Patent application number | Description | Published |
20100304776 | LONG-TERM-CSI-AIDED MU-MIMO SCHEDULING METHOD, BASE STATION AND USER EQUIPMENT - The present invention proposes a multiuser multi-input multi-output scheduling method, which comprises steps of: a multiuser scheduling step of performing multiuser scheduling by using mean channel matrixes of respective user equipments; and a multiuser precoding step of performing multiuser precoding by using instantaneous channel matrixes of respective user equipments selected in the multiuser scheduling. The present invention also proposes a base station and a user equipment which will be used to implement the inventive multiuser multi-input multi-output scheduling method. | 12-02-2010 |
20100306613 | METHOD OF MULTIUSER PRECODING AND SCHEDULING AND BASE STATION FOR IMPLEMENTING THE SAME - The present invention provides a method of multiuser precoding and scheduling, comprising: feeding channel state information (CSI) and statistic properties of CSI error back to a base station (BS) from a user equipment (UE); generating multiuser precoding matrix and scheduling scheme by the BS, according to the feedback CSI and the statistic properties of CSI error; and performing multiuser precoding and scheduling on user data by using the generated multiuser precoding matrix and scheduling scheme. | 12-02-2010 |
20110028156 | METHOD AND DEVICE FOR CONTROLLING THE COORDINATED TRANSMISSION FOR DOWNLINK SIGNALS IN A WIRELESS TELECOMMUNICATION NETWORK - A method and device for controlling the serving BS and at least one coordinating BS for coordinating downlink data communication with the MS in a wireless telecommunication network based on CO-MIMO technology. The method comprises obtaining the MIMO downlink channel information between the serving BS and the MS and between the coordinating BS and the MS, determining the downlink signal precoding information between the serving BS and the MS and between the coordinating BS and the MS according to the channel information, and performing MIMO downlink data communication coordinately with the MS based on the downlink signal precoding information. | 02-03-2011 |
20110142164 | METHOD AND DEVICE FOR REALIZING GROUPING IN MULTI-INPUT MULTI-OUTPUT TRANSMISSION WITH MULTIPLE-SECTOR COORDINATION - A method and device for performing Multi-Input Multi-Output transmission to a mobile terminal in the base station devices of a wireless communication system is provided. Each base station device determines the sector coordination group used at a certain frequency band according to system settings. Each base station device only performs multiple-sector (-cell) collaborative MIMO transmission in the sector coordination group which includes the sectors governed by the base station device. A simple and effective method is provided for realizing the multiple-sector (-cell) MIMO technology, its advantages including but not limited to there being a reduced amount of information exchanged between sectors (cells), which facilitates implementation and management, and good performance in controlling interface between sectors (cells). | 06-16-2011 |
20120014468 | METHOD AND APPARATUS FOR CONTROLLING CO-CHANNEL INTERFERENCE IN A WIRELESS COMMUNICATION SYSTEM - The present invention provides a method and an apparatus of controlling co-channel interference in a base station of a wireless communication system based on collaborative MIMO and the corresponding method and apparatus of assisting a serving base station to control co-channel interference in a mobile station of a wireless communication system based on collaborative MIMO. Since the feedback mechanism based on the codebook is employed in the collaborative MIMO system in the present invention to enable the BS to obtain the precoding information, the present invention can be used to the both TDD mode and FDD mode. Moreover, since the precoding vectors selected by the different mobile stations for a same BS are always orthogonal, multi-user co-channel interference can be reduced. | 01-19-2012 |
20120040702 | METHOD AND APPARATUS FOR SELECTING OBJECT TERMINAL IN A MULTI-BS MIMO SYSTEM - According to an embodiment of the present invention, on a radio resource block for Multi-BS MIMO, one of the coordinating base stations selects a mobile terminal at first, and informs the other base stations of the characterization information and the pre-coding information etc. of the selected mobile terminal, and the selection made by the other base stations will obey the selection result of the base station that selects at first. By applying the method and apparatus provided by the present invention, the joint selection of object terminals in the Multi-BS MIMO is realized, and such selection is distributed without any central scheduling device which is necessary in the central scheduling scheme. In addition, only very limited information exchange among the coordinating base stations is required to realize the present invention. According to an embodiment of the present invention, the object terminals selected by the coordinating base stations are matched well with each other such that the total performance of the system is improved; according to an embodiment of the present invention, the fairness among the base stations can be well satisfied. | 02-16-2012 |
20120099470 | METHOD AND APPARATUS FOR CHANNEL STATE INFORMATION FEEDBACK - Embodiments of the present invention provide a method and apparatus for channel state information feedback. The method comprises: estimating channel state information from the mobile terminal to a serving cell and neighboring cells according to channel state information reference signals (CSI-Reference Signal) received from a plurality of coordinating cells; calculating a precoding matrix based on the estimated channel state information of the serving cell; calculating precoded channel state information respectively for the serving cell of the mobile terminal and neighboring cells in the coordinating cells according to the obtained precoding matrix; and feeding the precoded channel state information back to the serving cell of the mobile terminal. The above technical scheme can implement flexible and efficient channel status information feedback with low overhead, and enable multi-cell coordinated transmission to perform flexible and efficient precoding processing based on the feedback. | 04-26-2012 |
20120147992 | METHOD AND APPARATUS FOR CONSTRUCTING CODEBOOK, AND METHOD, APPARATUS AND SYSTEM FOR PRECODING - The present invention discloses a method and apparatus for constructing a codebook. The method comprises: receiving grouping information on a plurality of transmit antennas of a base station: obtaining a channel model for a channel between a mobile terminal and the base station; and determining an optimal precoding matrix corresponding to each antenna group according to the grouping information and the channel model, so as to construct a codebook used for precoding. The present invention further discloses a method and apparatus for selecting a precoding matrix, as well as a method, apparatus and system for precoding. | 06-14-2012 |
20120275531 | METHOD AND DEVICE FOR SELECTING THE ANTENNAS AT THE BASE STATION - In order to solve the technical problem in the prior art that different spatial correlation modes are applicable for the transmission antennas in the base station under different working modes is not considered, the present invention provides a method and device for selecting the antenna at the base station. Wherein, the spatial correlation mode information among the multiple transmission antenna elements is determined by the base station according to the working mode; then, multiple transmission antenna elements are selected from several antenna elements to transmit the signal, according to the spatial correlation mode information. With the solution in the present invention, the base station may flexibly choose channel characteristic of strong spatial correlation and/or high DoF. When the base station is working under a closed-loop mode, transmission antennas may be selected to satisfy the strong spatial correlation, thereby the feedback over-head is reduced, and the robustness against the feedback delay is increased, and the quantization error is reduced. When the base station is working under an open-loop mode, transmission antennas may be selected to satisfy the weak spatial correlation, thereby the spatial DoF is increased, and the diversity and/or multi-plexing gain is introduced. | 11-01-2012 |
20130289942 | METHOD AND APPARATUS FOR MEASURING AND RECOVERING SPARSE SIGNALS - The invention provides two kinds of new compressive sensing technologies. In the first technical solution, there is proposed a permutation-based multi-dimensional sensing matrix and an iterative recovery algorithm with maximum likelihood (ML) local detection, which can fully exploit the digital nature of sparse signals. In the second technical solution, there is proposed a sparse measurement matrix which contains a permutation-based multi-dimensional measurement matrix, and an iterative recovery algorithm which fully utilizes the features of measurement symbols to design simple local recovery in each iteration. The second technical solution can achieve the linear decoding complexity and lower bound of sketch length empirically at the same time. | 10-31-2013 |
20140241452 | METHOD AND APPARATUS FOR CONSTRUCTING CODEBOOK, AND METHOD, APPARATUS AND SYSTEM FOR PRECODING - The present invention discloses a method and apparatus for constructing a codebook. The method comprises: receiving grouping information on a plurality of transmit antennas of a base station; obtaining a channel model for a channel between a mobile terminal and the base station; and determining an optimal precoding matrix corresponding to each antenna group according to the grouping information and the channel model, so as to construct a codebook used for precoding. The present invention further discloses a method and apparatus for selecting a precoding matrix, as well as a method, apparatus and system for precoding. | 08-28-2014 |
20150049836 | METHOD AND APPARATUS FOR FILTER BANK MULTI-CARRIER SIGNAL TRANSMISSION AND CHANNEL ESTIMATION - The present invention provides a method for transmitting signals in a transmitter of a filter band multi-carrier system, comprising steps of: modulating data to obtain modulated data; obtaining a to-be-transmitted signal by framing a pilot preamble symbol with the modulated data; transmitting the to-be-transmitted signal; the pilot preamble symbol consisting of preamble elements, wherein the pilot preamble symbol corresponding to each transmit antenna occupies one filter band multi-carrier modulation symbol. The present invention further provides an apparatus for implementing the method, and a method and apparatus for channel estimation corresponding to the method for transmitting signals. | 02-19-2015 |