WO2010069264A1 - 信道的秩的估计方法、系统及装置 - Google Patents

信道的秩的估计方法、系统及装置 Download PDF

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Publication number
WO2010069264A1
WO2010069264A1 PCT/CN2009/075684 CN2009075684W WO2010069264A1 WO 2010069264 A1 WO2010069264 A1 WO 2010069264A1 CN 2009075684 W CN2009075684 W CN 2009075684W WO 2010069264 A1 WO2010069264 A1 WO 2010069264A1
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Prior art keywords
channel
rank
user equipment
base station
uplink
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PCT/CN2009/075684
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English (en)
French (fr)
Inventor
缪德山
孙韶辉
秦飞
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大唐移动通信设备有限公司
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Publication of WO2010069264A1 publication Critical patent/WO2010069264A1/zh

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613Diversity 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
    • H04B7/0615Diversity 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
    • H04B7/0619Diversity 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
    • H04B7/0621Feedback content
    • H04B7/063Parameters other than those covered in groups H04B7/0623 - H04B7/0634, e.g. channel matrix rank or transmit mode selection
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/003Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048Allocation of pilot signals, i.e. of signals known to the receiver

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a method, system and apparatus for estimating a rank of a channel. Background technique
  • the common pilot is common to the cell.
  • FIG. 1A and FIG. 1B Schematic diagram of common pilot mapping for regular CP (Cyclic Prefix) and extended CP, transmitted over full bandwidth.
  • the dedicated pilot is based on UE (User Equipment), that is, each user can only receive its own dedicated pilot signal.
  • the port number of the dedicated pilot is 5, as shown in FIG. 2A and FIG. 2B, which are respectively schematic diagrams of dedicated pilot mappings of the conventional CP and the extended CP in the prior art, where the user-specific reference symbols, shadows are indicated. Partially indicates the common pilot signal on antenna ports 0, 1.
  • rank adaptation refers to the switching of the number of transmitted data streams according to the rank of the channel. If the rank of the channel is 1, a stream is transmitted, and the number of dedicated pilot ports required is at least 1; if the rank of the channel If it is equal to 2, the number of transmitted data streams is 2, and the number of dedicated pilot ports corresponding to it is at least 2. Therefore, when the UE is in the multi-stream beamforming transmission mode, how to judge the rank value is very important. And because the common port pilot and the rank of the dedicated port do not have a corresponding relationship, the estimation of the rank value by the UE during the multi-stream beamforming transmission may be less accurate. Summary of the invention
  • the object of the present invention is to at least solve one of the above-mentioned technical drawbacks, and in particular to solve the technical drawbacks of the currently no scheme for estimating the rank value.
  • a method for estimating a rank of a channel in a multi-stream beamforming transmission includes the following steps:
  • the base station receives a CQI detected by a UE that is fed back by a user equipment UE according to a common pilot (Channel)
  • the base station estimates the uplink channel information according to the uplink sounding pilot signal sent by the UE; the base station acquires the rank of the channel according to the CQI fed back by the UE and the estimated uplink channel information.
  • a system for estimating a rank of a channel in a multi-stream beamforming transmission comprising: a base station and at least one UE served by a base station, a UE, configured to detect a CQI according to a common pilot, and detect the detected The CQI is fed back to the base station, and the uplink sounding pilot signal is sent to the base station.
  • the base station is configured to receive the CQI fed back by the UE, and estimate the uplink channel information according to the uplink sounding pilot signal sent by the UE, and the CQI and the estimated uplink according to the UE feedback.
  • the channel information acquires the rank of the channel.
  • a base station including a CQI receiving module, an uplink channel information estimating module, a channel rank acquiring module, and a CQI receiving module, configured to receive a CQI detected by a UE according to a common pilot, and an uplink channel.
  • an information estimation module configured to estimate uplink channel information according to the uplink sounding pilot signal sent by the UE; and a channel rank obtaining module, configured to acquire a rank of the channel according to the CQI fed back by the UE and the estimated uplink channel information.
  • a method for estimating a rank of a channel in a multi-stream beamforming transmission including the following steps: the UE estimates the SINR value of the channel according to the common pilot; and performs eigenvalue decomposition on the common pilot signal by the UE. Obtaining a feature value of the channel ⁇ '; the UE acquires the rank of the channel according to the SINR value and the characteristic value of the channel ⁇ '; the UE feeds back the rank of the acquired channel to the base station.
  • a system for estimating a rank of a channel in a multi-stream beamforming transmission comprising: a base station and at least one UE served by a base station, the UE, configured to estimate a SINR value of the channel according to the common pilot, and Performing eigenvalue decomposition on the common pilot signal, acquiring the eigenvalue of the channel, and acquiring the rank of the channel according to the SINR value and the eigenvalue of the channel, and feeding back the rank of the obtained channel to the base station; the base station is configured to receive the UE feedback The rank of the channel taken by the UE.
  • a UE including an SINR value estimation module and a channel.
  • the eigenvalue channel rank obtaining module is configured to obtain the rank of the channel according to the SINR value estimated by the SINR value estimation module and the eigenvalue of the channel acquired by the channel eigenvalue acquisition module, and the feedback module, configured to acquire the channel acquired by the channel rank acquisition module The rank is fed back to the base station.
  • a base station including a receiving module, a CQI receiving module, an uplink channel information estimating module, a channel rank obtaining module, and a comparing module, where the receiving module is configured to receive a rank of a channel acquired by the UE fed back by the UE.
  • a CQI receiving module configured to receive a CQI that is detected by the UE by the UE according to the common pilot; an uplink channel information estimating module, configured to estimate uplink channel information according to the uplink sounding pilot signal sent by the UE; and a channel rank acquiring module, configured to The CQI and the estimated uplink channel information fed back by the UE acquire the rank of the channel; the comparison module is configured to compare the rank of the channel fed back by the UE received by the receiving module with the rank of the channel acquired by the channel rank obtaining module, and select a suitable one of the two As the rank of the final channel.
  • a method for estimating a rank of a channel in a multi-stream beamforming transmission including the following steps: the UE estimates the SINR value of each beamforming data stream according to each dedicated pilot signal, or according to a common The pilot signal estimates the SINR value of the channel; the UE acquires the rank of the channel according to the estimated SINR value of each beamformed data stream or the SINR value of the channel; the UE feeds back the rank of the acquired channel to the base station.
  • a system for estimating a rank of a channel in a multi-stream beamforming transmission comprising: a base station and at least one UE served by a base station, and a UE, configured to estimate each beamforming according to each dedicated pilot signal.
  • SINR value of the data stream, or estimating the SINR value of the channel according to the common pilot signal and acquiring the rank of the channel according to the estimated SINR value of each beamforming data stream or the SINR value of the channel, and feeding back the rank of the obtained channel to a base station, configured to receive a rank of a channel taken by a UE fed back by the UE.
  • a UE including an SINR value estimation module, a channel rank acquisition module, and a feedback module, and an SINR value estimation module, configured to estimate SINR values of each beamformed data stream according to each dedicated pilot signal. Or estimating the SINR value of the channel according to the common pilot signal; the channel rank obtaining module, configured to shape the SINR value of the data stream according to the estimated beam or The SINR value of the channel acquires the rank of the channel; and the feedback module is configured to feed back the rank of the channel acquired by the channel rank obtaining module to the base station.
  • a method for estimating a rank of a channel in a multi-stream beamforming transmission includes the following steps: the base station receives a channel quality indicator CQI detected by the UE that is fed back by the user equipment UE according to the common pilot; The uplink channel information is estimated according to the uplink data demodulation reference signal sent by the UE or the demodulation reference signal of the uplink control channel; the base station acquires the rank of the channel according to the CQI fed back by the UE and the estimated uplink channel information.
  • a method for estimating a rank of a channel during downlink data transmission includes the following steps: the base station receives a channel quality indicator CQI detected by the UE that is fed back by the user equipment UE according to the common pilot; The base station estimates the uplink channel information according to the uplink signal sent by the UE; the base station acquires the rank of the channel according to the CQI fed back by the UE and the estimated uplink channel information.
  • an apparatus for estimating a rank of a channel during downlink data transmission including: a receiving module, configured to receive, by a user equipment, a channel quality indicator channel quality indicator that is detected by a user equipment according to a common pilot.
  • the channel information estimation module is configured to estimate the uplink channel information according to the uplink signal sent by the user equipment, and the channel rank obtaining module acquires the rank of the channel according to the channel quality indicator and the estimated uplink channel information fed back by the user equipment.
  • the invention effectively solves the estimation of the rank value, thereby supporting rank adaptive transmission during multi-stream beamforming transmission and downlink data transmission, thereby improving system flexibility.
  • FIG. 1A and FIG. 1B are schematic diagrams of common pilot mapping of a conventional CP and an extended CP in an LTE system in the prior art
  • 2A and 2B are respectively schematic diagrams of dedicated pilot mapping of a conventional CP and an extended CP in the prior art; 3 is a flowchart of a method for estimating a rank value of a channel during multi-stream beamforming transmission according to Embodiment 1 of the present invention;
  • FIG. 4 is a structural diagram of an estimation system for a rank value of a channel during multi-stream beamforming transmission according to Embodiment 1 of the present invention
  • FIG. 5 is a flow chart of a method for estimating a rank of a channel in a multi-stream beamforming transmission according to Embodiment 2 of the present invention.
  • FIG. 6 is a structural diagram of an estimation system for a rank value of a channel in a multi-stream beamforming transmission according to Embodiment 2 of the present invention.
  • FIG. 7 is a flowchart of an estimation method of a rank value of a channel in a multi-stream beamforming transmission according to Embodiment 3 of the present invention.
  • FIG. 8 is a structural diagram of an estimation system for a rank value of a channel during multi-stream beamforming transmission according to Embodiment 3 of the present invention.
  • FIG. 9 is a flow chart of a method for estimating a rank of a channel during downlink data transmission according to Embodiment 4 of the present invention.
  • Figure 10 is a block diagram of an apparatus for estimating a rank of a channel during downlink data transmission according to a fourth embodiment of the present invention. detailed description
  • the present invention mainly utilizes the symmetry of uplink and downlink channels of a TDD (Time Division Duplex) system, and estimates the rank value of the channel by using compensation.
  • the rank value of the channel can be obtained in various manners, such as being acquired by the base station, or acquired by the UE, or both the base station and the UE acquiring and finally selecting by the base station. Among them, how to obtain the rank value of the channel is also diverse, which will be described in detail in the following embodiments.
  • FIG. 3 it is a flowchart of a method for estimating a rank value of a channel in a multi-stream beamforming transmission according to Embodiment 1 of the present invention.
  • the base station estimates the rank value of the channel, including the following steps:
  • Step S301 The UE estimates a CQI of the downlink bandwidth according to the available common pilot.
  • the number of common pilot ports that can be used depends on the common pilot signal sent by the base station, and the UE performs detection on the PBCH (Physical Broadcast Channel) information to obtain the number of actually transmitted ports.
  • PBCH Physical Broadcast Channel
  • the manner in which the UE estimates the CQI according to the common pilot is notified to the UE by the high layer signaling of the base station, wherein the method for estimating the CQI may be based on the transmit diversity mode.
  • Other methods are used, either broadband-based or sub-band based.
  • Step S302 The UE feeds back the detected CQI to the base station.
  • the manner in which the UE feeds back is also notified by the base station, wherein periodic feedback or aperiodic feedback may be used.
  • Step S303 the UE sends an uplink sounding (sounding) signal to the base station, and may also send other uplink signals, such as an uplink data demodulation reference signal or a demodulation reference signal of an uplink control channel, as long as the uplink channel information can be estimated, It is handled in a similar manner to the uplink sounding pilot signal.
  • the terminal antenna may be used to transmit and send an uplink sounding pilot signal to obtain the entire uplink channel information. If the terminal can support multiple antenna port transmission, multiple antennas may be used for simultaneous transmission.
  • the uplink detection pilot signal or the multi-antenna handover transmits the uplink detection pilot signal, wherein the multi-antenna uplink detection pilot signal transmission manner may be TDM (Time-Division Multiplexing), or code division CDM (Code) -Division Multiplexing, code division multiplexing).
  • TDM Time-Division Multiplexing
  • CDM Code division CDM
  • Step S304 The base station estimates uplink channel information according to the uplink sounding pilot signal sent by the UE.
  • the uplink channel information may be estimated in the following manner.
  • the following manner is only one type of estimating the uplink channel information, and those skilled in the art may also enter other manners. It is estimated that these other ways should also be included in the scope of the present invention.
  • the uplink sounding pilot signal is that the UE transmits a fixed pilot sequence and transmits in a specified frequency band. If only one uplink sounding pilot signal is transmitted in one frequency band, the base station side can divide the received signal by the transmitted signal. Frequency sequence, obtaining channel information. specific:
  • each uplink sounding pilot signal needs to be distinguished by using different pilot sequences.
  • the channel information estimation needs to first divide the received signal by the specified pilot sequence, and then The received frequency domain signal is converted into the time domain, and some samples of the time domain signal are taken according to the application scenario of the cell, and other samples are filled with 0, and then the time domain signal is converted into the frequency domain, and finally the actual uplink channel information is obtained.
  • Step S305 The base station acquires a rank value of the channel according to the CQI fed back by the UE and the estimated uplink channel information.
  • eigenvalue decomposition is performed on the estimated uplink channel information by using the symmetry of the uplink and downlink channels to obtain a corresponding channel feature value 4, and then according to the channel feature value and the UE.
  • the fed back CQI gets the rank value of the channel.
  • the signal-to-noise ratio SINR value corresponding to the UE is obtained according to the CQI fed back by the UE. If the signal-to-noise ratio SINR value of the UE is less than the first threshold, the channel is not suitable for multi-stream beam assignment.
  • the shape is transmitted, so that the rank value of the channel is directly determined as a preset value, and the preset value is, for example, 1 or 2.
  • the first threshold is obtained according to the system performance preset. Then, the number of valid subchannels is determined according to the channel characteristic value, and the number of the effective subchannels is the rank value of the channel.
  • a method for determining whether a subchannel is valid is provided, for example, a eigenvalue ratio can be calculated, > 1 , and if the eigenvalue ratio is less than the second threshold, the corresponding subchannel is considered invalid. , thereby obtaining the rank value of the channel.
  • the channel capacity calculation may be performed according to the estimated SINR value and the SINR of the actual each subchannel derived according to the calculated eigenvalue, at different rank values. Next, the larger the total channel capacity, the higher the corresponding rank value is considered to be optimal.
  • FIG. 4 it is a system structure diagram for estimating a rank value of a channel in a multi-stream beamforming transmission according to Embodiment 1 of the present invention.
  • the system includes at least one UE 420 o UE 420 served by a base station 410 and a base station 410.
  • the common pilot detects the CQI, and feeds the detected CQI to the base station 410, and sends an uplink sounding pilot signal to the base station 410, where other uplink signals, such as an uplink data demodulation reference signal or an uplink control channel, may also be sent to the base station.
  • the demodulation reference signal can be used as long as the uplink channel information can be estimated.
  • the base station 410 is configured to receive the CQI fed back by the UE 420, and estimate the uplink channel information according to the uplink sounding pilot signal sent by the UE 420, and obtain the rank value of the channel according to the CQI fed back by the UE 420 and the estimated uplink channel information.
  • the base station 410 performs eigenvalue decomposition on the uplink channel information to obtain a corresponding channel feature value, and obtains a rank value of the channel according to the channel feature value and the CQI fed back by the UE 420.
  • the base station 410 includes a CQI receiving module 411, an uplink channel information estimating module 412, and a channel rank obtaining module 413.
  • the CQI receiving module 411 is configured to receive the CQI detected by the UE 420 fed back by the UE 420 according to the common pilot.
  • the uplink channel information estimation module 412 is configured to estimate uplink channel information according to the uplink sounding pilot signal transmitted by the UE 420.
  • the channel rank obtaining module 413 is configured to obtain a rank value of the channel according to the CQI fed back by the UE 420 and the estimated uplink channel information.
  • the channel rank acquisition module 413 includes a channel feature value acquisition sub-module 414 and a channel rank acquisition sub-module 415.
  • the channel feature value obtaining sub-module 414 is configured to perform eigenvalue decomposition on the uplink channel information to obtain a corresponding channel feature value ⁇ .
  • the channel rank acquisition sub-module 415 is configured to obtain a rank value of the channel according to the channel characteristic value and the CQI fed back by the UE 420.
  • the channel rank obtaining module 413 further includes a determining sub-module 416, configured to obtain a signal-to-noise ratio SINR value corresponding to the UE 420 according to the CQI fed back by the UE 420, and a signal-to-noise ratio SINR value corresponding to the UE 420.
  • the threshold is less than the first threshold, the rank value of the channel is judged to be 1.
  • the channel rank obtaining sub-module 413 determines the number of valid subchannels according to the channel characteristic value ⁇ ', wherein the number of valid subchannels is the rank value of the channel.
  • the base station 410 further includes a scheduling module 417, configured to uniformly schedule the manner in which the UE 420 estimates the CQI according to the common pilot, and the manner in which the UE 420 feeds back the CQI to the base station 410.
  • a scheduling module 417 configured to uniformly schedule the manner in which the UE 420 estimates the CQI according to the common pilot, and the manner in which the UE 420 feeds back the CQI to the base station 410.
  • FIG. 5 it is a flowchart of a method for estimating a rank of a channel in a multi-stream beamforming transmission according to Embodiment 2 of the present invention.
  • This embodiment is different from Embodiment 1 in that a rank value of a channel is acquired by a UE and fed back to a base station. , including the following steps:
  • Step S501 The UE estimates a SINR value of the channel according to the common pilot.
  • Step S502 The UE performs eigenvalue decomposition on the common pilot signal to obtain a feature value of the channel.
  • Step S503 The UE acquires a rank value of the channel according to the SINR value and the characteristic value of the channel.
  • the manner in which the UE obtains the rank value of the channel according to the SINR value and the eigenvalue of the channel is similar to that proposed in Embodiment 1, and details are not described herein again.
  • Step S504 The UE feeds back the rank value of the acquired channel to the base station.
  • Step S505 The base station may use the rank value fed back by the UE as the final rank value.
  • the present invention can be combined with the second embodiment.
  • the UE and the base station simultaneously estimate the rank value. After the UE feeds back the estimated rank value to the base station, the base station feeds back the rank value of the UE.
  • the base station calculates the rank value by itself, and determines the final rank value according to a certain criterion. For example, the smallest rank value of the two can be selected as the final rank value.
  • FIG. 6 is a structural diagram of an estimation system for a channel value of a multi-stream beamforming transmission according to Embodiment 2 of the present invention, where the system includes a base station 610. And at least one UE 620 served by base station 610.
  • the UE 620 is configured to estimate the SINR value of the channel according to the common pilot, perform eigenvalue decomposition on the common pilot signal, acquire the eigenvalue ' of the channel, and obtain the rank value of the channel according to the SINR value and the characteristic value of the channel, and The obtained rank value of the channel is fed back to the base station 610.
  • the base station 610 is configured to receive the rank value of the channel acquired by the UE 620 fed back by the UE 620.
  • the UE 620 is further configured to feed back the CQI detected by the UE 620 according to the common pilot signal to the base station 610, and send an uplink sounding pilot signal to the base station 610, where other uplink signals, such as an uplink data demodulation reference signal, may also be sent to the base station. Or the demodulation reference signal of the uplink control channel can be used as long as the uplink channel information can be estimated.
  • the base station 610 is further configured to acquire a rank value of the channel according to the CQI fed back by the UE 620 and the uplink channel information estimated according to the uplink sounding pilot signal sent by the UE 620, and the channel value of the channel acquired by the base station 610 and the channel fed back by the UE 620. The rank values are compared and the appropriate one is chosen as the rank value of the final channel.
  • the UE 620 includes an SINR value estimation module 621, a channel feature value acquisition module 622, a channel rank acquisition module 623, and a feedback module 624.
  • the SINR value estimation module 621 is configured to estimate the SINR value of the channel based on the common pilot.
  • the channel feature value obtaining module 622 is configured to perform eigenvalue decomposition on the common pilot signal to obtain the eigenvalue ⁇ of the channel.
  • the channel rank obtaining module 623 is configured to obtain the rank value of the channel according to the SINR value estimated by the SINR value estimation module 621 and the characteristic value of the channel acquired by the channel feature value obtaining module 622.
  • the feedback module 624 is configured to feed back the rank value of the channel obtained by the channel rank obtaining module 623 to the base station.
  • the channel rank acquisition module 623 includes a channel feature value acquisition sub-module 625 and a channel rank acquisition sub-module 626.
  • the channel feature value obtaining sub-module 625 is configured to perform eigenvalue decomposition on the uplink channel information to obtain a corresponding channel feature value ⁇ .
  • a channel rank obtaining submodule configured to obtain a rank value of the channel according to the channel characteristic value.
  • the channel rank acquisition sub-module determines the number of valid subchannels according to the channel characteristic value, and the number of effective subchannels is the rank value of the channel.
  • the channel rank obtaining module 623 further includes a judging submodule
  • the SNR value of the SNR of the UE 620 is obtained according to the CQI fed back by the UE 620, and when the SNR of the UE 620 is less than the first threshold, the value of the channel is determined to be 1.
  • the base station 610 includes a receiving module 611, a CQI receiving module 612, an uplink channel information estimating module 613, a channel rank obtaining module 614, and a comparing module 615.
  • the receiving module 611 is configured to receive a rank value of a channel acquired by the UE 620 fed back by the UE 620.
  • the CQI receiving module 612 is configured to receive the CQI detected by the UE 620 according to the common pilot fed back by the UE 620.
  • the uplink channel information estimation module 613 is configured to estimate uplink channel information according to the uplink sounding pilot signal sent by the UE 620.
  • the channel rank obtaining module 614 is configured to obtain a rank value of the channel according to the CQI fed back by the UE 620 and the estimated uplink channel information.
  • the comparison module 615 is configured to compare the rank value of the channel fed back by the UE 620 received by the receiving module 611 with the rank value of the channel acquired by the channel rank obtaining module 614, and select a suitable rank value of the channel as the final channel.
  • FIG. 7 is a flowchart of a method for estimating a rank value of a channel in a multi-stream beamforming transmission according to Embodiment 3 of the present invention. This embodiment is basically similar to Embodiment 2, except that the UE estimates the rank value of the channel. The method is different, including the following steps:
  • Step S701 The UE estimates the SINR value of each beamformed data stream according to each dedicated pilot signal, or estimates the SINR value of the channel according to the common pilot signal.
  • Step S702 The UE acquires a rank value of the channel according to the estimated SINR value of each beamformed data stream or the SINR value of the channel.
  • Step S703 The UE feeds back the obtained rank value of the channel to the base station.
  • the present invention may also be combined with the embodiment, where the UE and the base station simultaneously estimate the rank value, and after the UE feeds back the estimated rank value to the base station, the base station feeds back the UE.
  • the rank value is compared with the rank value calculated by the base station itself, and the final rank value is determined according to a certain criterion. For example, the smallest rank value of the two can be selected as the final rank value.
  • the system structure diagram for estimating the rank value of a channel in a multi-stream beamforming transmission includes a base station 810 and at least one UE 820 served by the base station 810.
  • the UE 820 is configured to estimate the SINR value of each beamformed data stream according to each dedicated pilot signal, or estimate the SINR value of the channel according to the common pilot signal, and shape the SINR value of the data stream or the SINR of the channel according to the estimated individual beam.
  • the value acquires the rank value of the channel, and feeds back the rank value of the acquired channel to the base station.
  • the base station 810 is configured to receive a rank value of a channel taken by the UE 820 fed back by the UE 820.
  • the UE 820 is further configured to feed back the CQI detected by the UE 820 according to the common pilot signal to the base station 810, and send an uplink sounding pilot signal to the base station 810, and may also send other uplink signals to the base station, such as uplink.
  • the data demodulation reference signal or the demodulation reference signal of the uplink control channel can be used as long as the uplink channel information can be estimated.
  • the base station 810 is further configured to acquire a rank value of the channel according to the CQI fed back by the UE 820 and the uplink channel information estimated according to the uplink sounding pilot signal sent by the UE 820, and the rank value of the channel acquired by the base station 810 and the channel fed back by the UE 820.
  • the rank values are compared and the appropriate one is chosen as the rank value of the final channel.
  • the UE 820 includes an SINR value estimation module 821, a channel rank acquisition module 822, and feedback. Module 823.
  • the SINR value estimation module 821 is configured to estimate the SINR value of each beamformed data stream according to each dedicated pilot signal, or estimate the SINR value of the channel according to the common pilot signal.
  • the channel rank obtaining module 822 is configured to obtain a rank value of the channel according to the estimated SINR value of each beamformed data stream or the SINR value of the channel.
  • the feedback module 823 is configured to feed back the rank value of the channel acquired by the channel rank obtaining module 822 to the base station 810.
  • FIG. 9 is a flow chart showing a method for estimating a rank of a channel during downlink data transmission according to Embodiment 4 of the present invention.
  • the method for estimating the rank of the channel during the downlink data transmission includes the following steps: Step S902: The base station receives a channel quality indicator CQI detected by the UE that is fed back by the user equipment UE according to the common pilot;
  • Step S904 The base station estimates the uplink channel information according to the uplink signal sent by the UE.
  • Step S906 The base station acquires the rank of the channel according to the CQI fed back by the UE and the estimated uplink channel information.
  • the uplink signal may include at least one of the following: an uplink data demodulation pilot signal sent by the UE, a demodulation pilot signal of the uplink control channel, and an uplink sounding pilot signal.
  • the obtaining, by the base station, the rank of the channel according to the CQI and the estimated uplink channel information fed back by the UE may include: performing eigenvalue decomposition on the uplink channel information by the base station to obtain a corresponding channel feature value.
  • the base station acquires the rank of the channel according to the channel feature value and the CQI fed back by the UE.
  • the obtaining, by the base station, the rank of the channel according to the CQI and the estimated uplink channel information fed back by the UE may further include: obtaining a signal-to-noise ratio SINR value corresponding to the UE according to the CQI fed back by the UE; if the signal-to-noise ratio SINR value of the UE is less than the first threshold Then, the rank of the channel is determined to be a preset value.
  • the obtaining, by the base station, the rank of the channel according to the channel eigenvalue and the CQI fed back by the UE includes: determining the number of effective subchannels according to the channel eigenvalue ⁇ , and the number of effective subchannels is the rank of the channel.
  • Figure 10 is a block diagram of an apparatus for estimating a rank of a channel during downlink data transmission according to a fourth embodiment of the present invention.
  • the apparatus for estimating the rank of a channel during downlink data transmission according to an embodiment of the present invention includes:
  • the receiving module 1002 is configured to receive, by the user equipment, the user equipment, according to the common pilot detection.
  • Channel quality indicator channel quality indicator
  • the channel information estimation module 1004 is configured to estimate uplink channel information according to an uplink signal sent by the user equipment.
  • the channel rank obtaining module 1006 obtains the rank of the channel according to the channel quality indicator and the estimated uplink channel information fed back by the user equipment.
  • the uplink signal includes at least one of the following: an uplink data demodulation pilot signal sent by the user equipment, a demodulation pilot signal of the uplink control channel, and an uplink sounding pilot signal.
  • the channel rank obtaining module includes: a first acquiring module, configured to perform eigenvalue decomposition on the uplink channel information to obtain a corresponding channel feature value ; ⁇ ; and a second acquiring module, configured to perform channel quality indicator according to the channel feature value and the user equipment feedback Get the rank of the channel.
  • the channel rank obtaining module further includes: a determining module, configured to obtain a signal to noise ratio value corresponding to the user equipment according to the channel quality indicator fed back by the user equipment, and determine a channel if the signal to noise ratio value corresponding to the user equipment is less than the first threshold value
  • the rank is the default value.
  • the judging module can judge the number of effective subchannels according to the channel characteristic value ⁇ , and the number of effective subchannels is the rank of the channel.
  • the invention effectively solves the problem of estimating the rank value, thereby supporting rank adaptive transmission and improving the flexibility of the system.

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Description

信道的秩的估计方法、 系统及装置
技术领域
本发明涉及通信技术领域, 特别涉及一种信道的秩的估计方法、 系统 及装置。 背景技术
在 LTE ( Long Term Evolution, 长期演进) 系统中, 公共导频是小区 公共的, 目前有 4个端口的公共导频信号, 如图 1A和图 1B所示, 分别为 现有技术中 LTE系统中常规 CP ( Cyclic Prefix, 循环前缀) 和扩展 CP的 公共导频映射示意图, 在全带宽上发送。 专用导频是基于 UE ( User Equipment, 用户设备) 的, 即每个用户只能接收到自己的专用导频信号。 在 LTE系统中, 专用导频的端口号是 5 , 如图 2A和图 2B所示, 分别为现 有技术中常规 CP和扩展 CP的专用导频映射示意图, 其中, 表示用户专 属参考符号, 阴影部分表示天线端口 0、 1上公共导频信号。
在 LTE后续演进中, 为了充分发挥智能天线的技术优势, 需要引入多 流波束赋形数据传输。 为了支持多流波束赋形数据传输, 不仅需要设计新 的导频符号图样, 还需要支持 rank值 (信道的秩, 即信道矩阵的特征值的 个数) 自适应技术等其他技术。
现有技术存在的缺点是: 没有针对多流波束赋形传输时进行 rank值估 计的方案, 而现有技术中单流波束赋形传输时 rank值是由终端反馈的, 对 于多流波束赋形传输并不适用。 这主要是因为: rank 自适应指的是根据信 道的秩进行传输数据流数的切换, 如果信道的 rank为 1 , 则传输一个流, 需要的专用导频端口数最少为 1 ; 如果信道的 rank等于 2 , 则传输数据流 数为 2 , 与之相对应的专用导频端口数, 也最少为 2。 因此在 UE处于多流 波束赋形传输模式时, 如何判断 rank值是非常重要的。 并且由于公共端口 导频和专用端口的 rank没有——对应的关系, 因此在多流波束赋形传输时 UE对 rank值的估计会不太准确。 发明内容
本发明的目的旨在至少解决上述技术缺陷之一, 特别是解决目前没有 针对 rank值估计的方案的技术缺陷。
为达到上述目的, 根据本发明的实施例, 提出一种多流波束赋形传输 时信道的秩的估计方法, 包括以下步骤: 基站接收用户设备 UE反馈的 UE 根据公共导频检测的 CQI ( Channel Quality Indicator, 信道质量指示符) ; 基站根据 UE发送的上行探测导频信号估计上行信道信息;基站根据 UE反 馈的 CQI和估计的上行信道信息获取信道的秩。
根据本发明的实施例, 还提出一种多流波束赋形传输时信道的秩的估 计系统, 包括基站和基站服务的至少一个 UE, UE, 用于根据公共导频检 CQI, 并将检测的 CQI反馈给基站, 以及向基站发送上行探测导频信号; 基站, 用于接收 UE反馈的 CQI, 并根据 UE发送的上行探测导频信号估计 上行信道信息, 以及根据 UE反馈的 CQI和估计的上行信道信息获取信道 的秩。
根据本发明的实施例, 还提出一种基站, 包括 CQI接收模块、 上行信 道信息估计模块、 信道秩获取模块, CQI接收模块, 用于接收 UE反馈的 UE根据公共导频检测的 CQI; 上行信道信息估计模块, 用于根据 UE发送 的上行探测导频信号估计上行信道信息; 信道秩获取模块, 用于根据 UE 反馈的 CQI和估计的上行信道信息获取信道的秩。
根据本发明的实施例, 还提出一种多流波束赋形传输时信道的秩的估 计方法, 包括以下步骤: UE根据公共导频估计信道的 SINR值; UE对公 共导频信号进行特征值分解, 获取信道的特征值^ '; UE根据 SINR值和信 道的特征值^ '获取信道的秩; UE将获取的信道的秩反馈给基站。
根据本发明的实施例, 还提出一种多流波束赋形传输时信道的秩的估 计系统, 包括基站和基站服务的至少一个 UE, UE, 用于根据公共导频估 计信道的 SINR值, 并对公共导频信号进行特征值分解, 获取信道的特征 值 ·, 以及根据 SINR值和信道的特征值 ^获取信道的秩, 并将获取的信 道的秩反馈给基站; 基站, 用于接收 UE反馈的 UE取的信道的秩。
根据本发明的实施例, 还提出一种 UE, 包括 SINR值估计模块、 信道 特征值获取模块、 信道秩获取模块和反馈模块, SINR值估计模块, 用于根 据公共导频估计信道的 SINR值; 信道特征值获取模块, 用于对公共导频 信号进行特征值分解, 获取信道的特征值 信道秩获取模块, 用于根据 SINR值估计模块估计的 SINR值和信道特征值获取模块获取的信道的特征 值 ^获取信道的秩; 反馈模块, 用于将信道秩获取模块获取的信道的秩反 馈给基站。
根据本发明的实施例, 还提出一种基站, 包括接收模块、 CQI接收模 块、 上行信道信息估计模块、 信道秩获取模块和比较模块, 接收模块, 用 于接收 UE反馈的 UE获取的信道的秩; CQI接收模块, 用于接收 UE反馈 的 UE根据公共导频检测的 CQI; 上行信道信息估计模块, 用于根据 UE发 送的上行探测导频信号估计上行信道信息; 信道秩获取模块, 用于根据 UE 反馈的 CQI和估计的上行信道信息获取信道的秩; 比较模块, 用于对接收 模块接收的 UE反馈的信道的秩与信道秩获取模块获取的信道的秩进行比 较, 选择两者中合适的作为最终的信道的秩。
根据本发明的实施例, 还提出一种多流波束赋形传输时信道的秩的估 计方法, 包括以下步骤: UE根据各个专用导频信号估计各个波束赋形数据 流的 SINR值, 或根据公共导频信号估计信道的 SINR值; UE根据估计的 各个波束赋形数据流的 SINR值或信道的 SINR值获取信道的秩; UE将获 取的信道的秩反馈给基站。
根据本发明的实施例, 还提出一种多流波束赋形传输时信道的秩的估 计系统, 包括基站和基站服务的至少一个 UE, UE, 用于根据各个专用导 频信号估计各个波束赋形数据流的 SINR值, 或根据公共导频信号估计信 道的 SINR值,并根据估计的各个波束赋形数据流的 SINR值或信道的 SINR 值获取信道的秩, 并将获取的信道的秩反馈给基站; 基站, 用于接收 UE 反馈的 UE取的信道的秩。
根据本发明的实施例, 还提出一种 UE, 包括 SINR值估计模块、 信道 秩获取模块和反馈模块, SINR值估计模块, 用于根据各个专用导频信号估 计各个波束赋形数据流的 SINR值, 或根据公共导频信号估计信道的 SINR 值; 信道秩获取模块, 用于根据估计的各个波束赋形数据流的 SINR值或 信道的 SINR值获取信道的秩; 反馈模块, 用于将信道秩获取模块获取的 信道的秩反馈给基站。
根据本发明的实施例, 还提出一种多流波束赋形传输时信道的秩的估 计方法, 包括以下步骤: 基站接收用户设备 UE反馈的 UE根据公共导频检 测的信道质量指示符 CQI; 基站根据 UE发送的上行数据解调参考信号或 上行控制信道的解调参考信号估计上行信道信息;基站根据 UE反馈的 CQI 和估计的上行信道信息获取信道的秩。
根据本发明的实施例, 还提出一种下行数据传输时信道的秩的估计方 法, 其特征在于, 包括以下步骤: 基站接收用户设备 UE反馈的 UE根据公 共导频检测的信道质量指示符 CQI; 基站根据 UE发送的上行信号估计上 行信道信息; 基站根据 UE反馈的 CQI和估计的上行信道信息获取信道的 秩。
根据本发明的实施例, 还提出一种下行数据传输时信道的秩的估计装 置, 包括: 接收模块, 用于接收用户设备反馈的用户设备根据公共导频检 测的信道质量指示符信道质量指示符; 信道信息估计模块, 用于根据用户 设备发送的上行信号估计上行信道信息; 信道秩获取模块, 根据用户设备 反馈的信道质量指示符和估计的上行信道信息获取信道的秩。
本发明有效地解决了在对 rank值的估计, 从而可在多流波束赋形传输 时以及在下行数据传输时支持 rank自适应传输, 提高了系统的灵活性。
本发明附加的方面和优点将在下面的描述中部分给出, 部分将从下面 的描述中变得明显, 或通过本发明的实践了解到。 附图说明
本发明上述的和 /或附加的方面和优点从下面结合附图对实施例的描 述中将变得明显和容易理解, 其中:
图 1A和图 1B分别为现有技术中 LTE系统中常规 CP和扩展 CP的公 共导频映射示意图;
图 2A和图 2B分别为现有技术中常规 CP和扩展 CP的专用导频映射 示意图; 图 3为本发明实施例一的多流波束赋形传输时信道的 rank值的估计方 法流程图;
图 4为本发明实施例一的多流波束赋形传输时信道的 rank值的估计系 统结构图;
图 5为本发明实施例二的多流波束赋形传输时信道的秩的估计方法流 程图;
图 6为本发明实施例二的多流波束赋形传输时信道的 rank值的估计系 统结构图;
图 7为本发明实施例三的多流波束赋形传输时信道的 rank值的估计方 法流程图;
图 8为本发明实施例三的多流波束赋形传输时信道的 rank值的估计系 统结构图;
图 9为本发明实施例四的下行数据传输时信道的秩的估计方法的流程 图;
图 10 为本发明实施例四的下行数据传输时信道的秩的估计装置的框 图。 具体实施方式
下面详细描述本发明的实施例, 所述实施例的示例在附图中示出, 其 中自始至终相同或类似的标号表示相同或类似的元件或具有相同或类似功 能的元件。 下面通过参考附图描述的实施例是示例性的, 仅用于解释本发 明, 而不能解释为对本发明的限制。
本发明主要在于利用 TDD ( Time Division Duplex, 时分双工) 系统的 上下行信道的对称性, 利用补偿估计信道的 rank值。 在本发明中可以采用 多种方式获得信道的 rank值, 如可以由基站获取, 也可以由 UE获取, 或 者基站和 UE均获取并最终由基站进行选择。 其中, 如何获取信道的 rank 值也是多样的, 在以下实施例中将会详细的描述。 但是需要说明的是, 下 述实施例的目的是使本发明更清楚, 并不是说本发明仅能够通过下述实施 例实现, 从而将本发明限制在下述实施例中, 本领域技术人员应该明白, 根据本发明的思想能够做出各种等同的修改或变化, 这些等同的修改或变 化均应包含在本发明的保护范围之内。
实施例一、
如图 3所示, 为本发明实施例一的多流波束赋形传输时信道的 rank值 的估计方法流程图, 在该实施例中由基站对信道的 rank值进行估计, 包括 以下步骤:
步骤 S301 , UE根据可用的公共导频估计下行带宽的 CQI。 其中, 可 用的公共导频端口数取决于基站发送的公共导频信号,由 UE进行对 PBCH ( Physical Broadcast Channel, 物理广播信道 ) 的信息进行检测获得实际发 送的端口数。 作为本发明的一个实施例, 为了统一调度的目的, UE根据公 共导频估计 CQI的方式是由基站的高层信令通知给 UE的,其中,估计 CQI 的方式既可以基于发送分集方式, 也可以采用其他方法, 或者既可以是基 于宽带的, 也可以是基于子带的。
步骤 S302 , UE将检测的 CQI反馈给基站。作为本发明的一个实施例, 同样为了统一调度的目的, UE反馈的方式也是由基站通知的, 其中可采用 周期的反馈或非周期的反馈。
步骤 S303 , UE向基站发送上行探测导频(sounding )信号, 也可以发 送其他上行信号, 诸如上行数据解调参考信号或上行控制信道的解调参考 信号, 只要能够估计上行信道信息就可以采用, 其处理方式与上行探测导 频信号类似。 作为本发明的一个实施例, 如果终端是单天线端口发送, 可 以采用终端天线切换发送上行探测导频信号获得整个上行信道信息, 如果 终端可以支持多天线端口发送, 则可以采用多天线同时发送多个上行探测 导频信号或者多天线切换发送上行探测导频信号, 其中, 多天线上行探测 导频信号的发送方式可以是 TDM ( Time-Division Multiplexing, 时分复用 ) 方式, 或者码分 CDM ( Code-Division Multiplexing, 码分复用) 方式。
步骤 S304 ,基站根据 UE发送的上行探测导频信号估计上行信道信息。 作为本发明的一个实施例, 可通过以下方式估计上行信道信息, 当然以下 方式仅是估计上行信道信息的一种, 本领域技术人员还可通过其他方式进 行估计, 这些其他方式也应包含在本发明的保护范围之内。
上行探测导频信号是 UE发送一个固定的导频序列在一指定的频带内 传输, 如果在一个频带内只发送了一个上行探测导频信号, 则基站端可以 用接收的信号除以发送的导频序列, 获得信道信息。 具体的:
y = H ^ C + n , H是信道信息, C是发送导频序列, n是信号噪声 从上式可以推出信道信息 = y / C
如果在一个频带内发送了多个上行探测导频信息, 各个上行探测导频 信号需要使用不同的导频序列区分, 此时信道信息的估计需要先将接收信 号除以指定的导频序列, 然后将接收频域信号转换到时域, 根据小区的应 用场景取时域信号前若干个样值, 其他样值填 0 , 再将时域信号转换到频 域去, 最后获得实际的上行信道信息。
步骤 S305 , 基站根据 UE反馈的 CQI和估计的上行信道信息获取信道 的 rank值。
作为本发明的一个实施例, 具体地, 首先利用上下行信道的对称性对 估计出的上行信道信息进行特征值分解获取对应的信道特征值 4 , 之后再 根据所述信道特征值和所述 UE反馈的 CQI获取信道的 rank值。
更为具体地,首先根据 UE反馈的 CQI获得 UE对应的信噪比 SINR值, 如果所述 UE对应的信噪比 SINR值小于第一门限值,则说明该信道不适合 进行多流波束赋形传输, 因此直接判断所述信道的 rank值为预设值, 该预 设值例如为 1或 2等。 其中上述第一门限值根据系统性能预设得到。 之后, 根据信道特征值 ^判断有效子信道的个数, 所述有效子信道的个数为信道 的 rank值。 作为本发明的一个实施例, 提出了一种判断子信道是否有效的 方法, 如可计算特征值比值 其中, > 1 , 如果特征值比值 , 小于 第二门限值, 则认为对应的子信道无效, 从而得到信道的 rank值。 可选择 地, 对于特征值达到相应门限的子信道, 还可依据上述估出的 SINR值和 根据计算出的特征值推导出的实际各个子信道的 SINR , 进行信道容量计 算, 在不同的 rank值下, 信道总容量越大, 则认为该信道容量下对应 rank 值是最优的。 其中, 单个子信道容量的计算方法可用公式 C = 1°g2(1 + lW 进 行计算。 如图 4所示, 为本发明实施例一的多流波束赋形传输时信道的 rank值 的估计系统结构图, 该系统包括基站 410和基站 410服务的至少一个 UE 420 o UE 420用于根据公共导频检测 CQI,并将检测的 CQI反馈给基站 410 , 以及向基站 410发送上行探测导频信号, 其中, 也可以向基站发送其他上 行信号, 诸如上行数据解调参考信号或上行控制信道的解调参考信号, 只 要能够估计上行信道信息就可以采用。 基站 410 用于接收 UE420反馈的 CQI, 并根据 UE 420发送的上行探测导频信号估计上行信道信息, 以及根 据 UE 420反馈的 CQI和估计的上行信道信息获取信道的 rank值。
作为本发明的一个实施例, 基站 410对上行信道信息进行特征值分解 获取对应的信道特征值 ,并根据信道特征值和 UE 420反馈的 CQI获取信 道的 rank值。
其中, 基站 410包括 CQI接收模块 411、 上行信道信息估计模块 412、 信道秩获取模块 413。 CQI接收模块 411用于接收 UE 420反馈的 UE 420 根据公共导频检测的 CQI。上行信道信息估计模块 412用于根据 UE 420发 送的上行探测导频信号估计上行信道信息。 信道秩获取模块 413用于根据 UE 420反馈的 CQI和估计的上行信道信息获取信道的 rank值。
作为本发明的一个实施例, 信道秩获取模块 413 包括信道特征值获取 子模块 414和信道秩获取子模块 415。 信道特征值获取子模块 414用于对 所述上行信道信息进行特征值分解获取对应的信道特征值 ^。 信道秩获取 子模块 415用于根据信道特征值和 UE 420反馈的 CQI获取信道的 rank值。
作为本发明的一个实施例, 信道秩获取模块 413 还包括判断子模块 416 , 用于根据 UE 420反馈的 CQI获得 UE 420对应的信噪比 SINR值, 并 在 UE 420对应的信噪比 SINR值小于第一门限值时,判断信道的 rank值为 1。
作为本发明的一个实施例, 信道秩获取子模块 413根据信道特征值^' 判断有效子信道的个数, 其中有效子信道的个数为所述信道的 rank值。
作为本发明的一个实施例, 基站 410还包括调度模块 417 , 用于统一 调度 UE 420根据公共导频估计 CQI的方式及 UE 420向基站 410反馈 CQI 的方式。 实施例二,
如图 5所示, 为本发明实施例二的多流波束赋形传输时信道的秩的估 计方法流程图, 该实施例与实施例一不同的是由 UE获取信道的 rank值并 反馈给基站, 包括以下步骤:
步骤 S501 , UE根据公共导频估计信道的 SINR值。
步骤 S502, UE对所述公共导频信号进行特征值分解, 获取信道的特 征值 '。
步骤 S503 , UE根据 SINR值和信道的特征值 '获取信道的 rank值。 作为本发明的一个实施例,在该实施例中 UE根据 SINR值和信道的特征值 ^获取信道的 rank值的方式与实施例一所提出的类似, 在此不再赘述。
步骤 S504 , UE将获取的信道的 rank值反馈给基站。
步骤 S505 ,基站可将 UE反馈的 rank值作为最终的 rank值。作为一个 优选实施例, 本发明可将实施例一与实施例二结合, UE和基站同时对 rank 值进行估计, 在 UE向基站反馈其估计的 rank值后, 由基站对 UE反馈的 rank值和基站自己计算的 rank值进行综合比较, 按照某种准则确定最终的 rank值, 例如可以选取两者中最小的 rank值作为最终的 rank值。
同样本发明在该实施例中也提出了对应的系统, 如图 6所示, 为本发 明实施例二的多流波束赋形传输时信道的 rank值的估计系统结构图, 该系 统包括基站 610和基站 610服务的至少一个 UE 620。 UE 620用于根据公共 导频估计信道的 SINR值, 并对公共导频信号进行特征值分解, 获取信道 的特征值 ' , 以及根据 SINR值和信道的特征值 '获取信道的 rank值, 并 将获取的所述信道的 rank值反馈给基站 610。 基站 610用于接收 UE 620 反馈的 UE 620获取的所述信道的 rank值。
其中, UE620还用于向基站 610反馈 UE 620根据公共导频信号检测的 CQI, 并向基站 610发送上行探测导频信号, 其中, 也可以向基站发送其他 上行信号, 诸如上行数据解调参考信号或上行控制信道的解调参考信号, 只要能够估计上行信道信息就可以采用。基站 610还用于根据 UE 620反馈 的 CQI和根据 UE 620发送的上行探测导频信号估计的上行信道信息获取 信道的 rank值, 并将基站 610获取的信道的 rank值与 UE 620反馈的信道 的 rank值进行比较, 选择两者中合适的作为最终的信道的 rank值。
其中, UE620包括 SINR值估计模块 621、 信道特征值获取模块 622、 信道秩获取模块 623和反馈模块 624。 SINR值估计模块 621用于根据公共 导频估计信道的 SINR值。 信道特征值获取模块 622用于对公共导频信号 进行特征值分解,获取信道的特征值 ^。信道秩获取模块 623用于根据 SINR 值估计模块 621估计的 SINR值和信道特征值获取模块 622获取的信道的 特征值 '获取信道的 rank值。 反馈模块 624用于将信道秩获取模块 623获 取的所述信道的 rank值反馈给基站。
作为本发明的一个实施例, 信道秩获取模块 623 包括信道特征值获取 子模块 625和信道秩获取子模块 626。 信道特征值获取子模块 625用于对 上行信道信息进行特征值分解获取对应的信道特征值 ^。信道秩获取子模 块, 用于根据所述信道特征值 ^获取信道的 rank值。 具体地, 信道秩获取 子模块根据信道特征值 判断有效子信道的个数, 有效子信道的个数为信 道的 rank值。
作为本发明的一个实施例, 信道秩获取模块 623 还包括判断子模块
627 , 用于根据 UE620反馈的 CQI获得 UE620对应的信噪比 SINR值, 并 在 UE620对应的信噪比 SINR值小于第一门限值时, 判断信道的 rank值为 1。
其中, 基站 610包括接收模块 611、 CQI接收模块 612、 上行信道信息 估计模块 613、 信道秩获取模块 614和比较模块 615。 接收模块 611用于接 收 UE 620反馈的 UE 620获取的信道的 rank值。 CQI接收模块 612用于接 收 UE 620反馈的 UE 620根据公共导频检测的 CQI。 上行信道信息估计模 块 613用于根据 UE 620发送的上行探测导频信号估计上行信道信息。信道 秩获取模块 614用于根据 UE620反馈的 CQI和估计的上行信道信息获取信 道的 rank值。 比较模块 615用于对接收模块 611接收的 UE 620反馈的信 道的 rank值与信道秩获取模块 614获取的信道的 rank值进行比较,选择两 者中合适的作为最终的信道的 rank值。 实施例三, 如图 7所示, 为本发明实施例三的多流波束赋形传输时信道的 rank值 的估计方法流程图, 该实施例与实施例二基本类似, 不同的是 UE估计信 道的 rank值的方法不同, 包括以下步骤:
步骤 S701 , UE 根据各个专用导频信号估计各个波束赋形数据流的 SINR值, 或根据公共导频信号估计信道的 SINR值。
步骤 S702 , UE根据估计的各个波束赋形数据流的 SINR值或信道的 SINR值获取信道的 rank值。
步骤 S703 , UE将获取的所述信道的 rank值反馈给基站。
同样, 作为一个优选实施例, 本发明也可将实施例一与本实施例结合, UE和基站同时对 rank值进行估计,在 UE向基站反馈其估计的 rank值后, 由基站对 UE反馈的 rank值和基站自己计算的 rank值进行综合比较, 按照 某种准则确定最终的 rank值,例如可以选取两者中最小的 rank值作为最终 的 rank值。
如图 8所示, 为本发明实施例三的多流波束赋形传输时信道的 rank值 的估计系统结构图, 包括基站 810和基站 810服务的至少一个 UE 820。 UE 820用于根据各个专用导频信号估计各个波束赋形数据流的 SINR值,或根 据公共导频信号估计信道的 SINR值, 并根据估计的各个波束赋形数据流 的 SINR值或信道的 SINR值获取信道的 rank值, 并将获取的信道的 rank 值反馈给基站。 基站 810用于接收 UE 820反馈的 UE 820取的信道的 rank 值。
作为本发明的一个实施例, UE 820还用于向基站 810反馈 UE 820根 据公共导频信号检测的 CQI, 并向基站 810发送上行探测导频信号, 也可 以向基站发送其他上行信号, 诸如上行数据解调参考信号或上行控制信道 的解调参考信号, 只要能够估计上行信道信息就可以采用。 基站 810还用 于根据 UE 820反馈的 CQI和根据 UE 820发送的上行探测导频信号估计的 上行信道信息获取信道的 rank值, 并将基站 810获取的信道的 rank值与 UE 820反馈的信道的 rank值进行比较,选择两者中合适的作为最终的信道 的 rank值。
其中, UE820包括 SINR值估计模块 821、信道秩获取模块 822和反馈 模块 823。 SINR值估计模块 821用于根据各个专用导频信号估计各个波束 赋形数据流的 SINR值, 或根据公共导频信号估计信道的 SINR值。 信道秩 获取模块 822 用于根据估计的各个波束赋形数据流的 SINR 值或信道的 SINR值获取信道的 rank值。 反馈模块 823用于将信道秩获取模块 822获 取的信道的 rank值反馈给基站 810。
实施例四
图 9为本发明实施例四的下行数据传输时信道的秩的估计方法的流程 图。 如图 9所示, 该下行数据传输时信道的秩的估计方法包括以下步骤: 步骤 S902 , 基站接收用户设备 UE反馈的 UE根据公共导频检测的信 道质量指示符 CQI;
步骤 S904 , 基站根据 UE发送的上行信号估计上行信道信息; 步骤 S906 , 基站根据 UE反馈的 CQI和估计的上行信道信息获取信道 的秩。
其中, 该上行信号可以包括以下至少之一: UE发送的上行数据解调导 频信号、 上行控制信道的解调导频信号、 以及上行探测导频信号。
基站根据 UE反馈的 CQI和估计的上行信道信息获取信道的秩可以包 括: 基站对上行信道信息进行特征值分解获取对应的信道特征值 基站 根据信道特征值和 UE反馈的 CQI获取信道的秩。
基站根据 UE反馈的 CQI和估计的上行信道信息获取信道的秩还可以 包括: 根据 UE反馈的 CQI获得 UE对应的信噪比 SINR值; 如果 UE对应 的信噪比 SINR值小于第一门限值, 则判断信道的秩为预设值。
基站根据信道特征值和 UE反馈的 CQI获取信道的秩包括: 根据信道 特征值 ^判断有效子信道的个数, 有效子信道的个数为信道的秩。
在具体实现时, 具体的处理步骤与本发明的多个实施例所公开的处理 步骤类似。
图 10 为本发明实施例四的下行数据传输时信道的秩的估计装置的框 图。 如图 10所示, 根据本发明实施例的下行数据传输时信道的秩的估计装 置包括:
接收模块 1002 , 用于接收用户设备反馈的用户设备根据公共导频检测 的信道质量指示符信道质量指示符;
信道信息估计模块 1004 , 用于根据用户设备发送的上行信号估计上行 信道信息;
信道秩获取模块 1006, 根据用户设备反馈的信道质量指示符和估计的 上行信道信息获取信道的秩。
其中, 上行信号包括以下至少之一: 用户设备发送的上行数据解调导 频信号、 上行控制信道的解调导频信号、 以及上行探测导频信号。
信道秩获取模块包括: 第一获取模块, 用于对上行信道信息进行特征 值分解获取对应的信道特征值 Α· ; 第二获取模块, 用于根据信道特征值和 用户设备反馈的信道质量指示符获取信道的秩。
信道秩获取模块还包括: 判断模块, 用于根据用户设备反馈的信道质 量指示符获得用户设备对应的信噪比值, 如果用户设备对应的信噪比值小 于第一门限值, 则判断信道的秩为预设值。
判断模块可以根据信道特征值 ^判断有效子信道的个数, 有效子信道 的个数为信道的秩。
本发明有效地解决了对 rank值的估计的问题,从而可支持 rank自适应 传输, 提高了系统的灵活性。
尽管已经示出和描述了本发明的实施例, 对于本领域的普通技术人员 而言, 可以理解在不脱离本发明的原理和精神的情况下可以对这些实施例 进行多种变化、 修改、 替换和变型, 本发明的范围由所附权利要求及其等 同限定。

Claims

权利要求书
1、 一种多流波束赋形传输时信道的秩的估计方法, 其特征在于, 包括 以下步骤:
基站接收用户设备反馈的所述用户设备根据公共导频检测的信道质量 指示符;
所述基站根据所述用户设备发送的上行探测导频信号估计上行信道信 息;
所述基站根据所述用户设备反馈的信道质量指示符和估计的所述上行 信道信息获取信道的秩。
2、 如权利要求 1所述的多流波束赋形传输时信道的秩的估计方法, 其 特征在于, 所述基站根据所述用户设备反馈的信道质量指示符和估计的所 述上行信道信息获取信道的秩包括:
所述基站对所述上行信道信息进行特征值分解获取对应的信道特征值 ;
所述基站根据所述信道特征值和所述用户设备反馈的信道质量指示符 获取信道的秩。
3、 如权利要求 2所述的多流波束赋形传输时信道的秩的估计方法, 其 特征在于, 还包括:
根据用户设备反馈的信道质量指示符获得所述用户设备对应的信噪比 值;
如果所述用户设备对应的信噪比值小于第一门限值, 则判断所述信道 的秩为预设值。
4、如权利要求 2或 3所述的多流波束赋形传输时信道的秩的估计方法, 其特征在于, 所述基站根据所述信道特征值和所述用户设备反馈的信道质 量指示符获取信道的秩包括:
根据信道特征值 判断有效子信道的个数, 所述有效子信道的个数为 所述信道的秩。
5、 如权利要求 4所述的多流波束赋形传输时信道的秩的估计方法, 其 特征在于, 所述根据信道特征值 '·判断有效子信道的个数包括:
计算特征值比值 / , 其中, / > 1;
如果所述特征值比值 / 4小于第二门限值, 则认为对应的子信道无 效。
6、 如权利要求 4所述的多流波束赋形传输时信道的秩的估计方法, 其 特征在于, 在根据信道特征值 '·判断有效子信道的个数之后, 还包括: 根据有效子信道对应的信道特征值获取实际各个子信道的信噪比值; 根据实际各个子信道的信噪比值和所述用户设备对应的信噪比值计算 信道容量, 信道总容量最大时对应的信道的秩最优值。
7、 如权利要求 1所述的多流波束赋形传输时信道的秩的估计方法, 其 特征在于, 还包括:
所述用户设备根据公共导频估计信道质量指示符的方式及所述用户设 备向所述基站反馈信道质量指示符的方式由所述基站统一调度。
8、 如权利要求 1所述的多流波束赋形传输时信道的秩的估计方法, 其 特征在于, 还包括:
所述用户设备向所述基站发送上行探测导频信号包括:
如果所述用户设备是单天线端口发送, 则所述用户设备釆用天线切换 发送所述上行探测导频信号;
如果所述用户设备是多天线端口发送, 则所述用户设备釆用多个天线 同时发送多个上行探测导频信号, 或多个天线切换发送所述上行探测导频 信号。
9、 一种多流波束赋形传输时信道的秩的估计系统, 其特征在于, 包括 基站和所述基站服务的至少一个用户设备,
所述用户设备, 用于根据公共导频检测信道质量指示符, 并将检测的 信道质量指示符反馈给所述基站, 以及向所述基站发送上行探测导频信号; 所述基站, 用于接收用户设备反馈的所述信道质量指示符, 并根据所 述用户设备发送的上行探测导频信号估计上行信道信息, 以及根据所述用 户设备反馈的信道质量指示符和估计的所述上行信道信息获取信道的秩。
10、 如权利要求 9所述的多流波束赋形传输时信道的秩的估计系统, 其特征在于, 所述基站对所述上行信道信息进行特征值分解获取对应的信 道特征值 ^ , 并根据所述信道特征值和所述用户设备反馈的信道质量指示 符获取信道的秩。
11、 一种基站, 其特征在于, 包括信道质量指示符接收模块、 上行信 道信息估计模块、 信道秩获取模块,
所述信道质量指示符接收模块, 用于接收用户设备反馈的所述用户设 备根据公共导频检测的信道质量指示符;
所述上行信道信息估计模块, 用于根据所述用户设备发送的上行探测 导频信号估计上行信道信息;
所述信道秩获取模块, 用于根据所述用户设备反馈的信道质量指示符 和估计的所述上行信道信息获取信道的秩。
12、 如权利要求 11所述的基站, 其特征在于, 所述信道秩获取模块包 括信道特征值获取子模块和信道秩获取子模块,
所述信道特征值获取子模块, 用于对所述上行信道信息进行特征值分 解获取对应的信道特征值 4;
所述信道秩获取子模块, 用于根据所述信道特征值和所述用户设备反 馈的信道质量指示符获取信道的秩。
13、 如权利要求 12所述的基站, 其特征在于, 所述信道秩获取模块还 包括判断子模块, 用于根据用户设备反馈的信道质量指示符获得所述用户 设备对应的信噪比值, 并在所述用户设备对应的信噪比值小于第一门限值 时, 判断所述信道的秩为预设值。
14、 如权利要求 12或 13所述的基站, 其特征在于, 所述信道秩获取 子模块根据信道特征值 判断有效子信道的个数, 所述有效子信道的个数 为所述信道的秩。
15、 如权利要求 14所述的基站, 其特征在于, 还包括调度模块, 用于 统一调度所述用户设备根据公共导频估计信道质量指示符的方式及所述用 户设备向所述基站反馈信道质量指示符的方式。
16、 一种多流波束赋形传输时信道的秩的估计方法, 其特征在于, 包 括以下步骤:
用户设备根据公共导频估计信道的信噪比值;
所述用户设备对所述公共导频信号进行特征值分解, 获取信道的特征 值 '· ;
所述用户设备根据所述信噪比值和所述信道的特征值 '·获取信道的 秩;
所述用户设备将获取的所述信道的秩反馈给所述基站。
17、 如权利要求 16所述的多流波束赋形传输时信道的秩的估计方法, 其特征在于, 还包括:
判断获取的所述信噪比值是否小于第一门限值, 如果所述信噪比值 d、 于第一门限值, 则判断所述信道的秩为预设值。
18、 如权利要求 17所述的多流波束赋形传输时信道的秩的估计方法, 其特征在于, 所述用户设备根据所述信噪比值和所述信道的特征值 '·获取 信道的秩包括:
所述用户设备根据信道特征值 判断有效子信道的个数, 所述有效子 信道的个数为所述信道的秩。
19、 如权利要求 18所述的多流波束赋形传输时信道的秩的估计方法, 其特征在于,所述用户设备根据信道特征值 '·判断有效子信道的个数包括: 所述用户设备计算特征值比值 其中, > 1;
如果所述特征值比值 / 4小于第二门限值, 则认为对应的子信道无 效。
20、 如权利要求 19所述的多流波束赋形传输时信道的秩的估计方法, 其特征在于, 在根据信道特征值 '·判断有效子信道的个数之后, 还包括: 所述用户设备根据有效子信道对应的信道特征值获取实际各个子信道 的信噪比值;
所述用户设备根据实际各个子信道的信噪比值和所述用户设备对应的 信噪比值计算信道容量, 信道总容量最大时对应的信道的秩最优值。
21、 如权利要求 16-20任一项所述的多流波束赋形传输时信道的秩的 估计方法, 其特征在于, 在所述用户设备将获取的所述信道的秩反馈给所 述基站之后, 还包括:
所述基站根据所述用户设备反馈的信道质量指示符和根据所述用户设 备发送的上行探测导频信号估计的上行信道信息获取信道的秩;
所述基站将所述基站获取的信道的秩与所述用户设备反馈的信道的秩 进行比较, 选择两者中合适的作为最终的信道的秩。
22、 一种多流波束赋形传输时信道的秩的估计系统, 其特征在于, 包 括基站和所述基站服务的至少一个用户设备,
所述用户设备, 用于根据公共导频估计信道的信噪比值, 并对所述公 共导频信号进行特征值分解, 获取信道的特征值 '· , 以及根据所述信噪比 值和所述信道的特征值 获取信道的秩, 并将获取的所述信道的秩反馈给 所述基站;
所述基站, 用于接收所述用户设备反馈的所述用户设备取的所述信道 的秩。
23、 如权利要求 22所述的多流波束赋形传输时信道的秩的估计系统, 其特征在于,
所述用户设备, 还用于向所述基站反馈所述用户设备根据公共导频信 号检测的信道质量指示符, 并向所述基站发送上行探测导频信号;
所述基站, 还用于根据所述用户设备反馈的信道质量指示符和根据所 述用户设备发送的上行探测导频信号估计的上行信道信息获取信道的秩, 并将所述基站获取的信道的秩与所述用户设备反馈的信道的秩进行比较, 选择两者中合适的作为最终的信道的秩。
24、 一种用户设备, 其特征在于, 包括信噪比值估计模块、 信道特征 值获取模块、 信道秩获取模块和反馈模块,
所述信噪比值估计模块, 用于根据公共导频估计信道的信噪比值; 所述信道特征值获取模块,用于对所述公共导频信号进行特征值分解, 获取信道的特征值
所述信道秩获取模块, 用于根据所述信噪比值估计模块估计的信噪比 值和所述信道特征值获取模块获取的信道的特征值 '·获取信道的秩;
所述反馈模块, 用于将所述信道秩获取模块获取的所述信道的秩反馈 给基站。
25、 如权利要求 24所述的用户设备, 其特征在于, 所述信道秩获取模 块包括信道特征值获取子模块和信道秩获取子模块,
所述信道特征值获取子模块, 用于对所述上行信道信息进行特征值分 解获取对应的信道特征值 4;
所述信道秩获取子模块, 用于根据所述信道特征值获取信道的秩。
26、 如权利要求 25所述的用户设备, 其特征在于, 所述信道秩获取模 块还包括判断子模块, 用于根据用户设备反馈的信道质量指示符获得所述 用户设备对应的信噪比值, 并在所述用户设备对应的信噪比值小于第一门 限值时, 判断所述信道的秩为预设值。
27、 如权利要求 25所述的用户设备, 其特征在于, 所述信道秩获取子 模块根据信道特征值 判断有效子信道的个数, 所述有效子信道的个数为 所述信道的秩。
28、 一种基站, 其特征在于, 包括接收模块、 信道质量指示符接收模 块、 上行信道信息估计模块、 信道秩获取模块和比较模块,
所述接收模块, 用于接收所述用户设备反馈的所述用户设备获取的所 述信道的秩;
所述信道质量指示符接收模块, 用于接收用户设备反馈的所述用户设 备根据公共导频检测的信道质量指示符;
所述上行信道信息估计模块, 用于根据所述用户设备发送的上行探测 导频信号估计上行信道信息;
所述信道秩获取模块, 用于根据所述用户设备反馈的信道质量指示符 和估计的所述上行信道信息获取信道的秩;
所述比较模块, 用于对所述接收模块接收的用户设备反馈的信道的秩 与所述信道秩获取模块获取的信道的秩进行比较, 选择两者中合适的作为 最终的信道的秩。
29、 一种多流波束赋形传输时信道的秩的估计方法, 其特征在于, 包 括以下步骤:
用户设备根据各个专用导频信号估计各个波束赋形数据流的信噪比 值, 或根据公共导频信号估计信道的信噪比值;
所述用户设备根据估计的各个波束赋形数据流的信噪比值或信道的信 噪比值获取信道的秩;
所述用户设备将获取的所述信道的秩反馈给所述基站。
30、 如权利要求 29所述的多流波束赋形传输时信道的秩的估计方法, 其特征在于,在所述用户设备将获取的所述信道的秩反馈给所述基站之后, 还包括:
所述基站根据所述用户设备反馈的信道质量指示符和根据所述用户设 备发送的上行探测导频信号估计的上行信道信息获取信道的秩;
所述基站将所述基站获取的信道的秩与所述用户设备反馈的信道的秩 进行比较, 选择两者中合适的作为最终的信道的秩。
31、 一种多流波束赋形传输时信道的秩的估计系统, 其特征在于, 包 括基站和所述基站服务的至少一个用户设备,
所述用户设备, 用于根据各个专用导频信号估计各个波束赋形数据流 的信噪比值, 或根据公共导频信号估计信道的信噪比值, 并根据估计的各 个波束赋形数据流的信噪比值或信道的信噪比值获取信道的秩, 并将获取 的所述信道的秩反馈给所述基站;
所述基站, 用于接收所述用户设备反馈的所述用户设备取的所述信道 的秩。
32、 如权利要求 31所述的多流波束赋形传输时信道的秩的估计系统, 其特征在于,
所述用户设备, 还用于向所述基站反馈所述用户设备根据公共导频信 号检测的信道质量指示符, 并向所述基站发送上行探测导频信号;
所述基站, 还用于根据所述用户设备反馈的信道质量指示符和根据所 述用户设备发送的上行探测导频信号估计的上行信道信息获取信道的秩, 并将所述基站获取的信道的秩与所述用户设备反馈的信道的秩进行比较, 选择两者中合适的作为最终的信道的秩。
33、 一种用户设备, 其特征在于, 包括信噪比值估计模块、 信道秩获 取模块和反馈模块, 所述信噪比值估计模块, 用于根据各个专用导频信号估计各个波束赋 形数据流的信噪比值, 或根据公共导频信号估计信道的信噪比值;
所述信道秩获取模块, 用于根据估计的各个波束赋形数据流的信噪比 值或信道的信噪比值获取信道的秩;
所述反馈模块, 用于将所述信道秩获取模块获取的所述信道的秩反馈 给所述基站。
34、 一种多流波束赋形传输时信道的秩的估计方法, 其特征在于, 包 括以下步骤:
基站接收用户设备反馈的所述用户设备根据公共导频检测的信道质量 指示符信道质量指示符;
所述基站根据所述用户设备发送的上行数据解调参考信号或上行控制 信道的解调参考信号估计上行信道信息;
所述基站根据所述用户设备反馈的信道质量指示符和估计的所述上行 信道信息获取信道的秩。
35、 如权利要求 34所述的多流波束赋形传输时信道的秩的估计方法, 其特征在于, 所述基站根据所述用户设备反馈的信道质量指示符和估计的 所述上行信道信息获取信道的秩包括:
所述基站对所述上行信道信息进行特征值分解获取对应的信道特征值 ;
所述基站根据所述信道特征值和所述用户设备反馈的信道质量指示符 获取信道的秩。
36、 如权利要求 35所述的多流波束赋形传输时信道的秩的估计方法, 其特征在于, 还包括:
根据用户设备反馈的信道质量指示符获得所述用户设备对应的信噪比 值;
如果所述用户设备对应的信噪比值小于第一门限值, 则判断所述信道 的秩为预设值。
37、 如权利要求 35或 36所述的多流波束赋形传输时信道的秩的估计 方法, 其特征在于, 所述基站根据所述信道特征值和所述用户设备反馈的 信道质量指示符获取信道的秩包括:
根据信道特征值 判断有效子信道的个数, 所述有效子信道的个数为 所述信道的秩。
38、 一种下行数据传输时信道的秩的估计方法, 其特征在于, 包括以 下步骤:
基站接收用户设备反馈的所述用户设备根据公共导频检测的信道质量 指示符信道质量指示符;
所述基站根据所述用户设备发送的上行信号估计上行信道信息; 所述基站根据所述用户设备反馈的信道质量指示符和估计的所述上行 信道信息获取信道的秩。
39、 如权利要求 38所述的秩的估计方法, 其特征在于, 所述上行信号 包括以下至少之一: 用户设备发送的上行数据解调导频信号、 上行控制信 道的解调导频信号、 以及上行探测导频信号。
40、 如权利要求 39所述的秩的估计方法, 其特征在于, 所述基站根据 所述用户设备反馈的信道质量指示符和估计的所述上行信道信息获取信道 的秩包括:
所述基站对所述上行信道信息进行特征值分解获取对应的信道特征值 ;
所述基站根据所述信道特征值和所述用户设备反馈的信道质量指示符 获取信道的秩。
41、 如权利要求 40所述的秩的估计方法, 其特征在于, 还包括: 根据用户设备反馈的信道质量指示符获得所述用户设备对应的信噪比 值;
如果所述用户设备对应的信噪比值小于第一门限值, 则判断所述信道 的秩为预设值。
42、 如权利要求 40或 41所述的秩的估计方法, 其特征在于, 所述基 站根据所述信道特征值和所述用户设备反馈的信道质量指示符获取信道的 秩包括:
根据信道特征值 判断有效子信道的个数, 所述有效子信道的个数为 所述信道的秩。
43、 一种下行数据传输时信道的秩的估计装置, 其特征在于, 包括: 接收模块, 用于接收用户设备反馈的所述用户设备根据公共导频检测 的信道质量指示符信道质量指示符;
信道信息估计模块, 用于根据所述用户设备发送的上行信号估计上行 信道信息;
信道秩获取模块, 根据所述用户设备反馈的信道质量指示符和估计的 所述上行信道信息获取信道的秩。
44、 如权利要求 43所述的秩的估计装置, 其特征在于, 所述上行信号 包括以下至少之一: 用户设备发送的上行数据解调导频信号、 上行控制信 道的解调导频信号、 以及上行探测导频信号。
45、 如权利要求 44所述的秩的估计装置, 其特征在于, 所述信道秩获 取模块包括:
第一获取模块, 用于对所述上行信道信息进行特征值分解获取对应的 信道特征值 4 ;
第二获取模块, 用于根据所述信道特征值和所述用户设备反馈的信道 质量指示符获取信道的秩。
46、 如权利要求 45所述的秩的估计装置, 其特征在于, 还包括: 判断模块, 用于根据用户设备反馈的信道质量指示符获得所述用户设 备对应的信噪比值, 如果所述用户设备对应的信噪比值小于第一门限值, 贝 'J判断所述信道的秩为预设值。
47、 如权利要求 46所述的秩的估计装置, 其特征在于, 所述判断模块 根据信道特征值 判断有效子信道的个数, 所述有效子信道的个数为所述 信道的秩。
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CN101189823A (zh) * 2005-06-01 2008-05-28 高通股份有限公司 用于列表球解码及ml mimo接收机的cqi和秩预测
CN101174924A (zh) * 2006-11-01 2008-05-07 大唐移动通信设备有限公司 一种测量空间信道秩的方法及系统

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