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：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：US08897834B2

公开(公告)日：2014-11-25

申请号：US13292738

申请日：2011-11-09

申请人： Karl J. Molnar ,  Kambiz Zangi ,  Leonid Krasny ,  Stephen Grant ,  Jonas B. Karlsson

发明人： Karl J. Molnar ,  Kambiz Zangi ,  Leonid Krasny ,  Stephen Grant ,  Jonas B. Karlsson

IPC分类号： H04M1/00 ,  H04B7/00 ,  H04W4/00 ,  H04B7/02 ,  H04B7/10 ,  H04B7/06 ,  H04W88/02

CPC分类号： H04B7/0619 ,  H04B7/024 ,  H04B7/061 ,  H04B7/0639 ,  H04B7/0691 ,  H04B7/10 ,  H04W72/12 ,  H04W72/1278 ,  H04W88/02

摘要： A communication device is described herein that has control (or at least partial control) over which virtual antenna(s) in one or more base stations to use for transmissions. In one embodiment, the mobile phone performs the following steps: (1) receives an antenna subset list (from the scheduling unit) which identifies a configuration of virtual antennas that is associated with the base station(s); (2) uses the antenna subset list to select which virtual antenna(s) in the configuration of virtual antennas to use for transmissions; and (3) sends an antenna selection signal (to the scheduling unit) which contains information that instructs/requests the base station(s)/scheduling unit to use the selected virtual antenna(s) for transmissions.

摘要翻译： 本文描述的通信设备具有控制（或至少部分控制），一个或多个基站中的虚拟天线将用于传输。 在一个实施例中，移动电话执行以下步骤：（1）从识别与基站相关联的虚拟天线的配置接收来自调度单元的天线子集列表; （2）使用天线子集列表来选择用于传输的虚拟天线的配置中的哪些虚拟天线; 并且（3）发送包含指示/请求基站/调度单元使用所选择的虚拟天线进行传输的信息的天线选择信号（到调度单元）。

公开(公告)号：US08406326B2

公开(公告)日：2013-03-26

申请号：US12779106

申请日：2010-05-13

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

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

IPC分类号： H04K1/10

CPC分类号： H04W72/0413 ,  H04L1/0019 ,  H04L1/0028 ,  H04L1/20 ,  H04W72/042

摘要： The required bitrate for reporting channel state information from a network transceiver to the network is dramatically reduced, while maintaining fidelity of channel estimates, by exploiting prior channel estimates and the time correlation of channel response. For a selected set of sub-carriers, the transceiver estimates channel frequency response from pilot signals. The transceiver also predicts the frequency response for each selected sub-carrier, by multiplying a state vector comprising prior frequency response estimate and a coefficient vector comprising linear predictive coefficients. The predicted frequency response is subtracted from the estimated frequency response, and the prediction error is quantized and transmitted to the network. The network maintains a corresponding state vector and predictive coefficient vector, and also predicts a frequency response for each selected sub-carrier. The received prediction error is inverse quantized and subtracted from the predicted frequency response to yield a frequency response corresponding to that estimated at the transceiver.

摘要翻译： 通过利用先前的信道估计和信道响应的时间相关性，可以显着降低从网络收发器向网络报告信道状态信息所需的比特率，同时保持信道估计的保真度。 对于所选择的一组子载波，收发器估计来自导频信号的信道频率响应。 收发器还通过将包括先前频率响应估计的状态向量和包括线性预测系数的系数向量相乘来预测每个所选子载波的频率响应。 从估计的频率响应中减去预测的频率响应，并将预测误差量化并发送到网络。 网络维持相应的状态向量和预测系数向量，并且还预测每个选择的子载波的频率响应。 接收的预测误差被反量化，并从预测的频率响应中减去，以产生与在收发机处估计的频率响应相对应的频率响应。

公开(公告)号：US08320359B2

公开(公告)日：2012-11-27

申请号：US11531219

申请日：2006-09-12

申请人： Bengt Lindoff ,  Robert Baldemair ,  Kambiz Zangi ,  Stefan Parkvall

发明人： Bengt Lindoff ,  Robert Baldemair ,  Kambiz Zangi ,  Stefan Parkvall

IPC分类号： H04J3/06

CPC分类号： H04L27/2685 ,  H04B2201/70702 ,  H04J11/0069 ,  H04L5/0007 ,  H04L5/005 ,  H04L5/0053 ,  H04L5/0064 ,  H04L27/2613 ,  H04L27/2655

摘要： An apparatus and method operable to enable the use of synchronization (SCH) and broadcast channel (BCH) signals with a bandwidth (BW) equal to the minimum possible BW for the system, for example 1.25 MHz. The present invention increases the speed of the initial cell search. In addition, the repetition of signals in the frequency domain makes it possible to perform a faster cell detection in the event a system/mobile terminal/UE is using a larger BW. When the present invention is used in a high BW system, a mobile terminal/UE is operable to determine whether to perform a cell search on a low or high BW to get sufficient cell detection performance.

摘要翻译： 一种用于使能同步（SCH）和广播信道（BCH）信号的装置和方法，所述同步（SCH）和广播信道（BCH）信号的带宽（BW）等于系统的最小可能BW，例如1.25MHz。 本发明增加了初始小区搜索的速度。 此外，频域中的信号的重复使得可以在系统/移动终端/ UE正在使用较大的BW的情况下执行更快的小区检测。 当本发明用于高BW系统时，移动终端/ UE可操作以确定是否在低或高BW上执行小区搜索以获得足够的小区检测性能。

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：US20110026647A1

公开(公告)日：2011-02-03

申请号：US12510537

申请日：2009-07-28

申请人： Kambiz Zangi ,  Rajaram Ramesh

发明人： Kambiz Zangi ,  Rajaram Ramesh

IPC分类号： H04L27/06

CPC分类号： H04L25/03318 ,  H04L25/03229 ,  H04L2025/03388

摘要： Teachings presented herein offer reduced computational complexity for symbol sequence estimation, and also provide for the generation of soft bit values representing the reliability of that estimation. A demodulator is configured to generate these soft bit values by identifying a candidate value for each symbol in the sequence which is more likely than at least one other in a defined set of candidate values. Based on the candidate value identified for each symbol, the demodulator forms a reduced set of candidate values for the symbol by selecting as many additional candidate values from the defined set as are needed to have complementary bit values for each bit value in that identified candidate value. The demodulator calculates soft bit values for the symbol sequence based on a sequence estimation process whose state space for each symbol is constrained to the corresponding reduced set.

摘要翻译： 本文提供的教学提供了减少符号序列估计的计算复杂度，并且还提供了代表该估计的可靠性的软比特值的产生。 解调器被配置为通过在所定义的一组候选值中识别比所述序列中的至少另一个更可能的序列中的每个符号的候选值来生成这些软比特值。 基于为每个符号识别的候选值，解调器通过从所定义的集合中选择与所识别的候选值中的每个比特值具有互补比特值所需的附加候选值来形成用于该符号的候选值的缩减集合 。 解调器基于序列估计处理来计算符号序列的软比特值，其中每个符号的状态空间被约束到相应的缩减集。

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。