公开(公告)号：US08243658B2

公开(公告)日：2012-08-14

申请号：US13289826

申请日：2011-11-04

申请人： Kambiz Zangi

发明人： Kambiz Zangi

IPC分类号： H04W4/00

CPC分类号： H04L25/03343 ,  H04L25/0206 ,  H04L2025/03426

摘要： Techniques for reducing the number of bits needed to specify the best precoding vector for each mobile station in a wireless communication network that employs multi-point transmission are disclosed. An exemplary method begins with the estimation of path loss between a mobile station and each of a plurality of geographically separated transmitter sites, each transmitter site having at least one transmitter antenna. Based on the estimated path losses, one of a plurality of pre-determined subsets (codebooks) of a pre-determined set of antenna precoding vectors is selected. A group index identifying the selected subset is then transmitted to the mobile station. Subsequently, a vector index is received from the mobile station, the vector index corresponding to a precoding vector in the selected subset, and data is transmitted to the mobile station, using the precoding vector applied to the transmitter antennas at the plurality of transmitter sites.

摘要翻译： 公开了用于减少在采用多点传输的无线通信网络中为每个移动台指定最佳预编码矢量所需的比特数量的技术。 一种示例性方法开始于估计移动站与多个地理上分离的发射机站点中的每一个之间的路径损耗，每个发射机站点具有至少一个发射机天线。 基于估计的路径损耗，选择预定的天线预编码矢量集合的多个预定子集（码本）之一。 识别所选子集的组索引然后被发送到移动台。 随后，从移动台接收向量索引，对应于所选子集中的预编码向量的向量索引，并且使用应用于多个发射机站点处的发射机天线的预编码矢量将数据发送到移动台。

公开(公告)号：US20120170542A1

公开(公告)日：2012-07-05

申请号：US13421403

申请日：2012-03-15

申请人： Kambiz Zangi

发明人： Kambiz Zangi

IPC分类号： H04W72/04 ,  H04J11/00

CPC分类号： H04L5/0048 ,  H04L5/0007 ,  H04L5/006

摘要： A mobile communication system network node (NN) that serves user equipments (UEs) has fewer orthogonal reference signals (RSs) than a maximum number of UE antenna ports (APs) that can be served by the NN. A channel quality of a channel between the AP and the network node is ascertained for each of the APs. Whenever a number of APs of UEs served by the NN exceeds the number of RSs, all RSs are allocated to a subset of all of the APs by means of an allocation process such that: each RS is allocated to only one of the APs; each AP has no more than one RS allocated to it; and allocation decisions are a function of the channel qualities of the respective APs such that the higher the channel quality, the higher priority the corresponding AP is given as a candidate for receiving an RS allocation.

摘要翻译： 为用户设备（UE）提供的移动通信系统网络节点（NN）具有比可由NN服务的最大数量的UE天线端口（AP）更少的正交参考信号（RS）。 确定每个AP的AP和网络节点之间的信道的信道质量。 每当由NN服务的UE的多个AP超过RS的数量时，通过分配处理将所有RS分配给所有AP的子集，使得：每个RS仅分配给一个AP; 每个AP只有一个RS分配给它; 并且分配决定是各个AP的信道质量的函数，使得信道质量越高，相应的AP的较高优先级被给予作为用于接收RS分配的候选。

公开(公告)号：US20120051450A1

公开(公告)日：2012-03-01

申请号：US13289826

申请日：2011-11-04

申请人： Kambiz Zangi

发明人： Kambiz Zangi

IPC分类号： H04B15/00

CPC分类号： H04L25/03343 ,  H04L25/0206 ,  H04L2025/03426

摘要： Techniques for reducing the number of bits needed to specify the best precoding vector for each mobile station in a wireless communication network that employs multi-point transmission are disclosed. An exemplary method begins with the estimation of path loss between a mobile station and each of a plurality of geographically separated transmitter sites, each transmitter site having at least one transmitter antenna. Based on the estimated path losses, one of a plurality of pre-determined subsets (codebooks) of a pre-determined set of antenna precoding vectors is selected. A group index identifying the selected subset is then transmitted to the mobile station. Subsequently, a vector index is received from the mobile station, the vector index corresponding to a precoding vector in the selected subset, and data is transmitted to the mobile station, using the precoding vector applied to the transmitter antennas at the plurality of transmitter sites.

摘要翻译： 公开了用于减少在采用多点传输的无线通信网络中为每个移动台指定最佳预编码矢量所需的比特数量的技术。 一种示例性方法开始于估计移动站与多个地理上分离的发射机站点中的每一个之间的路径损耗，每个发射机站点具有至少一个发射机天线。 基于估计的路径损耗，选择预定的天线预编码矢量集合的多个预定子集（码本）之一。 识别所选子集的组索引然后被发送到移动台。 随后，从移动台接收向量索引，对应于所选子集中的预编码向量的向量索引，并且使用应用于多个发射机站点处的发射机天线的预编码矢量将数据发送到移动台。

公开(公告)号：US20110026626A1

公开(公告)日：2011-02-03

申请号：US12936301

申请日：2008-04-07

申请人： Henrik Sahlin ,  Ulf Lindgren ,  Kambiz Zangi

发明人： Henrik Sahlin ,  Ulf Lindgren ,  Kambiz Zangi

IPC分类号： H04L27/28

CPC分类号： H04L5/0037 ,  H04L5/0023 ,  H04W56/0005 ,  H04W88/085 ,  H04W92/10

摘要： Radio transmission in an Orthogonal Frequency Division Multiplex, OFDM, based cellular wireless radio transmission system, wherein radio access equipment of the system connects to multiple geographically spread radio antennas of a Distributed Antenna System, DAS, for transmitting to and receiving radio signals from user equipment. Transmit timings for radio transmission between the user equipment and the antennas of the DAS are established. The radio transmission is scheduled based on the established transmit timings.

摘要翻译： 在正交频分复用OFDM基于蜂窝无线电传输系统中的无线电传输，其中系统的无线电接入设备连接到分布式天线系统DAS的多个地理上扩展的无线电天线，用于发送和接收来自用户设备的无线电信号 。 建立用户设备和DAS天线之间无线电传输的发送定时。 基于建立的发送定时来调度无线电传输。

公开(公告)号：US20100271931A1

公开(公告)日：2010-10-28

申请号：US12555973

申请日：2009-09-09

申请人： Jung-Fu Cheng ,  Kambiz Zangi ,  Dennis Hui ,  Leonid Krasny

发明人： Jung-Fu Cheng ,  Kambiz Zangi ,  Dennis Hui ,  Leonid Krasny

IPC分类号： H04J11/00 ,  H04B17/00

CPC分类号： H04B17/0047 ,  H04B7/024 ,  H04B7/0626 ,  H04B7/0639 ,  H04B17/336 ,  H04B17/364 ,  H04L1/0003 ,  H04L1/0009 ,  H04L1/0019 ,  H04L1/0026 ,  H04L1/20 ,  H04L25/0212 ,  H04L25/022 ,  H04L25/0224

摘要： Accurate downlink channel estimates are calculated based on infrequently transmitted Channel State Information (CSI) feedback data from a UE 20. A plurality of non-uniformly spaced digital CSI feedback samples, representing the frequency response of a downlink communication channel, is received from the UE. The received CSI feedback samples are demodulated and inverse quantized. A time domain tap delay channel model is generated from the inverse quantized CSI feedback samples. The time domain tap delay channel model may be frequency-transformed to obtain a reconstructed frequency response of the downlink communication channel in the frequency domain. Alternatively, channel delays may be estimated based on prior delays and/or known references signals transmitted on the uplink. Channel estimates between CSI reporting instances may be predicted, such as by a sample & hold or a linear predictor. The delays may be presumed fixed, and Kalman filter coefficients evolved over time.

摘要翻译： 基于来自UE20的不频繁发送的信道状态信息（CSI）反馈数据来计算准确的下行链路信道估计。从UE接收表示下行链路通信信道的频率响应的多个非均匀间隔的数字CSI反馈样本 。 接收的CSI反馈样本被解调和反量化。 时域抽头延迟信道模型是从逆向量化的CSI反馈样本生成的。 时域抽头延迟信道模型可以被频率变换以获得频域中下行链路通信信道的重构频率响应。 或者，可以基于在上行链路上发送的先前的延迟和/或已知的参考信号来估计信道延迟。 可以预测CSI报告实例之间的信道估计，例如通过采样和保持或线性预测器。 可以推测延迟是固定的，并且卡尔曼滤波器系数随时间演化。

公开(公告)号：US07099410B1

公开(公告)日：2006-08-29

申请号：US09237356

申请日：1999-01-26

申请人： Sandeep Chennakeshu ,  Kambiz Zangi ,  Gregory E. Bottomley

发明人： Sandeep Chennakeshu ,  Kambiz Zangi ,  Gregory E. Bottomley

IPC分类号： H04L27/06

CPC分类号： H04L25/03197 ,  H04L25/03299

摘要： The present invention involves demodulation of radio signals modulated with M-ary modulation in the presence of intersymbol interference distortion. The invention presents a method for reducing the number of multiplications needed to implement a maximum-likelihood-sequence-estimation (MLSE) equalizer for signals modulated with M-ary modulation. In exemplary embodiments of the present invention, the number of multiplications is reduced by pre-computing certain values needed for the determination of the branch metric and storing these pre-computed values in a product table. When a branch metric computation is to be made, whether it is an Euclidean branch metric computation or an Ungerboeck branch metric computation, certain multiplication operations are replaced by simple table look-up operations. As a result, the power efficiency and speed of the system are increased. Any receiver that demodulates signals that are modulated with M-ary modulation can be implemented using the present invention. The resulting demodulator will have a lower complexity than existing demodulators.

摘要翻译： 本发明涉及在存在符号间干扰失真的情况下解调用M进制调制的无线电信号。 本发明提出了一种用于减少对用M-ary调制调制的信号实现最大似然序列估计（MLSE）均衡器所需的乘法次数的方法。 在本发明的示例性实施例中，通过预先计算确定分支度量所需的某些值并将这些预先计算的值存储在产品表中来减少乘法次数。 当进行分支度量计算时，无论是欧几里德分支度量计算还是Ungerboeck分支度量计算，某些乘法运算都被简单的表查找操作所取代。 结果，系统的功率效率和速度增加。 可以使用本发明来实现解调通过M进制调制调制的信号的任何接收机。 所产生的解调器将具有比现有解调器更低的复杂度。

公开(公告)号：US20050176469A1

公开(公告)日：2005-08-11

申请号：US11051138

申请日：2005-02-04

申请人： Janet Stern-Berkowitz ,  Ana Iacono ,  Kambiz Zangi

发明人： Janet Stern-Berkowitz ,  Ana Iacono ,  Kambiz Zangi

IPC分类号： H04M1/00 ,  H04W16/28 ,  H04W36/08 ,  H04W36/18 ,  H04W36/36 ,  H04W88/02

CPC分类号： H04W36/30 ,  H04W16/28 ,  H04W88/02

摘要： Measurements for identifying pre-candidate cells are made by a wireless transmit/receive unit (WTRU) operating with a switched beam antenna in a wireless communication system. The switched beam antenna is a smart antenna generating a plurality of directional beams and an omni-directional beam. The WTRU measures signals from cells not in an active set of cells to define a pre-candidate set of cells. Measured signals from cells in the pre-candidate set of cells are compared to a threshold, and the corresponding cells are moved from the pre-candidate set of cells to a candidate set of cells based upon the comparison to the threshold. A measurement report is then sent to the network.

摘要翻译： 用于识别候选前小区的测量由无线通信系统中的切换波束天线操作的无线发射/接收单元（WTRU）进行。 切换波束天线是产生多个定向波束和全向波束的智能天线。 WTRU从不在活动的小区组中的小区测量信号以定义预先选择的小区集合。 将预先选择的单元组中的单元的测量信号与阈值进行比较，并且基于与阈值的比较，将相应的单元从预先选择的单元组移动到候选单元组。 然后将测量报告发送到网络。

公开(公告)号：US06597743B1

公开(公告)日：2003-07-22

申请号：US09454577

申请日：1999-12-07

申请人： Ali S. Khayrallah ,  Gregory E. Bottomley ,  Ravinder David Koilpillai ,  Kambiz Zangi

发明人： Ali S. Khayrallah ,  Gregory E. Bottomley ,  Ravinder David Koilpillai ,  Kambiz Zangi

IPC分类号： H04L2302

CPC分类号： H03M13/3955

摘要： A reduced search symbol estimation algorithm includes a forward recursion, a backward recursion, and a combining step. To reduce complexity, during the forward and backward recursions, the number of survivor states retained at each stage is less than the total number of states of the trellis. The survivor states are selected from a group of candidate states, that are connected by branches to survivors from the previous stage of the recursion. The decoder compares the accumulated path metrics for each candidate state and retains a specified number of states that is less than the total possible number of states. For the forward recursion, the retained states or survivor states, denoted as Qk, are stored along with the corresponding state metrics. For the backward recursion, the retained states, denoted as Rk, are stored along with the corresponding state metrics. During the combining step, the computation of a soft value is restricted to branches (s′,s) connecting survivor states s′ and s in the forward and backward recursions respectively.

摘要翻译： 减少的搜索符号估计算法包括正向递归，反向递归和组合步骤。 为了减少复杂性，在向前和向后递归期间，每个阶段保留的幸存者国家数量小于网格状态总数。 幸存者状态是从一组候选国中选出的，这些候选国通过分支到递归的前一阶段与幸存者相连。 解码器比较每个候选状态的累积路径度量，并保留小于总可能状态数的指定数量的状态。 对于正向递归，保留状态或幸存者状态（表示为Qk）与相应的状态度量一起存储。 对于反向递归，表示为Rk的保留状态与相应的状态度量一起存储。 在组合步骤中，软值的计算分别限制在向前和向后递归中连接幸存者状态s'和s的分支（s'，s）。

公开(公告)号：US09628232B2

公开(公告)日：2017-04-18

申请号：US12936301

申请日：2008-04-07

申请人： Henrik Sahlin ,  Ulf Lindgren ,  Kambiz Zangi

发明人： Henrik Sahlin ,  Ulf Lindgren ,  Kambiz Zangi

IPC分类号： H04L5/06 ,  H04L5/26 ,  H04W56/00 ,  H04W88/08 ,  H04W92/10 ,  H04L5/00

CPC分类号： H04L5/0037 ,  H04L5/0023 ,  H04W56/0005 ,  H04W88/085 ,  H04W92/10

摘要： Radio transmission in an Orthogonal Frequency Division Multiplex, OFDM, based cellular wireless radio transmission system, wherein radio access equipment of the system connects to multiple geographically spread radio antennas of a Distributed Antenna System, DAS, for transmitting to and receiving radio signals from user equipment. Transmit timings for radio transmission between the user equipment and the antennas of the DAS are established. The radio transmission is scheduled based on the established transmit timings.

公开(公告)号：US08675718B2

公开(公告)日：2014-03-18

申请号：US12571494

申请日：2009-10-01

申请人： Dennis Hui ,  Kambiz Zangi

发明人： Dennis Hui ,  Kambiz Zangi

IPC分类号： H04B1/38 ,  H04L27/00 ,  H04L7/00

CPC分类号： H04L25/03343 ,  H04B7/024 ,  H04B7/0617 ,  H04L5/0035 ,  H04L25/0204

摘要： Precoder weights employed at a base station which coordinates with other base stations to form a super-cell are determined by: (a) determining an initial downlink precoding matrix at the base station for a mobile station serviced by the base station in the super-cell; (b) revising a downlink receiver matrix associated with the mobile station based on the initial downlink precoding matrix; (c) transforming the downlink receiver matrix to an uplink precoder matrix associated with the mobile station; (d) revising an uplink receiver matrix associated with each base station in uplink communication with the mobile station based on the uplink precoder matrix associated with the mobile station; and (e) revising the initial downlink precoding matrix by transforming the uplink receiver matrix to a revised downlink precoding matrix. Steps (b), (c), (d) and (e) are repeated for a particular number of iterations to determine a final downlink precoding matrix for the mobile station.

摘要翻译： 通过以下方式确定在与其他基站协调以形成超小区的基站处采用的预编码器权重：（a）确定在基站处由基站在超小区中服务的移动台的初始下行链路预编码矩阵 ; （b）基于初始下行链路预编码矩阵修改与移动台相关联的下行链路接收机矩阵; （c）将所述下行链路接收机矩阵变换为与所述移动台相关联的上行链路预编码器矩阵; （d）基于与所述移动站相关联的所述上行链路预编码器矩阵，修改与所述移动站的上行链路通信中与每个基站相关联的上行链路接收机矩阵; 以及（e）通过将所述上行链路接收机矩阵变换为修改的下行链路预编码矩阵来修改所述初始下行链路预编码矩阵。 对于特定次数的迭代重复步骤（b），（c），（d）和（e）以确定移动台的最终下行链路预编码矩阵。