38 results about "Quantized feedback" patented technology

Multi-user (MU-) MIMO systems with quantized feedback are designed to maximize the sum-rate via scheduling and linear precoding. To maximize throughput over the network, quantized CSIT is sent through a low-rate feedback link feedback from a plurality of users back to a base station. The base station then determines a subset of the plurality of users to transmit one or more signals to based on the received feedback and determines a preceding matrix based on the received feedback from the plurality of users wherein the precoding matrix maximizes a sum-rate throughput for the subset of the plurality of users. Additionally, based on the received feedback, the base station designs a quantization codebook. This codebook may be designed off-line and / or online. The codebook and / or precoding matrix are used to transmit signals to the users.

Techniques are provided for reducing feedback while maintaining performance in a MIMO-OFDM system. The disclosed techniques employ finite-rate feedback methods that uses vector quantization compression. The disclosed methods / techniques generally involve: receiving a plurality of symbols from a plurality of sub-carriers at a receiver; selecting a plurality of indices of codewords corresponding to a codebook of pre-coding weighting matrices for the sub-carriers based on vector quantization compression of the codewords; and transmitting the selected indices over a wireless channel to a transmitter. Finite state vector quantization feedback makes use of a finite state vector quantizer (FSVQ), which is a recursive vector quantizer (VQ) with a finite number of states. In finite state vector quantization feedback, optimal precoding matrices (beamforming vectors) are selected sequentially across subcarriers. In a trellis-based feedback method, the optimal precoding matrices are selected at the same time for all subcarriers by searching for the optimum choice of matrices along a trellis using the Viterbi algorithm (dynamic programming).

The invention discloses a channel information quantized feedback method and device and a data precoding method and device. The channel information quantized feedback method comprises the following steps: receiving a channel measuring pilot signal from a base station; performing channel measurement according to the channel measuring pilot signal to obtain channel information; calculating CMatrix1 and CMatrix2 by adopting the channel information, wherein the CMatrix1 and the CMatrix2 are used for quantifying the channel information or instructing a base station to perform precoding; and feeding back first indicating information of the CMatrix1 and / or second indicating information of the CMatrix2 to the base station. According to a technical scheme provided by the invention, the influence of polarization leakage is considered in feedback design, so that a remarkable performance gain exists under the practical situation of polarization leakage.

The present invention relates to a method for adapting the feedback rate of a quantized representation of the propagation channel in a capacity-limited feedback channel. The method comprises obtaining a reference signal from an access point; deriving a rank indication, a codebook subset selection indication and a precoding matrix index based on the obtained reference signal; sending a first feedback message conveying the rank indication and the codebook subset selection indication, and sending a second feedback message conveying the precoding matrix index, to the access point; and receiving, from the access point, data precoded by a matrix derived based on the rank indication, the codebook subset selection indication and the precoding matrix index.

A power control design for multiple antenna communication systems is herein disclosed which uses an optimized quantized feedback link between the receiver and the transmitter.

The invention discloses a channel information feedback method and a system. The channel information feedback method comprises the following steps: a pre-coding matrix required to be fed back can be decomposed into the product of a plurality of Givens rotating matrixes, wherein each rotating matrix is only related to a rotating angle; and the corresponding rotating angle of the rotating matrix after being decomposed is fed back. The method and the system provided by the invention are a channel compression quantized feedback solution based on the Givens transformation, wherein the pre-coding matrix required to be fed back can be transformed into a limited angle value through continuous Givens rotation, and a base station can rebuild a channel matrix by using the fed-back quantitative angles so as to calculate a pre-coding vector, so that the feedback cost can be effectively reduced. Compared with the traditional scalar quantization, the channel information feedback method can effectively reduce the number of the quantitative elements, thereby decreasing the feedback quantity. With respect to the vector quantization, the only requirement is to carry out the operation of decomposition and quantization, so that the system complexity can be effectively lowered under the condition of ensuring the system performance.

The invention relates to a quantitative CSI feedback method and a terminal. The terminal obtains configuration information of a channel measurement pilot frequency and the CSI feedback type sent by a base station, the configuration information of the channel measurement pilot frequency comprises K sets of pilot-frequency configuration information, and K>=1; and the terminal determines a quantitative CSI feedback method according to a value of K and the configuration information of the CSI feedback type, and quantitative CSI feedback is carried out according to the quantitative CSI feedback method. The terminal comprises a quantitative CSI feedback device, and the quantitative CSI feedback device comprises an information obtaining module and a quantitative feedback module. CSI feedback of FDD and TDD can be realized via unified configuration, and a CQI calculation method and CSI report content are determined according to the value of K.

Multi-user (MU-) MIMO systems with quantized feedback are designed to maximize the sum-rate via scheduling and linear precoding. To maximize throughput over the network, quantized CSIT is sent through a low-rate feedback link feedback from a plurality of users back to a base station. The base station then determines a subset of the plurality of users to transmit one or more signals to based on the received feedback and determines a preceding matrix based on the received feedback from the plurality of users wherein the precoding matrix maximizes a sum-rate throughput for the subset of the plurality of users. Additionally, based on the received feedback, the base station designs a quantization codebook. This codebook may be designed off-line and / or online. The codebook and / or precoding matrix are used to transmit signals to the users.

A method and apparatus for avoiding and or recovering from the latch-up condition in a quantized feedback DC restorer circuit for use in a digital data communication system receiver. An automatic gain control (AGC) circuit controls the level of the received data by comparing the AGC output with a quantized output signal from the DC restorer. A carrier detect circuit detects the presence of data transitions in the quantized output signal, and in the absence of such transitions continuously ramps up the gain of the AGC until such transitions are detected. The carrier detect circuit can be further used to disable, either entirely or partially, the positive feedback path of the DC restorer in the absence of transition in the quantized output signal. The present invention further provides an inherent muting function of the DC restorer output signal in the absence of valid data transitions.

The invention provides a codebook restriction signaling transmitting and channel information quantized feedback method and device. The codebook restriction signaling transmitting method comprises the steps that codebooks corresponding to different rank indications RI in channel information feedback are determined; the codebooks corresponding to different RI are grouped into preset number of groups according to the RI, wherein the preset number is greater than or equal to 2; the codebook restriction modes corresponding to the codebooks in the preset number of groups are determined, wherein the first number of groups in the preset number of groups adopt the first codebook restriction mode, the second number of groups in the preset number of groups adopt the second codebook restriction mode, and the first codebook restriction mode and the second codebook restriction mode are different; and codebook restriction signaling transmitting is performed according to the determined codebook restriction mode. The problem existing in the related technologies of high overhead caused by using the codebook restriction mode in the related technologies can be solved so as to achieve the effect of reducing the resource overhead of codebook restriction.

The invention discloses a channel acquisition method, a base station, a user terminal, and a large-scale antenna system. The method comprises the following steps: grouping downlink antennas; acquiringphase information of downlink channels according to a quantized feedback of the user terminal for partial or all antenna subgroup channels; acquiring amplitude information of the downlink channels according to an uplink reference signal; and reconstructing downlink channel information according to the phase information and the amplitude information. The channel acquisition method provided by theinvention effectively controls the system cost of acquiring the channel information in a multi-antenna system, reduces the complexity of the implementation, and solves the problem of channel information acquisition of the large-scale antenna system.

Channel state information for closed-loop transmit precoding in MIMO networks is fed back from the MSs to the BSs. The feedback is quantized using codebooks shared by the MSs and BSs to reduce overhead. The codebooks can be full-rank or rank-one. The quantized feedback is applicable to any definitions of MIMO channel covariance matrix as well as MIMO channel matrix. Since these codebooks are designed for closed-loop MIMO precoded transmissions, no additional memory is needed to store the codebooks at the BS and the MS only for the quantized feedback purposes.

The invention discloses a coordinated multi-point transmission downlink precoding algorithm for timing synchronous reciprocity errors. In the application scene where the timing synchronous reciprocity errors are approximately constant, the errors can be supplemented by the algorithm when precoding vectors or matrixes are designed through MMSE channel estimation, RVQ quantized feedback, LS error estimation and linear interpolation. In the application scene where the timing synchronous reciprocity errors change in real time, the lower bound of SLNR can be averaged to the maximum degree by the algorithm through a probability density function of the errors, and then robust precoding vectors or matrixes are acquired. In a coordinated multi-point transmission system in a TDD mode, compared with a traditional precoding algorithm, the algorithm can avoid the influence of the timing synchronous reciprocity errors on the orthogonality between the precoding vectors or matrixes, better eliminate interference between users or cells, and increase the capacity of the system.

The embodiment of the invention provides a CSI sending method and a device, a CSI receiving method and a device, a communication node and a storage medium. The method comprises the following steps: decomposing a CSI matrix H to obtain a vector group; wherein the vector group at least comprises two vector matrixes; quantizing element information in at least one vector matrix in the vector group; according to the method of the invention, the quantized element information is sent, and in some implementation processes, the quantized feedback can be carried out based on the element information in the vector group after CSI matrix decomposition, so that the modes of CSI quantized feedback are enriched, and more implementation modes are provided for CSI quantized feedback.

The present invention relates to a method for adapting the feedback rate of a quantized representation of the propagation channel in a capacity-limited feedback channel. The method comprises obtaining a reference signal from an access point; deriving a rank indication, a codebook subset selection indication and a precoding matrix index based on the obtained reference signal; sending a first feedback message conveying the rank indication and the codebook subset selection indication, and sending a second feedback message conveying the precoding matrix index, to the access point; and receiving, from the access point, data precoded by a matrix derived based on the rank indication, the codebook subset selection indication and the precoding matrix index.

Described herein is an improved apparatus for increasing the performance of a ΣΔ modulator, which may function as an ADC. In one embodiment, the ΣΔ modulator comprises a voltage to current converter, a capacitor connected between two outputs of the voltage to current converter to receive a differential input current, and a switch that can switch between connecting each output of the voltage to current converter to ground while disconnecting the other output of the voltage to current converter. In this embodiment, the ΣΔ modulator has no common mode control loop, and no reference current. This results in decreased complexity, i.e., fewer components, as well as reduced noise.

Described herein is an improved apparatus for increasing the performance of a ΣΔ modulator, which may function as an ADC. In one embodiment, the ΣΔ modulator comprises a voltage to current converter, a capacitor connected between two outputs of the voltage to current converter to receive a differential input current, and a switch that can switch between connecting each output of the voltage to current converter to ground while disconnecting the other output of the voltage to current converter. In this embodiment, the ΣΔ modulator has no common mode control loop, and no reference current. This results in decreased complexity, i.e., fewer components, as well as reduced noise.

Described herein is a modulator with improved linearity in a quantized feedback loop, and specifically a method and an apparatus for reducing ISI in a single-bit [sigma][delta] modulator without reducing the dynamic range of the modulator. In one embodiment, the signal fed back to the input of the modulator is not the single-bit outputs of a quantizer as in the prior art, but rather patterns of such outputs. The patterns are selected so that each pattern has the same number of transition edges and there is thus no mismatch of transition times. In one embodiment, the patterns are created by digital logic. In another embodiment, an analog signal is added to the error signal in the feedback loop which causes the quantizer to generate the patterns. When the amplitude of the input signal exceeds a certain level, the modulator reverts to the typical operation of a prior art modulator, thus preserving the full dynamic range of the modulator.

The invention provides a control system quantizer in a wireless control device and a quantization feedback control method of the control system quantizer, relating to the technical field of the quantization feedback control of the wireless control device. The quantizer comprises a system state resolver, a signal A-D converter, an embedded microprocessor and a wireless communication circuit which are connected in sequence, wherein the system state resolver is used for acquiring a system state resolving amount based on a singular value of a system matrix; the signal A-D converter is used for carrying out digital conversion on the system state resolving amount; the embedded microprocessor is used for carrying out singular value resolving on the singular value of the system matrix, giving outan information rate optimal allocation strategy, calculating quantization parameters and carrying out quantization; and the wireless communication circuit is used for carrying out source encoding andchannel coding on a quantization value, transferring the quantization value to a system state estimator for valuation and inputting an estimated value into the controller so as to realize quantizationfeedback control. According to the control system quantizer, the quantization feedback control of the system can be realized, and the minimization of required information rate can be realized on thepremise that the control performance of the system is guaranteed.

The invention discloses a hybrid pre-coding method based on quantitative feedback of a channel statistic codebook. The method specifically comprises the following steps that: firstly, a base station determines a feedback bit number of analog pre-coding and valid channel information based on the information of a signal-to-noise ratio of a transmitted signal, an antenna number, a user number and system spectrum efficiency; a user estimates channel information between the base station and the user after receiving the feedback bit number; then the user designs a quantification analog pre-coding vector of the base station for the user and feeds back the quantification analog pre-coding vector to the base station, and the base station integrates the feedback into an analog pre-coding matrix, performs analog pre-coding and transmits a training sequence of a valid channel being subjected to the analog pre-coding; the user estimate a valid channel after receiving the training sequence, and performs quantification by using a codebook based on channel statistic; and lastly, the user feeds back quantified valid channel information to the base station, and the base station performs digital pre-programming according to the fed-back channel information. The hybrid pre-coding method can be effectively applied to actual scenes; errors of channel quantification can be reduced fully; and meanwhile the capacity performance of a system is improved.

Described herein is a method and apparatus for reducing ISI in a single-bit ΣΔ modulator without reducing the dynamic range of the modulator. In one embodiment, the signal fed back to the input of the modulator is not the single-bit outputs of a quantizer as in the prior art, but rather patterns of such outputs. The patterns are selected so that each pattern has the same number of transition edges and there is thus no mismatch of transition times. In one embodiment, the patterns are created by digital logic. In another embodiment, an analog signal is added to the error signal in the feedback loop which causes the quantizer to generate the patterns. When the amplitude of the input signal exceeds a certain level, the modulator reverts to the typical operation of a prior art modulator, thus preserving the full dynamic range of the modulator.

The invention discloses a method and device for quantizing feedback of channel information and data precoding. In the above method, a channel measurement pilot signal from a base station is received; channel measurement is performed according to the channel measurement pilot signal to obtain channel information; Calculate CMatrix1 and CMatrix2 using channel information, wherein CMatrix1 and CMatrix2 are used to quantize channel information or instruct the base station to perform precoding; feed back the first indication information of CMatrix1 and / or the second indication information of CMatrix2 to the base station. According to the technical solution provided by the present invention, since the influence of polarization leakage is considered in the feedback design, there is a significant performance gain when polarization leakage actually occurs.

The invention discloses an analog-to-digital conversion method for a pipelined ADC, and the method comprises the following steps: S100, carrying out the sampling and holding of an analog input signal through a sampling and holding circuit, and transmitting the analog input signal to a sub-ADC and a dynamic amplifier; s200, the sub-ADC quantizes the analog input signal and outputs a quantization result to an output register for latching; s300, after the dynamic amplifier amplifies the analog input signal, the analog input signal is transmitted to a residual error generation circuit; s400, the sub-DAC generates a quantization feedback signal according to the quantization result of the sub-ADC, and transmits the quantization feedback signal to the residual error generation circuit; s500, a residual error generation circuit subtracts the amplified analog input signal from the quantized feedback signal to obtain a residual error signal; and S600, the next stage of assembly line unit receives the residual error signal, and the steps S100 to S500 are repeated until the last stage of assembly line unit completes the action. According to the analog-to-digital conversion method of the pipelined ADC, the quantification process and the amplification process of the pipelined unit are decoupled, and the operation speed of the whole system is improved.

Provided in the present invention are a method and device for use in the transmission of codebook restriction signals and quantized feedback of channel information, the method for transmission of codebook restriction signals comprising: determining a codebook corresponding to different rank indicators (RIs) when channel information is fed back; dividing the codebook corresponding to different RIs into a predetermined number of groups according to the RIs, wherein the predetermined number is greater than or equal to 2; determining a codebook restriction mode corresponding to the codebook in the predetermined number of groups, wherein a first number of groups in the predetermined number of groups adopt a first codebook restriction mode, a second number of groups in the predetermined number of groups adopt a second codebook restriction mode, the first codebook restriction mode being different from the second codebook restriction mode; and transmitting codebook restriction signals according to the determined codebook restriction modes. The present invention solves the problem wherein in related technologies, the use of codebook restriction modes would result in sizable expenses, and reduces the resource expenses spent in restricting codebook.

The invention discloses a joint beam forming and power control method for interference of a 5G base station to satellite users, belongs to the technical field of satellite communication, and aims to solve the problem of same-frequency interference when satellite-5G integrated equipment is directly accessed to a network for spectrum sharing. The method comprises the following steps: constructing a satellite-5G integrated network model by adopting a beam forming technology, and obtaining an interference threshold of a satellite user; constructing a game model according to quantized feedback channel state information; introducing an adjustment step length, and obtaining optimal beam control power in combination with a beam forming vector; obtaining optimal transmitting power of a 5G base station according to a water injection power distribution principle; adopting a zero-forcing beam forming principle to obtain system capacities of 5G users based on different feedback rates; and introducing a cost function, and taking a Nash equilibrium condition of a game theory as a target to obtain a model of joint interference power control and feedback rate control. The invention is used for the communication of a satellite-5G integrated network.

The invention provides an image reconstruction method and device and electronic equipment, and the method comprises the steps: obtaining two-side neighbor projection data and two-side secondary neighbor projection data of a target pixel; based on the two-side neighbor projection data and the two-side secondary neighbor projection data, calculating target pixel projection data through a four-point self-adaptive resampling algorithm, wherein in the four-point self-adaptive resampling algorithm, the projection data are determined in a frequency domain through characteristics; performing image reconstruction based on the target pixel projection data; calculating target pixel projection data by adopting a four-point self-adaptive resampling algorithm based on the two-side neighbor projection data and the two-side secondary neighbor projection data. Moreover, the resampling algorithm is determined based on the quantitative feedback of the passing characteristics of the projection data in the frequency domain, the problem of inconsistent noise passing characteristics caused by interpolation can be solved, common annular noise form artifacts in 3D back projection are solved on the premise that the layer thickness and other image effective information are not changed, and the image quality is improved.

The invention discloses a robust security optimization design method for a wireless energy-carrying security communication system. The method comprises the steps that in a frequency division multiplexing system, edge computing equipment obtains channel estimation information through a rate-limited quantitative feedback link, and a channel quantization error of the edge computing equipment is usually in an ellipsoid model; under a norm bounded channel uncertainty model, edge-side main user equipment PT of an authorized frequency band is considered to transmit a secret signal to a main user receiving terminal PR, and illegal terminals respectively eavesdrop the secret signal; a secondary ST-SR link of an unlicensed frequency band shares the same frequency band with the edge-side main user equipment through spectrum adaptive sensing; and the ST-SR link realizes simultaneous transfer of energy and information through an energy-carrying communication mode. With the help of the ST-SR link, the security performance of the PT-PR link is improved. According to the invention, by optimizing the covariance matrix of the transmitted signal and the power division factor of the secondary user receiving terminal, the safety rate of the wireless energy-carrying edge computing communication system is improved.

The invention provides a low noise quantized feedback configuration. Described herein is an improved apparatus for increasing the performance of a [sigma][delta] modulator, which may function as an ADC. In one embodiment, the [sigma][delta] modulator comprises a voltage to current converter, a capacitor connected between two outputs of the voltage to current converter to receive a differential input current, and a switch that can switch between connecting each output of the voltage to current converter to ground while disconnecting the other output of the voltage to current converter. In thisembodiment, the [sigma][delta] modulator has no common mode control loop, and no reference current. This results in decreased complexity, i.e., fewer components, as well as reduced noise.