公开(公告)号：US08073068B2

公开(公告)日：2011-12-06

申请号：US11377458

申请日：2006-03-15

申请人： Byoung-Hoon Kim ,  Tamer Kadous

发明人： Byoung-Hoon Kim ,  Tamer Kadous

IPC分类号： H04B7/06

CPC分类号： H04L1/0026 ,  H04B7/061 ,  H04B7/0671 ,  H04L1/06 ,  H04L1/20 ,  H04W52/42

摘要： Techniques for transmitting data from virtual antennas instead of physical antennas are described. Each virtual antenna may be mapped to some or all physical antennas by a different mapping. The performance of different sets of at least one virtual antenna is evaluated based on one or more metrics such as signal quality, throughput, overall rate, and so on. The virtual antenna set with the best performance is selected for use. If the virtual antenna selection is performed by the receiver, then channel state information for the selected virtual antenna set may be sent to the transmitter. The channel state information may convey the selected virtual antenna(s), the signal quality or rate(s) for the selected virtual antenna(s), one or more preceding matrices used to form the selected virtual antenna(s), and so on. The transmitter and/or receiver use the selected virtual antenna(s) for data transmission.

摘要翻译： 描述了用于从虚拟天线而不是物理天线发送数据的技术。 每个虚拟天线可以通过不同的映射映射到一些或全部物理天线。 基于一个或多个度量（如信号质量，吞吐量，总体速率等）来评估不同组的至少一个虚拟天线的性能。 选择具有最佳性能的虚拟天线组使用。 如果由接收机执行虚拟天线选择，则可以将所选择的虚拟天线组的信道状态信息发送到发射机。 信道状态信息可以传送所选择的虚拟天线，所选择的虚拟天线的信号质量或速率，用于形成所选择的虚拟天线的一个或多个以前的矩阵，等等 。 发射机和/或接收机使用所选择的虚拟天线进行数据传输。

公开(公告)号：US20070041464A1

公开(公告)日：2007-02-22

申请号：US11377458

申请日：2006-03-15

申请人： Byoung-Hoon Kim ,  Tamer Kadous

发明人： Byoung-Hoon Kim ,  Tamer Kadous

IPC分类号： H04L1/02

CPC分类号： H04L1/0026 ,  H04B7/061 ,  H04B7/0671 ,  H04L1/06 ,  H04L1/20 ,  H04W52/42

摘要： Techniques for transmitting data from virtual antennas instead of physical antennas are described. Each virtual antenna may be mapped to some or all physical antennas by a different mapping. The performance of different sets of at least one virtual antenna is evaluated based on one or more metrics such as signal quality, throughput, overall rate, and so on. The virtual antenna set with the best performance is selected for use. If the virtual antenna selection is performed by the receiver, then channel state information for the selected virtual antenna set may be sent to the transmitter. The channel state information may convey the selected virtual antenna(s), the signal quality or rate(s) for the selected virtual antenna(s), one or more preceding matrices used to form the selected virtual antenna(s), and so on. The transmitter and/or receiver use the selected virtual antenna(s) for data transmission.

摘要翻译： 描述了用于从虚拟天线而不是物理天线发送数据的技术。 每个虚拟天线可以通过不同的映射映射到一些或全部物理天线。 基于一个或多个度量（如信号质量，吞吐量，总体速率等）来评估不同组的至少一个虚拟天线的性能。 选择具有最佳性能的虚拟天线组使用。 如果由接收机执行虚拟天线选择，则可以将所选择的虚拟天线组的信道状态信息发送到发射机。 信道状态信息可以传送所选择的虚拟天线，所选择的虚拟天线的信号质量或速率，用于形成所选择的虚拟天线的一个或多个以前的矩阵，等等 。 发射机和/或接收机使用所选择的虚拟天线进行数据传输。

公开(公告)号：US09860033B2

公开(公告)日：2018-01-02

申请号：US13271113

申请日：2011-10-11

申请人： Tamer Kadous ,  Aamod Khandekar ,  Dhananjay Ashok Gore ,  Alexei Gorokhov

发明人： Tamer Kadous ,  Aamod Khandekar ,  Dhananjay Ashok Gore ,  Alexei Gorokhov

IPC分类号： H04L5/00 ,  H04L27/26 ,  H04B7/04 ,  H04B7/06 ,  H04B7/0456

CPC分类号： H04L5/0023 ,  H04B7/0456 ,  H04B7/061 ,  H04B7/0671 ,  H04B7/0691 ,  H04B7/0697 ,  H04L27/2602

摘要： Transmission schemes that can flexibly achieve the desired spatial multiplexing order, spatial diversity order, and channel estimation overhead order are described. For data transmission, the assigned subcarriers and spatial multiplexing order (M) for a receiver are determined, where M≧1. For each assigned subcarrier, M virtual antennas are selected from among V virtual antennas formed with V columns of an orthonormal matrix, where V≧M. V may be selected to achieve the desired spatial diversity order and channel estimation overhead order. Output symbols are mapped to the M virtual antennas selected for each assigned subcarrier by applying the orthonormal matrix. Pilot symbols are also mapped to the V virtual antennas. The mapped symbols are provided for transmission from T transmit antennas, where T≧V. Transmission symbols are generated for the mapped symbols, e.g., based on OFDM or SC-FDMA. Different cyclic delays may be applied for the T transmit antennas to improve diversity.

公开(公告)号：US08654705B2

公开(公告)日：2014-02-18

申请号：US12754018

申请日：2010-04-05

申请人： Jibing Wang ,  Tamer Kadous ,  Rashid Ahmed Akbar Attar

发明人： Jibing Wang ,  Tamer Kadous ,  Rashid Ahmed Akbar Attar

IPC分类号： H04W52/04

CPC分类号： H04B7/0613 ,  H04B7/0617 ,  H04B7/0619 ,  H04B7/0634 ,  H04B7/0691 ,  H04B7/0695 ,  H04W52/42

摘要： Techniques for rank adaptation and multiple-stream reverse link communications in a wireless access network are disclosed. A remote unit transmits one or more reverse link data streams using separate identifiers to a base station. The number of reverse link data streams may be determined according to feedback from the base station or it may be determined by testing one or more multiple-antenna transmit hypotheses. The base station may estimate channel conditions using information obtained from the one or more reverse link data streams and may determine a spatial rank of the communication channel. The remote unit may perform separate error control and power control processes for each reverse link data stream in cooperation with the base station.

摘要翻译： 公开了一种用于无线接入网络中的秩适配和多流反向链路通信的技术。 远程单元使用单独的标识符向基站发送一个或多个反向链路数据流。 反向链路数据流的数量可以根据来自基站的反馈来确定，或者可以通过测试一个或多个多天线发射假设来确定。 基站可以使用从一个或多个反向链路数据流获得的信息估计信道条件，并且可以确定通信信道的空间等级。 远程单元可以与基站协作地为每个反向链路数据流执行单独的错误控制和功率控制过程。

公开(公告)号：US08619717B2

公开(公告)日：2013-12-31

申请号：US12690307

申请日：2010-01-20

申请人： Avneesh Agrawal ,  Rajiv Vijayan ,  Tamer Kadous

发明人： Avneesh Agrawal ,  Rajiv Vijayan ,  Tamer Kadous

IPC分类号： H04B7/00

CPC分类号： H04L1/0618 ,  H04B7/0417 ,  H04B7/0443 ,  H04B7/0465 ,  H04B7/0615 ,  H04B7/0891 ,  H04W52/34 ,  H04W52/42

摘要： A rate adaptive transmission scheme for MIMO systems, which can transmit a variable number of data symbol streams, provide transmit diversity for each data symbol stream, and fully utilize the total transmit power of the system and the full power of each antenna. In one method, at least one data symbol stream is received for transmission from a plurality of antennas. Each data symbol stream is scaled with a respective weight corresponding to the amount of transmit power allocated to that stream. The scaled data symbol stream(s) are multiplied with a transmit basis matrix to provide a plurality of transmit symbol streams for the plurality of antennas. The transmit basis matrix (e.g., a Walsh-Hadamard matrix or a DFT matrix) is defined such that each data symbol stream is transmitted from all antennas and each transmit symbol stream is transmitted at (or near) the full power for the associated antenna.

摘要翻译： 可以传输可变数量的数据符号流的MIMO系统的速率自适应传输方案为每个数据符号流提供发射分集，并且充分利用系统的总发射功率和每个天线的全功率。 在一种方法中，接收至少一个数据符号流用于从多个天线发射。 每个数据符号流用对应于分配给该流的发射功率的量的相应权重进行缩放。 缩放的数据符号流与发射基矩阵相乘以为多个天线提供多个发射符号流。 定义发射基矩阵（例如，沃尔什 - 哈达玛矩阵或DFT矩阵），使得每个数据符号流从所有天线发送，并且每个发射符号流以（或接近）相关天线的全功率发射。

公开(公告)号：US20120120925A1

公开(公告)日：2012-05-17

申请号：US13271121

申请日：2011-10-11

申请人： Tamer Kadous ,  Aamod Khandekar ,  Dhananjay Ashok Gore ,  Alexei Gorokhov

发明人： Tamer Kadous ,  Aamod Khandekar ,  Dhananjay Ashok Gore ,  Alexei Gorokhov

IPC分类号： H04W72/04

CPC分类号： H04L5/0023 ,  H04B7/0456 ,  H04B7/061 ,  H04B7/0671 ,  H04B7/0691 ,  H04B7/0697 ,  H04L27/2602

摘要： Transmission schemes that can flexibly achieve the desired spatial multiplexing order, spatial diversity order, and channel estimation overhead order are described. For data transmission, the assigned subcarriers and spatial multiplexing order (M) for a receiver are determined, where M≧1. For each assigned subcarrier, M virtual antennas are selected from among V virtual antennas formed with V columns of an orthonormal matrix, where V≧M. V may be selected to achieve the desired spatial diversity order and channel estimation overhead order. Output symbols are mapped to the M virtual antennas selected for each assigned subcarrier by applying the orthonormal matrix. Pilot symbols are also mapped to the V virtual antennas. The mapped symbols are provided for transmission from T transmit antennas, where T≧V. Transmission symbols are generated for the mapped symbols, e.g, based on OFDM or SC-FDMA. Different cyclic delays may be applied for the T transmit antennas to improve diversity.

摘要翻译： 描述了可以灵活地实现期望的空间复用顺序，空间分集顺序和信道估计开销顺序的传输方案。 对于数据传输，确定接收机的分配子载波和空间复用顺序（M），其中M≥1。 对于每个分配的子载波，从由正交矩阵的V列形成的V个虚拟天线中选择M个虚拟天线，其中V≥M。 可以选择V以实现期望的空间分集顺序和信道估计开销顺序。 通过应用正交矩阵将输出符号映射到为每个分配的副载波选择的M个虚拟天线。 导频符号也映射到V虚拟天线。 映射的符号被提供用于从T发射天线发射，其中T≥V。 为映射符号生成传输符号，例如基于OFDM或SC-FDMA。 可以对T发射天线应用不同的循环延迟以改善分集。

公开(公告)号：US07903615B2

公开(公告)日：2011-03-08

申请号：US11869589

申请日：2007-10-09

申请人： Alexei Gorokhov ,  Tamer Kadous

发明人： Alexei Gorokhov ,  Tamer Kadous

IPC分类号： H04B7/216

CPC分类号： H04B7/0697 ,  H04L1/1685 ,  H04L2001/0093 ,  H04W16/28 ,  H04W72/12

摘要： Space division multiple access channelization is provided that includes scheduling transmission for two or more terminals and utilizing different code offsets that correspond to different sub-trees. The transmissions can be scheduled on overlapping frequency resources for overlapping time periods on different spatial resources. The pilot code offsets provide different pilot signatures so that the pilot transmissions do not overlap. The overlapping frequency resources can partially overlap or completely overlap.

摘要翻译： 提供了空分多址信道化，其包括对两个或更多个终端进行调度传输，并利用与不同子树相对应的不同的码偏移。 可以在重叠的频率资源上调度传输，以便在不同的空间资源上重叠时间段。 导频代码偏移提供不同的导频签名，使得导频传输不重叠。 重叠频率资源可能部分重叠或完全重叠。

公开(公告)号：US07890144B2

公开(公告)日：2011-02-15

申请号：US12257200

申请日：2008-10-23

申请人： Anand D. Subramaniam ,  Tamer Kadous

发明人： Anand D. Subramaniam ,  Tamer Kadous

IPC分类号： H04B1/38 ,  H04B17/00

CPC分类号： H04L1/0687 ,  H04B7/0602 ,  H04B7/0802 ,  H04L1/0003 ,  H04L1/0009

摘要： Techniques are provided to support successive interference cancellation (SIC) receiver processing with selection diversity whereby each of NT transmit antennas may be turned on or off. One symbol stream may be transmitted from each transmit antenna. A SIC receiver recovers the transmitted symbol streams in a specific order. Up to NT! orderings are evaluated. For each ordering, NT post-detection SNRs are obtained for NT transmit antennas and used to determine NT data rates, where the data rate is zero if the post-detection SNR is worse than a minimum required SNR. An overall data rate is computed for each ordering based on the NT data rates. The ordering with the highest overall data rate is selected for use. Up to NT symbol streams are processed at the data rates for the selected ordering and transmitted. The transmitted symbol streams are recovered in accordance with the selected ordering.

摘要翻译： 技术被提供以支持具有选择分集的连续干扰消除（SIC）接收机处理，从而可以打开或关闭每个NT个发射天线。 一个符号流可以从每个发送天线发送。 SIC接收器以特定顺序恢复发送的符号流。 达NT！ 对订单进行评估。 对于每个排序，对于NT个发射天线获得NT后检测SNR，并且用于确定NT数据速率，其中如果后检测SNR比最小所需SNR更差，则数据速率为零。 基于NT数据速率对每个排序计算总体数据速率。 选择具有最高总数据速率的排序使用。 最多NT个符号流以所选择的排序和传输的数据速率进行处理。 所发送的符号流根据所选择的顺序被恢复。

公开(公告)号：US07463576B2

公开(公告)日：2008-12-09

申请号：US11101908

申请日：2005-04-07

申请人： Ranganathan Krishnan ,  Tamer Kadous

发明人： Ranganathan Krishnan ,  Tamer Kadous

IPC分类号： H04J11/00

CPC分类号： H04W52/325 ,  H04L25/0212 ,  H04L25/022 ,  H04L25/023 ,  H04W52/24 ,  H04W52/34 ,  H04W52/42

摘要： Techniques to estimate the frequency response of a wireless channel in an OFDM system. In one method, an initial estimate of the frequency response of the wireless channel is obtained for a first group of subbands based on a pilot transmission received via the subbands in the first group. An estimate of the impulse response of the wireless channel is then derived based on the initial frequency response estimate. An enhanced estimate of the frequency response of the wireless channel is then derived for a second group of subbands based on the impulse response estimate. The first and second groups may each include all or only a subset of the usable subbands. Subband multiplexing may be used to allow simultaneous pilot transmissions by multiple terminals on their associated groups of subbands.

摘要翻译： 估计OFDM系统中无线信道的频率响应的技术。 在一种方法中，基于经由第一组中的子带接收的导频传输，针对第一组子带获得无线信道的频率响应的初始估计。 然后基于初始频率响应估计推导出无线信道的脉冲响应的估计。 然后基于脉冲响应估计对第二组子带导出对无线信道的频率响应的增强估计。 第一组和第二组可以各自包括全部或仅一个可用子带的子集。 子带复用可用于允许在其相关联的子带组上的多个终端的同时导频传输。

公开(公告)号：US20080112495A1

公开(公告)日：2008-05-15

申请号：US11873375

申请日：2007-10-16

申请人： Dhananjay Ashok Gore ,  Avneesh Agrawal ,  Tamer Kadous

发明人： Dhananjay Ashok Gore ,  Avneesh Agrawal ,  Tamer Kadous

IPC分类号： H04K1/10

CPC分类号： H04L25/0204 ,  H04L25/0212 ,  H04L25/0226 ,  H04L27/261

摘要： Each transmitter is assigned a time-only pilot code, a frequency-only pilot code, or a time-frequency pilot code to use for pilot transmission. The pilot codes may be pseudo-random, orthogonal, and/or cyclic-shift codes. To obtain a channel estimate for a transmitter using a time-frequency pilot code composed of a time-only code and a frequency-only code, a receiver multiplies a set of received symbols for each symbol period with a set of code values for the frequency-only code to obtain a set of detected symbols and performs an IDFT on the set of detected symbols to obtain an initial impulse response estimate. The receiver performs code matching on multiple initial impulse response estimates derived for multiple symbol periods with the time-only code to obtain a final impulse response estimate for the desired transmitter. The receiver retains the first L channel taps and zeroes out remaining channel taps, where L is the expected channel length.

摘要翻译： 为每个发射机分配一个仅时间导频码，仅频率导频码或用于导频传输的时频导频码。 导频码可以是伪随机，正交和/或循环移位码。 为了使用由时间唯一码和仅频率码构成的时频导频码来获得用于发射机的信道估计，接收机将用于每个符号周期的一组接收符号与频率的一组码值相乘 - 获得一组检测符号的代码，并对检测符号集合执行IDFT以获得初始脉冲响应估计。 接收机对具有多个符号周期的多个初始脉冲响应估计执行码匹配，其中仅使用时间码来获得所需发射机的最终脉冲响应估计。 接收器保留第一个L个通道抽头，并将剩余的通道抽头置零，其中L是预期的通道长度。