexibly selected and set according to the requirements of a specific application, which should all be in the present invention.
- the reference signal transmitting method precodes the DMRS and the SRS according to the first precoding matrix and the second precoding matrix, respectively, and all the columns in the two precoding matrices
- the rank of the matrix formed by the vector arrangement is greater than or equal to the number of the antennas, so that the channel quality estimation of each antenna can be performed by using the DMRS and the SRS in combination with the corresponding base station side.
- the reference signal transmitting method effectively reduces the occupation of SRS resources in the antenna channel quality estimation by using the pre-coded DMRS and the pre-coded SRS in combination, and also avoids the use of precoding alone.
- the DMRS cannot perform the shortcomings of the signal estimation of each antenna.
- the reference signal transmitting method combines the base station side based on the precoded DMRS and the precoded SRS by transmitting the precoded DMRS and the precoded SRS.
- Signal estimation is performed, so that two receivers are also not required, and the occupation of cyclic shift resources is also reduced, thereby overcoming the above-mentioned drawbacks of the prior art.
- Table 1 shows the codebook of the precoding matrix for Layer 2 transmission.
- the channel quality estimation according to the reference signal transmission method according to the embodiment of the present invention will reduce the occupation of the SRS resource by a factor of two.
- the reference signal transmitting method according to an embodiment of the present invention can further reduce system interference and increase the accuracy of system channel quality estimation by occupying less SRS resources.
- the first precoding matrix and the second precoding matrix may be mutually orthogonal.
- the mobile station is equipped with four antennas.
- the precoding matrix Pdata [l 1 0 0; 0 0 1 - ⁇
- the precoding matrix Psrs [l -1 0 0; 0 0 1 j] T ⁇ t SRS signal
- the precoding matrix Pdata and the precoding matrix Psrs are orthogonal to each other.
- the channel quality estimation values obtained according to the received pre-coded DMRS are 1 ⁇ 14 ⁇ ⁇ and h 2 , dmrs , and channel estimation based on the received pre-coded SRS is obtained. Values are h rs and h
- Hantee n ( ⁇ 1, 2, 3, 4 ⁇ ) is the channel shield estimate for the nth antenna, and na, nb, nc, and nd are noise.
- precoding matrix employed in the above-described examples of the first embodiment of the present invention is merely exemplary and not limiting. Those skilled in the art can flexibly set different precoding matrices according to the needs of practical applications to meet the application requirements of the actual wireless communication system, and all of them should be within the spirit and scope of the claimed invention.
- the first precoding matrix and the second precoding matrix may be preset by the base station and notify the mobile station.
- the mobile station may only preset and notify the mobile station of the first precoding matrix, and after receiving the first precoding matrix, the mobile station according to the first precoding matrix and the predefined A second precoding matrix is determined by a correspondence between the first precoding matrix and the second precoding matrix.
- the first The precoding matrix and the second precoding matrix may be changed by the base station from time to time and notified to the mobile station.
- FIG. 2 shows a flow chart of a reference signal transmitting method according to a second embodiment of the present invention.
- the reference signal transmitting method according to the first embodiment of the present invention starts from step S201.
- step S201 a first precoding matrix and a second precoding matrix for precoding the data transmitted by the mobile station to the plurality of antennas to be transmitted by the mobile station are preset and notified by the base station, wherein Different columns and different rows of the first precoding matrix and the second precoding matrix respectively correspond to different data and different antennas, and are used by all column vectors in the first precoding matrix and in the second precoding matrix
- the rank of the matrix formed by arranging all the column vectors is greater than or equal to the number of antennas of the mobile station.
- step S202 the demodulation reference signal to be transmitted along with the data described in step S201 is precoded according to the first precoding matrix, and according to the second precoding matrix pair to be accompanied by the step S201
- the sounding reference signal transmitted by the data is precoded.
- step S203 the precoded sounding reference signal and the precoded demodulation reference signal are transmitted.
- first precoding matrix and the second precoding matrix and the like used in this embodiment can be flexibly selected and set according to the requirements of a specific application to satisfy an actual wireless communication system.
- the application needs are within the spirit and scope of the claims as claimed.
- the reference signal transmitting method pre-predicts the DMRS and the SRS according to the first precoding matrix and the second precoding matrix which are preset and notified to the mobile station by the base station, respectively.
- Encoding, and the rank of the matrix formed by arranging all the column vectors in the two precoding matrices is greater than or equal to the number of the antennas, so that the base station side can combine the DMRS and the SRS to perform channel quality estimation of each antenna.
- the reference signal transmitting method according to Embodiment 2 of the present invention effectively reduces the occupation of SRS resources in antenna channel quality estimation by using precoding DMRS and precoded SRS in combination, and also avoids using precoding separately.
- the DMRS cannot perform the shortcomings of the signal estimation of each antenna.
- the reference signal transmitting method according to Embodiment 2 of the present invention is performed by combining the precoded DMRS and the precoded SRS by enabling the base station side to perform the combination based on the precoded DMRS and the precoded SRS.
- Channel quality estimation therefore, does not require two receivers, and also reduces the occupation of cyclic shift resources, thereby overcoming the above-discussed shortcomings of the prior art.
- the first precoding matrix and the second precoding matrix may be mutually orthogonal.
- the first precoding matrix and the second precoding matrix may be changed by the base station from time to time and notified to the mobile station.
- the present invention also provides a channel quality estimation method applied to a base station.
- FIG. 3 is a flow chart showing a channel quality estimation method according to Embodiment 3 of the present invention.
- the channel quality estimation method according to Embodiment 3 of the present invention starts from step S301.
- step S301 channel estimation is performed according to the received demodulation reference signal precoded by the first precoding matrix transmitted from the plurality of antennas accompanying data of the mobile station to obtain a demodulation reference signal channel estimation value. And using the second pre-behaved estimate according to the received data transmitted with the data, wherein different columns and different rows of the first precoding matrix and the second precoding matrix respectively correspond to different data and different antennas .
- step S302 according to the first precoding matrix and the obtained demodulation reference signal channel estimation, the first system of equations with the channel quality estimation value of the corresponding antenna is derived, and according to the second precoding
- the matrix and the obtained sounding reference signal channel estimates are derived from a second system of equations in which the channel quality estimates of the respective antennas are variables, wherein all columns in the first precoding matrix and all columns in the second precoding matrix
- the rank of the matrix formed by the vector arrangement is greater than or equal to the number of the antennas.
- step S303 channel estimation values of the respective antennas are calculated by combining the first system of equations and the second system of equations.
- first precoding matrix and the second precoding matrix and the like used in this embodiment can be flexibly selected and set according to the requirements of a specific application to satisfy an actual wireless communication system.
- the application needs are within the spirit and scope of the claims as claimed.
- the channel quality estimation method according to Embodiment 3 of the present invention is obtained by precoding according to the received demodulation reference signal precoded by the first precoding matrix and using the second precoding matrix, respectively. Performing channel estimation on the sounding reference signal to obtain a demodulation reference signal channel estimation value and a sounding reference signal channel estimation value, respectively, and all the column vectors in the two precoding matrices are arranged to form a matrix having a rank greater than or equal to the antenna The number of channels can be combined to utilize DMRS and SRS for channel quality estimation of each antenna.
- the channel quality estimation method according to Embodiment 3 of the present invention performs channel quality estimation of each antenna by using pre-coded DMRS and pre-coded SRS in combination, thereby effectively reducing occupation of SRS resources in antenna channel quality estimation. At the same time, the disadvantage of not being able to perform channel quality estimation of each antenna by using the precoded DMRS alone is also avoided.
- the channel quality estimation method according to Embodiment 3 of the present invention does not require two receivers because channel quality estimation is performed in combination by precoding-based DMRS and pre-coded SRS, and also The occupation of cyclic shift resources is reduced, thereby overcoming the above disadvantages of the prior art.
- the number of cyclic shift resources to be used is six.
- the channel quality estimation method according to the third embodiment of the present invention since channel quality estimation is performed by using a combination of pre-coded DMRS and pre-coded SRS, only four cyclic shift resources are needed to obtain each antenna.
- the channel quality estimation method according to the third embodiment of the present invention performs channel quality estimation to reduce the occupation of SRS resources by a factor of two.
- the channel quality estimation method according to Embodiment 3 of the present invention can further reduce system interference and increase the accuracy of system channel shield estimation by occupying less SRS resources.
- the first precoding matrix and the second precoding matrix may be mutually orthogonal.
- the mobile station is equipped with four antennas.
- Hante n (ne ⁇ l, 2, 3, 4 ⁇ ) is the channel quality estimate of the nth antenna, na nb nc and nd are noise 0
- the first precoding matrix and the second precoding matrix may be preset by the base station and notify the mobile station.
- the mobile station may only preset and notify the mobile station of the first precoding matrix, and after receiving the first precoding matrix, the mobile station according to the first precoding matrix and the predefined A second precoding matrix is determined by a correspondence between the first precoding matrix and the second precoding matrix.
- the first precoding matrix and the second precoding matrix may be changed by the base station from time to time and notified to the mobile station.
- FIG. 4 shows a flow chart of a channel quality estimation method according to Embodiment 4 of the present invention.
- the channel quality estimation method according to Embodiment 4 of the present invention starts from step S401.
- the first precoding matrix and the second precoding matrix are preset by the base station and notify the mobile station.
- the mobile station may only pre-set and notify the mobile station of the first precoding matrix, and after receiving the first precoding matrix, the mobile station according to the first precoding matrix and the predefined first precoding matrix and the first A second precoding matrix is determined by a corresponding manner between the two precoding matrices.
- channel estimation is performed according to the received demodulation reference signal precoded by the first precoding matrix transmitted from the plurality of antennas accompanying data of the mobile station to obtain a demodulation reference signal channel. Estimating a value and using the first signal channel estimate according to the received data transmitted with the data, wherein different columns and different rows of the first precoding matrix and the second precoding matrix respectively correspond to different data and different antennas .
- step S403 according to the first precoding matrix and the obtained demodulation reference signal channel estimation, the first system of equations with the channel quality estimation value of the corresponding antenna is derived, and according to the second precoding
- the matrix and the obtained sounding reference signal channel estimates are derived from a second system of equations in which the channel quality estimates of the respective antennas are variables, wherein all columns in the first precoding matrix and all columns in the second precoding matrix
- the rank of the matrix formed by the vector arrangement is greater than or equal to the number of the antennas.
- step S404 the channel volume estimation values of the respective antennas are calculated by combining the first system of equations and the second system of equations.
- first precoding matrix and the second precoding matrix and the like used in this embodiment can be flexibly selected and set according to the requirements of a specific application to satisfy an actual wireless communication system.
- the application needs are within the spirit and scope of the claims as claimed.
- the channel quality estimation method is configured by using a demodulation reference signal precoded by a first precoding matrix preset by a base station and a second preset by a base station, respectively. Precoding the pre-coded sounding reference signal to perform channel estimation to obtain a demodulated reference signal channel estimation value and a sounding reference signal channel estimation value, respectively, and a matrix formed by arranging all column vectors in the two precoding matrices The rank is greater than or equal to the number of antennas, so that channel quality estimation of each antenna can be performed in combination with DMRS and SRS.
- the channel quality estimation method according to Embodiment 3 of the present invention performs channel quality estimation of each antenna by using pre-coded DMRS and pre-coded SRS in combination, thereby effectively reducing occupation of SRS resources in antenna channel quality estimation. At the same time, the disadvantage of not being able to perform channel quality estimation of each antenna by using the precoded DMRS alone is also avoided.
- the channel quality estimation method according to the third embodiment of the present invention does not require two receivers because the channel quality estimation is performed in combination by the precoding-based DMRS and the pre-coded SRS, and also Overcoming the prior art by reducing the occupation of cyclic shift resources The above shortcomings.
- the first precoding matrix and the second precoding matrix may be mutually orthogonal.
- the first precoding matrix and the second precoding matrix may be changed by the base station from time to time and notified to the mobile station.
- the predetermined reference signal period can be flexibly set according to the requirements of the actual application to meet the delay requirement between the reference signal of the actual wireless communication system and the CQI feedback. All should be within the spirit and scope of the claimed invention.
- a mobile station using a reference signal transmitting method according to an embodiment of the present invention a base station using a channel quality estimating method according to an embodiment of the present invention, and an upper multi-motion station and a base station Wireless communication system.
- Figure 5 shows a schematic diagram of a mobile station 500 in accordance with a fifth embodiment of the present invention.
- the mobile station 500 includes a precoding unit 501 and a transmitting unit 502.
- the precoding unit 501 is configured to precode the demodulation reference signal to be accompanied by the data transmission according to the first precoding matrix for precoding the data to be transmitted through the plurality of antennas, and according to The second precoding matrix precodes the sounding reference signal to be accompanied by the data transmission, wherein different columns and different rows of the first precoding matrix and the second precoding matrix respectively correspond to different data and different antennas And the rank of the matrix formed by arranging all the column vectors in the first precoding matrix and all the column vectors in the second precoding matrix is greater than or equal to the number of the antennas.
- the transmitting unit 502 is configured to transmit the precoded sounding reference signal and the precoded demodulation reference signal.
- the first precoding matrix and the second precoding matrix and the like used in this embodiment can be flexibly selected and set according to the requirements of a specific application to satisfy an actual wireless communication system. The application needs are within the spirit and scope of the claims as claimed.
- each unit in the mobile station 500 according to Embodiment 5 of the present invention may refer to the specific steps of the steps of the reference signal transmitting method in the wireless communication system according to Embodiment 1 of the present invention described above. achieve. Therefore, for the sake of clarity of the description, the specific implementation of each of the above units will not be described in detail herein.
- the mobile station 500 pre-codes the DMRS and the SRS according to the first precoding matrix and the second precoding matrix, respectively, and all the column vectors in the two precoding matrices.
- the rank of the matrix formed by the alignment is greater than or equal to the number of the antennas, so that the channel quality estimation of each antenna can be performed by using the DMRS and the SRS in combination with the corresponding base station side.
- the mobile station 500 effectively reduces the occupation of SRS resources in the antenna channel quality estimation by using the pre-coded DMRS and the pre-coded SRS in combination, and also avoids the use of precoding alone.
- the DMRS cannot perform the shortcomings of channel quality estimation for each antenna.
- the mobile station 500 performs signal processing in combination with the pre-coded DMRS and the pre-coded SRS by transmitting the pre-coded DMRS and the pre-coded SRS. It is estimated that therefore, two receivers are also not required, and the occupation of cyclic shift resources is also reduced, thereby overcoming the above-mentioned drawbacks of the prior art.
- the first precoding matrix and the second precoding matrix may be preset by the base station and notify the mobile station.
- the mobile station may only preset and notify the mobile station of the first precoding matrix, and after receiving the first precoding matrix, the mobile station according to the first precoding matrix and the predefined A second precoding matrix is determined by a correspondence between the first precoding matrix and the second precoding matrix.
- the first precoding matrix and the second precoding matrix may be orthogonal to each other.
- the first precoding matrix and the second precoding matrix may be changed by the base station from time to time and notified to the mobile station.
- FIG. 6 shows a schematic diagram of a base station 600 in accordance with a sixth embodiment of the present invention.
- the base station 600 includes a channel estimating unit 601, a first arithmetic unit 602, and a second arithmetic unit 603.
- the channel estimation unit 601 is configured to perform channel estimation to obtain a demodulation reference signal according to the received demodulation reference signal precoded by the first precoding matrix transmitted from the plurality of antennas accompanying data of the mobile station. a channel estimation value, and performing channel estimation according to the received sounding reference signal precoded by the second precoding matrix that is transmitted along with the data to obtain a sounding reference signal channel estimation value, wherein the first precoding matrix and the second pre The different columns and different rows of the coding matrix correspond to different data and different antennas, respectively.
- the first operation unit 602 is configured to: according to the first precoding matrix and the obtained demodulation reference signal channel estimation, derive a first system of equations with a channel quality estimation value of the corresponding antenna, and according to the second
- the precoding matrix and the obtained sounding reference signal channel estimate are derived from a second system of equations in which the channel quality estimates of the respective antennas are variables, wherein all of the column vectors in the first precoding matrix and the second precoding matrix
- the rank of the matrix formed by arranging all the column vectors is greater than or equal to the number of the antennas.
- the second arithmetic unit 603 is configured to calculate channel quality estimates for the respective antennas by combining the first system of equations and the second set of equations.
- first precoding matrix and the second precoding matrix and the like used in this embodiment can be flexibly selected and set according to the requirements of a specific application to satisfy an actual wireless communication system.
- the application needs are within the spirit and scope of the claims as claimed.
- a specific implementation of each unit in the base station 600 according to Embodiment 6 of the present invention may refer to the specific implementation of the respective steps of the channel quality estimation method according to Embodiment 3 of the present invention described above. Therefore, for the sake of brevity of the description, the specific implementation of each of the above units will not be described in detail herein.
- the base station 600 passes the demodulation reference signal precoded by using the first precoding matrix and the sounding reference signal precoded by the second precoding matrix, respectively.
- the rank of the matrix formed by the columns is greater than or equal to the number of the antennas, so that the channel quality estimation of each antenna can be performed by using DMRS and SRS in combination.
- the base station 600 performs channel quality estimation of each antenna by using the pre-coded DMRS and the pre-coded SRS in combination, thereby effectively reducing the occupation of the SRS resources in the antenna channel quality estimation, and also The disadvantage of not being able to perform channel quality estimation of each antenna by using the precoded DMRS alone is avoided.
- the base station 600 since the base station 600 according to the embodiment of the present invention performs channel quality estimation in combination by precoding-based DMRS and pre-coded SRS, two receivers are also unnecessary, and the cyclic shift is also reduced.
- the occupation of bit resources overcomes the above disadvantages of the prior art.
- the first precoding matrix and the second precoding matrix may be preset by the base station and notify the mobile station.
- the mobile station may only preset and notify the mobile station of the first precoding matrix, and after receiving the first precoding matrix, the mobile station according to the first precoding matrix and the predefined A second precoding matrix is determined by a correspondence between the first precoding matrix and the second precoding matrix.
- the first precoding matrix and the second precoding matrix may be orthogonal to each other.
- the first precoding matrix and the second precoding matrix may be changed by the base station from time to time and notified to the mobile station.
- Figure 7 shows a schematic diagram of a wireless communication system 700 in accordance with a seventh embodiment of the present invention.
- the wireless communication system 700 includes a mobile station 701 and a base station 702.
- the mobile station 701 includes a precoding unit 703 and a transmitting unit 704.
- the precoding unit 703 is configured to precode the demodulation reference signal to be accompanied by the data transmission according to a first precoding matrix for precoding the data to be transmitted through the plurality of antennas, And precoding the sounding reference signal to be sent along with the data according to the second precoding matrix, different columns of the first precoding matrix and the second precoding matrix And different rows respectively corresponding to different data and different antennas, the ranks of the matrix formed by arranging all the column vectors in the first precoding matrix and all the column vectors in the second precoding matrix are greater than or equal to The number of the antennas.
- the transmitting unit 704 is configured to transmit the precoded sounding reference signal and the precoded demodulation reference signal.
- the base station 702 includes a channel estimation unit 705, a first arithmetic unit 706, and a second arithmetic unit.
- the channel estimation unit 705 is configured to perform channel estimation to obtain a demodulation reference signal according to the received demodulation reference signal precoded by the first precoding matrix transmitted from the plurality of antennas accompanying data of the mobile station. a channel estimation value, and performing channel estimation according to the received sounding reference signal precoded by the second precoding matrix that is transmitted along with the data to obtain a sounding reference signal channel estimation value, the first precoding matrix and the The different columns and different rows of the second precoding matrix correspond to different data and different antennas, respectively.
- the first operation unit 706 is configured to estimate, according to the first precoding matrix and the obtained demodulation reference signal channel estimate, a first system of equations with a channel shield estimation value of the corresponding antenna, and Deriving a second set of equations with a channel quality estimate value of the corresponding antenna based on the second precoding matrix and the obtained sounding reference signal channel estimate, wherein all column vectors in the first precoding matrix are The rank of the matrix formed by arranging all the column vectors in the second precoding matrix is greater than or equal to the number of the antennas.
- the second arithmetic unit 707 is configured to calculate channel quality estimates for the respective antennas by combining the first system of equations and the second set of equations.
- first precoding matrix and the second precoding matrix and the like used in this embodiment can be flexibly selected and set according to the requirements of a specific application to satisfy an actual wireless communication system.
- the application needs are within the spirit and scope of the claims as claimed.
- each unit in the wireless communication system 700 according to Embodiment 7 of the present invention reference may be made to the reference signal transmitting method according to Embodiment 1 of the present invention and the channel quality according to Embodiment 3 of the present invention. Estimate the specific implementation of each step of the method. Therefore, for the sake of brevity of the description, the specific implementation of each of the above units will not be described in detail herein.
- the base station 702 in the wireless communication system 700 passes the solution pre-coded by the first precoding matrix received from the mobile station 701, respectively. And performing channel estimation by adjusting the reference signal and the sounding reference signal pre-coded by the second precoding matrix received from the mobile station 701 to obtain a demodulation reference signal channel estimation value and a sounding reference signal channel estimation value, respectively.
- the ranks of the matrices formed by arranging all the column vectors in the precoding matrices are greater than or equal to the number of the antennas, so that the channel quality estimation of each antenna can be performed by using DMRS and SRS in combination.
- the wireless communication system 700 performs channel quality estimation of each antenna by using a pre-coded DMRS and a pre-coded SRS, thereby effectively reducing the occupation of SRS resources in the antenna channel quality estimation.
- the disadvantage of not being able to perform channel quality estimation of each antenna by using the precoded DMRS alone is also avoided.
- the wireless communication system 700 does not require two receivers because the channel quality estimation is performed in combination by the precoding-based DMRS and the pre-coded SRS, and also reduces the pair.
- the occupation of cyclic shift resources overcomes the above disadvantages of the prior art.
- the first precoding matrix and the second precoding matrix may be preset by the base station and notify the mobile station.
- the mobile station may only preset and notify the mobile station of the first precoding matrix, and after receiving the first precoding matrix, the mobile station according to the first precoding matrix and the predefined A second precoding matrix is determined by a correspondence between the first precoding matrix and the second precoding matrix.
- the first precoding matrix and the second precoding matrix may be orthogonal to each other.
- the first precoding matrix and the second precoding matrix may be changed by the base station from time to time and notified to the mobile station.
- wireless communication system 700 according to the present embodiment has been described above with reference to the schematic diagram shown in FIG. 7, those skilled in the art should understand that the schematic diagram shown in FIG. 7 is merely an example. The present invention is not limited to the scope of the present invention, and those skilled in the art can modify or modify the schematic diagram shown in FIG. 7 according to actual needs.
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Description
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Priority Applications (7)
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CN201080067456XA CN102948186A (zh) | 2010-06-21 | 2010-06-21 | 参考信号发送方法、信道质量估计方法、移动台、基站和无线通信系统 |
KR1020137000904A KR101348052B1 (ko) | 2010-06-21 | 2010-06-21 | 기준 신호 송신 방법, 채널 품질 추정 방법, 이동국, 기지국 및 무선 통신 시스템 |
PCT/CN2010/074144 WO2011160277A1 (zh) | 2010-06-21 | 2010-06-21 | 参考信号发送方法、信道质量估计方法、移动台、基站和无线通信系统 |
EP10853420.7A EP2584810A1 (en) | 2010-06-21 | 2010-06-21 | Method for reference signal transmission, method for channel quality estimation, mobile station, base station, and wireless communication system |
CA2803043A CA2803043A1 (en) | 2010-06-21 | 2010-06-21 | Method for reference signal transmission, method for channel quality estimation, mobile station, base station and wireless communication system |
JP2013515656A JP5494888B2 (ja) | 2010-06-21 | 2010-06-21 | 参照信号送信方法、チャネル品質推定方法、移動局、基地局及び無線通信システム |
US13/719,969 US20130107746A1 (en) | 2010-06-21 | 2012-12-19 | Method for reference signal transmission, method for channel quality estimation, mobile station, base station and wireless communication system |
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PCT/CN2010/074144 WO2011160277A1 (zh) | 2010-06-21 | 2010-06-21 | 参考信号发送方法、信道质量估计方法、移动台、基站和无线通信系统 |
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US13/719,969 Continuation US20130107746A1 (en) | 2010-06-21 | 2012-12-19 | Method for reference signal transmission, method for channel quality estimation, mobile station, base station and wireless communication system |
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US (1) | US20130107746A1 (zh) |
EP (1) | EP2584810A1 (zh) |
JP (1) | JP5494888B2 (zh) |
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CN (1) | CN102948186A (zh) |
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US10122559B2 (en) * | 2016-03-21 | 2018-11-06 | Qualcomm Incorporated | Uplink channel quality measurement using a subframe with high-intensity reference signal bursts |
CN107786473B (zh) * | 2016-08-31 | 2020-09-08 | 华为技术有限公司 | 信道估计方法、参考信号发送方法、装置及系统 |
CN108259401B (zh) * | 2016-12-28 | 2020-09-15 | 电信科学技术研究院 | 参考信号发送方法和相位噪声确定方法及相关装置 |
US11018828B2 (en) * | 2017-02-06 | 2021-05-25 | Qualcomm Incorporated | Uplink MIMO reference signals and data transmission schemes |
US10367553B2 (en) * | 2017-03-24 | 2019-07-30 | Mediatek Inc. | Transmission scheme for wireless communication systems |
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EP4264893A1 (en) * | 2020-12-18 | 2023-10-25 | Telefonaktiebolaget LM Ericsson (publ) | Controlling transmisson of reference signals |
CN113872651B (zh) * | 2021-10-12 | 2022-12-27 | 京信网络系统股份有限公司 | 预编码矩阵的获取方法、装置、基站及存储介质 |
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JP5494888B2 (ja) | 2014-05-21 |
CA2803043A1 (en) | 2011-12-29 |
CN102948186A (zh) | 2013-02-27 |
EP2584810A1 (en) | 2013-04-24 |
US20130107746A1 (en) | 2013-05-02 |
KR101348052B1 (ko) | 2014-01-03 |
JP2013534758A (ja) | 2013-09-05 |
KR20130031889A (ko) | 2013-03-29 |
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