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1. 发明授权

US08428162B2 System and method for distributed input distributed output wireless communications 有权
标题翻译：分布式输入分布式输出无线通信系统和方法
公开(公告)号：US08428162B2
公开(公告)日：2013-04-23
申请号：US12637643
申请日：2009-12-14
申请人： Antonio Forenza , Robert W. Heath, Jr. , Stephen G. Perlman , Roger van der Laan , John Speck
发明人： Antonio Forenza , Robert W. Heath, Jr. , Stephen G. Perlman , Roger van der Laan , John Speck
IPC分类号： H04K1/10 , H04L27/28
CPC分类号： H04L25/03343 , H04B7/0684 , H04L1/0057 , H04L25/0206 , H04L25/0224 , H04L2025/03414 , H04L2025/0377 , H04L2025/03802
摘要： A system for compensating for in-phase and quadrature (I/Q) imbalances for multiple antenna systems (MAS) with multi-user (MU) transmissions (defined with the acronym MU-MAS), such as distributed-input distributed-output (DIDO) communication systems, comprising multicarrier modulation, such as orthogonal frequency division multiplexing (OFDM). For example, one embodiment of the system comprises one or more coding modulation units to encode and modulate information bits for each of a plurality of wireless client devices to produce encoded and modulated information bits; one or more mapping units to map the encoded and modulated information bits to complex symbols; and a MU-MAS or DIDO IQ-aware precoding unit to exploit channel state information obtained through feedback from the wireless client devices to compute MU-MAS or DIDO IQ-aware precoding weights, the MU-MAS or DIDO IQ-aware precoding unit precoding the complex symbols obtained from the mapping units using the weights to pre-cancel interference due to I/Q gain and phase imbalances and/or inter-user interference.
摘要翻译：用于补偿具有多用户（MU）传输（用首字母缩略词MU-MAS定义）的多天线系统（MAS）的同相和正交（I / Q）不平衡的系统，例如分布式输入分布式输出（ DIDO）通信系统，包括多载波调制，例如正交频分复用（OFDM）。例如，系统的一个实施例包括一个或多个编码调制单元，以编码和调制多个无线客户端设备中的每一个的信息比特，以产生编码和调制的信息比特; 一个或多个映射单元将编码和调制的信息比特映射到复数符号; 以及MU-MAS或DIDO IQ感知预编码单元，以利用通过来自无线客户端设备的反馈获得的信道状态信息来计算MU-MAS或DIDO IQ感知预编码权重，MU-MAS或DIDO IQ感知预编码单元预编码从映射单元获得的复数符号使用权重来预先消除由于I / Q增益和相位不平衡和/或用户间干扰引起的干扰。

2. 发明授权

US07633994B2 System and method for distributed input-distributed output wireless communications 有权
标题翻译：分布式输入分布式输出无线通信系统和方法
公开(公告)号：US07633994B2
公开(公告)日：2009-12-15
申请号：US11894362
申请日：2007-08-20
申请人： Antonio Forenza , Robert W. Heath, Jr. , Stephen G. Perlman , Roger van der Laan , John Speck
发明人： Antonio Forenza , Robert W. Heath, Jr. , Stephen G. Perlman , Roger van der Laan , John Speck
IPC分类号： H04L27/30
CPC分类号： H04L25/03343 , H04B7/0684 , H04L1/0057 , H04L25/0206 , H04L25/0224 , H04L2025/03414 , H04L2025/0377 , H04L2025/03802
摘要： A system for compensating for in-phase and quadrature (I/Q) imbalances for multiple antenna systems (MAS) with multi-user (MU) transmissions (defined with the acronym MU-MAS), such as distributed-input distributed-output (DIDO) communication systems, comprising multicarrier modulation, such as orthogonal frequency division multiplexing (OFDM). For example, one embodiment of the system comprises one or more coding modulation units to encode and modulate information bits for each of a plurality of wireless client devices to produce encoded and modulated information bits; one or more mapping units to map the encoded and modulated information bits to complex symbols; and a MU-MAS or DIDO IQ-aware precoding unit to exploit channel state information obtained through feedback from the wireless client devices to compute MU-MAS or DIDO IQ-aware precoding weights, the MU-MAS or DIDO IQ-aware preceding unit precoding the complex symbols obtained from the mapping units using the weights to pre-cancel interference due to I/Q gain and phase imbalances and/or inter-user interference.
摘要翻译：用于补偿具有多用户（MU）传输（用首字母缩略词MU-MAS定义）的多天线系统（MAS）的同相和正交（I / Q）不平衡的系统，例如分布式输入分布式输出（ DIDO）通信系统，包括多载波调制，例如正交频分复用（OFDM）。例如，系统的一个实施例包括一个或多个编码调制单元，以编码和调制多个无线客户端设备中的每一个的信息比特，以产生编码和调制的信息比特; 一个或多个映射单元将编码和调制的信息比特映射到复数符号; 以及MU-MAS或DIDO IQ感知预编码单元，以利用通过来自无线客户端设备的反馈获得的信道状态信息来计算MU-MAS或DIDO IQ感知预编码权重，MU-MAS或DIDO IQ感知前一单元预编码从映射单元获得的复数符号使用权重来预先消除由于I / Q增益和相位不平衡和/或用户间干扰引起的干扰。

3. 发明授权

US07636381B2 System and method for distributed input-distributed output wireless communications 有权
标题翻译：分布式输入分布式输出无线通信系统和方法
公开(公告)号：US07636381B2
公开(公告)日：2009-12-22
申请号：US11894540
申请日：2007-08-20
申请人： Antonio Forenza , Robert W. Heath, Jr. , Stephen G. Perlman , Roger van der Laan , John Speck
发明人： Antonio Forenza , Robert W. Heath, Jr. , Stephen G. Perlman , Roger van der Laan , John Speck
IPC分类号： H04L27/30
CPC分类号： H04L25/03343 , H04B7/0684 , H04L1/0057 , H04L25/0206 , H04L25/0224 , H04L2025/03414 , H04L2025/0377 , H04L2025/03802
摘要： A system for dynamically adapting the communication characteristics of a multiple antenna system (MAS) with multi-user (MU) transmissions (defined with the acronym MU-MAS), such as a distributed-input distributed-output (DIDO) communication system. For example, a system according to one embodiment of the invention comprises: one or more coding modulation units to encode and modulate information bits for each of a plurality of wireless client devices to produce encoded and modulated information bits; one or more mapping units to map the encoded and modulated information bits to complex symbols; and a MU-MAS or DIDO configurator unit to determine a subset of users and a MU-MAS or DIDO transmission mode based on channel characterization data obtained through feedback from the wireless client devices and to responsively control the coding modulation units and mapping units.
摘要翻译：一种用于通过多用户（MU）传输（由首字母缩略词MU-MAS定义）（例如分布式输入分布式输出（DIDO）通信系统）动态地适应多天线系统（MAS）的通信特性的系统。例如，根据本发明的一个实施例的系统包括：一个或多个编码调制单元，用于编码和调制多个无线客户端设备中的每一个的信息比特以产生编码和调制的信息比特; 一个或多个映射单元将编码和调制的信息比特映射到复数符号; 以及MU-MAS或DIDO配置器单元，用于基于通过来自无线客户端设备的反馈获得的信道表征数据来确定用户子集和MU-MAS或DIDO传输模式，并且响应地控制编码调制单元和映射单元。

4. 发明授权

US07599420B2 System and method for distributed input distributed output wireless communications 有权
标题翻译：分布式输入分布式输出无线通信系统和方法
公开(公告)号：US07599420B2
公开(公告)日：2009-10-06
申请号：US11894394
申请日：2007-08-20
申请人： Antonio Forenza , Robert W. Heath, Jr. , Stephen G. Perlman , Roger van der Laan , John Speck
发明人： Antonio Forenza , Robert W. Heath, Jr. , Stephen G. Perlman , Roger van der Laan , John Speck
IPC分类号： H04L27/30
CPC分类号： H04L25/03343 , H04B7/0452 , H04B7/0632 , H04B7/0684 , H04B7/0689 , H04B7/10 , H04J11/0033 , H04L1/0057 , H04L25/0206 , H04L25/0224 , H04L27/0014 , H04L27/2646 , H04L27/2657 , H04L27/2675 , H04L2025/03414 , H04L2025/03426 , H04L2025/0377 , H04L2025/03802 , H04L2027/002
摘要： A system and method are described for compensating for frequency and phase offsets in a multiple antenna system (MAS) with multi-user (MU) transmissions (“MU-MAS”). For example, a method according to one embodiment of the invention comprises: transmitting a training signal from each antenna of a base station to one or each of a plurality of wireless client devices, one or each of the client devices analyzing each training signal to generate frequency offset compensation data, and receiving the frequency offset compensation data at the base station; computing MU-MAS precoder weights based on the frequency offset compensation data to pre-cancel the frequency offset at the transmitter; precoding training signal using the MU-MAS precoder weights to generate precoded training signals for each antenna of the base station; transmitting the precoded training signal from each antenna of a base station to each of a plurality of wireless client devices, each of the client devices analyzing each training signal to generate channel characterization data, and receiving the channel characterization data at the base station; computing a plurality of MU-MAS precoder weights based on the channel characterization data, the MU-MAS precoder weights calculated to pre-cancel frequency and phase offset and/or inter-user interference; precoding data using the MU-MAS precoder weights to generate precoded data signals for each antenna of the base station; and transmitting the precoded data signals through each antenna of the base station to each respective client device.
摘要翻译：描述了用于补偿具有多用户（MU）传输（“MU-MAS”）的多天线系统（MAS）中的频率和相位偏移的系统和方法。例如，根据本发明的一个实施例的方法包括：将来自基站的每个天线的训练信号发送到多个无线客户端设备中的一个或每个无线客户端设备，一个或每个客户端设备分析每个训练信号以产生频偏补偿数据，并在基站接收频偏补偿数据; 基于所述频偏补偿数据计算MU-MAS预编码器权重以预先消除所述发射机处的频偏; 使用MU-MAS预编码器权重的预编码训练信号来生成基站的每个天线的预编码训练信号; 将预编码的训练信号从基站的每个天线发送到多个无线客户端设备中的每一个，每个客户端设备分析每个训练信号以产生信道表征数据，以及在基站处接收信道表征数据; 基于所述信道表征数据计算多个MU-MAS预编码器权重，所述MU-MAS预编码器权重被计算为预先消除频率和相位偏移和/或用户间干扰; 使用MU-MAS预编码器权重预编码数据，以生成基站的每个天线的预编码数据信号; 以及通过基站的每个天线将预编码的数据信号发送到每个相应的客户机设备。

5. 发明授权

US08160121B2 System and method for distributed input-distributed output wireless communications 有权
标题翻译：分布式输入分布式输出无线通信系统和方法
公开(公告)号：US08160121B2
公开(公告)日：2012-04-17
申请号：US12143503
申请日：2008-06-20
申请人： Antonio Forenza , Robert W. Heath, Jr. , Stephen G. Perlman
发明人： Antonio Forenza , Robert W. Heath, Jr. , Stephen G. Perlman
IPC分类号： H04L27/30
CPC分类号： H04L25/03343 , H04B7/0626 , H04B7/0684 , H04L1/0003 , H04L1/0009 , H04L1/0026 , H04L1/007 , H04L25/0206 , H04L25/0224 , H04L2025/03414 , H04L2025/0377 , H04L2025/03802
摘要： A system and method are described for dynamically adapting the communication characteristics of a multiple antenna system (MAS) with multi-user (MU) transmissions (“MU-MAS”). For example, a method according to one embodiment of the invention comprises: transmitting a training signal from each antenna of a base station to each of a plurality of wireless client devices, each of the client devices analyzing each training signal to generate channel characterization data, and receiving the channel characterization data at the base station; computing a plurality of MU-MAS precoder weights based on the channel characterization data, the combined MU-MAS precoder weights comprising a MU-MAS channel matrix; determining instantaneous or statistical channel quality (“link quality metric”) for the wireless client devices using mutual information of MU-MAS links or singular values of the MU-MAS composite channel matrix; determining a subset of users and a MU-MAS transmission mode based on the link quality metric; precoding data using the MU-MAS precoder weights to generate precoded data signals for each antenna of the base station; and transmitting the precoded data signals through each antenna of the base station to each respective client device within the selected subset.
摘要翻译：描述了一种用于动态地适应具有多用户（MU）传输（MU-MAS）的多天线系统（MAS）的通信特性的系统和方法。例如，根据本发明的一个实施例的方法包括：将训练信号从基站的每个天线发送到多个无线客户端设备中的每一个，每个客户机设备分析每个训练信号以产生信道表征数据，以及在所述基站处接收所述信道表征数据; 基于所述信道特征数据计算多个MU-MAS预编码器权重，所述组合的MU-MAS预编码器权重包括MU-MAS信道矩阵; 使用MU-MAS链路的互信息或MU-MAS复合信道矩阵的奇异值来确定无线客户端设备的即时或统计信道质量（“链路质量度量”）; 基于所述链路质量度量来确定用户的子集和MU-MAS传输模式; 使用MU-MAS预编码器权重预编码数据，以生成基站的每个天线的预编码数据信号; 以及将预编码的数据信号通过基站的每个天线发送到所选择的子集内的每个相应的客户机设备。

6. 发明授权

US08130862B2 Precoding system and method for multi-user transmission in multiple antenna wireless systems 有权
标题翻译：多天线无线系统中多用户传输的预编码系统及方法
公开(公告)号：US08130862B2
公开(公告)日：2012-03-06
申请号：US11791090
申请日：2005-11-16
申请人： Antonio Forenza , Robert W. Heath, Jr. , Manish Airy
发明人： Antonio Forenza , Robert W. Heath, Jr. , Manish Airy
IPC分类号： H04B7/00 , H03K9/00 , H04L27/06 , H04L7/00
CPC分类号： H04L27/367 , H04B7/022 , H04B7/0417 , H04B7/0443 , H04B7/0465
摘要： A transmission method and system are provided wherein the system and method use precoding and sum rate optimization beam forming to create a capacity transmission.
摘要翻译：提供了一种传输方法和系统，其中系统和方法使用预编码和和速率优化波束形成来创建容量传输。

7. 发明授权

US07921349B2 Mode selection for data transmission in wireless communication channels based on statistical parameters 有权
标题翻译：基于统计参数的无线通信信道数据传输模式选择
公开(公告)号：US07921349B2
公开(公告)日：2011-04-05
申请号：US12823267
申请日：2010-06-25
申请人： David J. Gesbert , Severine E. Catreux , Robert W. Heath, Jr. , Peroor K. Sebastian , Arogyaswami J. Paulraj
发明人： David J. Gesbert , Severine E. Catreux , Robert W. Heath, Jr. , Peroor K. Sebastian , Arogyaswami J. Paulraj
IPC分类号： H03M13/00
CPC分类号： H04L1/06 , H04L1/0001 , H04L1/0002 , H04L1/0009 , H04L1/0016 , H04L1/0021 , H04L1/0026 , H04L1/0033 , H04L1/20
摘要： A method and communication system for selecting a mode for encoding data for transmission in a wireless communication channel between a transmit unit and a receive unit. The data is initially transmitted in an initial mode and the selection of the subsequent mode is based on a selection of first-order and second-order statistical parameters of short-term and long-term quality parameters. Suitable short-term quality parameters include signal-to-interference and noise ratio (SINR), signal-to-noise ratio (SNR), power level and suitable long-term quality parameters include error rates such as bit error rate (BER) and packet error rate (PER). The method of the invention can be employed in Multiple Input. Multiple Output (MIMO), Multiple Input Single Output (MISO), Single Input Single Output (SISO) and Single Input Multiple Output (SIMO) communication systems to make subsequent mode selection faster and more efficient. Furthermore the method can be used in communication systems employing various transmission protocols including OFDMA, FDMA, CDMA, TDMA.
摘要翻译：一种用于选择用于在发送单元和接收单元之间的无线通信信道中进行数据传输的模式的方法和通信系统。最初以初始模式发送数据，并且随后的模式的选择是基于对短期和长期质量参数的一阶和二阶统计参数的选择。合适的短期质量参数包括信噪比和噪声比（SINR），信噪比（SNR），功率电平和合适的长期质量参数，包括错误率，如误码率（BER）和数据包错误率（PER）。本发明的方法可以用于多输入。多输出（MIMO），多输入单输出（MISO），单输入单输出（SISO）和单输入多输出（SIMO）通信系统，使后续模式选择更快更有效。此外，该方法可以用于采用包括OFDMA，FDMA，CDMA，TDMA的各种传输协议的通信系统。

8. 发明授权

US07676007B1 System and method for interpolation based transmit beamforming for MIMO-OFDM with partial feedback 有权
标题翻译：用于具有部分反馈的MIMO-OFDM的基于插值的发射波束成形的系统和方法
公开(公告)号：US07676007B1
公开(公告)日：2010-03-09
申请号：US11188233
申请日：2005-07-21
申请人： Jihoon Choi , Robert W. Heath, Jr.
发明人： Jihoon Choi , Robert W. Heath, Jr.
IPC分类号： H04B7/08
CPC分类号： H04B7/0617 , H04B7/0634 , H04B7/066 , H04L5/0007 , H04L5/0023 , H04L5/0028 , H04L5/006
摘要： Transmit beamforming with receive combining uses the significant diversity provided by multiple-input multiple-output (MIMO) systems, and the use of orthogonal frequency division multiplexing (OFDM) enables low complexity implementation of this scheme over frequency selective MIMO channels. Optimal beamforming uses channel state information in the form of the beamforming vectors corresponding to all the OFDM subcarriers. In non-reciprocal channels, this information should be conveyed back to the transmitter. To reduce the amount of feedback information, transmit beamforming combines limited feedback and beamformer interpolation. In this architecture, the receiver sends back a fraction of information about the beamforming vectors to the transmitter, and the transmitter computes the beamforming vectors for all subcarriers through interpolation of the conveyed beamforming vectors. Since a beamforming vector is phase invariant and has unit norm, a linear spherical interpolator uses additional parameters for phase rotation. These parameters are determined at the receiver in the sense of maximizing the minimum channel gain or capacity. The interpolator maybe combined with beamformer quantization.
摘要翻译：具有接收组合的发射波束成形使用由多输入多输出（MIMO）系统提供的显着分集，并且正交频分复用（OFDM）的使用使得能够在频率选择性MIMO信道上实现该方案的低复杂度。最优波束成形以对应于所有OFDM子载波的波束成形向量的形式使用信道状态信息。在非互惠渠道中，这些信息应该传回给发射机。为了减少反馈信息的数量，传输波束成形结合了有限的反馈和波束形成器插值。在该架构中，接收机向发射机发送关于波束成形向量的一部分信息，并且发射机通过所传送的波束形成向量的内插来计算所有子载波的波束成形向量。由于波束形成向量是相位不变的并且具有单位范数，所以线性球形插值器使用附加参数进行相位旋转。在最大化最小通道增益或容量的意义上，在接收器处确定这些参数。内插器可以与波束形成器量化组合。

9. 发明授权

US07058146B2 Method and wireless communications systems using coordinated transmission and training for interference mitigation 失效
公开(公告)号：US07058146B2
公开(公告)日：2006-06-06
申请号：US09876896
申请日：2001-06-06
申请人： Arogyaswami J. Paulraj , Peroor K. Sebastian , Jose Tellado , Robert W. Heath, Jr.
发明人： Arogyaswami J. Paulraj , Peroor K. Sebastian , Jose Tellado , Robert W. Heath, Jr.
IPC分类号： H04L1/02 , H04B7/10
CPC分类号： H04B7/0842 , H04B7/086 , H04L1/06
摘要： A method for interference mitigation in a wireless communication system having multiple transmitters and receivers by introducing transmission time delays between the transmission of signals from the individual transmitters to ensure coherent reception of the signals at a specific point in the coverage area, such as at a center of distribution of the receivers. To further aid in interference mitigation the signals are assigned training patterns chosen to be distinguishable by the receiver and to optimize interference mitigation. The training patterns can be selected based on a feedback parameter, e.g., a measure of the quality of interference mitigation obtained from the receiver. The present method can be used in wireless communication systems which re-use frequencies including TDMA, CDMA, FDMA, OFDMA or other multiplex communication systems using a multiple access method or a combination of such methods.

10. 发明授权

US06937592B1 Wireless communications system that supports multiple modes of operation 失效
公开(公告)号：US06937592B1
公开(公告)日：2005-08-30
申请号：US09653060
申请日：2000-09-01
申请人： Robert W. Heath, Jr. , Rajeev Krishnamoorthy , Peroor K. Sebastian , Arogyaswami J. Paulraj
发明人： Robert W. Heath, Jr. , Rajeev Krishnamoorthy , Peroor K. Sebastian , Arogyaswami J. Paulraj
IPC分类号： H04B7/212 , H04B7/216 , H04L12/56
CPC分类号： H04W72/042 , H04W16/14 , H04W24/00 , H04W24/10 , H04W48/18 , H04W72/0413 , H04W88/06
摘要： A wireless communications adapts its mode of operation between spatial multiplexing and non-spatial multiplexing in response to transmission-specific variables. An embodiment of a wireless communications system for transmitting information between a base transceiver station and a subscriber unit includes mode determination logic. The mode determination logic is in communication with the base transceiver station and the subscriber unit. The mode determination logic determines, in response to a received signal, if a subscriber datastream should be transmitted between the base transceiver station and the subscriber unit utilizing spatial multiplexing or non-spatial multiplexing. In an embodiment, the mode determination logic has an input for receiving a measure of a transmission characteristic related to the received signal. In an embodiment, the mode determination logic includes logic for comparing the measured transmission characteristic to a transmission characteristic threshold and for selecting one of spatial multiplexing and non-spatial multiplexing in response to the comparison of the measured transmission characteristic to the transmission characteristic threshold. In an embodiment, the transmission characteristic includes at least one of delay spread, post-processing signal-to-noise ratio, cyclical redundancy check (CRC) failure, residual inter-symbol interference, mean square error, coherence time, and path loss. By adapting the mode of operation in response to transmission-specific variables, the use of spatial multiplexing can be discontinued in unfavorable conditions. Additionally, because the wireless communications system can adapt its mode of operation between spatial multiplexing and non-spatial multiplexing, the communications system is compatible with both subscriber units that support spatial multiplexing and subscriber units that do not support spatial multiplexing.

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