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11.发明申请METHOD AND APPARATUS FOR ANTENNA DIVERSITY IN MULTI-INPUT MULTI-OUTPUT COMMUNICATION SYSTEMS 有权多输入多输出通信系统中天线多样性的方法与装置公开(公告)号：US20120140838A1
公开(公告)日：2012-06-07
申请号：US13271113
申请日：2011-10-11
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。
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12.发明授权Average-tap energy based thresholding for channel estimation in multi antenna systems 有权用于多天线系统中信道估计的平均抽头能量阈值公开(公告)号：US08107517B2
公开(公告)日：2012-01-31
申请号：US11560735
申请日：2006-11-16
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。
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公开(公告)号：US20080112495A1
公开(公告)日：2008-05-15
申请号：US11873375
申请日：2007-10-16
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。
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公开(公告)号：US07418046B2
公开(公告)日：2008-08-26
申请号：US11022146
申请日：2004-12-22
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。
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公开(公告)号：US07145940B2
公开(公告)日：2006-12-05
申请号：US10890718
申请日：2004-07-13
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.
摘要翻译： 描述了用于多天线通信系统的有效导频传输方案。 通常，MISO接收机优选在一个空间方向上发送的导频，并且MIMO接收机通常需要在不同空间方向上发送的导频。 在一个导频传输方案中，用第一训练向量生成第一组T比例导频符号，并从T个发射天线发射（例如，连续地），其中T> 1。 如果MIMO接收机将被系统支持，则至少T-1个额外的T比例导频符号集合至少产生T-1个附加训练向量并从T个发射天线发射。 训练矢量用于不同的（例如正交的）空间方向。 每个MISO接收机可以基于第一组缩放的导频符号来估计其MISO信道。 每个MIMO接收机可以基于第一个和额外的缩放导频符号集来估计其MIMO信道。
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公开(公告)号：US09172453B2
公开(公告)日：2015-10-27
申请号：US11261064
申请日：2005-10-27
申请人： Jibing Wang , Tamer Kadous , Dhananjay Ashok Gore
发明人： Jibing Wang , Tamer Kadous , Dhananjay Ashok Gore
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。
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17.发明授权Method and apparatus for pilot communication in a multi-antenna wireless communication system 有权用于多天线无线通信系统中的导频通信的方法和装置公开(公告)号：US08139672B2
公开(公告)日：2012-03-20
申请号：US11390622
申请日：2006-03-27
申请人： Dhananjay Ashok Gore , Tingfang Ji , Tamer Kadous
发明人： Dhananjay Ashok Gore , Tingfang Ji , Tamer Kadous
IPC分类号： H04L27/00
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。
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18.发明授权Pilot transmission and channel estimation for MISO and MIMO receivers in a multi-antenna system 有权多天线系统中MISO和MIMO接收机的导频传输和信道估计公开(公告)号：US08077691B2
公开(公告)日：2011-12-13
申请号：US11020888
申请日：2004-12-22
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。
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19.发明授权公开(公告)号：US08095166B2
公开(公告)日：2012-01-10
申请号：US12055264
申请日：2008-03-25
IPC分类号： H04B7/00
CPC分类号： H04W52/16 , H04W52/08 , H04W52/10 , H04W52/146 , H04W52/325
摘要： Aspects describe controlling a power level for an access terminal in a wireless communication system that utilizes multiple modulation waveforms. The power can be controlled after an Access Grant is received in response to an Access Probe until the mobile device transitions into a steady state. A reference power can be continuously monitored and a setting of a power amplifier can be modified only when the reference power changes. A digital gain of a reverse data channel can be adjusted relative to the reference power level.
摘要翻译： 方面描述了在利用多个调制波形的无线通信系统中控制接入终端的功率电平。 在接收到访问准则后，可以控制功率，直到移动设备转换到稳定状态。 可以连续地监视参考功率，并且仅当参考功率改变时才能修改功率放大器的设置。 可以相对于参考功率电平调整反向数据通道的数字增益。
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公开(公告)号：US20110026567A1
公开(公告)日：2011-02-03
申请号：US12510474
申请日：2009-07-28
IPC分类号： H04B1/38
CPC分类号： H04B1/525 , H04B1/0032
摘要： A method for detecting and reducing aliasing is described. The method may be implemented by a first wireless device. A first signal may be transmitted on a first frequency channel. A second signal may be received on a second frequency channel. The second signal may be received concurrently with the transmission of the first signal. Aliasing of the first signal on the second signal may be detected. Aliasing may be reduced.
摘要翻译： 描述了一种用于检测和减少混叠的方法。 该方法可以由第一无线设备来实现。 可以在第一频率信道上发送第一信号。 可以在第二频率信道上接收第二信号。 可以与第一信号的传输同时接收第二信号。 可以检测第二信号上的第一信号的混叠。 混淆可能会减少。
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