公开(公告)号：EP2016728A4

公开(公告)日：2014-04-23

申请号：EP07748373

申请日：2007-04-03

Applicant: ERICSSON TELEFON AB L M

Inventor： GUEY JIANN-CHING ,  HAFEEZ ABDULRAUF ,  HUI DENNIS

IPC: H04L25/02 ,  H04L27/26

CPC classification number: H04L25/0212 ,  H04L25/022 ,  H04L25/0222 ,  H04L27/2647

Abstract: A wireless communication device uses a time-invariant delay-Doppler channel response estimate for received signal demodulation. The device provides coherent signal demodulation by accounting for frequency and time selectivity in a land-based mobile communication environment, which arise mainly because of delay and Doppler shifts, respectively. In one embodiment, the wireless communication device includes a channel estimator that estimates channel response in a wireless communication network by estimating a delay-Doppler response of a wireless communication channel to obtain a delay-Doppler channel response estimate and converting the delay-Doppler channel response estimate to a time-varying channel response estimate, e.g., a time-varying frequency or impulse response. The delay-Doppler response may be estimated in a continuous or discrete domain. In one embodiment, the channel estimator includes a delay-Doppler correlator that measures the delay-Doppler response by observing a response of a wireless communication channel to a pilot signal and converting the observed response to a delay-Doppler domain.

公开(公告)号：EP2534867A4

公开(公告)日：2016-06-22

申请号：EP10845910

申请日：2010-02-11

Applicant: ERICSSON TELEFON AB L M

Inventor： HU YANG ,  GAN JIANSONG ,  HAFEEZ ABDULRAUF

IPC: H04W64/00 ,  G01S5/04 ,  H04W24/02

CPC classification number: H04W24/02 ,  G01S5/04 ,  H04W64/006

Abstract: Method and arrangement in a first base station for calculating a first location parameter α of a user equipment in order to improve beamforming accuracy. The first base station and the user equipment are comprised in a Coordinated Multiple Point “CoMP” communication system together with a second base station. The method comprises measuring a signal received from the user equipment, estimating a first parameter value α′ based on the measured signal, obtaining a second parameter value α″, based on an estimated second location parameter &bgr; of the user equipment, estimated at the second base station and calculating the first location parameter α, based on the first estimated parameter value α′ and the obtained second parameter value α″.

公开(公告)号：EP2115904A4

公开(公告)日：2016-05-18

申请号：EP07709490

申请日：2007-02-20

Applicant: ERICSSON TELEFON AB L M

Inventor： HAFEEZ ABDULRAUF ,  GUEY JIANN-CHING

IPC: H04B1/7075 ,  H04L27/26

CPC classification number: H04B1/7083 ,  H04B1/7077 ,  H04B2201/70702 ,  H04L27/2613 ,  H04L27/2659 ,  H04L27/266 ,  H04L27/2662

Abstract: A method of synchronizing signals in a wireless network uses a two part preamble transmitted on the downlink between a base station and a mobile station. The preamble includes a common pilot common to a plurality of base stations and a dedicated pilot unique to the transmitting base station. The mobile station performs coarse synchronization based on the common pilot and fine synchronization based on the dedicated pilot. The mobile station also identifies one or more nearby cells based on unique pilot tones in the dedicated pilot transmitted by the nearby cells.

公开(公告)号：EP1958347A4

公开(公告)日：2013-06-19

申请号：EP06824606

申请日：2006-12-05

Applicant: ERICSSON TELEFON AB L M

Inventor： HAFEEZ ABDULRAUF

IPC: H04B7/04 ,  H04B7/06

CPC classification number: H04B7/0697 ,  H04B7/0634 ,  H04B7/0691

公开(公告)号：EP1829308A4

公开(公告)日：2013-02-27

申请号：EP05789459

申请日：2005-09-26

Applicant: ERICSSON TELEFON AB L M

Inventor： HAFEEZ ABDULRAUF

IPC: H04L25/03 ,  H04L25/02

CPC classification number: H04L25/03229 ,  H04L25/0224 ,  H04L25/03292

公开(公告)号：WO2011077320A3

公开(公告)日：2012-03-01

申请号：PCT/IB2010055823

申请日：2010-12-15

Applicant: ERICSSON TELEFON AB L M ,  HAFEEZ ABDULRAUF

Inventor： HAFEEZ ABDULRAUF

IPC: H04B7/02 ,  H04B7/04 ,  H04B7/06

CPC classification number: H04B7/0452 ,  H04B7/024 ,  H04B7/0617 ,  H04W72/082

Abstract: In a communication system transmitting from multiple antennas to multiple users, data transmission rates are allocated over scheduled users by varying the weights assigned to the users. The user weights determine the transmission preceding vectors used for the transmissions, which determine the data rates. In one embodiment, a set of predetermined weights is selected from a plurality of sets of weights as the one maximizing the sum, over all scheduled users, of the ratio of each user's instantaneous data rate to the average rale over prior frames. In another embodiment, the weights, preceding vectors, and data rates are frequency-specific. In another embodiment, the user weights arc determined through an iterative process of assigning initial weights, determining the precoding vectors associated with the weights, determining the channel conditions for transmission using the determined preceding vectors, and adjusting the user weights based on their relative channel conditions.

Abstract translation: 在从多个天线发送到多个用户的通信系统中，通过改变分配给用户的权重，通过调度的用户分配数据传输速率。 用户权重确定用于确定数据速率的用于传输的先前向量的传输。 在一个实施例中，从多个权重集合中选择一组预定权重，作为在所有调度用户上将每个用户的瞬时数据速率与先前帧之间的平均rale的比率最大化的权重集合。 在另一个实施例中，权重，前向量和数据速率是频率特定的。 在另一个实施例中，通过分配初始权重的迭代过程确定用户权重，确定与权重相关联的预编码向量，使用所确定的先前向量确定用于传输的信道条件，以及基于它们的相对信道条件来调整用户权重 。

公开(公告)号：WO2008140387A3

公开(公告)日：2009-01-08

申请号：PCT/SE2008050377

申请日：2008-04-02

Applicant: ERICSSON TELEFON AB L M

Inventor： HAFEEZ ABDULRAUF ,  CHEN DAYONG ,  HUI DENNIS

IPC: H04L1/18

CPC classification number: H04L1/1845 ,  H04L1/1812

Abstract: In a wireless communication network using point-to-point or point-to-multipoint communications, this disclosure teaches the use of combined packets for retransmission and corresponding soft value processing at a receiver, wherein combined packets are formed as the logical combination of two or more previously transmitted packets and allow the receiver to use a single combined packet to correct one or more failed packets. For example, with the combined packet retransmission and corresponding soft value receiver processing as taught herein, a given receiver can use a given combined packet to correct bit errors in all (failed) packets comprising the combined packet as long as the bit errors in a failed packet do not overlap (or align) with bit errors in the other failed packets comprising the combined packet.

Abstract translation: 在使用点对点或点对多点通信的无线通信网络中，本公开教导了在接收机处使用组合分组进行重传和对应的软值处理，其中组合分组被形成为两个或 更先前传输的分组，并允许接收机使用单个组合分组来校正一个或多个故障分组。 例如，通过组合的分组重传和如本文所教导的相应的软值接收器处理，给定的接收机可以使用给定的组合分组来校正包括组合分组的所有（失败的）分组中的比特错误，只要失败的比特错误 分组不与包括组合分组的其他故障分组中的比特错误重叠（或对齐）。

公开(公告)号：WO2007133156A3

公开(公告)日：2008-02-14

申请号：PCT/SE2007050212

申请日：2007-04-03

Applicant: ERICSSON TELEFON AB L M

Inventor： GUEY JIANN-CHING ,  HAFEEZ ABDULRAUF ,  HUI DENNIS

IPC: H04L25/02 ,  H04L27/26

CPC classification number: H04L25/0212 ,  H04L25/022 ,  H04L25/0222 ,  H04L27/2647

Abstract: A wireless communication device uses a time-invariant delay-Doppler channel response estimate for received signal demodulation. The device provides coherent signal demodulation by accounting for frequency and time selectivity in a land-based mobile communication environment, which arise mainly because of delay and Doppler shifts, respectively. In one embodiment, the wireless communication device includes a channel estimator that estimates channel response in a wireless communication network by estimating a delay-Doppler response of a wireless communication channel to obtain a delay-Doppler channel response estimate and converting the delay-Doppler channel response estimate to a time-varying channel response estimate, e.g., a time-varying frequency or impulse response. The delay-Doppler response may be estimated in a continuous or discrete domain. In one embodiment, the channel estimator includes a delay-Doppler correlator that measures the delay-Doppler response by observing a response of a wireless communication channel to a pilot signal and converting the observed response to a delay-Doppler domain.

Abstract translation: 无线通信设备使用用于接收信号解调的时不变延迟多普勒信道响应估计。 该装置通过考虑在陆基移动通信环境中的频率和时间选择性来提供相干信号解调，这主要是由于延迟和多普勒频移引起的。 在一个实施例中，无线通信设备包括通过估计无线通信信道的延迟多普勒响应来估计无线通信网络中的信道响应的信道估计器，以获得延迟多普勒信道响应估计并转换延迟多普勒信道响应 估计到时变信道响应估计，例如时变频率或脉冲响应。 可以在连续或离散的域中估计延迟多普勒响应。 在一个实施例中，信道估计器包括延迟多普勒相关器，其通过观察无线通信信道对导频信号的响应并将观测到的响应转换为延迟多普勒域来测量延迟多普勒响应。

公开(公告)号：WO2007067137A2

公开(公告)日：2007-06-14

申请号：PCT/SE2006050539

申请日：2006-12-05

Applicant: ERICSSON TELEFON AB L M

Inventor： HAFEEZ ABDULRAUF

IPC: H04B7/04

CPC classification number: H04B7/0697 ,  H04B7/0634 ,  H04B7/0691

Abstract: A system and method for transmitting multiple independent data streams from subsets of a plurality of transmit antennas. The method includes determining (11 ) by a receiver (50), a transmit antenna partitioning, including relative phase rotations to be applied to each transmit antenna, that results in the highest channel capacity among the possible partitionings. The receiver (50) then provides (12) partitioning information to a transmitter (40), including the number of transmit antenna subsets, which transmit antennas are included in each subset, the capacity of the data stream to be transmitted from each antenna subset, and the relative phase rotations to be applied to the antennas in each subset. The transmitter (40) partitions (35) the plurality of transmit antennas into mutually exclusive subsets in accordance with the partitioning information, applies (38) the relative phase rotation to each transmit antenna, and transmits (39) an independent data stream from each subset of transmit antennas with a rate not greater than the stream capacity.

Abstract translation: 一种用于从多个发射天线的子集发射多个独立数据流的系统和方法。 该方法包括由接收机（50）确定（11）包括将被应用于每个发射天线的相对相位旋转的发射天线分割，其导致可能分割中的最高信道容量。 然后接收机（50）向发射机（40）提供（12）分区信息，包括发射天线子集的数量，发射天线包括在每个子集中，要从每个天线子集发射的数据流的容量， 以及要应用于每个子集中的天线的相对相位旋转。 发射机（40）根据划分信息将多个发射天线划分（35）为互斥子集，向每个发射天线施加（38）相对相位旋转，并且从每个子集发射（39）独立数据流 的传输天线的速率不大于流的容量。

公开(公告)号：MX2009007314A

公开(公告)日：2009-07-15

申请号：MX2009007314

申请日：2007-02-20

Applicant: ERICSSON TELEFON AB L M

Inventor： HAFEEZ ABDULRAUF ,  GUEY JIANN-CHING

IPC: H04B7/00

Abstract: Un método para sincronizar señales en una red inalámbrica utiliza un preámbulo en dos partes transmitido en el enlace descendente entre una estación de base y una estación móvil. El preámbulo incluye un piloto común a una pluralidad de estaciones base y un piloto dedicado único a la estación de base de transmisión. La estación móvil lleva a cabo la sincronización gruesa basada en el piloto común y la sincronización fina basada en el piloto dedicado. La estación móvil también identifica una o más celdas circundantes basada en todos piloto únicos en el piloto dedicado transmitido por las celdas circundantes.