公开(公告)号：US20060034163A1

公开(公告)日：2006-02-16

申请号：US10890718

申请日：2004-07-13

申请人： Dhananjay Gore ,  Avneesh Agrawal ,  Tamer Kadous

发明人： Dhananjay Gore ,  Avneesh Agrawal ,  Tamer Kadous

IPC分类号： H04B1/707 ,  H04J11/00

CPC分类号： H04L25/0226 ,  H04B7/0452 ,  H04B7/0684 ,  H04L27/2613

摘要： Efficient pilot transmission schemes for multi-antenna communication systems are described. In general, MISO receivers prefer a pilot transmitted in one spatial direction, and MIMO receivers typically require a pilot transmitted in different spatial directions. In one pilot transmission scheme, a first set of T scaled pilot symbols is generated with a first training vector and transmitted (e.g., continuously) from T transmit antennas, where T>1. If MIMO receiver(s) are to be supported by the system, then at least T−1 additional sets of T scaled pilot symbols are generated with at least T−1 additional training vectors and transmitted from the T transmit antennas. The training vectors are for different (e.g., orthogonal) spatial directions. Each MISO receiver can estimate its MISO channel based on the first set of scaled pilot symbols. Each MIMO receiver can estimate its MIMO channel based on the first and additional sets of scaled pilot symbols.

公开(公告)号：US20060018411A1

公开(公告)日：2006-01-26

申请号：US11022146

申请日：2004-12-22

申请人： Dhananjay Gore ,  Avneesh Agrawal ,  Tamer Kadous

发明人： Dhananjay Gore ,  Avneesh Agrawal ,  Tamer Kadous

IPC分类号： H04L27/06

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。

公开(公告)号：US20060014499A1

公开(公告)日：2006-01-19

申请号：US11155204

申请日：2005-06-16

申请人： Alexei Gorokhov ,  Avneesh Agrawal ,  Dhananjay Gore ,  Tamer Kadous

发明人： Alexei Gorokhov ,  Avneesh Agrawal ,  Dhananjay Gore ,  Tamer Kadous

IPC分类号： H04B1/02 ,  H04B1/66

CPC分类号： H04L1/005 ,  H04L1/0003 ,  H04L1/0041 ,  H04L1/06

摘要： A MIMO communication system is adapted to encode multiple data streams at the same adaptable rate. Accordingly, the set of all possible modulation/rate combinations to all modulations with common rates is decreased thus resulting in the reduction of the number of possible packet formats carrying the data streams. Rate prediction is made more error-resilient, in part, due to the averaging over all information rates. Furthermore, the signaling overhead of the packets is reduced. Therefore, the tradeoff between the desired transmission rate granularity on the one hand, and robustness/signaling overhead on the other hand, is controlled by adjusting the coding rate.

公开(公告)号：US08457152B2

公开(公告)日：2013-06-04

申请号：US11155204

申请日：2005-06-16

申请人： Alexei Gorokhov ,  Avneesh Agrawal ,  Dhananjay Gore ,  Tamer Kadous

发明人： Alexei Gorokhov ,  Avneesh Agrawal ,  Dhananjay Gore ,  Tamer Kadous

IPC分类号： H04J3/16 ,  H04J9/00

CPC分类号： H04L1/005 ,  H04L1/0003 ,  H04L1/0041 ,  H04L1/06

摘要： A MIMO communication system is adapted to encode multiple data streams at the same adaptable rate. Accordingly, the set of all possible modulation/rate combinations to all modulations with common rates is decreased thus resulting in the reduction of the number of possible packet formats carrying the data streams. Rate prediction is made more error-resilient, in part, due to the averaging over all information rates. Furthermore, the signaling overhead of the packets is reduced. Therefore, the tradeoff between the desired transmission rate granularity on the one hand, and robustness/signaling overhead on the other hand, is controlled by adjusting the coding rate.

摘要翻译： MIMO通信系统适于以相同的可适应速率对多个数据流进行编码。 因此，对具有公共速率的所有调制的所有可能的调制/速率组合的集合被减少，从而导致承载数据流的可能分组格式的数量的减少。 速率预测更具有弹性，部分原因是由于所有信息速率的平均值。 此外，分组的信令开销减小。 因此，通过调整编码率来控制一方面期望的传输速率粒度与鲁棒性/信令开销之间的权衡。

公开(公告)号：US20050195763A1

公开(公告)日：2005-09-08

申请号：US11020888

申请日：2004-12-22

申请人： Tamer Kadous ,  Avneesh Agrawal ,  Dhananjay Gore

发明人： Tamer Kadous ,  Avneesh Agrawal ,  Dhananjay Gore

IPC分类号： H04J99/00 ,  H04B7/06 ,  H04L25/02 ,  H04B7/00

CPC分类号： H04L25/0226 ,  H04B7/0684

摘要： A transmitter generates multiple composite pilots with a training matrix and a gain matrix. Each composite pilot includes multiple training pilots generated with multiple columns of the training matrix and scaled with multiple gain elements in a column of the gain matrix. The transmitter transmits each composite pilot via multiple transmit antennas. A MISO receiver obtains received symbols for the multiple composite pilots and derives an estimate of a composite MISO channel. For OFDM, the MISO receiver derives an initial impulse response estimate for each composite pilot, filters the initial impulse response estimates for all composite pilots, and derives a frequency response estimate for the composite MISO channel. A MIMO receiver obtains and processes received symbols for the multiple composite pilots based on the training and gain matrices and derives channel estimates for individual SISO channels between the multiple transmit antennas and multiple receive antennas.

摘要翻译： 发射机生成具有训练矩阵和增益矩阵的多个复合导频。 每个复合导频包括由训练矩阵的多列生成的多个训练导频，并且在增益矩阵的列中用多个增益元素进行了缩放。 发射机经由多个发射天线发送每个复合导频。 MISO接收器获得用于多个复合导频的接收符号，并导出复合MISO信道的估计。 对于OFDM，MISO接收机为每个复合导频导出初始脉冲响应估计，对所有复合导频进行初始脉冲响应估计，并得出复合MISO信道的频率响应估计。 MIMO接收机基于训练和增益矩阵获得并处理多个复合导频的接收符号，并导出多个发射天线与多个接收天线之间的各个SISO信道的信道估计。

公开(公告)号：US20070098099A1

公开(公告)日：2007-05-03

申请号：US11553870

申请日：2006-10-27

申请人： Dhananjay Gore ,  Hemanth Sampath ,  Jibing Wang ,  Tamer Kadous ,  Gwendolyn Barriac

发明人： Dhananjay Gore ,  Hemanth Sampath ,  Jibing Wang ,  Tamer Kadous ,  Gwendolyn Barriac

IPC分类号： H04K1/10 ,  H04L1/02

CPC分类号： H04B7/0456 ,  H04L1/0016 ,  H04L1/0026 ,  H04L1/0675 ,  H04L5/023 ,  H04L25/0206 ,  H04L27/2602 ,  H04L27/2608

摘要： Techniques to enhance the performance in a wireless communication system using segments called subbands and using precoding are shown. According to one aspect, the bandwidth for transmission to an access terminal is constrained to a preferred bandwidth which is less than the bandwidth available for transmission to an access terminal and precoding information related to the subcarriers within the constrained bandwidth is provided to a transmitter. The precoding information related to the subcarriers within a constrained bandwidth provides feedback about the forward link channel properties relative to different subbands and may be fed back on a channel associated with the bandwidth.

摘要翻译： 示出了使用称为子带并使用预编码的段来增强在无线通信系统中的性能的技术。 根据一个方面，用于传输到接入终端的带宽被限制到比可用于传输到接入终端的带宽的优选带宽，并且将与受限带宽内的子载波相关的预编码信息提供给发射机。 与受限带宽内的子载波相关的预编码信息提供关于相对于不同子带的前向链路信道属性的反馈，并且可以在与带宽相关联的信道上反馈。

公开(公告)号：US20060233131A1

公开(公告)日：2006-10-19

申请号：US11261822

申请日：2005-10-27

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

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

IPC分类号： H04Q7/00

CPC分类号： H04W72/08 ,  H04B1/7143 ,  H04B7/043 ,  H04B7/0632 ,  H04B7/065 ,  H04B7/0689 ,  H04B7/0697 ,  H04L1/0026 ,  H04L1/0027 ,  H04L1/20 ,  H04L5/0023 ,  H04L5/0037 ,  H04L5/0051 ,  H04L5/0057 ,  H04L5/006

摘要： Apparatuses and methodologies are described that enhance performance in a wireless communication system using beamforming transmissions. According to one aspect, the channel quality is monitored. Channel quality indicators can be used to select a scheduling technique, such as space division multiplexing (SDM), multiple-input multiple output (MIMO) transmission and opportunistic beamforming for one or more user devices. In addition, the CQI can be used to determine the appropriate beam assignment or to update the beam pattern.

摘要翻译： 描述了使用波束成形传输来增强在无线通信系统中的性能的装置和方法。 根据一个方面，监视信道质量。 信道质量指示符可以用于选择诸如空分复用（SDM），多输入多输出（MIMO）传输和一个或多个用户设备的机会波束成形的调度技术。 另外，可以使用CQI来确定适当的波束分配或更新波束图案。

公开(公告)号：US20070097889A1

公开(公告)日：2007-05-03

申请号：US11261064

申请日：2005-10-27

申请人： Jibing Wang ,  Tamer Kadous ,  Dhananjay Gore

发明人： Jibing Wang ,  Tamer Kadous ,  Dhananjay Gore

IPC分类号： H04L12/26 ,  H04J1/00 ,  H04J1/16

CPC分类号： H04B7/0639 ,  H04B7/063

摘要： Accordingly, a method and apparatus are provided wherein a receiver system selects a pre-coding matrix, comprising eigen-beamforming weights, to use and provides rank value and matrix index associated with the selected matrix to the transmitter system. The transmitter system upon receiving the rank value and matrix index, determine if the matrix associated with the matrix index provided by the receiver system can be used. If not, them transmitter system selects another matrix for determining eigen-beamforming weights.

摘要翻译： 因此，提供了一种方法和装置，其中接收机系统选择包括特征波束形成权重的预编码矩阵，以使用并向发射机系统提供与所选矩阵相关联的秩值和矩阵索引。 发射机系统在接收到秩值和矩阵索引后，确定是否可以使用与接收机系统提供的矩阵索引关联的矩阵。 如果不是，则它们发射机系统选择用于确定特征波束形成权重的另一矩阵。

公开(公告)号：US20070071127A1

公开(公告)日：2007-03-29

申请号：US11390622

申请日：2006-03-27

申请人： Dhananjay Gore ,  Tingfang Ji ,  Tamer Kadous

发明人： Dhananjay Gore ,  Tingfang Ji ,  Tamer Kadous

IPC分类号： H04L1/02

CPC分类号： H04L27/2613 ,  H04B7/0413 ,  H04L25/0226

摘要： Systems and methodologies are described that facilitate improved pilot information to MIMO user devices without increasing interference of SISO user devices in a wireless communication environment. A data communication signal can be generated and transmitted at a first power level, and a continuous pilot waveform comprising pilot information related to the data signal can be generated and sent at a second power level below the first transmission power level. Alternatively, a discontinuous pilot waveform can be generated so that it does not overlap with pilot segments in the first waveform, and can be transmitted at the first power level without interfering with the first waveform as received by a SISO user device. A MIMO user device can receive both waveforms, and can employ the pilot waveform to better estimate a MIMO channel for the first waveform.

摘要翻译： 描述了在不增加SISO用户设备在无线通信环境中的干扰的情况下促进对MIMO用户设备的改进的导频信息的系统和方法。 可以以第一功率电平生成并发送数据通信信号，并且可以以低于第一发送功率电平的第二功率电平生成包括与数据信号相关的导频信息的连续导频波形。 或者，可以生成不连续的导频波形，使得其不与第一波形中的导频段重叠，并且可以在不干扰由SISO用户设备接收的第一波形的情况下以第一功率电平发送。 MIMO用户设备可以接收两个波形，并且可以使用导频波形来更好地估计用于第一波形的MIMO信道。

公开(公告)号：US20070049218A1

公开(公告)日：2007-03-01

申请号：US11401979

申请日：2006-04-10

申请人： Alexei Gorokhov ,  Dhananjay Gore ,  Gwendolyn Barriac ,  Jibing Wang ,  Tamer Kadous

发明人： Alexei Gorokhov ,  Dhananjay Gore ,  Gwendolyn Barriac ,  Jibing Wang ,  Tamer Kadous

IPC分类号： H04B1/02 ,  H04B1/66

CPC分类号： H04L1/0001 ,  H04B7/0417 ,  H04B7/063 ,  H04B7/0639 ,  H04B7/0663 ,  H04B7/0689 ,  H04L1/06 ,  H04W72/04

摘要： Embodiments are described in connection with enhancing performance in a wireless communication system using codebook technology. According to an embodiment is a method for enhancing performance in a wireless communication environment. The method can include receiving a user preference for a transmission mode, associating the user preference with an entry or entries in a codebook, and assigning the user to a transmission mode corresponding to the entry or entries. The transmission mode can be one of a preceding, space division multiple access (SDMA), SDMA preceding, multiple input multiple output (MIMO), MIMO preceding, MIMO-SDMA and a diversity. Each entry can correspond to a transmission mode.

摘要翻译： 结合增强使用码本技术的无线通信系统中的性能来描述实施例。 根据实施例是用于增强无线通信环境中的性能的方法。 该方法可以包括接收用户对传输模式的偏好，将用户偏好与码本中的条目或条目相关联，并将用户分配给与条目或条目相对应的传输模式。 传输模式可以是先前的空分多址（SDMA），前面的SDMA，多输入多输出（MIMO），先前的MIMO，MIMO-SDMA和分集之一。 每个条目可以对应于传输模式。