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    ADAPTIVE PILOT SYMBOL ALLOCATION METHOD AND APPARATUS
    5.
    发明申请
    ADAPTIVE PILOT SYMBOL ALLOCATION METHOD AND APPARATUS 审中-公开
    自适应引导符号分配方法和装置

    公开(公告)号：WO2008108710A3

    公开(公告)日：2008-10-30

    申请号：PCT/SE2008000183

    申请日：2008-03-07

    Applicant: ERICSSON TELEFON AB L M

    Inventor： GUEY JIANN-CHING ,  OSSEIRAN AFIF

    IPC: H04L27/26 ,  H04L25/02

    CPC classification number: H04L5/0007 ,  H04L5/0048 ,  H04L5/005 ,  H04L5/0051 ,  H04L5/0064 ,  H04L25/022 ,  H04L25/0224 ,  H04L25/025 ,  H04L27/2613

    Abstract: According to one embodiment, a wireless communication device estimates channel response based on a reduced-density common pilot signal comprising a plurality of regularly spaced common pilot symbols when the reduced-density common pilot signal is sufficient for estimating the channel response with a desired accuracy (302, 304). The wireless communication device estimates the channel response based on the reduced-density common pilot signal and one or more additional pilot symbols adaptively allocated to the wireless communication device when the reduced-density common pilot signal is insufficient for estimating the channel response with the desired accuracy (308).

    Abstract translation: 根据一个实施例，当减密密度公共导频信号足以以期望的精度估计信道响应时，无线通信设备基于包括多个规则间隔的公共导频符号的简化密度公共导频信号来估计信道响应（ 302,304）。 当减密密度公共导频信号不足以以期望的精度估计信道响应时，无线通信设备基于减小密度公共导频信号和自适应分配给无线通信设备的一个或多个附加导频符号来估计信道响应 （308）。

    A COMMUNICATION UNIT AND A METHOD IN A WIRELESS COMMUNICATION NETWORK
    6.
    发明申请
    A COMMUNICATION UNIT AND A METHOD IN A WIRELESS COMMUNICATION NETWORK 审中-公开
    一种通信单元和无线通信网络中的一种方法

    公开(公告)号：WO2009110835A3

    公开(公告)日：2010-03-18

    申请号：PCT/SE2009050061

    申请日：2009-01-21

    Applicant: ERICSSON TELEFON AB L M ,  MIAO QINGYU ,  ZHANG ZHANG ,  HU RONG ,  OSSEIRAN AFIF ,  GAN JIANSONG

    Inventor： MIAO QINGYU ,  ZHANG ZHANG ,  HU RONG ,  OSSEIRAN AFIF ,  GAN JIANSONG

    IPC: H04L12/56

    CPC classification number: H04W40/02 ,  H04L45/22

    Abstract: A communication unit for use in a wireless communication system in which a transmitting unit is arranged for wireless communication with at least one receiving unit, said network further comprising at least a first and a second relay node arranged to receive a signal from the transmitting unit and forward it to the receiving unit, said node being characterized in that it comprises a processor arranged to perform the following steps: identifying at least a first and a second communication path between the transmitting unit and the receiving unit, at least one of said paths involving the first or the second relay node, calculating a first and a second capacity of at least one hop in the first and second communication path, respectively communicating information related to the first and second capacity to at least one other communication node in the wireless network.

    Abstract translation: 一种在无线通信系统中使用的通信单元，其中发送单元被布置用于与至少一个接收单元的无线通信，所述网络还包括至少第一和第二中继节点，被布置为从所述发送单元接收信号， 所述节点的特征在于，其包括被配置为执行以下步骤的处理器：识别所述发送单元和所述接收单元之间的至少第一和第二通信路径，所述至少一个所述路径涉及 第一或第二中继节点，计算第一和第二通信路径中的至少一跳的第一和第二容量，分别将与第一和第二容量相关的信息传送到无线网络中的至少一个其他通信节点。

    MIMO SCHEME SELECTION BASED ON USER TERMINAL VELOCITY
    7.
    发明申请
    MIMO SCHEME SELECTION BASED ON USER TERMINAL VELOCITY 审中-公开
    基于用户终端速度的MIMO方案选择

    公开(公告)号：WO2009038509A8

    公开(公告)日：2009-05-07

    申请号：PCT/SE2007050669

    申请日：2007-09-20

    Applicant: ERICSSON TELEFON AB L M ,  OSSEIRAN AFIF ,  OLSSON MAGNUS A

    Inventor： OSSEIRAN AFIF ,  OLSSON MAGNUS A

    IPC: H04B7/06 ,  G01S11/10

    CPC classification number: H04B7/0417 ,  H04B7/0452 ,  H04B7/063 ,  H04B7/0689

    Abstract: A method, radio network node, adapting device, and base station for selecting a spatial transmission scheme to be used for multiple input multiple output (MIMO) transmissions to a mobile terminal in a telecommunications system based on a current velocity of said terminal is described. The method comprises deriving a transmission scheme indicator via a mobile terminal link and selecting one scheme from a prestored set of transmission schemes based on the indicator. Thereby a more optimal selection of the spatial transmission scheme may be accomplished for each user, something which enhances the user experience and also significantly improves the throughput/capacity and spectral efficiency of the system.

    Abstract translation: 描述了用于基于所述终端的当前速度来选择要用于到电信系统中的移动终端的多输入多输出（MIMO）传输的空间传输方案的方法，无线电网络节点，适配设备和基站。 该方法包括经由移动终端链路导出传输方案指示符并且基于该指示符从预先存储的一组传输方案中选择一个方案。 由此可以为每个用户实现空间传输方案的更优选择，这增强了用户体验，并且还显着提高了系统的吞吐量/容量和频谱效率。

    TIME AND FREQUENCY CHANNEL ESTIMATION IN AN OFDM SYSTEM
    8.
    发明申请
    TIME AND FREQUENCY CHANNEL ESTIMATION IN AN OFDM SYSTEM 审中-公开
    OFDM系统中的时间和频率信道估计

    公开(公告)号：WO2006132589A3

    公开(公告)日：2007-02-01

    申请号：PCT/SE2006050133

    申请日：2006-05-17

    Applicant: ERICSSON TELEFON AB L M

    Inventor： OSSEIRAN AFIF ,  LOGOTHETIS ANDREW

    IPC: H04L25/02 ,  H04J11/00 ,  H04L27/26

    CPC classification number: H04L25/0242 ,  H04L1/0625 ,  H04L5/0023 ,  H04L5/0048 ,  H04L25/0224 ,  H04L25/0226 ,  H04L25/0232 ,  H04L25/025

    Abstract: A radio channel estimation technique is described for use in a OFDM-based radio communications system. A block of OFDM symbols is transmitted from multiple antennas over multiple sub-carrier frequencies. The block of OFDM symbols includes known pilot symbols as well as data symbols to be determined by a receiver. The pilot symbols are transmitted in a predetermined pattern at periodic times on periodic sub-carriers. A pilot channel estimate is determined for each pilot symbol in the received block of OFDM symbols. An NxM matrix of points corresponding to the received OFDM symbol block is formed, N is the number of sub-carriers and M is the number of OFDM symbols in the OFDM symbol block. The matrix is formed by inserting pilot channel estimates at predetermined positions in the Nx M matrix according to the predetermined pilot pattern and inserting zeros in remaining positions in the NxM matrix. A two dimensional inverse Fourier transform of the N x M matrix is calculated resulting in multiple copies of a channel estimate in the time domain. One is selected, and a two dimensional Fourier transform of the selected channel estimate is calculated to obtain a channel estimate at each point in the OFDM block.

    Abstract translation: 描述了用于基于OFDM的无线电通信系统中的无线电信道估计技术。 OFDM符号块通过多个子载波频率从多个天线发送。 OFDM符号的块包括已知的导频符号以及由接收机确定的数据符号。 在周期性子载波上周期性地以预定模式发送导频符号。 对OFDM符号的接收块中的每个导频符号确定导频信道估计。 形成与所接收的OFDM符号块对应的点的N×M矩阵，N是子载波的数量，M是OFDM符号块中的OFDM符号的数量。 通过根据预定导频模式在N×M矩阵中的预定位置插入导频信道估计并将零插入N×M矩阵中的剩余位置来形成矩阵。 计算N×M矩阵的二维傅里叶逆变换，得到时域中的信道估计的多个拷贝。 选择一个，并且计算所选择的信道估计的二维傅里叶变换，以在OFDM块中的每个点处获得信道估计。

    9.
    发明专利
    未知

    公开(公告)号：BRPI0709240A2

    公开(公告)日：2011-06-28

    申请号：BRPI0709240

    申请日：2007-03-29

    Applicant: ERICSSON TELEFON AB L M

    Inventor： OSSEIRAN AFIF ,  LOGOTHETIS ANDREW

    IPC: H04L27/26 ,  H04B7/02 ,  H04B7/208

    Abstract: A wireless communication system uses relaying to enhance performance. Artificial frequency selectivity and spatial diversity are provided by introducing delay diversity. A transformed OFDM chunk is subjected to a 2D cyclic prefix by pre-appending to a representation of the chunk the last column of the representation and by copying a number of the last rows of the pre-appended chunk to the top of the representation thereby forming an augmented OFDM chunk.

    10.
    发明专利
    未知

    公开(公告)号：AT428229T

    公开(公告)日：2009-04-15

    申请号：AT04775325

    申请日：2004-08-20

    Applicant: ERICSSON TELEFON AB L M

    Inventor： OSSEIRAN AFIF ,  LOGOTHETIS ANDREW ,  ERICSON MARTEN

    IPC: H04B7/06 ,  H04B7/04 ,  H04L12/56 ,  H04W16/28 ,  H04W72/08 ,  H04W72/12

    Abstract: A radio base station includes multiple antennas associated with a cell. Multiple mobile radios are selected to receive transmissions over a shared radio channel during a predetermined time interval. Information is transmitted over the shared radio channel to multiple mobile radios in the cell during the predetermined time interval using multiple antenna beams. As a result, interference from the transmission appears as white additive Gaussian noise in time and in space in the cell. A "flashlight effect" caused by a single beam transmission over the shared channel during a predetermined time interval that would normally detrimentally impact mobile channel quality detection is avoided. Other methods for avoiding the flashlight effect are described.

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