公开(公告)号：US20110176581A1

公开(公告)日：2011-07-21

申请号：US12958512

申请日：2010-12-02

申请人： Timothy A. Thomas ,  Bishwarup Mondal

发明人： Timothy A. Thomas ,  Bishwarup Mondal

IPC分类号： H04B1/7075

CPC分类号： H04B1/7097 ,  H04B1/7075 ,  H04B2201/70701 ,  H04B2201/709709 ,  H04J13/0062 ,  H04J13/16 ,  H04L5/0023 ,  H04L5/0026 ,  H04L5/0048 ,  H04L27/2611

摘要： A wireless communication system is provided that spreads pilot signals, or channel state information reference signals (CSI-RSs), using a spreading code chosen from a set of mutually unbiased bases (MUBs). The advantages of such spreading with MUBs are that multiple base stations can send their pilot signals on a same time-frequency resources, making the pilot signal design very efficient and also improving channel estimation at a user equipment through orthogonal and quasi-orthogonal spreading which gives a gain above noise and interference. A short spreading code chosen from MUBs may be used for spreading pilot signals transmitted from each antenna of a base station within a time-frequency resource comprising multiple closely-spaced subcarriers in frequency and/or multiple closely-spaced symbols in time.

摘要翻译： 提供一种使用从一组相互无偏距的基座（MUB）中选择的扩展码扩展导频信号或信道状态信息参考信号（CSI-RS）的无线通信系统。 MUB这种扩展的优点是，多个基站可以在相同的时频资源上发送其导频信号，使得导频信号设计非常有效，并且还通过正交和准正交扩频改进用户设备的信道估计， 增益高于噪声和干扰。 从MUB选择的短扩展码可以用于在时间频率资源中扩展从基站的每个天线发送的导频信号，所述时间 - 频率资源包括频率和/或多个紧密间隔的符号中的多个紧密间隔的子载波。

公开(公告)号：US08351544B2

公开(公告)日：2013-01-08

申请号：US12334917

申请日：2008-12-15

申请人： Bishwarup Mondal ,  Amitabha Ghosh ,  Fan Wang

发明人： Bishwarup Mondal ,  Amitabha Ghosh ,  Fan Wang

IPC分类号： H04L27/00

CPC分类号： H04B7/0478 ,  H04B7/0417 ,  H04B7/0639 ,  H04L5/0007 ,  H04L25/03343

摘要： A method and apparatus are provided for feedback for closed-loop transmitting with multiple transmit antenna elements and multiple receive antenna elements. A base station includes a codebook containing sets of weightings for the multiple transmit antenna elements, with each set of weightings identified by an index and the codebook known to the base station and a served mobile station (MS). The base station pre-codes pilot signals using a precoding matrix, preferably a unitary matrix, to produce pre-coded pilot signals, which precoding matrix may or may not be known to the MS and which precoding matrix may or may not be included in the codebook. The base station then transmits the pre-coded pilot signals to the MS via the multiple transmit antenna elements and, in response, receives an index to a set of weightings in the codebook for use in a subsequent transmission of a data stream.

摘要翻译： 提供了一种用于具有多个发射天线元件和多个接收天线元件的闭环发射的反馈的方法和装置。 基站包括码本，其包含多个发射天线单元的加权集合，每一组加权由索引和基站已知的码本和被服务的移动台（MS）标识。 基站使用预编码矩阵，优选地是酉矩阵来预编码导频信号，以产生预编码的导频信号，预编码矩阵可以是MS也可以不是已知的，并且哪个预编码矩阵可以或可以不包括在 码本。 然后，基站经由多个发送天线元件向MS发送预先编码的导频信号，作为响应，接收到码本中的一组加权的索引，用于数据流的后续发送。

公开(公告)号：US20100046643A1

公开(公告)日：2010-02-25

申请号：US12193820

申请日：2008-08-19

申请人： Bishwarup Mondal ,  Amitabha Ghosh ,  Fan Wang

发明人： Bishwarup Mondal ,  Amitabha Ghosh ,  Fan Wang

IPC分类号： H04L27/28

CPC分类号： H04L25/03343 ,  H04L5/0023 ,  H04L5/0048 ,  H04L2025/03414 ,  H04L2025/03426 ,  H04L2025/03808

摘要： An apparatus and method to feedforward non-quantized precoding weights in an OFDM communication system includes a first step (300) of sending feedback information from a subscriber station (SS) to a base station (BS). A next step (302) includes deriving non-quantized weight information from the feedback information. A next step (304) includes transmitting symbols carrying the non-quantized weight information and non-precoded pilot symbols by the BS. A next step (305) includes receiving the information and symbols by the SS. A next step (306) includes estimating the non-quantized weights from the symbols carrying the non-quantized weight information and the non-precoded pilot symbols by the SS. A next step (308) includes decoding data from the BS by the SS using the estimated non-quantized weight information.

摘要翻译： 一种用于在OFDM通信系统中前馈非量化预编码权重的装置和方法包括从用户站（SS）向基站（BS）发送反馈信息的第一步骤（300）。 下一步骤（302）包括从反馈信息中导出非量化的权重信息。 下一步骤（304）包括由BS发送携带非量化权重信息和非预编码导频符号的符号。 下一步骤（305）包括由SS接收信息和符号。 下一步骤（306）包括通过SS从携带非量化权重信息和非预编码导频符号的符号估计非量化权重。 下一步骤（308）包括使用估计的非量化权重信息从SS对来自BS的数据进行解码。

公开(公告)号：US20130094604A1

公开(公告)日：2013-04-18

申请号：US13275470

申请日：2011-10-18

申请人： Bishwarup Mondal ,  Timothy A. Thomas ,  Eugene Visotsky

发明人： Bishwarup Mondal ,  Timothy A. Thomas ,  Eugene Visotsky

IPC分类号： H04L27/00

CPC分类号： H04B7/024 ,  H04B7/0469 ,  H04B7/0478 ,  H04B7/0658

摘要： The specification and drawings present a new method, apparatus and software related product (e.g., a computer readable memory) for implementing precoding for a coordinated multi-point joint transmission in LTE wireless systems using a specific product structure for a multi-point precoding matrix with designed and/or specified usage of multi-point codebooks for generating spatial data stream between a UE having multiple antennas and a plurality of cells.

摘要翻译： 本说明书和附图提出了一种新的方法，装置和软件相关产品（例如，计算机可读存储器），用于在LTE无线系统中使用特定的产品结构实现协调的多点联合传输的预编码，用于多点预编码矩阵， 用于在具有多个天线的UE和多个小区之间生成空间数据流的多点码本的设计和/或指定用途。

公开(公告)号：US20110176439A1

公开(公告)日：2011-07-21

申请号：US12958544

申请日：2010-12-02

申请人： Bishwarup Mondal ,  Timothy A. Thomas

发明人： Bishwarup Mondal ,  Timothy A. Thomas

IPC分类号： H04L12/26 ,  H04W4/00

CPC分类号： H04L25/03343 ,  H04L5/0007 ,  H04L25/0204 ,  H04L25/0391

摘要： A method and apparatus for providing channel feedback is provided herein. During operation a covariance matrix at time t (R) is calculated as a function of a received downlink signal. In order to reduce overhead, R is normalized and quantized. The base unit then uses the covariance matrix estimate to determine appropriate channel beamforming weights, and instructs transmit beamforming circuitry to use the appropriate weights. In an embodiment, circuitry performs a method of calculating a first precoding matrix index I from a codebook using a received signal, calculating a second codebook index J* using the first precoding matrix index I to approximate a covariance matrix and calculating a quantized coefficient α* to approximate the covariance matrix wherein the quantized coefficient α* is determined using the first precoding matrix index I.

摘要翻译： 本文提供了一种用于提供信道反馈的方法和装置。 在运行期间，计算时间t（R）处的协方差矩阵作为接收的下行链路信号的函数。 为了减少开销，R被归一化和量化。 基本单元然后使用协方差矩阵估计来确定适当的信道波束成形权重，并且指示发送波束成形电路使用适当的权重。 在一个实施例中，电路执行使用接收信号从码本计算第一预编码矩阵索引I的方法，使用第一预编码矩阵索引I来计算第二码本索引J *以近似协方差矩阵并计算量化系数α* 近似协方差矩阵，其中使用第一预编码矩阵索引I确定量化系数α*

公开(公告)号：US20080285667A1

公开(公告)日：2008-11-20

申请号：US12060301

申请日：2008-04-01

申请人： Bishwarup Mondal ,  Robert M. Harrison ,  Timothy A. Thomas

发明人： Bishwarup Mondal ,  Robert M. Harrison ,  Timothy A. Thomas

IPC分类号： H04L27/28

CPC分类号： H04B7/0417 ,  H04B7/0465 ,  H04B7/063 ,  H04B7/0634 ,  H04B7/0639 ,  H04B7/066

摘要： A method an apparatus is described for providing feedback for closed-loop transmitting with multiple transmit and receive antennas. The method includes a first step 900 of providing a codebook containing sets of weightings for each data stream of the multiple transmit antennas with each set identified by an index known to a transmitter and a receiver. The same codebook is utilized for any number of data streams up to the number of transmit antennas. A next step 902 includes measuring a composite channel between the transmitter and receiver. A next step 904 includes determining at least one performance metric for each set of weightings in the codebook. A next step 906 includes selecting preferred weightings for each data stream in response to the performance metrics. A next step 908 includes feeding back an index of the preferred weightings to the transmitter for use in subsequent transmissions.

摘要翻译： 描述了一种用于提供用于具有多个发射和接收天线的闭环发射的反馈的装置的方法。 该方法包括第一步骤900，其提供包含多个发射天线的每个数据流的权重集的码本，每个集合由发射机和接收机已知的索引识别。 相同的码本被用于直到发射天线数量的任何数量的数据流。 下一步骤902包括测量发射机和接收机之间的复合信道。 下一步骤904包括确定码本中每一组加权的至少一个性能度量。 下一步骤906包括响应于性能度量为每个数据流选择优选权重。 接下来的步骤908包括将优先权重的索引反馈到发射机以用于随后的传输。

公开(公告)号：US08665806B2

公开(公告)日：2014-03-04

申请号：US12561377

申请日：2009-09-17

申请人： Fan Wang ,  Amitabha Ghosh ,  Bishwarup Mondal

发明人： Fan Wang ,  Amitabha Ghosh ,  Bishwarup Mondal

IPC分类号： H04W4/00 ,  H04B7/14

CPC分类号： H04B7/0417 ,  H04B7/024 ,  H04B7/0632 ,  H04B7/0634 ,  H04B7/0639 ,  H04L5/0021 ,  H04L25/0202 ,  H04L25/0204 ,  H04L25/0228 ,  H04L25/0248 ,  H04L25/03343 ,  H04L2025/03414 ,  H04L2025/03426 ,  H04L2025/03808 ,  H04W16/28 ,  H04W24/10 ,  H04W28/16

摘要： A system and method for passive coordination of base stations in a closed-loop multiple-input multiple-output wireless communication system, includes a first step 400 of allocating a subframe zone to be used by a serving base station and a neighboring base station to provide synchronized communications. A next step 402 includes defining at least one beam combination for the base stations, the beam combination to be used over at least one resource block of the allocated zone. A next step 406 includes reporting feedback on measured channel conditions for the zone at a first time for the at least one beam combination and associated resource block of the zone. A next step 408 includes providing synchronized communications using the feedback by the base stations over the zone at a second time by repeating the same associated at least one beam combination and associated resource block of the zone.

摘要翻译： 一种用于闭环多输入多输出无线通信系统中的基站的被动协调的系统和方法，包括：分配由服务基站和相邻基站使用的子帧区域的第一步骤400，以提供 同步通讯。 下一步骤402包括为基站定义至少一个波束组合，该波束组合将被用于所分配区域的至少一个资源块。 下一步骤406包括针对该区域的至少一个波束组合和相关联的资源块第一时间报告该区域的测量信道状况的反馈。 下一步骤408包括通过重复该区域的相同的相关联的至少一个波束组合和相关联的资源块，在第二时间使用基站在该区域上的反馈来提供同步通信。

公开(公告)号：US20100142462A1

公开(公告)日：2010-06-10

申请号：US12561377

申请日：2009-09-17

申请人： Fan Wang ,  Amitabha Ghosh ,  Bishwarup Mondal

发明人： Fan Wang ,  Amitabha Ghosh ,  Bishwarup Mondal

IPC分类号： H04W72/00

CPC分类号： H04B7/0417 ,  H04B7/024 ,  H04B7/0632 ,  H04B7/0634 ,  H04B7/0639 ,  H04L5/0021 ,  H04L25/0202 ,  H04L25/0204 ,  H04L25/0228 ,  H04L25/0248 ,  H04L25/03343 ,  H04L2025/03414 ,  H04L2025/03426 ,  H04L2025/03808 ,  H04W16/28 ,  H04W24/10 ,  H04W28/16

摘要： A system and method for passive coordination of base stations in a closed-loop multiple-input multiple-output wireless communication system, includes a first step 400 of allocating a subframe zone to be used by a serving base station and a neighboring base station to provide synchronized communications. A next step 402 includes defining at least one beam combination for the base stations, the beam combination to be used over at least one resource block of the allocated zone. A next step 406 includes reporting feedback on measured channel conditions for the zone at a first time for the at least one beam combination and associated resource block of the zone. A next step 408 includes providing synchronized communications using the feedback by the base stations over the zone at a second time by repeating the same associated at least one beam combination and associated resource block of the zone.

摘要翻译： 一种用于闭环多输入多输出无线通信系统中的基站的被动协调的系统和方法，包括：分配由服务基站和相邻基站使用的子帧区域的第一步骤400，以提供 同步通讯。 下一步骤402包括为基站定义至少一个波束组合，该波束组合将被用于所分配区域的至少一个资源块。 下一步骤406包括针对该区域的至少一个波束组合和相关联的资源块第一时间报告该区域的测量信道状况的反馈。 下一步骤408包括通过重复该区域的相同的相关联的至少一个波束组合和相关联的资源块，在第二时间使用基站在该区域上的反馈来提供同步通信。

公开(公告)号：US20090274226A1

公开(公告)日：2009-11-05

申请号：US12420092

申请日：2009-04-08

申请人： Bishwarup Mondal ,  Amitabha Ghosh ,  Fan Wang

发明人： Bishwarup Mondal ,  Amitabha Ghosh ,  Fan Wang

IPC分类号： H04L27/28 ,  H04B1/00

CPC分类号： H04L5/0023 ,  H04L5/0048 ,  H04L25/0226 ,  H04L25/0228 ,  H04L25/03343 ,  H04L27/2613 ,  H04L2025/03808

摘要： An apparatus and method for providing sounding channel based feedback in an OFDM communication system includes a first step (400) of defining a sounding channel spread out over multiple OFDM symbols within a frame. A next step (402) includes conveying a message to a subscriber station including information about the sounding channel. A next step (404) includes requesting a sounding waveform from the subscriber station. A next step (408) includes sending the sounding waveform from the subscriber station over the multiple OFDM symbols. A next step (410) includes sending a downlink transmission weighted in response to the sounding waveform.

摘要翻译： 一种用于在OFDM通信系统中提供基于探测信道的反馈的装置和方法包括：第一步骤（400），其定义在帧内的多个OFDM符号上扩展的探测信道。 下一步骤（402）包括将消息传送到订户站，包括关于探测信道的信息。 下一步骤（404）包括从用户站请求探测波形。 下一步骤（408）包括通过多个OFDM符号从用户站发送探测波形。 下一步骤（410）包括响应于探测波形发送加权的下行链路传输。

公开(公告)号：US09197284B2

公开(公告)日：2015-11-24

申请号：US12958512

申请日：2010-12-02

申请人： Timothy A. Thomas ,  Bishwarup Mondal

发明人： Timothy A. Thomas ,  Bishwarup Mondal

IPC分类号： H04B1/00 ,  H04B1/7097 ,  H04B1/7075 ,  H04J13/00 ,  H04J13/16 ,  H04L27/26 ,  H04L5/00

CPC分类号： H04B1/7097 ,  H04B1/7075 ,  H04B2201/70701 ,  H04B2201/709709 ,  H04J13/0062 ,  H04J13/16 ,  H04L5/0023 ,  H04L5/0026 ,  H04L5/0048 ,  H04L27/2611

摘要： A wireless communication system is provided that spreads pilot signals, or channel state information reference signals (CSI-RSs), using a spreading code chosen from a set of mutually unbiased bases (MUBs). The advantages of such spreading with MUBs are that multiple base stations can send their pilot signals on a same time-frequency resources, making the pilot signal design very efficient and also improving channel estimation at a user equipment through orthogonal and quasi-orthogonal spreading which gives a gain above noise and interference. A short spreading code chosen from MUBs may be used for spreading pilot signals transmitted from each antenna of a base station within a time-frequency resource comprising multiple closely-spaced subcarriers in frequency and/or multiple closely-spaced symbols in time.

摘要翻译： 提供一种使用从一组相互无偏距的基座（MUB）中选择的扩展码扩展导频信号或信道状态信息参考信号（CSI-RS）的无线通信系统。 MUB这种扩展的优点是，多个基站可以在相同的时频资源上发送其导频信号，使得导频信号设计非常有效，并且还通过正交和准正交扩频改进用户设备的信道估计， 增益高于噪声和干扰。 从MUB选择的短扩展码可以用于在时间频率资源中扩展从基站的每个天线发送的导频信号，所述时间 - 频率资源包括频率和/或多个紧密间隔的符号中的多个紧密间隔的子载波。