WO2014114095A1 - 一种上行干扰抑制的方法及设备 - Google Patents

一种上行干扰抑制的方法及设备 Download PDF

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Publication number
WO2014114095A1
WO2014114095A1 PCT/CN2013/083445 CN2013083445W WO2014114095A1 WO 2014114095 A1 WO2014114095 A1 WO 2014114095A1 CN 2013083445 W CN2013083445 W CN 2013083445W WO 2014114095 A1 WO2014114095 A1 WO 2014114095A1
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Prior art keywords
signal
signal transmission
precoding vector
power
objective function
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PCT/CN2013/083445
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English (en)
French (fr)
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余荣道
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华为技术有限公司
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Priority to EP13872913.2A priority Critical patent/EP2942997B1/en
Publication of WO2014114095A1 publication Critical patent/WO2014114095A1/zh
Priority to US14/810,141 priority patent/US9906283B2/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • H04B7/046—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting taking physical layer constraints into account
    • H04B7/0465—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting taking physical layer constraints into account taking power constraints at power amplifier or emission constraints, e.g. constant modulus, into account
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • H04W52/36—TPC using constraints in the total amount of available transmission power with a discrete range or set of values, e.g. step size, ramping or offsets
    • H04W52/367—Power values between minimum and maximum limits, e.g. dynamic range
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/309—Measuring or estimating channel quality parameters
    • H04B17/345—Interference values
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
    • H04J11/0023—Interference mitigation or co-ordination
    • H04J11/0026—Interference mitigation or co-ordination of multi-user interference
    • H04J11/003—Interference mitigation or co-ordination of multi-user interference at the transmitter
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/14—Spectrum sharing arrangements between different networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/20—Monitoring; Testing of receivers
    • H04B17/26—Monitoring; Testing of receivers using historical data, averaging values or statistics
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/06—TPC algorithms
    • H04W52/14—Separate analysis of uplink or downlink
    • H04W52/146—Uplink power control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
    • H04W52/243—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account interferences
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/14—Direct-mode setup

Definitions

  • the present invention relates to the field of communications, and in particular, to a method and an apparatus for uplink interference suppression. Background technique
  • the existing 3G, 4G cellular mobile communication system is a typical infrastructure network, and multiple low power transmitters are used instead of one high power transmitter.
  • the small coverage corresponding to each small transmitter is called a cell, and each cell allocates a set of channels, corresponding to using a set of radio resources, and the neighboring cells use different radio resources, so that no interference is formed between them.
  • Cells that are far apart can reuse the same radio resources, which results in spatial multiplexing of radio channel resources, thereby greatly increasing system capacity.
  • D2D (Device - to _ device) communication does not require the control of a base station or an access node, and communication or networking is very flexible.
  • the introduction of terminal self-organizing communication between terminals of a cellular mobile communication system will bring a series of benefits.
  • a direct advantage is that local services that are close at hand can be directly relayed between terminals without going through the base station.
  • the object of the embodiments of the present invention is to provide a method and a device for uplink interference suppression, which are to solve the problem of how to effectively control and manage the interference between D2D and cellular communication under the condition that the D2D communication multiplexes the spectrum resources of the cellular communication. .
  • a method for uplink interference suppression includes: establishing an objective function according to a useful signal power transmitted by a user equipment UE, and transmitting, by the UE, a cellular uplink interference power and a noise power, where the objective function is used to solve a precoding vector of the UE signal transmission; a precoding vector for transmitting a signal of the UE signal in the objective function under a constraint condition that the precoding vector of the UE signal transmission is a unitary matrix;
  • the precoding vector processes the signal transmitted by the UE such that the signal transmitted by the UE has minimal interference to the cellular uplink.
  • the establishing a target function according to the useful signal power transmitted by the user equipment UE, the UE transmission to the cellular uplink interference power, and the noise power includes: An objective function is established, the objective function being a ratio of the user signal power transmitted by the UE divided by the sum of the cellular uplink interference power and the noise power of the UE transmission.
  • the coding vector is taken as the feature vector corresponding to the largest eigenvalue of the A.
  • a second aspect a method for uplink interference suppression, the method includes: establishing an objective function according to a mean square error of a received signal of a UE, where the objective function is used to solve a precoding vector of the signal transmission of the UE; Solving the objective function in a constraint condition that the uplink interference power is less than a preset first threshold value and the total signal power of the UE is less than a preset second threshold value
  • the signal transmitted by the UE has the least interference to the cellular uplink.
  • the uplink interference power of the UE is less than a preset first threshold, and a total signal power of the UE is less than a preset.
  • the method includes: the first constraint is that the uplink interference power of the UE is less than a preset first threshold Solving a precoding vector W1 of the first optimal UE signal transmission according to the target function; and when the second constraint condition is that the total signal power of the UE is less than a preset second threshold, according to the target
  • a user equipment the device includes: a first establishing unit, configured to establish an objective function according to a useful signal power transmitted by the user equipment UE, and the UE transmits an uplink uplink interference power and a noise power, where the target a function for solving a precoding vector of the UE signal transmission; a first solving unit, configured to solve a UE signal transmission in the target function under a constraint condition that the precoding vector of the UE signal transmission is a unitary matrix Precoding vector And a first processing unit, configured to process, according to the precoding vector of the UE signal transmission, the signal transmitted by the UE, so that the signal transmitted by the UE has the least interference to the cellular uplink.
  • the first establishing unit is specifically configured to: establish an objective function, where the target function is a user signal power transmitted by the UE divided by the UE transmission The ratio of the sum of cellular uplink interference power and noise power.
  • a user equipment includes: a second establishing unit, configured to establish an objective function according to a mean square error of a received signal of the UE, where the target function is used to solve a precoding vector of the signal transmission of the UE; a second solving unit, configured to solve the problem that the uplink interference power of the UE is less than a preset first threshold value and a total signal power of the UE is less than a preset second threshold value a precoding vector of the UE signal transmission in the objective function; a second processing unit, configured to process the signal transmitted by the UE according to the precoding vector of the UE signal transmission, so that the signal transmitted by the UE has the least interference to the cellular uplink.
  • the embodiment of the present invention provides a method for uplink interference suppression, where the method is to establish an objective function, where the objective function is the useful signal power of the user equipment UE divided by the uplink interference power of the UE.
  • the ratio of the sum of the noise powers, in the constraint condition for the user equipment When the precoding vector of the signal transmission is a unitary matrix, the precoding vector of the signal transmission of the UE is solved according to the objective function, so that the greater the useful signal power of the UE, the better the interference of the D2D signal transmission to the cellular uplink is smaller.
  • the objective function is a mean square error of the received signal of the UE
  • the constraint is that the uplink interference power of the UE is less than a preset first threshold value and a total signal transmitted by the UE.
  • the precoding vector of the UE signal transmission is solved according to the target function, so that the interference of the UE to the cellular uplink is within the first threshold, the UE
  • the reliability of signal transmission is the best, so that the D2D communication multiplexes the spectrum resources of the cellular communication, the design of the precoding vector transmitted by the UE signal can suppress the interference between the D2D transmission link and the cellular uplink transmission link. This greatly increases the spectral efficiency and capacity of the system.
  • FIG. 1 is a schematic diagram of an application scenario of an uplink interference suppression method according to an embodiment of the present invention
  • FIG. 2 is a schematic diagram of an application scenario of an uplink interference suppression method according to an embodiment of the present invention
  • FIG. 4 is a flowchart of a method for improving uplink interference suppression according to an embodiment of the present invention
  • FIG. 5 is a flowchart of a method for uplink interference suppression according to Embodiment 3 of the present invention
  • FIG. 6 is a structural diagram of a device of a user equipment according to Embodiment 4 of the present invention
  • FIG. 1 is a schematic diagram of an application scenario of an uplink interference suppression method according to an embodiment of the present invention
  • FIG. 2 is a schematic diagram of an application scenario of an uplink interference suppression method according to an embodiment of the present invention
  • FIG. 4 is a flowchart of a method for improving uplink interference suppression according to an embodiment of the present invention
  • FIG. 5 is a flowchart of a method for uplink interference suppression according
  • FIG. 7 is a structural diagram of a device of a first solution unit in a user equipment according to Embodiment 4 of the present invention.
  • FIG. 8 is a structural diagram of a device of a user equipment according to Embodiment 5 of the present invention.
  • 9 is a device structure of a second solution unit in a user equipment according to Embodiment 5 of the present invention.
  • 10 is a device structure diagram of a user equipment according to Embodiment 6 of the present invention.
  • FIG. 1 is a schematic diagram of an application scenario of an uplink interference suppression method according to an embodiment of the present invention.
  • a cellular uplink user equipment (User Equipment, UE) communicates with a base station (Base Station, BS), and a transmitting end user equipment and a receiving end user equipment perform Device to Device (D2D) transmission, and D2D transmission multiplexing.
  • Cellular uplink spectrum resources The precoding vector transmitted by the transmitting end user equipment adopts two precoding methods of the present invention, which can effectively suppress the interference of the D2D transmission to the cellular transmission and improve the total capacity of the system.
  • the two precoding methods are respectively that the larger the useful signal power is, the better the D2D transmission is to the cellular uplink when the D2D transmission is smaller, and the objective function is established and the user equipment of the transmitting end is solved.
  • FIG. 2 is a schematic diagram of an application scenario of another uplink interference suppression method according to an embodiment of the present invention.
  • the cellular uplink UE1 communicates with the BS 1, and the cellular uplink UE2 communicates with the BS2, and the UE2 and the UE1 transmit on the same frequency resource, and the precoding vector transmitted by the UE1 or the UE2 is adopted.
  • the two precoding methods of the present invention can effectively suppress interference of signal transmission between cells and increase the total capacity of the system.
  • the two precoding methods are respectively that the better the useful signal power is when UE1 or UE2 transmits, and the smaller the interference of UE1 or UE2 to another cell is, the better the target function is solved and the UE1 or UE2 is solved.
  • a precoding vector for signal transmission or when the UE1 or UE2 transmits interference suppression to another cell within a certain threshold range, when the total power transmitted by the UE1 or the UE2 is within a certain power range, the UE1 is simultaneously Or the pre-coding vector for solving the signal transmission of the UE1 or UE2 is established by the objective function if the signal reliability of the UE2 is the best.
  • FIG. 3 is a flowchart of a method for uplink interference suppression according to Embodiment 2 of the present invention. As shown in FIG. 3, the method includes the following steps: Step 301: Establish an objective function according to a useful signal power transmitted by the user equipment UE, the UE transmission, and a cellular uplink interference power and a noise power, where the target function is used to solve the solution.
  • the precoding vector of the UE signal transmission optionally, the establishing a target function according to the useful signal power transmitted by the user equipment UE, the UE transmission to the cellular uplink interference power and the noise power, including:
  • An objective function is established, the objective function being a ratio of the user signal power transmitted by the UE divided by the sum of the cellular uplink interference power and the noise power of the UE transmission.
  • the objective function and the constraint are
  • W D is a precoding vector of the UE signal transmission
  • H DD is the UE D2D arrow I channel matrix
  • H DB is a channel matrix of the UE transmitting interference to the cellular uplink
  • I is an identity matrix
  • the useful signal power of the device UE is
  • the uplink interference power of the UE is
  • N t is a positive definite Hermitian matrix and is reversible, so there are:
  • the precoding vector can take the feature Vector.
  • Step 303 Process, according to the precoding vector of the UE signal transmission, a signal transmitted by the UE, so that the signal transmitted by the UE has minimal interference to the cellular uplink.
  • the precoding vector W D of the UE signal transmission is multiplied by the channel matrix H DD transmitted by the UE multiplied by the signal X transmitted by the UE, that is, H DD *W D *X, thereby causing the UE
  • the transmitted signal has the least interference to the cellular uplink.
  • FIG. 4 is a comparison diagram of the beneficial effects of the present invention and the prior art provided by an embodiment of the present invention.
  • the solid line indicates the capacity curve of the cellular uplink without interference
  • the dotted line indicates the cellular uplink capacity curve based on the scheme of the present invention
  • the broken line indicates the total capacity curve of the cellular uplink and D2D based on the scheme of the present invention.
  • the interference is small, and the total capacity of the cellular uplink and the D2D is greatly improved with respect to the capacity of the interference-free cellular uplink.
  • the present invention provides a method for uplink interference suppression, where the objective function is to divide the useful signal power of the user equipment UE by the ratio of the uplink interference power and the noise power of the UE, in the constraint, by establishing an objective function.
  • the precoding vector of the signal transmission of the user equipment is a unitary matrix
  • the precoding vector of the signal transmission of the UE is solved according to the objective function, so that the greater the useful signal power of the UE, the better the D2D signal transmission is for the cellular uplink.
  • the design of the precoding vector transmitted by the UE signal can suppress the interference between the D2D transmission link and the cellular uplink transmission link, thereby greatly improving the spectrum efficiency of the system and capacity.
  • FIG. 5 is a flowchart of a method for uplink interference suppression according to Embodiment 3 of the present invention.
  • the method includes the following steps: Step 501: Establish an objective function according to a mean square error of a UE received signal, where the objective function is used to solve a precoding vector of the UE signal transmission; specifically, tr([ I + W D H il z H DD W D ; is the mean square error of the received signal of the UE, and the objective function is ⁇ + ⁇ 1 ).
  • Step 502 Solving the target function in a constraint condition that the uplink interference power of the UE is less than a preset first threshold value and a total signal power of the UE is less than a preset second threshold value. a precoding vector of the signal transmission of the UE; optionally, the uplink interference power of the UE is less than a preset first threshold value, and the total signal power of the UE is less than a preset second threshold value.
  • the objective function and constraints are
  • W D H W D is the total power of the signal transmitted by the UE
  • Iz is the noise covariance matrix
  • ⁇ - ([ ⁇ + ⁇ ⁇ 0 3 ⁇ 4 ⁇ ⁇ ⁇ ⁇ ⁇ 00 ⁇ 0 ⁇ ) signal is received by the UE
  • the mean square error that is, the uplink interference power of the UE is less than a preset first threshold, and the total signal power transmitted by the UE is less than a preset second threshold.
  • the corresponding optimal precoder W1 is found only for the first constraint condition t r (H DB W D W D H i ⁇ B ) ⁇ T and the second constraint condition tr(W D H W D ) ⁇ P respectively. And W2.
  • the above optimization problem has a closed optimal solution.
  • Step 503 Process, according to the precoding vector of the UE signal transmission, a signal transmitted by the UE, so that the signal transmitted by the UE has the least interference to the cellular uplink.
  • the precoding vector W D of the UE signal transmission is multiplied by the channel matrix H DD transmitted by the UE multiplied by the signal X transmitted by the UE, that is, H DD *W D *X, thereby causing the UE
  • the transmitted signal has the least interference to the cellular uplink.
  • the present invention provides a method for uplink interference suppression, where the method is to establish an objective function, where the objective function is a minimum value of a mean square error of a received signal of the UE, and the constraint condition is that the uplink interference power of the UE is less than a preset.
  • FIG. 6 is a structural diagram of a device of a user equipment according to Embodiment 4 of the present invention.
  • the user equipment includes: a first establishing unit 601, configured to use, according to a useful signal power transmitted by the user equipment UE,
  • the UE transmits an objective function for the cellular uplink interference power and the noise power, and the objective function is used to solve the precoding vector of the UE signal transmission; optionally, the first establishing unit is specifically configured to: establish an objective function, The objective function is the user signal power transmitted by the UE divided by the UE transmission The ratio of the input to the sum of the cellular uplink interference power and the noise power ⁇ Specifically, the objective function and the constraint are
  • W D is a precoding vector of the UE signal transmission
  • H DD is the UE D2D arrow I channel matrix
  • H DB is a channel matrix of the UE transmitting interference to the cellular uplink
  • I is an identity matrix
  • the useful signal power of the device UE is tr(W ⁇ H D H DD W D )
  • the uplink interference power of the UE is
  • the first decoding unit 602 includes: a partial guiding unit 701, configured to take the pre-targeting of the UE signal transmission to the target function.
  • the precoding vector used to transmit the UE signal is used as a feature vector corresponding to the A maximum feature value. Lr(WgHg D H DD W D )
  • the precoding vector of the D2D UE signal transmission can take the feature
  • the first processing unit 603 is configured to process, according to the precoding vector of the UE signal transmission, the signal transmitted by the UE, so that the signal transmitted by the UE has the least interference to the cellular uplink.
  • the precoding vector W D of the UE signal transmission is multiplied by the channel matrix H DD transmitted by the UE multiplied by the signal X transmitted by the UE, that is, H DD *W D *X, thereby causing the UE
  • the transmitted signal has the least interference to the cellular uplink.
  • FIG. 4 is a comparison diagram of the beneficial effects of the present invention and the prior art provided by the embodiment of the present invention.
  • the solid line indicates the capacity curve of the cellular uplink without interference
  • the dotted line indicates the cellular uplink capacity curve based on the scheme of the present invention
  • the broken line indicates the cellular uplink and the scheme based on the scheme of the present invention.
  • the total capacity curve of D2D As can be seen from the figure, based on the scheme of the present invention, although there is some interference to the cellular uplink, the interference is small, and the total capacity of the cellular uplink and the D2D is greatly improved with respect to the capacity of the interference-free cellular uplink.
  • the present invention provides a user equipment, where the target function is a ratio of the useful signal power of the user equipment UE divided by the sum of the uplink interference power and the noise power of the UE by establishing an objective function, where the constraint condition is
  • the precoding vector of the signal transmission of the user equipment is a unitary matrix
  • the precoding vector of the signal transmission of the UE is solved according to the objective function, so that the greater the useful signal power of the UE, the better the interference of the D2D signal transmission on the cellular uplink.
  • FIG. 8 is a structural diagram of a device of a user equipment according to Embodiment 5 of the present invention. As shown in FIG.
  • the user equipment includes: a second establishing unit 801, configured to establish an objective function according to a mean square error of a UE received signal, where the target function is used to solve a precoding vector of the UE signal transmission; , tr([I + W D H il z H DD W D ; is the mean square error of the received signal of the UE, and the objective function is ⁇ + ⁇ ⁇ 1 ).
  • a second solving unit 802 configured to solve the problem that the uplink interference power of the UE is less than a preset first threshold value and a total signal power of the UE is less than a preset second threshold value
  • the precoding vector of the UE signal transmission in the target function optionally, the second solving unit 802, the third processing unit 901, configured to: in the first constraint, the uplink interference power of the UE is less than When the first threshold is set, the precoding vector W1 of the first optimal UE signal transmission is solved according to the objective function; and the fourth processing unit 902 is configured to: in the second constraint, the total signal power of the UE transmission When less than a preset second threshold, solving the second optimal UE signal transmission according to the objective function
  • W D H W D is the total power of the signal transmitted by the UE
  • Iz is the noise covariance matrix
  • ⁇ - ([ ⁇ + ⁇ ⁇ 0 3 ⁇ 4 ⁇ ⁇ ⁇ ⁇ ⁇ 00 ⁇ 0 ⁇ ) signal is received by the UE
  • the mean square error that is, the uplink interference power of the UE is less than a preset first threshold, and the total signal power transmitted by the UE is less than a preset second threshold.
  • the corresponding optimal precoder W1 is found only for the first constraint condition t r (H DB W D W D H i ⁇ B ) ⁇ T and the second constraint condition tr(W D H W D ) ⁇ P respectively. And W2.
  • the above optimization problem has a closed optimal solution.
  • the second processing unit 803 is configured to process, according to the precoding vector of the UE signal transmission, a signal transmitted by the UE, so that the signal transmitted by the UE has minimal interference to the cellular uplink.
  • the precoding vector W D of the UE signal transmission is multiplied by the channel matrix H DD transmitted by the UE multiplied by the signal X transmitted by the UE, that is, H DD *W D *X, thereby causing the UE
  • the transmitted signal has the least interference to the cellular uplink.
  • the present invention provides a user equipment, where the target function is a minimum value of the mean square error of the received signal of the UE, and the constraint condition is that the uplink interference power of the UE is less than a preset first.
  • the precoding vector of the UE signal transmission is solved according to the objective function, so that the interference of the UE to the cellular uplink is In the first threshold, the reliability of the UE signal transmission is the best, so that the D2D communication multiplexes the spectrum resources of the cellular communication, and the design of the precoding vector transmitted by the UE signal can suppress the D2D transmission chain. Interference between the road and the cellular uplink transmission link, thereby greatly improving the spectrum efficiency and capacity of the system.
  • FIG. 10 is a structural diagram of a device of a user equipment according to Embodiment 6 of the present invention.
  • FIG. 10 is a user equipment 1000 according to an embodiment of the present invention.
  • the specific implementation of the present invention does not limit the specific implementation of the device.
  • the user equipment 1000 includes:
  • the processor 1001, the communication interface 1002, and the memory 1003 complete communication with each other via the bus 1004.
  • a communication interface 1002 configured to communicate with a base station and other user equipments
  • the processor 1001 is configured to execute a program.
  • the program can include program code, the program code including computer operating instructions.
  • the processor 1001 may be a central processing unit CPU, or an Application Specific Integrated Circuit (ASIC), or one or more integrated circuits configured to implement embodiments of the present invention.
  • ASIC Application Specific Integrated Circuit
  • the memory 1003 is configured to store a program.
  • Memory 1003 may include high-speed RAM memory, and may also include non-volatile memory (non-volatile memory) 0
  • Specific procedures may include: a useful signal according to the transmission power of the user equipment UE, UE transmits the cellular uplink interference and noise power Generating an objective function, the objective function is used to solve a precoding vector of the UE signal transmission; and the UE signal transmission in the objective function is solved under the constraint condition that the precoding vector of the UE signal transmission is a unitary matrix Precoding vector; processing the signal transmitted by the UE according to the precoding vector of the UE signal transmission, so that the signal transmitted by the UE has minimal interference to the cellular uplink.
  • the establishing an objective function according to the useful signal power transmitted by the user equipment UE, the UE transmission to the cellular uplink interference power, and the noise power includes: establishing an objective function, where the target function is a user signal power transmitted by the UE divided by the UE The ratio of the transmission to the sum of the cellular uplink interference power and the noise power.
  • the program includes: establishing an objective function according to a mean square error of the received signal of the UE, where the target function is used to solve a precoding vector of the signal transmission of the UE; and the uplink interference power of the UE is less than a preset first gate Solving a precoding vector of a UE signal transmission in the objective function under a constraint that a limit value and a total signal power of the UE are less than a preset second threshold value; and a precoding vector according to the UE signal transmission
  • the signal transmitted by the UE is processed such that the signal transmitted by the UE has minimal interference to the cellular uplink.
  • the precoding vector of the signal transmission includes: when the first constraint is that the uplink interference power of the UE is less than a preset first threshold, and solving a precoding vector of the first optimal UE signal transmission according to the target function W1 ;

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Abstract

本发明提供一种上行干扰抑制的方法及用户设备，所述方法通过建立目标函数，在约束条件下根据所述目标函数求解所述UE信号传输的预编码向量，使得所述UE有用信号功率越大越好，D2D信号传输对蜂窝上行的干扰越小越好，或者使得所述UE对蜂窝上行的干扰在所述第一门限值内，所述UE信号传输的可靠性最好，从而使得D2D通信复用蜂窝通信的频谱资源的情况下，通过UE信号传输的预编码向量的设计可以抑制D2D传输链路和蜂窝上行传输链路之间的干扰，从而极大提升系统的频谱效率和容量。

Description

一种上行干扰1抑制的方法及设备 本申请要求于 2013 年 1 月 28 日提交中国专利局、 申请号为 201310031046. 5、发明名称为 "一种上行干扰抑制的方法及设备" 的中国专 利申请的优先权， 其全部内容通过引用结合在本申请中。 技术领域
本发明涉及通信领域， 尤其涉及一种上行干扰抑制的方法及设备。 背景技术
目前现有的 3G， 4G蜂窝移动通信系统属于典型的有基础设施网络， 利 用多个小功率发射机代替一个大功率发射机。每个小发射机对应的小覆盖称 为一个小区， 每个小区分配一组信道， 对应于使用一组无线资源， 相邻小区 使用不同的无线资源， 便可使得相互之间不会形成干扰， 相距较远的小区可 以重复使用相同的无线资源， 这就产生了无线信道资源的空间复用， 从而使 系统容量大为提高。
D2D ( Device - to _ device)通信不需要基站或接入节点的控制， 通信 或组网非常灵活。 在蜂窝移动通信系统的终端之间引入终端自组织通信方 式， 将会带来一系列的好处， 一个直接的优势是对于近在咫尺的局部业务可 以不经过基站而直接通过终端之间的中继转发来完成， 从而减少对基站资源 的占用； 二是能够弥补预设网络的覆盖缺陷， 消除现有蜂窝移动通信系统的 覆盖区域内总会存在一些盲区； 三是能够降低功耗， 当通信由一个长路径转 变为几个短路径来实现时， 这几个短路径的功率之和将小于一个长路径所需 要的功率； 另外引入自组织方式将使整个移动通信系统容量得到提高， 增加 空间复用。 但是在 D2D通信复用蜂窝通信的频谱资源的情况下， 如何有效的 控制和管理 D2D与蜂窝通信之间的干扰， 实现 D2D通信与蜂窝通信的有效结 合， 提升系统的频谱效率。 发明内容
本发明实施例的目的在于提供一种上行干扰抑制的方法及设备， 旨在解 决在 D2D 通信复用蜂窝通信的频谱资源的情况下， 如何有效的控制和管理 D2D与蜂窝通信之间干扰的问题。 第一方面， 一种上行干扰抑制的方法， 所述方法包括： 根据用户设备 UE传输的有用信号功率、所述 UE传输对蜂窝上行干扰功 率和噪声功率建立目标函数， 所述目标函数用于求解所述 UE信号传输的预 编码向量； 在所述 UE信号传输的预编码向量为酉矩阵的约束条件下， 求解所述目 标函数中的 UE信号传输的预编码向量； 根据所述 UE信号传输的预编码向量对 UE传输的信号进行处理， 使得所 述 UE传输的信号对蜂窝上行干扰最小。 结合第一方面， 在第一方面的第一种可能的实现方式中， 所述根据用户 设备 UE传输的有用信号功率、所述 UE传输对蜂窝上行干扰功率和噪声功率 建立目标函数， 包括： 建立目标函数， 所述目标函数是 UE传输的用户信号功率除以所述 UE传 输对蜂窝上行干扰功率和噪声功率之和的比值。 结合第一方面或者第一方面的第一种可能的实现方式， 在第一方面的第 二种可能的实现方式中， 所述在所述 UE信号传输的预编码向量为酉矩阵的 约束条件下， 求解所述目标函数中的 UE信号传输的预编码向量， 包括： 对所述目标函数取所述 UE信号传输的预编码向量的偏导， 并且令所述 偏导数为 0， 得到一个等式； 将所述等式的形式转换成 AWD=KWD， 所述 A是矩阵， K是 A 的特征值， WD 为 A的特征值为 K的特征向量； 将所述 UE信号传输的预编码向量取为所述 A的最大的特征值对应的特 征向量。 第二方面， 一种上行干扰抑制的方法， 所述方法包括： 根据 UE接收信号的均方差建立目标函数， 所述目标函数用于求解所述 UE信号传输的预编码向量； 在所述 UE的上行干扰功率小于预先设置的第一门限值和所述 UE传输的 信号总功率小于预先设置的第二门限值的约束条件下， 求解所述目标函数中 述 UE传输的信号对蜂窝上行干扰最小。 结合第二方面，在第二方面的第一种可能的实现方式中，所述在所述 UE 的上行干扰功率小于预先设置的第一门限值和所述 UE传输的信号总功率小 于预先设置的第二门限值的约束条件下， 求解所述目标函数中的 UE信号传 输的预编码向量， 包括： 在第一约束条件是所述 UE 的上行干扰功率小于预先设置的第一门限值 时， 根据所述目标函数求解第一最优 UE信号传输的预编码向量 W1 ; 在第二约束条件是所述 UE传输的信号总功率小于预先设置的第二门限 值时， 根据所述目标函数求解第二最优 UE信号传输的预编码向量 W2 ; 根据公式 WD=c* (a* Wl+b* W2 ) 获得所述目标函数中的 UE信号传输的 预编码向量， 其中 a、 b、 c为常数， a+b=l， 且选择的 c使得 WD满足所述第 一约束条件和所述第二约束条件。 第三方面， 一种用户设备， 所述设备包括： 第一建立单元， 用于根据用户设备 UE传输的有用信号功率、 所述 UE传 输对蜂窝上行干扰功率和噪声功率建立目标函数， 所述目标函数用于求解所 述 UE信号传输的预编码向量； 第一求解单元， 用于在所述 UE信号传输的预编码向量为酉矩阵的约束 条件下， 求解所述目标函数中的 UE信号传输的预编码向量； 第一处理单元， 用于根据所述 UE信号传输的预编码向量对 UE传输的信 号进行处理， 使得所述 UE传输的信号对蜂窝上行干扰最小。 结合第三方面， 在第三方面的第一种可能的实现方式中， 所述第一建立 单元具体用于： 建立目标函数， 所述目标函数是 UE传输的用户信号功率除以所述 UE传 输对蜂窝上行干扰功率和噪声功率之和的比值。 结合第三方面或者第三方面的第一种可能的实现方式， 在第三方面的第 二种可能的实现方式中， 所述第一求解单元， 包括： 偏导单元， 用于对所述目标函数取所述 UE信号传输的预编码向量的偏 导， 并且令所述偏导数为 0， 得到一个等式； 转换单元， 用于将所述等式的形式转换成 AWD=KWD， 所述 A是矩阵， K是 A 的特征值， WD为 A的特征值为 K的特征向量； 第一求解子单元， 用于将所述 UE信号传输的预编码向量取为所述 A的 最大的特征值对应的特征向量。 第四方面， 一种用户设备， 所述设备包括： 第二建立单元， 用于根据 UE接收信号的均方差建立目标函数， 所述目 标函数用于求解所述 UE信号传输的预编码向量； 第二求解单元， 用于在所述 UE的上行干扰功率小于预先设置的第一门 限值和所述 UE传输的信号总功率小于预先设置的第二门限值的约束条件下， 求解所述目标函数中的 UE信号传输的预编码向量； 第二处理单元， 用于根据所述 UE信号传输的预编码向量对 UE传输的信 号进行处理， 使得所述 UE传输的信号对蜂窝上行干扰最小。 结合第四方面， 在第四方面的第一种可能的实现方式中， 所述第二求解 单元， 包括： 第三处理单元， 用于在第一约束条件是所述 UE 的上行干扰功率小于预 先设置的第一门限值时， 根据所述目标函数求解第一最优 UE信号传输的预 编码向量 W1 ; 第四处理单元， 用于在第二约束条件是所述 UE传输的信号总功率小于 预先设置的第二门限值时， 根据所述目标函数求解第二最优 UE信号传输的 预编码向量 W2 ; 第五处理单元， 用于根据公式 WD=c* (a* Wl+b* W2 ) 获得所述目标函数 中的 UE信号传输的预编码向量， 其中 a、 b、 c为常数， a+b=l， 且选择的 c 使得 WD满足所述第一约束条件和所述第二约束条件。
与现有技术相比， 本发明实施方式提供一种上行干扰抑制的方法， 所 述方法通过建立目标函数， 所述目标函数是用户设备 UE的有用信号功率除 以所述 UE的上行干扰功率和噪声功率之和的比值， 在约束条件为用户设备 的信号传输的预编码向量为酉矩阵时， 根据所述目标函数求解所述 UE信号 传输的预编码向量，使得所述 UE有用信号功率越大越好， D2D信号传输对蜂 窝上行的干扰越小越好； 或者通过建立目标函数， 所述目标函数是所述 UE 接收信号的均方差， 在约束条件为所述 UE的上行干扰功率小于预先设置的 第一门限值和所述 UE传输的信号总功率小于预先设置的第二门限值时， 根 据所述目标函数求解所述 UE信号传输的预编码向量， 使得所述 UE对蜂窝上 行的干扰在所述第一门限值内， 所述 UE信号传输的可靠性最好， 从而使得 D2D通信复用蜂窝通信的频谱资源的情况下，通过 UE信号传输的预编码向量 的设计可以抑制 D2D传输链路和蜂窝上行传输链路之间的干扰， 从而极大提 升系统的频谱效率和容量。 附图说明
图 1是本发明实施例提供的一种上行干扰抑制方法应用场景图； 图 2是本发明实施例提供的另一种上行干扰抑制方法应用场景图； 图 3是本发明实施例二提供的一种上行干扰抑制的方法流程图； 图 4是本发明实施例提供的一种本发明与现有技术有益效果对比图； 图 5是本发明实施例三提供的一种上行干扰抑制的方法流程图； 图 6是本发明实施例四提供的一种用户设备的装置结构图；
图 7是本发明实施例四提供的一种用户设备中第一求解单元的装置结构 图；
图 8是本发明实施例五提供的一种用户设备的装置结构图；
图 9是本发明实例五提供的一种用户设备中的第二求解单元的装置结构 10是本发明实施例六提供的一种用户设备的装置结构图
具体实 式
为了使本发明要解决的技术问题、 技术方案及有益效果更加清楚明白， 以下结合附图及实施例， 对本发明进行进一步详细说明。 应当理解， 此处所 描述的具体实施例仅仅用以解释本发明， 并不用于限定本发明。
实施例一
参考图 1， 图 1是本发明实施例提供的一种上行干扰抑制方法应用场景 图。
如图 1所示， 蜂窝上行用户设备 （User Equipment , UE) 与基站 （Base Station, BS )进行通信， 发射端用户设备与接收端用户设备进行 Device to Device (D2D) 传输， 且 D2D传输复用蜂窝上行的频谱资源。 所述发射端用 户设备传输的预编码向量采用本发明的两种预编码方式， 可有效抑制 D2D传 输对蜂窝传输的干扰， 并提高系统的总容量。 所述两种预编码方式分别是在 发射端用户设备传输时有用信号功率越大越好， 同时 D2D传输对蜂窝上行的 干扰越小越好的情况时建立目标函数并求解所述发射端用户设备的信号传 输的预编码向量； 或者在 D2D传输对蜂窝上行的干扰抑制在一定的门限范围 内， D2D传输的总功率在一定的功率范围内时， 同时 D2D传输时信号可靠性 最好的情况下建立目标函数求解所述发射端用户设备的信号传输的预编码 向量。 参考图 2， 图 2是本发明实施例提供的另一种上行干扰抑制方法应用场 景图。
如图 2所示， 蜂窝上行 UE1与 BS 1进行通信， 蜂窝上行 UE2与 BS2进行 通信， 且 UE2和 UE1在相同的频率资源上进行传输， 则所述 UE1或所述 UE2 传输的预编码向量采用本发明的两种预编码方式， 可有效抑制小区间的信号 传输的干扰，并提高系统的总容量。所述两种预编码方式分别是在 UE1或 UE2 传输时有用信号功率越大越好， 同时 UE1或 UE2对另一个小区的干扰越小越 好的情况时建立目标函数并求解所述 UE1或 UE2的信号传输的预编码向量； 或者在所述 UE1或 UE2传输对另一个小区的干扰抑制在一定的门限范围内， 所述 UE1或 UE2传输的总功率在一定的功率范围内时， 同时所述 UE1或 UE2 传输时信号可靠性最好的情况下建立目标函数求解所述 UE1或 UE2的信号传 输的预编码向量。
实施例二
参考图 3， 图 3是本发明实施例二提供的一种上行干扰抑制的方法流程 图。 如图 3所示， 所述方法包括以下步骤： 步骤 301， 根据用户设备 UE传输的有用信号功率、 所述 UE传输对蜂窝 上行干扰功率和噪声功率建立目标函数， 所述目标函数用于求解所述 UE信 号传输的预编码向量； 可选地， 所述根据用户设备 UE传输的有用信号功率、 所述 UE传输对蜂 窝上行干扰功率和噪声功率建立目标函数， 包括： 建立目标函数， 所述目标函数是 UE传输的用户信号功率除以所述 UE传 输对蜂窝上行干扰功率和噪声功率之和的比值。 具体的， 所述目标函数和约束条件是
Figure imgf000011_0001
其中， WD是所述 UE信号传输的预编码向量； HDD是所述 UE D2D传箭 I 信道矩阵； HDB是所述 UE传输对蜂窝上行的干扰的信道矩阵； I是单位矩阵; 用户设备 UE的有用信号功率是
Figure imgf000011_0002
tr(W^H gBH DBWD )
:述 UE的上行干扰功率是
:述噪声功率是 σ
WD HWD = 1为约束条件， 即希望 UE信号传输的预编码向量 WD为酉矩阵, 步骤 302，在所述 UE信号传输的预编码向量为酉矩阵的约束条件下，求 解所述目标函数中的 UE信号传输的预编码向量； 可选地， 所述在所述 UE信号传输的预编码向量为酉矩阵的约束条件下， 求解所述目标函数中的 UE信号传输的预编码向量， 包括： 对所述目标函数取所述 UE信号传输的预编码向量的偏导， 并且令所述 偏导数为 0， 得到一个等式； 将所述等式的形式转换成 AWD=KWD， 所述 A是矩阵， K是 A 的特征值， WD 为 A的特征值为 K的特征向量； 将所述 UE信号传输的预编码向量取为所述 A的最大的特征值对应的
tr(W H DHDDWD)
征向量。 对目标函数 (WD HH BHDBWD) + I7 求 WD的偏导数， 并且令所述偏导数为 0， 则有
tr(WD HH« HDBWD) + CT- DB DB Nt D
其中 Nt 为正定 Hermitian矩阵且可逆， 因此有:
tr(W^H^DHDDWD)
lr(WD HH^BHDBWD) + a2
'-CH^H^)的最大特征值对应的特征向量使得
Figure imgf000012_0001
预编码向量即可取所述特征 向量。
因为 H DHDD 为 N*N的 Hermitian矩阵， HgBHDB + I为正定 Hermit ian矩 阵且可逆， 无需要求 UE天线数大于 BS接收天线数， 适用于任意 UE， BS天线配 置。 步骤 303， 根据所述 UE信号传输的预编码向量对 UE传输的信号进行处 理， 使得所述 UE传输的信号对蜂窝上行干扰最小。 具体的，将所述 UE信号传输的预编码向量 WD乘以所述 UE传输的信道矩 阵 HDD乘以所述 UE传输的信号 X， 即 HDD *WD*X， 从而使得所述 UE传输的信号 对蜂窝上行干扰最小。
如图 4所示， 图 4是本发明实施例提供的一种本发明与现有技术有益效果 对比图。 其中实线表示无干扰情况下蜂窝上行的容量曲线， 点划线表示基于 本发明方案中的蜂窝上行容量曲线， 虚线表示基于本发明方案的蜂窝上行和 D2D的总容量曲线。 由图可以看出， 基于本发明方案， 虽然对蜂窝上行有一 定干扰， 但是这种干扰很小， 而且蜂窝上行和 D2D的总容量相对于无干扰蜂 窝上行的容量有大幅度的提升。 本发明提供一种上行干扰抑制的方法， 所述方法通过建立目标函数， 所述目标函数是用户设备 UE的有用信号功率除以所述 UE的上行干扰功率和 噪声功率之和的比值， 在约束条件为用户设备的信号传输的预编码向量为酉 矩阵时， 根据所述目标函数求解所述 UE信号传输的预编码向量， 使得所述 UE有用信号功率越大越好， D2D信号传输对蜂窝上行的干扰越小越好， 从而 使得 D2D通信复用蜂窝通信的频谱资源的情况下， 通过 UE信号传输的预编 码向量的设计可以抑制 D2D传输链路和蜂窝上行传输链路之间的干扰， 从而 极大提升系统的频谱效率和容量。 实施例三
参考图 5， 图 5是本发明实施例三提供的一种上行干扰抑制的方法流程 图。 如图 5所示， 所述方法包括以下步骤： 步骤 501，根据 UE接收信号的均方差建立目标函数，所述目标函数用于 求解所述 UE信号传输的预编码向量； 具体的， tr([I + WD Hi lzHDDWD; 是 所述 UE接收信号的均方差， 目标 函数是 ΐτφ + λ^Η^ΙζΗ^λν^1)。 步骤 502，在所述 UE的上行干扰功率小于预先设置的第一门限值和所述 UE传输的信号总功率小于预先设置的第二门限值的约束条件下，求解所述目 标函数中的 UE信号传输的预编码向量； 可选地， 所述在所述 UE的上行干扰功率小于预先设置的第一门限值和 所述 UE传输的信号总功率小于预先设置的第二门限值的约束条件下， 求解 所述目标函数中的 UE信号传输的预编码向量， 包括： 在第一约束条件是所述 UE 的上行干扰功率小于预先设置的第一门限值 时， 根据所述目标函数求解第一最优 UE信号传输的预编码向量 W1 ; 在第二约束条件是所述 UE传输的信号总功率小于预先设置的第二门限 值时， 根据所述目标函数求解第二最优 UE信号传输的预编码向量 W2; 根据公式 WD=c* (a* Wl+b* W2 ) 获得所述目标函数中的 UE信号传输 预编码向量， 其中 a、 b、 c为常数， a+b=l， 且选择的 c使得 WD满足所述 一约束条件和所述第二约束条件。 具体 ί i述目标函数和约束条件是
min tr([I + WD HP lzHDDWD ） tr(HDBWDWD¾SB) < T
tr(WD HWD) < P
其中， WD HWD是所述 UE传输的信号总功率， Iz为噪声的协方差矩阵， ΰ-([ΐ + \ν0¾^ΙζΗ00λν0^)是 所述 UE接收信号的均方差， Τ是所述 UE的上行干 扰功率小于预先设置的第一门限值， Ρ所述 UE传输的信号总功率小于预先设 置的第二门限值。
具体的， 分别只针对第一约束条件 tr(HDBWDWD Hi^B ) < T和第二约束条件 tr(WD HWD) < P找到对应的最优预编码器 W1和 W2.当只考虑第一约束条件或第 二约束条件时， 上述优化问题有闭式最优解。
最后的预编码器为 WD=c* (a*Wl + b*W2 ) ， 其中 a, b和 c为常数， a+b=l， 且选择縮放因子 c使得第一约束条件和第二约束条件都得到满足。 步骤 503， 根据所述 UE信号传输的预编码向量对 UE传输的信号进行处 理， 使得所述 UE传输的信号对蜂窝上行干扰最小。 具体的，将所述 UE信号传输的预编码向量 WD乘以所述 UE传输的信道矩 阵 HDD乘以所述 UE传输的信号 X， 即 HDD *WD*X， 从而使得所述 UE传输的信号 对蜂窝上行干扰最小。 本发明提供一种上行干扰抑制的方法， 所述方法通过建立目标函数， 所述目标函数是所述 UE接收信号的均方差的最小值， 在约束条件为所述 UE 的上行干扰功率小于预先设置的第一门限值和所述 UE传输的信号总功率小 于预先设置的第二门限值时， 根据所述目标函数求解所述 UE信号传输的预 编码向量， 使得使得所述 UE对蜂窝上行的干扰在所述第一门限值内， 所述 UE信号传输的可靠性最好，从而使得 D2D通信复用蜂窝通信的频谱资源的情 况下， 通过 UE信号传输的预编码向量的设计可以抑制 D2D传输链路和蜂窝 上行传输链路之间的干扰， 从而极大提升系统的频谱效率和容量。 实施例四 参考图 6， 图 6是本发明实施例四提供的一种用户设备的装置结构图。 如图 6所示， 所述用户设备包括： 第一建立单元 601， 用于根据用户设备 UE传输的有用信号功率、 所述
UE传输对蜂窝上行干扰功率和噪声功率建立目标函数，所述目标函数用于求 解所述 UE信号传输的预编码向量； 可选地， 所述第一建立单元具体用于： 建立目标函数， 所述目标函数是 UE传输的用户信号功率除以所述 UE传 输对蜂窝上行干扰功率和噪声功率之和的比值 < 具体的， 所述目标函数和约束条件是
Figure imgf000017_0001
其中， WD是所述 UE信号传输的预编码向量； HDD是所述 UE D2D传箭 I 信道矩阵； HDB是所述 UE传输对蜂窝上行的干扰的信道矩阵； I是单位矩阵; 用户设备 UE的有用信号功率是 tr(W^H DHDDWD)
tr(W^H gBH DBWD )
:述 UE的上行干扰功率是
:述噪声功率是 σ
WD HWD = 1为约束条件， 即希望 UE信号传输的预编码向量 WD为酉矩阵, 第一求解单元 602，用于在所述 UE信号传输的预编码向量为酉矩阵的约 束条件下， 求解所述目标函数中的 UE信号传输的预编码向量； 可选地， 所述第一求解单元 602包括: 偏导单元 701，用于对所述目标函数取所述 UE信号传输的预编码向: 偏导， 并且令所述偏导数为 0， 得到一个等式； 转换单元 702， 用于将所述等式的形式转换成 AWD=KWD， 所述 A是矩阵， A 的特征值， WD为 A的特征值为 K的特征向量； 第一求解子单元 703， 用于将所述 UE信号传输的预编码向量取为所述 A 最大的特征值对应的特征向量。 lr(WgHgDHDDWD)
对目标函数 tr(W«HgBHDBWD) + CT ; 求 WD的偏导数， 并且令所述偏导数为 0， 则有 tr(WD¾gDHDDWD)
tr(Wn HH« HDRWn) + CT 2 Nt
σ
其中 为正定 Hermitian矩阵且可逆， 因此有:
lr(WgHgDHDDWD)
Figure imgf000018_0001
(HDBHDB +
从上式可看出
Figure imgf000018_0002
lr(WgHgDHDDWD)
lr(W«HgBHDBWD) + CT 2
最大， D2D UE信号传输的预编码向量即可取所述特征
向量。 因为 H DHDD 为 N*N的 Hermitian矩阵， HgBHDB + I为正定 Hermit ian矩 阵且可逆， 无需要求 UE天线数大于 BS接收天线数， 适用于任意 UE， BS天线配 置。 第一处理单元 603， 用于根据所述 UE信号传输的预编码向量对 UE传输 的信号进行处理， 使得所述 UE传输的信号对蜂窝上行干扰最小。 具体的，将所述 UE信号传输的预编码向量 WD乘以所述 UE传输的信道矩 阵 HDD乘以所述 UE传输的信号 X， 即 HDD *WD*X， 从而使得所述 UE传输的信号 对蜂窝上行干扰最小。
如图 4所示， 图 4是本发明实施例提供的一种本发明与现有技术有益效果 对比图。 其中实线表示无干扰情况下蜂窝上行的容量曲线， 点划线表示基于 本发明方案中的蜂窝上行容量曲线， 虚线表示基于本发明方案的蜂窝上行和
D2D的总容量曲线。 由图可以看出， 基于本发明方案， 虽然对蜂窝上行有一 定干扰， 但是这种干扰很小， 而且蜂窝上行和 D2D的总容量相对于无干扰蜂 窝上行的容量有大幅度的提升。 本发明提供一种用户设备， 所述用户设备通过建立目标函数， 所述目 标函数是用户设备 UE的有用信号功率除以所述 UE的上行干扰功率和噪声功 率之和的比值， 在约束条件为用户设备的信号传输的预编码向量为酉矩阵 时， 根据所述目标函数求解所述 UE信号传输的预编码向量， 使得所述 UE有 用信号功率越大越好， D2D信号传输对蜂窝上行的干扰越小越好， 从而使得 D2D通信复用蜂窝通信的频谱资源的情况下，通过 UE信号传输的预编码向量 的设计可以抑制 D2D传输链路和蜂窝上行传输链路之间的干扰， 从而极大提 升系统的频谱效率和容量。 实施例五 参考图 8， 图 8是本发明实施例五提供的一种用户设备的装置结构图。 如图 8所示， 所述用户设备包括： 第二建立单元 801，用于根据 UE接收信号的均方差建立目标函数，所述 目标函数用于求解所述 UE信号传输的预编码向量； 具体的， tr([I + WD Hi lzHDDWD; 是 所述 UE接收信号的均方差， 目标 函数是 ΰ^Ι + λ^Η^ Η^λν^1)。 第二求解单元 802，用于在所述 UE的上行干扰功率小于预先设置的第一 门限值和所述 UE传输的信号总功率小于预先设置的第二门限值的约束条件 下， 求解所述目标函数中的 UE信号传输的预编码向量； 可选地， 所述第二求解单元 802， 包括： 第三处理单元 901，用于在第一约束条件是所述 UE的上行干扰功率小于 预先设置的第一门限值时， 根据所述目标函数求解第一最优 UE信号传输的 预编码向量 W1 ; 第四处理单元 902，用于在第二约束条件是所述 UE传输的信号总功率小 于预先设置的第二门限值时， 根据所述目标函数求解第二最优 UE信号传输 第五处理单元 903， 用于根据公式 WD=c* (a* Wl+b* W2 ) 获得所述目标 函数中的 UE信号传输的预编码向量， 其中 a、 b、 c为常数， a+b=l， 且选择 的 c使得 WD满足所述第一约束条件和所述第二约束条件。 具体 ί i述目标函数和约束条件是
min tr([I + WD HP lzHDDWD ） tr(HDBWDWD¾SB) < T
tr(WD HWD) < P
其中， WD HWD是所述 UE传输的信号总功率， Iz为噪声的协方差矩阵， ΰ-([ΐ + \ν0¾^ΙζΗ00λν0^)是 所述 UE接收信号的均方差， Τ是所述 UE的上行干 扰功率小于预先设置的第一门限值， Ρ所述 UE传输的信号总功率小于预先设 置的第二门限值。
具体的， 分别只针对第一约束条件 tr(HDBWDWD Hi^B ) < T和第二约束条件 tr(WD HWD) < P找到对应的最优预编码器 W1和 W2.当只考虑第一约束条件或第 二约束条件时， 上述优化问题有闭式最优解。
最后的预编码器为 WD=c* (a*Wl + b*W2 ) ， 其中 a, b和 c为常数， a+b=l， 且选择縮放因子 c使得第一约束条件和第二约束条件都得到满足。 第二处理单元 803， 用于根据所述 UE信号传输的预编码向量对 UE传输 的信号进行处理， 使得所述 UE传输的信号对蜂窝上行干扰最小。 具体的，将所述 UE信号传输的预编码向量 WD乘以所述 UE传输的信道矩 阵 HDD乘以所述 UE传输的信号 X， 即 HDD *WD*X， 从而使得所述 UE传输的信号 对蜂窝上行干扰最小。 本发明提供一种用户设备， 所述设备通过建立目标函数， 所述目标函 数是所述 UE接收信号的均方差的最小值， 在约束条件为所述 UE的上行干扰 功率小于预先设置的第一门限值和所述 UE传输的信号总功率小于预先设置 的第二门限值时， 根据所述目标函数求解所述 UE信号传输的预编码向量， 使得使得所述 UE对蜂窝上行的干扰在所述第一门限值内， 所述 UE信号传输 的可靠性最好， 从而使得 D2D通信复用蜂窝通信的频谱资源的情况下， 通过 UE信号传输的预编码向量的设计可以抑制 D2D传输链路和蜂窝上行传输链 路之间的干扰， 从而极大提升系统的频谱效率和容量。 实施例六
参考图 10，图 10是本发明实施例六提供的一种用户设备的装置结构图。 参考图 10， 图 10是本发明实施例提供的一种用户设备 1000， 本发明具体实 施例并不对所述设备的具体实现做限定。 所述用户设备 1000包括：
处理器 (processor) 1001 , 通信接口 (Communications Interface) 1002 , 存储器（memory) 1003， 总线 1004。
处理器 1001， 通信接口 1002， 存储器 1003通过总线 1004完成相互间 的通信。
通信接口 1002， 用于与基站和其他用户设备进行通信；
处理器 1001， 用于执行程序。
具体地， 程序可以包括程序代码， 所述程序代码包括计算机操作指令。 处理器 1001 可能是一个中央处理器 CPU, 或者是特定集成电路 ASIC (Application Specific Integrated Circuit ), 或者是被配置成实施本发 明实施例的一个或多个集成电路。
存储器 1003， 用于存放程序。 存储器 1003可能包含高速 RAM存储器， 也可能还包括非易失性存储器（non-volatile memory )0程序具体可以包括： 根据用户设备 UE传输的有用信号功率、所述 UE传输对蜂窝上行干扰功 率和噪声功率建立目标函数， 所述目标函数用于求解所述 UE信号传输的预 编码向量； 在所述 UE信号传输的预编码向量为酉矩阵的约束条件下， 求解所述目 标函数中的 UE信号传输的预编码向量； 根据所述 UE信号传输的预编码向量对 UE传输的信号进行处理， 使得所 述 UE传输的信号对蜂窝上行干扰最小。 所述根据用户设备 UE传输的有用信号功率、所述 UE传输对蜂窝上行干 扰功率和噪声功率建立目标函数， 包括： 建立目标函数， 所述目标函数是 UE传输的用户信号功率除以所述 UE传 输对蜂窝上行干扰功率和噪声功率之和的比值。 所述在所述 UE信号传输的预编码向量为酉矩阵的约束条件下， 求解所 述目标函数中的 UE信号传输的预编码向量， 包括： 对所述目标函数取所述 UE信号传输的预编码向量的偏导， 并且令所述 偏导数为 0， 得到一个等式; 将所述等式的形式转换成 AWD=KWD， 所述 A是矩阵， K是 A 的特征值， W, 为 A的特征值为 K的特征向量； 将所述 UE信号传输的预编码向量取为所述 A的最大的特征值对应的特 征向量。 或者， 所述程序包括： 根据 UE接收信号的均方差建立目标函数， 所述目标函数用于求解所述 UE信号传输的预编码向量； 在所述 UE的上行干扰功率小于预先设置的第一门限值和所述 UE传输的 信号总功率小于预先设置的第二门限值的约束条件下， 求解所述目标函数中 的 UE信号传输的预编码向量； 根据所述 UE信号传输的预编码向量对 UE传输的信号进行处理， 使得所 述 UE传输的信号对蜂窝上行干扰最小。 所述在所述 UE的上行干扰功率小于预先设置的第一门限值和所述 UE传 输的信号总功率小于预先设置的第二门限值的约束条件下， 求解所述目标函 数中的 UE信号传输的预编码向量， 包括： 在第一约束条件是所述 UE 的上行干扰功率小于预先设置的第一门限值 时， 根据所述目标函数求解第一最优 UE信号传输的预编码向量 W1 ; 在第二约束条件是所述 UE传输的信号总功率小于预先设置的第二门限 值时， 根据所述目标函数求解第二最优 UE信号传输的预编码向量 W2; 根据公式 WD=c* (a* Wl+b* W2 ) 获得所述目标函数中的 UE信号传输的 预编码向量， 其中 a、 b、 c为常数， a+b=l， 且选择的 c使得 WD满足所述第 一约束条件和所述第二约束条件。 以上所述仅为本发明的较佳实施例而已， 并不用以限制本发明， 凡在本 发明之内所作的任何修改、 等同替换和改进等， 均应包含在本发明的保护范 围之内。

Claims

权 利 要 求
1、 一种上行干扰抑制的方法， 其特征在于， 所述方法包括： 根据用户设备 UE传输的有用信号功率、所述 UE传输对蜂窝上行干扰功 率和噪声功率建立目标函数， 所述目标函数用于求解所述 UE信号传输的预 编码向量； 在所述 UE信号传输的预编码向量为酉矩阵的约束条件下， 求解所述目 标函数中的 UE信号传输的预编码向量； 根据所述 UE信号传输的预编码向量对 UE传输的信号进行处理， 使得所 述 UE传输的信号对蜂窝上行干扰最小。
2、 根据权利要求 1所述的方法， 其特征在于， 所述根据用户设备 UE传 输的有用信号功率、 所述 UE传输对蜂窝上行干扰功率和噪声功率建立目标 函数， 包括： 建立目标函数， 所述目标函数是 UE传输的用户信号功率除以所述 UE传 输对蜂窝上行干扰功率和噪声功率之和的比值。
3、 根据权利要求 1或 2所述的方法， 其特征在于， 所述在所述 UE信号 传输的预编码向量为酉矩阵的约束条件下， 求解所述目标函数中的 UE信号 传输的预编码向量， 包括： 对所述目标函数取所述 UE信号传输的预编码向量的偏导， 并且令所述 偏导数为 0， 得到一个等式; 将所述等式的形式转换成 AWD=KWD， 所述 A是矩阵， K是 A 的特征值， W, 为 A的特征值为 K的特征向量； 将所述 UE信号传输的预编码向量取为所述 A的最大的特征值对应的特 征向量。
4、 一种上行干扰抑制的方法， 其特征在于， 所述方法包括： 根据 UE接收信号的均方差建立目标函数， 所述目标函数用于求解所述 UE信号传输的预编码向量； 在所述 UE的上行干扰功率小于预先设置的第一门限值和所述 UE传输的 信号总功率小于预先设置的第二门限值的约束条件下， 求解所述目标函数中 的 UE信号传输的预编码向量； 根据所述 UE信号传输的预编码向量对 UE传输的信号进行处理， 使得所 述 UE传输的信号对蜂窝上行干扰最小。
5、 根据权利要求 4所述的方法， 其特征在于， 所述在所述 UE的上行干 扰功率小于预先设置的第一门限值和所述 UE传输的信号总功率小于预先设 置的第二门限值的约束条件下， 求解所述目标函数中的 UE信号传输的预编 码向量， 包括： 在第一约束条件是所述 UE 的上行干扰功率小于预先设置的第一门限值 时， 根据所述目标函数求解第一最优 UE信号传输的预编码向量 W1 ; 在第二约束条件是所述 UE传输的信号总功率小于预先设置的第二门限 值时， 根据所述目标函数求解第二最优 UE信号传输的预编码向量 W2 ; 根据公式 WD=c* (a* Wl+b* W2 ) 获得所述目标函数中的 UE信号传输的 预编码向量， 其中 a、 b、 c为常数， a+b=l， 且选择的 c使得 WD满足所述第 一约束条件和所述第二约束条件。
6、 一种用户设备， 其特征在于， 所述设备包括： 第一建立单元， 用于根据用户设备 UE传输的有用信号功率、 所述 UE传 输对蜂窝上行干扰功率和噪声功率建立目标函数， 所述目标函数用于求解所 述 UE信号传输的预编码向量； 第一求解单元， 用于在所述 UE信号传输的预编码向量为酉矩阵的约束 条件下， 求解所述目标函数中的 UE信号传输的预编码向量； 第一处理单元， 用于根据所述 UE信号传输的预编码向量对 UE传输的信 号进行处理， 使得所述 UE传输的信号对蜂窝上行干扰最小。
7、 根据权利要求 6所述的设备， 其特征在于， 所述第一建立单元具体 用于： 建立目标函数， 所述目标函数是 UE传输的用户信号功率除以所述 UE传 输对蜂窝上行干扰功率和噪声功率之和的比值。
8、 根据权利要求 6或 7所述的设备， 其特征在于， 所述第一求解单元 包括： 偏导单元， 用于对所述目标函数取所述 UE信号传输的预编码向量的偏 导， 并且令所述偏导数为 0， 得到一个等式； 转换单元， 用于将所述等式的形式转换成 AWD=KWD， 所述 A是矩阵， K是
A 的特征值， WD为 A的特征值为 K的特征向量； 第一求解子单元， 用于将所述 UE信号传输的预编码向量取为所述 A的 最大的特征值对应的特征向量。
9、 一种用户设备， 其特征在于， 所述设备包括： 第二建立单元， 用于根据 UE接收信号的均方差建立目标函数， 所述目 标函数用于求解所述 UE信号传输的预编码向量； 第二求解单元， 用于在所述 UE的上行干扰功率小于预先设置的第一门 限值和所述 UE传输的信号总功率小于预先设置的第二门限值的约束条件下， 求解所述目标函数中的 UE信号传输的预编码向量； 第二处理单元， 用于根据所述 UE信号传输的预编码向量对 UE传输的信 号进行处理， 使得所述 UE传输的信号对蜂窝上行干扰最小。
10、 根据权利要求 9所述的设备， 其特征在于， 所述第二求解单元， 包 括： 第三处理单元， 用于在第一约束条件是所述 UE 的上行干扰功率小于预 先设置的第一门限值时， 根据所述目标函数求解第一最优 UE信号传输的预 编码向量 W1 ; 第四处理单元， 用于在第二约束条件是所述 UE传输的信号总功率小于 预先设置的第二门限值时， 根据所述目标函数求解第二最优 UE信号传输的 预编码向量 W2 ; 第五处理单元， 用于根据公式 WD=c* (a* Wl+b* W2 ) 获得所述目标函数 中的 UE信号传输的预编码向量， 其中 a、 b、 c为常数， a+b=l， 且选择的 c 使得 WD满足所述第一约束条件和所述第二约束条件。
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