公开(公告)号：US08077691B2

公开(公告)日：2011-12-13

申请号：US11020888

申请日：2004-12-22

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

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

IPC分类号： H04B7/208

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：US07940663B2

公开(公告)日：2011-05-10

申请号：US11182694

申请日：2005-07-15

申请人： Tamer Kadous

发明人： Tamer Kadous

IPC分类号： G01R31/08

CPC分类号： H04L1/1829 ,  H04L1/1635 ,  H04L2001/125

摘要： Systems and methodologies are described that facilitate mitigating effects of mismatch errors related to incorrectly decoded acknowledgments indicative of successfully decoded data packets in a wireless network environment. Misinterpretation of a cumulative acknowledgment related to a number of successfully decoded data packets can be identified, and data packet transmission mismatch errors caused thereby can be evaluated to determine an optimal manner in which to decode and acknowledge remaining data packets to alleviate mismatch and restore synchronization between a transmitter of the data packets and a receiver thereof.

摘要翻译： 描述了系统和方法，其有助于减轻与在无线网络环境中指示成功解码的数据分组的错误解码的确认相关的失配错误的影响。 可以识别与多个成功解码的数据分组相关的累积确认的误解，并且可以评估由此引起的数据分组传输失配错误，以确定解码和确认剩余数据分组以减轻失配并最终恢复之间的同步的最佳方式 数据分组的发射机及其接收机。

公开(公告)号：US20070133668A1

公开(公告)日：2007-06-14

申请号：US11560735

申请日：2006-11-16

申请人： Ayman Naguib ,  Dhananjay Gore ,  Alexei Gorokhov ,  Tamer Kadous

发明人： Ayman Naguib ,  Dhananjay Gore ,  Alexei Gorokhov ,  Tamer Kadous

IPC分类号： H04B17/00

CPC分类号： H04L27/2647 ,  H04L1/0631 ,  H04L25/022

摘要： Techniques to facilitate estimating the frequency response of a wireless channel in an OFDM system are provided. The method and systems allow for combining signal information across multiple communication channels at one or more channel tap delays in order to determine appropriate taps for channel information.

摘要翻译： 提供了有助于估计OFDM系统中的无线信道的频率响应的技术。 该方法和系统允许在一个或多个信道抽头延迟的情况下在多个通信信道上组合信号信息，以便确定用于信道信息的合适的抽头。

公开(公告)号：US20070070928A1

公开(公告)日：2007-03-29

申请号：US11507787

申请日：2006-08-21

申请人： Arak Sutivong ,  Avneesh Agrawal ,  Tamer Kadous

发明人： Arak Sutivong ,  Avneesh Agrawal ,  Tamer Kadous

IPC分类号： H04B7/00 ,  H04B3/10

CPC分类号： H04W52/325 ,  H04B7/0417 ,  H04B7/063 ,  H04B7/0632

摘要： Systems and methodologies are described that facilitate providing auxiliary multiple-input, multiple-output (MIMO) pilot signals to MIMO user devices in a wireless communication environment. According to some aspects, a portion of data transmission power may be reallocated for auxiliary MIMO pilot transmission during a data segment in a time slot, in order to permit a MIMO user device to perform CQI and rank prediction. Additionally or alternatively, non-MIMO pilot transmission power may be reallocated in a pilot segment in the time slot for transmission of an auxiliary MIMO pilot signal to permit the MIMO user device to demodulate data transmitted in data segments of the time slot. MIMO pilot signals may additionally be time-division multiplexed within or across time slots and may be transmitted over available Walsh codes in data and control segments.

摘要翻译： 描述了有助于在无线通信环境中向MIMO用户设备提供辅助多输入多输出（MIMO）导频信号的系统和方法。 根据一些方面，可以在时隙中的数据段期间重新分配一部分数据发送功率用于辅助MIMO导频传输，以便允许MIMO用户设备执行CQI和秩预测。 附加地或替代地，可以在时隙中的导频段中重新分配非MIMO导频传输功率，以传输辅助MIMO导频信号，以允许MIMO用户设备解调在该时隙的数据段中发送的数据。 MIMO导频信号可以另外在时隙内或跨时隙进行时分复用，并且可以在数据和控制段中通过可用的沃尔什码传输。

公开(公告)号：US20070041457A1

公开(公告)日：2007-02-22

申请号：US11261823

申请日：2005-10-27

申请人： Tamer Kadous ,  Aamod Khadekar ,  Dhananjay Gore ,  Alexei Gorokhov

发明人： Tamer Kadous ,  Aamod Khadekar ,  Dhananjay Gore ,  Alexei Gorokhov

IPC分类号： H04K1/10

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，从形成有正交矩阵的V列的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。 所映射的符号被提供用于从T个发射天线传输，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：US20070010957A1

公开(公告)日：2007-01-11

申请号：US11441652

申请日：2006-05-25

申请人： Hemanth Sampath ,  Tamer Kadous

发明人： Hemanth Sampath ,  Tamer Kadous

IPC分类号： G06F19/00

CPC分类号： H04B7/12 ,  H04B1/1027 ,  H04B7/0417 ,  H04B7/063 ,  H04B7/0632 ,  H04L1/0026 ,  H04L1/0656 ,  H04L1/0675 ,  H04L25/03242 ,  H04L2025/03426

摘要： Systems and methodologies are described that facilitate integrating a list-sphere decoding design in a multiple input-multiple output (MIMO wireless communication environment. According to various aspects, optimal rank selection and CQI computation for an optimal rank can be performed in conjunction with a non-linear receiver, such as a maximum life (ML) MMSE receiver, a non-linear receiver with a list-sphere decoder, and the like. Optimal rank selection can be performed using a maximum rank selection protocol, a channel capacity-based protocol, or any other suitable protocol that facilitates rank selection, and CQI information can be generated based in part on effective SNRs determined with regard to a selected optimal rank.

摘要翻译： 描述了有助于将多个输入多输出（MIMO无线通信环境）中的列表球体解码设计进行集成的系统和方法，根据各个方面，最佳秩选择和最佳秩的CQI计算可以结合非 - 线性接收机，例如最大寿命（ML）MMSE接收机，具有列表球体解码器的非线性接收机等。最佳秩选择可以使用最大秩选择协议，基于信道容量的协议 或有助于等级选择的任何其它合适的协议，并且可以部分地基于针对所选择的最优等级确定的有效SNR来生成CQI信息。

公开(公告)号：US20060286974A1

公开(公告)日：2006-12-21

申请号：US11260895

申请日：2005-10-27

申请人： Dhananjay Gore ,  Alexei Gorokhov ,  Hemanth Sampath ,  Tingfang Ji ,  Tamer Kadous

发明人： Dhananjay Gore ,  Alexei Gorokhov ,  Hemanth Sampath ,  Tingfang Ji ,  Tamer Kadous

IPC分类号： H04Q7/20

CPC分类号： H04W16/00 ,  H04B7/0408 ,  H04B7/0695 ,  H04W16/24 ,  H04W16/28 ,  H04W72/046 ,  H04W72/085

摘要： Apparatuses and methodologies are described that enhance performance in a wireless communication system using beamforming transmissions. According to one aspect, a set of transmit beams are defined that simultaneously provides for space division multiplexing, multiple-input multiple output (MIMO transmission and opportunistic beamforming. The addition of a wide beam guarantees a minimum acceptable performance for all user devices.

公开(公告)号：US20060269009A1

公开(公告)日：2006-11-30

申请号：US11501130

申请日：2006-08-07

申请人： Ranganathan Krishnan ,  Anand Subramaniam ,  Tamer Kadous

发明人： Ranganathan Krishnan ,  Anand Subramaniam ,  Tamer Kadous

IPC分类号： H04K1/10 ,  H04L1/02

CPC分类号： H04W52/42 ,  H04B7/0667 ,  H04L5/0023 ,  H04L5/0048

摘要： Pilot and data transmission schemes for multi-antenna communication systems utilizing multi-carrier modulation are provided. Subband multiplexing is used to avoid interference resulting from transmitting multiple signals simultaneously from multiple antennas. M usable subbands are initially arranged to form multiple groups of subbands, with each group including a different subset of the usable subbands. Each of T transmit antennas is then assigned one or possibly more subband groups for pilot transmission and typically one subband group for data transmission. Pilot and data may then be transmitted from each antenna on the subbands assigned to that antenna for pilot and data transmission. For each transmit antenna, the transmit power for each assigned subband may be scaled higher such that all of the total transmit power available for the antenna is used for transmission. Pilot and/or data may be transmitted simultaneously from all T antennas on all usable subbands without causing mutual interference.

公开(公告)号：US20060133521A1

公开(公告)日：2006-06-22

申请号：US11021791

申请日：2004-12-22

申请人： Hemanth Sampath ,  Tamer Kadous

发明人： Hemanth Sampath ,  Tamer Kadous

IPC分类号： H04K1/10

CPC分类号： H04L1/0618 ,  H04B7/0486 ,  H04L27/2608

摘要： The performance of a Single Code Word (SCW) design with low complexity MMSE receiver & rank prediction is similar to the Multiple Code Word (MCW) design with successive interference cancellation (SIC). A method of rank prediction comprises calculating MIMO channel matrices corresponding to layer transmissions for each tone, calculating signal-to-noise ratios (SNRs) for each tone based on the MIMO channel matrices, mapping the SNR for each tone to generate effective SNRs for each layer transmission, selecting a highest packet format (PF) with an SNR threshold less than the effective SNR for each layer transmission, maximizing an over-all spectral efficiency based on the selected highest packet formats for each layer transmission, and selecting a rank based on maximizing an over-all spectral efficiency.

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.