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11. 发明申请

US20130242841A1 Channel Feedback In OFDM Systems 有权
标题翻译： OFDM系统中的信道反馈
公开(公告)号：US20130242841A1
公开(公告)日：2013-09-19
申请号：US13419592
申请日：2012-03-14
申请人： Xiao-an Wang
发明人： Xiao-an Wang
IPC分类号： H04W72/00
CPC分类号： H04W72/005 , H04L5/00 , H04L5/0023 , H04L5/0035 , H04L5/0048 , H04L25/022 , H04L25/0224
摘要： Methods and apparatus of channel feedback are disclosed. In OFDM systems, the channel is acquired in the frequency domain. A generic multipath model for wireless channels, however, reveals that the time-domain parameters of the channel require much smaller data than the frequency-domain representation of the channel. Means to extracting the time-domain parameters from the frequency-domain channel samples are described for both the continuous time domain and the discrete time domain. Refinements of the time-domain parameters via minimizing a frequency-domain matching error are also described, which further improve the quality of the channel feedback and reduce the feedback overhead. Channel feedback with the time-domain parameters requires only a small fraction of the feedback overhead that is needed by existing channel feedback schemes, and maintains consistently superior performances over wireless channels of various delay spreads, short or long.
摘要翻译：公开了信道反馈的方法和装置。在OFDM系统中，在频域中获取信道。然而，用于无线信道的通用多径模型揭示了信道的时域参数需要比信道的频域表示少得多的数据。对于连续时域和离散时域都描述了从频域信道样本中提取时域参数的手段。还描述了通过最小化频域匹配误差来改进时域参数，这进一步提高了信道反馈的质量并减少了反馈开销。具有时域参数的信道反馈仅需要现有信道反馈方案所需的反馈开销的一小部分，并且在短时间或长的各种延迟传播的无线信道上保持一致的优异性能。

12. 发明申请

US20130083778A1 Wideband Analog Channel Information Feedback 有权
标题翻译：宽带模拟频道信息反馈
公开(公告)号：US20130083778A1
公开(公告)日：2013-04-04
申请号：US13249238
申请日：2011-09-30
申请人： Xiao-an Wang
发明人： Xiao-an Wang
IPC分类号： H04W40/00 , H04W92/00 , H04L27/28 , H04B7/216
CPC分类号： H04L1/0027 , H04L1/0026 , H04L1/04 , H04L25/0228 , H04L2001/0093
摘要： Multipoint broadcasting requires that the downlink-channel information be available at collaborating base stations. Methods and apparatus for wideband analog channel feedback are described that provide downlink-channel information feedback from mobile users to base stations via uplink channels, and that use very few or no resources of the RAT of the wireless cellular network. Also described are methods and apparatus that perform channel-feedback signal cancellation at base stations to reduce its interference on the uplink-traffic signal. Wideband analog channel feedback is adaptable to the feedback bandwidth in uplink, and it offers frequency diversity to combat the deep fading in feedback channels. Wideband analog channel feedback is also applicable to uplink channel-information feedback. Applications of the described methods and apparatus include multipoint broadcasting in a wireless cellular network, and more generally, channel feedback between two communicating devices in a communications network.
摘要翻译：多点广播需要下行链路信道在协作基站可用。描述了用于宽带模拟信道反馈的方法和装置，其通过上行链路信道从移动用户向基站提供下行链路信道信息反馈，并且使用无线蜂窝网络的RAT的很少或没有资源。还描述了在基站执行信道反馈信号消除以减少其对上行链路业务信号的干扰的方法和装置。宽带模拟信道反馈适用于上行链路的反馈带宽，并提供频率分集以抵御反馈信道的深度衰落。宽带模拟信道反馈也适用于上行链路信道信息反馈。所描述的方法和装置的应用包括无线蜂窝网络中的多点广播，更一般地，在通信网络中的两个通信设备之间的信道反馈。

13. 发明申请

US20120320765A1 Carrier-Phase Difference Detection With Mismatched Transmitter And Receiver Delays 有权
标题翻译：载波相位差检测与不匹配的发射机和接收机延迟
公开(公告)号：US20120320765A1
公开(公告)日：2012-12-20
申请号：US13163725
申请日：2011-06-20
申请人： Xiao-an Wang
发明人： Xiao-an Wang
IPC分类号： H04W24/00
CPC分类号： H04L25/0228 , H04L25/022 , H04L25/0222 , H04L25/0232 , H04W56/0035
摘要： Methods and apparatus are described that provide efficient detection of the carrier-phase difference (CPD) between communicating devices over the entire signal bandwidth. The CPD detection utilizes the linear structure of the CPD, which eliminates most of the feedback overhead. Both feedback mechanisms, compact digitized feedback, and feedback via fast signaling protocols, are described. The CPD can be decomposed into a fixed/slow-changing portion and a fast-varying portion, with the former being pre-calibrated and communicated prior to communications sessions, thus further reducing the feedback overhead and improving the CPD detection accuracy. The nonlinearity in the TX/RX chains can also be pre-calibrated, allowing CPDs with more general structures to be detected by methods that detect CPDs with linear structures. Applications of the described methods and apparatus include wireless multipoint broadcast systems, also known as coordinated multipoint transmission, or CoMP, in LTE-A (long-term evolution, advanced) systems, and frequency and phase synchronization of a cluster of base stations.
摘要翻译：描述了在整个信号带宽上提供通信设备之间的载波相位差（CPD）的有效检测的方法和装置。 CPD检测利用CPD的线性结构，消除了大部分的反馈开销。描述了反馈机制，紧凑型数字化反馈和通过快速信令协议的反馈。 CPD可以分解为固定/慢变化部分和快速变化部分，前者在通信会话之前被预校准和通信，从而进一步减少反馈开销并提高CPD检测精度。 TX / RX链中的非线性也可以被预校准，允许通过用线性结构检测CPD的方法来检测具有更一般结构的CPD。所描述的方法和装置的应用包括LTE-A（长期演进，高级）系统中的无线多点广播系统，也称为协调多点传输，或CoMP，以及基站簇的频率和相位同步。

14. 发明授权

US08175562B2 Automatic gain control for enhanced bit error rate performance 有权
标题翻译：自动增益控制可提高误码率性能
公开(公告)号：US08175562B2
公开(公告)日：2012-05-08
申请号：US11553635
申请日：2006-10-27
申请人： Roger A. Fratti , Xiao-an Wang
发明人： Roger A. Fratti , Xiao-an Wang
IPC分类号： H04B1/06
CPC分类号： H03G3/3068
摘要： An apparatus including automatic gain control (AGC) includes at least one variable gain amplifier (VGA) operative to receive an input signal and to generate an amplified signal. A gain of the VGA is controlled as a function of at least a first control signal. The apparatus further includes an AGC circuit coupled to the VGA and being operative to generate the first control signal. The AGC circuit has a bandwidth that is controlled as a function of at least the amplified signal and a second control signal, the second control signal being indicative of a motion of the apparatus.
摘要翻译：包括自动增益控制（AGC）的装置包括至少一个可操作以接收输入信号并产生放大信号的可变增益放大器（VGA）。 VGA的增益被控制为至少第一控制信号的函数。该装置还包括耦合到VGA并可操作以产生第一控制信号的AGC电路。所述AGC电路具有作为至少所述放大信号和第二控制信号的功能的带宽，所述第二控制信号表示所述装置的运动。

15. 发明申请

US20120263222A1 Maximum-Likelihood MIMO Demodulation for Frequency-Selective Channels 有权
标题翻译：频率选择通道的最大似然MIMO解调
公开(公告)号：US20120263222A1
公开(公告)日：2012-10-18
申请号：US13087943
申请日：2011-04-15
申请人： Xiao-an Wang
发明人： Xiao-an Wang
IPC分类号： H04L27/06 , H04B1/10 , H04L27/01
CPC分类号： H04L25/0328 , H04L25/03292 , H04L25/03331 , H04L25/03891
摘要： A method is described that enables maximum-likelihood (ML) demodulation for MIMO communications over frequency-selective channels. An equalizer is typically employed to suppress inter-symbol interference (ISI) due to frequency-selectiveness of the channel, but the noise of the equalizer output can be highly correlated such that standard ML-MIMO demodulations cannot directly apply. The method comprises first constructing equivalent post-equalization MIMO channel and noise covariance matrix, and then de-correlating the equalizer output so that ML or near-ML MIMO demodulations can be applied to improve the performance. Additionally, successive ISI cancellation (SIC) is described for further performance improvement.
摘要翻译：描述了一种能够通过频率选择信道进行MIMO通信的最大似然（ML）解调的方法。通常采用均衡器来抑制由于信道的频率选择性引起的符号间干扰（ISI），但是均衡器输出的噪声可以高度相关，使得标准ML-MIMO解调不能直接应用。该方法包括首先构建等效的后均衡MIMO信道和噪声协方差矩阵，然后将均衡器输出去相关，使ML或近ML MIMO解调可以应用于提高性能。另外，为了进一步提高性能，描述了连续的ISI取消（SIC）。

16. 发明申请

US20120243424A1 CARRIER-PHASE DIFFERENCE DETECTION AND TRACKING IN MULTIPOINT BROADCAST CHANNELS 有权
标题翻译：多点广播频道中的载波相位差检测和跟踪
公开(公告)号：US20120243424A1
公开(公告)日：2012-09-27
申请号：US13052691
申请日：2011-03-21
申请人： Xiao-an Wang
发明人： Xiao-an Wang
IPC分类号： H04L12/26
CPC分类号： H04L25/03955 , H04B7/024 , H04B7/0626 , H04L5/0023 , H04L5/0035 , H04L5/0048 , H04L5/14 , H04L25/0204 , H04L25/0228 , H04L25/03904 , H04L27/2646 , H04L27/2657 , H04L27/2675 , H04L27/2695 , H04W24/00 , H04W48/08
摘要： Methods and apparatus are described that provide carrier-phase difference (CPD) acquisition via signaling protocols between communicating devices. The random CPD between two disjoint devices can be measured by the signaling protocols described herein. With the availability of the CPD, a device is also able to acquire its outgoing channel (transmit channel) information, thus avoiding the channel information feedback that is being considered and/or practiced in some wireless communications systems. Also described are methods and apparatus that use the CPD to synchronize the clocks of two or more devices and that track the time-variations of the CPD for reliable CPD measurement and tracking loop operations. Applications of the described methods and apparatus include wireless multipoint broadcast systems, also known as coordinated multipoint transmission, or CoMP, in LTE (long-term evolution)-advanced systems, point-to-point wireless MIMO systems, and general wireless device networks.
摘要翻译：描述了通过通信设备之间的信令协议来提供载波相位差（CPD）采集的方法和装置。可以通过本文描述的信令协议来测量两个不相交设备之间的随机CPD。随着CPD的可用性，设备还能够获取其输出信道（发送信道）信息，从而避免在某些无线通信系统中正在考虑和/或实践的信道信息反馈。还描述了使用CPD来同步两个或更多个设备的时钟并跟踪CPD的时间变化以用于可靠的CPD测量和跟踪循环操作的方法和装置。所描述的方法和装置的应用包括LTE（长期演进） - 高级系统，点对点无线MIMO系统和一般无线设备网络中的无线多点广播系统，也称为协调多点传输，或CoMP。

17. 发明授权

US07974997B2 Hardware matrix computation for wireless receivers 有权
标题翻译：无线接收机的硬件矩阵计算
公开(公告)号：US07974997B2
公开(公告)日：2011-07-05
申请号：US11731174
申请日：2007-03-30
申请人： Eliahou Arviv , Robert L. Lang , Yi-Chen Li , Oliver Ridler , Xiao-an Wang
发明人： Eliahou Arviv , Robert L. Lang , Yi-Chen Li , Oliver Ridler , Xiao-an Wang
IPC分类号： G06F17/16
CPC分类号： G06F17/16 , H04B1/707 , H04B2201/70707 , H04B2201/709727
摘要： In one embodiment, a receiver including one or more signal-processing blocks and a hardware-based matrix co-processor. The one or more signal-processing blocks are adapted to generate a processed signal from a received signal. The hardware-based matrix co-processor includes two or more different matrix-computation engines, each adapted to perform a different matrix computation, and one or more shared hardware-computation units, each adapted to perform a mathematical operation. At least one signal-processing block is adapted to offload matrix-based signal processing to the hardware-based matrix co-processor. Each of the two or more different matrix-computation engines is adapted to offload the same type of mathematical processing to at least one of the one or more shared hardware-computation units.
摘要翻译：在一个实施例中，接收机包括一个或多个信号处理块和基于硬件的矩阵协处理器。所述一个或多个信号处理块适于从接收到的信号产生经处理的信号。基于硬件的矩阵协处理器包括两个或更多个不同的矩阵计算引擎，每个矩阵计算引擎适于执行不同的矩阵计算，以及一个或多个共享硬件计算单元，每个共享硬件计算单元适于执行数学运算。至少一个信号处理块适于将基于矩阵的信号处理卸载到基于硬件的矩阵协处理器。两个或更多个不同的矩阵计算引擎中的每一个适于将相同类型的数学处理卸载到一个或多个共享硬件计算单元中的至少一个。

18. 发明申请

US20080243982A1 Hardware matrix computation for wireless receivers 有权
标题翻译：无线接收机的硬件矩阵计算
公开(公告)号：US20080243982A1
公开(公告)日：2008-10-02
申请号：US11731174
申请日：2007-03-30
申请人： Eliahou Arviv , Robert L. Lang , Yi-Chen Li , Oliver Ridler , Xiao-an Wang
发明人： Eliahou Arviv , Robert L. Lang , Yi-Chen Li , Oliver Ridler , Xiao-an Wang
IPC分类号： G06F17/10 , G06F7/32
CPC分类号： G06F17/16 , H04B1/707 , H04B2201/70707 , H04B2201/709727
摘要： In one embodiment, a receiver including one or more signal-processing blocks and a hardware-based matrix co-processor. The one or more signal-processing blocks are adapted to generate a processed signal from a received signal. The hardware-based matrix co-processor includes two or more different matrix-computation engines, each adapted to perform a different matrix computation, and one or more shared hardware-computation units, each adapted to perform a mathematical operation. At least one signal-processing block is adapted to offload matrix-based signal processing to the hardware-based matrix co-processor. Each of the two or more different matrix-computation engines is adapted to offload the same type of mathematical processing to at least one of the one or more shared hardware-computation units.
摘要翻译：在一个实施例中，接收机包括一个或多个信号处理块和基于硬件的矩阵协处理器。所述一个或多个信号处理块适于从接收到的信号产生经处理的信号。基于硬件的矩阵协处理器包括两个或更多个不同的矩阵计算引擎，每个矩阵计算引擎适于执行不同的矩阵计算，以及一个或多个共享硬件计算单元，每个共享硬件计算单元适于执行数学运算。至少一个信号处理块适于将基于矩阵的信号处理卸载到基于硬件的矩阵协处理器。两个或更多个不同的矩阵计算引擎中的每一个适于将相同类型的数学处理卸载到一个或多个共享硬件计算单元中的至少一个。

19. 发明申请

US20050152486A1 LMMSE-based rake receiver with channel tap assignment 有权
标题翻译：基于LMMSE的耙式接收机，具有通道分接分配
公开(公告)号：US20050152486A1
公开(公告)日：2005-07-14
申请号：US10754340
申请日：2004-01-09
申请人： Xiao-an Wang
发明人： Xiao-an Wang
IPC分类号： H03H7/30 , H03K5/159 , H04B1/10 , H04L1/06 , H04L1/20 , H04L25/03
CPC分类号： H04B1/712 , H04B2201/709727 , H04L1/20 , H04L25/03038 , H04L2025/03375 , H04L2025/03605 , H04L2025/03643
摘要： Methods of recovering data in a received signal sent in a communications media are disclosed. Composite channel impulse responses are first estimated. Channel-tap locations are then assigned to suppress the interference noises by sequential search schemes or heuristic search schemes based on estimated composite channel impulse responses. A sequential search scheme optimizes a predetermined design criterion in a sequential manner. Also described are recursive evaluations of the design criterion and the inverses of the noise covariance matrices based on the composite channel impulse response during a sequential search. A heuristic search scheme selects channel-tap locations based on a set of pre-selected channel-tap locations. The set of pre-selected channel-tap locations is determined according to the estimated composite channel impulse response. A method of estimating energy levels of known interference sources is also described.
摘要翻译：公开了在通信介质中发送的接收信号中恢复数据的方法。首先估计复合信道脉冲响应。然后分配频道抽头位置以通过基于估计的复合信道脉冲响应的顺序搜索方案或启发式搜索方案来抑制干扰噪声。顺序搜索方案以顺序方式优化预定的设计标准。还描述了基于在顺序搜索期间的复合信道脉冲响应的设计标准和噪声协方差矩阵的反演的递归评估。启发式搜索方案基于一组预先选择的频道抽头位置来选择频道抽头位置。根据估计的复合信道脉冲响应来确定预先选择的信道抽头位置集合。还描述了估计已知干扰源的能量水平的方法。

20. 发明授权

US06396411B1 Reliable and fast frame synchronization scheme for flex paging protocol 有权
标题翻译：灵活寻呼协议的可靠快速帧同步方案
公开(公告)号：US06396411B1
公开(公告)日：2002-05-28
申请号：US09244995
申请日：1999-02-04
申请人： Dwane A. Bell , Xiao-an Wang
发明人： Dwane A. Bell , Xiao-an Wang
IPC分类号： H04L700
CPC分类号： H04J3/0608 , H04W56/0085 , H04W68/00 , H04W88/02
摘要： A method and apparatus that utilizes soft outputs from a paging device demodulator to perform frame synchronization is provided. The soft outputs are summed after being correlated to a first pattern associated with a paging protocol. The summation is then compared to a frame synchronization threshold. Frame synchronization occurs when the summation reaches the threshold. Using soft outputs, and a summation of the outputs based on a correlation with the first pattern, the method and apparatus require less processing, are more efficient and are more reliable than conventional synchronization schemes.
摘要翻译：提供了利用来自寻呼装置解调器的软输出执行帧同步的方法和装置。软输出在与寻呼协议相关联的第一模式相关之后相加。然后将求和与帧同步阈值进行比较。当总和达到阈值时，发生帧同步。使用软输出和基于与第一模式的相关性的输出的总和，所述方法和装置需要较少的处理，比常规同步方案更有效并且更可靠。

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