公开(公告)号：US20120002743A1

公开(公告)日：2012-01-05

申请号：US13018737

申请日：2011-02-01

Applicant: Charles Casimiro Cavalcante ,  Alisson Guimarães ,  Tarcísío Ferreira Maciel ,  Ligia Sousa

Inventor： Charles Casimiro Cavalcante ,  Alisson Guimarães ,  Tarcísío Ferreira Maciel ,  Ligia Sousa

IPC: H04B7/02

CPC classification number: H04B7/024 ,  H04B7/0417 ,  H04B7/0452 ,  H04B7/0465 ,  H04B7/0626 ,  H04L25/0242 ,  H04L25/03343 ,  H04L27/2647 ,  H04W52/143 ,  H04W52/40

Abstract: A network node jointly precodes multi-user (MU) multiple-input multiple-output (MIMO) transmissions simultaneously sent from geographically distributed base stations to a plurality of mobile terminals over associated downlink MU-MIMO channels. The node receives feedback that describes statistics of the downlink MU-MIMO channels, including channel mean and covariance. The node then computes, based on the channel means and covariances, uplink input covariances for the mobile terminals that would collectively maximize a first or second-order approximation of the ergodic capacity of dual uplink MU-MIMO channels, subject to a global transmit power constraint that comprises the sum of individual transmit power constraints for the base stations. Notably, the node also adjusts the uplink input covariances as needed to satisfy the individual transmit power constraints for the base stations, maps the uplink input covariances to corresponding downlink input covariances, and jointly precodes MU-MIMO transmissions sent over the downlink MU-MIMO channels based on those downlink input covariances.

Abstract translation: 网络节点将通过相关联的下行链路MU-MIMO信道从地理分布的基站同时发送的多用户（MU）多输入多输出（MIMO）传输共同预编码到多个移动终端。 节点接收到描述下行MU-MIMO信道的统计信息的反馈，包括信道均值和协方差。 然后，该节点基于信道装置和协方差来计算移动终端的上行链路输入协方差，该协方差将统一地最大化双上行链路MU-MIMO信道的遍历容量的一阶或二阶近似，受到全局发射功率约束 其包括基站的各个发射功率约束的总和。 值得注意的是，节点还根据需要调整上行链路输入协方差，以满足基站的各个发射功率约束，将上行链路输入协方差映射到相应的下行链路输入协方差，并联合预编码在下行链路MU-MIMO信道上发送的MU-MIMO传输 基于这些下行链路输入协方差。

公开(公告)号：US08934557B2

公开(公告)日：2015-01-13

申请号：US13018737

申请日：2011-02-01

Applicant: Charles Casimiro Cavalcante ,  Alisson Guimarães ,  Tarcísío Ferreira Maciel ,  Lĩgia Sousa

Inventor： Charles Casimiro Cavalcante ,  Alisson Guimarães ,  Tarcísío Ferreira Maciel ,  Lĩgia Sousa

IPC: H04B7/02 ,  H04L1/02 ,  H04B7/04 ,  H04B7/06 ,  H04L25/02 ,  H04L25/03 ,  H04L27/26 ,  H04W52/14 ,  H04W52/40

CPC classification number: H04B7/024 ,  H04B7/0417 ,  H04B7/0452 ,  H04B7/0465 ,  H04B7/0626 ,  H04L25/0242 ,  H04L25/03343 ,  H04L27/2647 ,  H04W52/143 ,  H04W52/40

Abstract: A network node jointly precodes multi-user (MU) multiple-input multiple-output (MIMO) transmissions simultaneously sent from geographically distributed base stations to a plurality of mobile terminals over associated downlink MU-MIMO channels. The node receives feedback that describes statistics of the downlink MU-MIMO channels, including channel mean and covariance. The node then computes, based on the channel means and covariances, uplink input covariances for the mobile terminals that would collectively maximize a first or second-order approximation of the ergodic capacity of dual uplink MU-MIMO channels, subject to a global transmit power constraint that comprises the sum of individual transmit power constraints for the base stations. Notably, the node adjusts the uplink input covariances as needed to satisfy the individual transmit power constraints for the base stations, maps the uplink input covariances to corresponding downlink input covariances, and jointly precodes MU-MIMO transmissions sent over the downlink MU-MIMO channels based on those downlink input covariances.

Abstract translation: 网络节点将通过相关联的下行链路MU-MIMO信道从地理分布的基站同时发送的多用户（MU）多输入多输出（MIMO）传输共同预编码到多个移动终端。 节点接收到描述下行MU-MIMO信道的统计信息的反馈，包括信道均值和协方差。 然后，该节点基于信道装置和协方差来计算移动终端的上行链路输入协方差，该协方差将统一地最大化双上行链路MU-MIMO信道的遍历容量的一阶或二阶近似，受到全局发射功率约束 其包括基站的各个发射功率约束的总和。 值得注意的是，节点根据需要调整上行链路输入协方差，以满足基站的各个发射功率约束，将上行链路输入协方差映射到相应的下行链路输入协方差，并联合预编码通过下行链路MU-MIMO信道发送的MU-MIMO传输 在这些下行链路输入协方差上。

公开(公告)号：US20110064035A1

公开(公告)日：2011-03-17

申请号：US12634250

申请日：2009-12-09

Applicant: Igor Moáco Guerreiro ,  Charles Casimiro Cavalcante ,  Darlan Cavalcante Moreira ,  Dennis Hui ,  Icaro L. Silva

Inventor： Igor Moáco Guerreiro ,  Charles Casimiro Cavalcante ,  Darlan Cavalcante Moreira ,  Dennis Hui ,  Icaro L. Silva

IPC: H04B15/00 ,  H04W72/00

CPC classification number: H04B1/1027 ,  H04B7/0434 ,  H04B7/0626 ,  H04B7/0639 ,  H04B17/345

Abstract: According to the teachings presented herein, each base station in a group of base stations is linked to an associated terminal as a receiver-transmitter pair. These receiver-transmitter pairs reuse channelization resources, such that each terminal represents a source of other-cell interference (also referred to as multi-user interference or MUI) for other terminals in neighboring cells that are reusing all or some of the same channelization resources. Accordingly, the base stations implement a gaming-based algorithm to mitigate MUI for the multiple-input-multiple-output (MIMO) uplink signals received from their associated terminals. More particularly, each base station functions as a player in a game, in which the allowed gaming action is the selection of the precoding matrix to be used for MIMO uplink transmissions to the base station from an associated terminal.

Abstract translation: 根据本文给出的教导，一组基站中的每个基站作为接收机 - 发射机对链接到相关联的终端。 这些接收机 - 发射机对重用信道化资源，使得每个终端表示对相邻小区中用于重用所有或一些相同信道化资源的相邻小区中的其他终端的其他小区干扰源（也称为多用户干扰或MUI） 。 因此，基站实施基于游戏的算法来减轻从其相关终端接收的多输入多输出（MIMO）上行链路信号的MUI。 更具体地，每个基站用作游戏中的玩家，其中允许的游戏动作是选择用于从相关联的终端到基站的MIMO上行链路传输的预编码矩阵。