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1. 发明申请

US20060014499A1 Multiple modulation schemes in single rate layering wireless communication systems 有权
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.

2. 发明授权

US08457152B2 Multiple modulation schemes in single rate layering wireless communication systems 有权
标题翻译：单速率分层无线通信系统中的多调制方案
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。

3. 发明申请

US20060034163A1 Pilot transmission schemes for a multi-antenna system 有权
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.

4. 发明申请

US20060018411A1 Pilot transmission and channel estimation for multiple transmitters 失效
标题翻译：多个发射机的导频传输和信道估计
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。

5. 发明申请

US20070049218A1 Precoding and SDMA support 有权
标题翻译：预编码和SDMA支持
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。

6. 发明申请

US20060233131A1 Channel quality reporting for adaptive sectorization 有权
标题翻译：渠道质量报告适应部门化
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。

7. 发明申请

US20070133668A1 AVERAGE-TAP ENERGY BASED THRESHOLDING FOR CHANNEL ESTIMATION IN MULTI ANTENNA SYSTEMS 有权
标题翻译：用于多天线系统中通道估计的平均能量能量阈值
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。

8. 发明申请

US20070041457A1 Method and apparatus for providing antenna diversity in a wireless communication system 审中-公开
标题翻译：在无线通信系统中提供天线分集的方法和装置
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。

9. 发明申请

US20060286974A1 Adaptive sectorization in cellular systems 有权
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.

10. 发明申请

US20050195763A1 Pilot transmission and channel estimation for MISO and MIMO receivers in a multi-antenna system 有权
标题翻译：多天线系统中MISO和MIMO接收机的导频传输和信道估计
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。

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