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1. 发明授权

US08737540B1 System and method for providing reduced complexity maximum likelihood MIMO detection 有权
标题翻译：用于提供降低复杂度的最大似然MIMO检测的系统和方法
公开(公告)号：US08737540B1
公开(公告)日：2014-05-27
申请号：US13184464
申请日：2011-07-15
申请人： Kai Shi , Felix Bitterli , Richard Mosko , Tao-Fei Samuel Ng
发明人： Kai Shi , Felix Bitterli , Richard Mosko , Tao-Fei Samuel Ng
IPC分类号： H04L27/06
CPC分类号： H04L1/0047 , H04B7/0413 , H04L1/06 , H04L25/0204 , H04L25/0246 , H04L25/067
摘要： This disclosure is directed to wireless or wired multiple-input multiple-output communication systems, in which a transmit symbol vector and a set of soft decision metrics are estimated using a reduced complexity maximum likelihood (ML) detection method based on a receive symbol vector and a QR decomposition of a set of permuted channel matrices. The QR decomposition can be performed by a series of CORDIC operations. Preferably, the modified receive vector and upper triangular matrix streams are scaled by a weighting vector to help compensate for transmit and receive side noise. Also preferably, the soft decision metric set related to the reliability of transmitted bits is normalized.
摘要翻译：本公开涉及无线或有线多输入多输出通信系统，其中使用基于接收符号向量的降低的复杂度最大似然（ML）检测方法来估计发射符号向量和一组软判决度量，并且一组置换的信道矩阵的QR分解。 QR分解可以通过一系列CORDIC操作来执行。优选地，修改的接收向量和上三角矩阵流由加权向量缩放以帮助补偿发射和接收侧噪声。还优选地，与发送的比特的可靠性有关的软判决度量标准化。

2. 发明授权

US07693036B2 Decision feedback channel estimation and pilot tracking for OFDM systems 有权
标题翻译： OFDM系统的决策反馈信道估计和导频跟踪
公开(公告)号：US07693036B2
公开(公告)日：2010-04-06
申请号：US11150619
申请日：2005-06-10
申请人： Qinfang Sun , Won-Joon Choi , Jeffrey M. Gilbert , Ning Zhang , Yi-Hsiu Wang , Tao-Fei Samuel Ng
发明人： Qinfang Sun , Won-Joon Choi , Jeffrey M. Gilbert , Ning Zhang , Yi-Hsiu Wang , Tao-Fei Samuel Ng
IPC分类号： H04J11/00
CPC分类号： H04L25/022 , H04L25/0236 , H04L27/2647 , H04L2025/03522
摘要： Current OFDM systems use a limited number of symbols and/or sub-channels to provide approximations for channel estimations and pilot tracking, i.e. phase estimations. For example, two training symbols in the preamble of a data packet are used to provide channel estimation. Four of the fifty-four sub-channels are reserved for providing phase estimation. However, noise and other imperfections can cause errors in both of these estimations, thereby degrading system performance. Advantageously, decision feedback mechanisms can be provided to significantly improve channel estimation and pilot tracking in OFDM systems. The decision feedback mechanisms can use data symbols in the data packet to improve channel estimation as well as data sub-channels to improve pilot tracking.
摘要翻译：当前OFDM系统使用有限数量的符号和/或子信道来提供用于信道估计和导频跟踪（即相位估计）的近似。例如，使用数据分组的前导码中的两个训练符号来提供信道估计。五十四个子通道中的四个保留用于提供相位估计。然而，噪声和其他缺陷可能会导致这两种估计中的错误，从而降低系统性能。有利地，可以提供决策反馈机制以显着地改善OFDM系统中的信道估计和导频跟踪。决策反馈机制可以使用数据分组中的数据符号来改进信道估计以及数据子信道，以改进导频跟踪。

3. 发明授权

US07400733B1 Key refresh at the MAC layer 有权
标题翻译：密钥在MAC层刷新
公开(公告)号：US07400733B1
公开(公告)日：2008-07-15
申请号：US10086029
申请日：2002-02-27
申请人： Nancy Cam-Winget , Tao-Fei Samuel Ng , Kevin Hayes
发明人： Nancy Cam-Winget , Tao-Fei Samuel Ng , Kevin Hayes
IPC分类号： H04L29/08 , H04L29/00
CPC分类号： H04L63/06 , H04L2463/061
摘要： A method for encrypted communications between a first transceiver and a second transceiver is provided. The method includes sending from a first transceiver to a second transceiver a request to initiate derivation of a new encryption key. The request to initiate a new encryption key derivation includes an exchange threshold indicative of when the new encryption key is to be used to encrypt communication packets.
摘要翻译：提供了一种用于第一收发器和第二收发器之间的加密通信的方法。该方法包括从第一收发器向第二收发器发送启动新加密密钥的推导的请求。启动新的加密密钥导出的请求包括指示何时将使用新的加密密钥来加密通信分组的交换阈值。

4. 发明授权

US07098821B2 Receiving and transmitting signals having multiple modulation types using sequencing interpolator 有权
标题翻译：使用排序插值器接收和发送具有多种调制类型的信号
公开(公告)号：US07098821B2
公开(公告)日：2006-08-29
申请号：US10367527
申请日：2003-02-14
申请人： Paul J. Husted , Tao-Fei Samuel Ng
发明人： Paul J. Husted , Tao-Fei Samuel Ng
IPC分类号： H03M7/00
CPC分类号： H04L7/0029 , H04L25/05 , H04L27/0008
摘要： In a wireless local area network (WLAN), receiving or transmitting signals having multiple modulation schemes can require the use of multiple clock rates. Providing these multiple clock rates significantly increases silicon area and power consumption, both of which are highly undesirably in a wireless device. A sequencing interpolator can advantageously reduce the number of clock rates by receiving signals at a first rate and outputting signals at a second rate. The sequencing interpolator can include a multiplexer network that selectively determines which coefficients are applied to certain signals. Coefficients are chosen to ensure that an error in a frequency domain is within a given tolerance. The multiplexer network can be controlled by a counter value. At a predetermined count, the interpolated output signal is discarded and the counter is reset.
摘要翻译：在无线局域网（WLAN）中，具有多个调制方案的接收或发送信号可能需要使用多个时钟速率。提供这些多个时钟速率显着增加了硅面积和功耗，这两者在无线设备中都是非常不希望的。排序插值器可以有利地通过以第一速率接收信号并以第二速率输出信号来减少时钟速率的数量。排序插值器可以包括多路复用器网络，其选择性地确定哪些系数被应用于某些信号。选择系数以确保频域中的误差在给定的容限内。复用器网络可以通过计数器值来控制。在预定的计数时，内插的输出信号被丢弃并且计数器被复位。

5. 发明授权

US07039004B2 Decision feedback channel estimation and pilot tracking for OFDM systems 有权
标题翻译： OFDM系统的决策反馈信道估计和导频跟踪
公开(公告)号：US07039004B2
公开(公告)日：2006-05-02
申请号：US10263415
申请日：2002-10-01
申请人： Qinfang Sun , Won-Joon Choi , Jeffrey M. Gilbert , Ning Zhang , Yi-Hsiu Wang , Tao-Fei Samuel Ng
发明人： Qinfang Sun , Won-Joon Choi , Jeffrey M. Gilbert , Ning Zhang , Yi-Hsiu Wang , Tao-Fei Samuel Ng
IPC分类号： H04J11/00
CPC分类号： H04L25/022 , H04L25/0236 , H04L27/2647 , H04L2025/03522
摘要： Current OFDM systems use a limited number of symbols and/or sub-channels to provide approximations for channel estimations and pilot tracking, i.e. phase estimations. For example, two training symbols in the preamble of a data packet are used to provide channel estimation. Four of the fifty-four sub-channels are reserved for providing phase estimation. However, noise and other imperfections can cause errors in both of these estimations, thereby degrading system performance. Advantageously, decision feedback mechanisms can be provided to significantly improve channel estimation and pilot tracking in OFDM systems. The decision feedback mechanisms can use data symbols in the data packet to improve channel estimation as well as data sub-channels to improve pilot tracking.
摘要翻译：当前OFDM系统使用有限数量的符号和/或子信道来提供用于信道估计和导频跟踪（即相位估计）的近似。例如，使用数据分组的前导码中的两个训练符号来提供信道估计。五十四个子通道中的四个保留用于提供相位估计。然而，噪声和其他缺陷可能会导致这两种估计中的错误，从而降低系统性能。有利地，可以提供决策反馈机制以显着地改善OFDM系统中的信道估计和导频跟踪。决策反馈机制可以使用数据分组中的数据符号来改进信道估计以及数据子信道，以改进导频跟踪。

6. 发明授权

US06785523B2 Self-correlation detection in automatic gain calibration 有权
标题翻译：自相关检测自动增益校准
公开(公告)号：US06785523B2
公开(公告)日：2004-08-31
申请号：US09849595
申请日：2001-05-04
申请人： Paul Husted , Lars E. Thon , William McFarland , Tao Fei Samuel Ng
发明人： Paul Husted , Lars E. Thon , William McFarland , Tao Fei Samuel Ng
IPC分类号： H04B110
CPC分类号： H04B1/109 , H03G5/165 , H04B1/1036
摘要： An embodiment of the present invention provides an automatic gain control system for a wireless receiver that quickly differentiates desired in-band signals from high power out-of-band signals that overlap into the target band. The system measures power before and after passing a received signal through a pair of finite impulse response filters that largely restrict the signal's power to that which is in-band. By comparing the in-band energy of the received signal after filtering to the total signal energy prior to filtering, it is possible to determine whether a new in-band signal has arrived. The presence of this new in-band signal is then verified by a multi-threshold comparison of the normalized self-correlation to verify the presence of a new, desired in-band signal.
摘要翻译：本发明的实施例提供了一种用于无线接收机的自动增益控制系统，其快速地将期望的带内信号与重叠到目标频带中的高功率带外信号区分开来。该系统通过一对有限的脉冲响应滤波器测量接收信号之前和之后的功率，这些有限脉冲响应滤波器将信号功率大大限制在带内。通过将滤波后的接收信号的带内能量与滤波前的总信号能量进行比较，可以确定是否已经到达了新的带内信号。然后通过归一化自相关的多阈值比较来验证这个新的带内信号的存在，以验证新的期望的带内信号的存在。

7. 发明授权

US08121220B1 Apparatus and method for reduced complexity maximum likelihood MIMO detection 有权
标题翻译：降低复杂度最大似然MIMO检测的装置和方法
公开(公告)号：US08121220B1
公开(公告)日：2012-02-21
申请号：US12135054
申请日：2008-06-06
申请人： Kai Shi , Ning Zhang , Tao-Fei Samuel Ng
发明人： Kai Shi , Ning Zhang , Tao-Fei Samuel Ng
IPC分类号： H03K9/00 , H04L27/00
CPC分类号： H04L25/03197 , H04B7/0413 , H04L1/06 , H04L25/0246 , H04L25/03292 , H04L25/03318 , H04L2025/03426
摘要： In a multiple-input multiple-output communication system, a transmit symbol vector and a set of soft decision metrics may be estimated using a reduced complexity maximum likelihood (ML) detection method based on a receive symbol vector and a QR decomposition of a set of permuted channel matrices. The reduced complexity ML detection method may use a different permuted channel matrix to estimate each transmit symbol in a transmit symbol vector. A set of error distances may be calculated for the estimated transmit symbol vector, each error distance calculated choosing a different value from a signal constellation subset for a transmit symbol in the estimated transmit symbol vector. A soft decision metric may be calculated using the elements from the set of error distances. In some embodiments the transmit symbols of a transmit symbol vector and the soft decision metrics for each transmit symbol may be determined in parallel.
摘要翻译：在多输入多输出通信系统中，可以使用基于接收符号矢量的降低的复杂度最大似然（ML）检测方法来估计发送符号向量和一组软判决度量，置换通道矩阵。降低复杂度ML检测方法可以使用不同的置换信道矩阵来估计发射符号向量中的每个发射符号。可以针对估计的发射符号向量计算一组误差距离，每个误差距离被选择与估计的发射符号向量中的发射符号的信号星座子集不同的值。可以使用来自误差距离集合的元素来计算软判决度量。在一些实施例中，可以并行确定发射符号向量的发射符号和每个发射符号的软判决度量。

8. 发明申请

US20100111212A1 Decision Feedback Channel Estimation And Pilot Tracking for OFDM Systems 有权
标题翻译： OFDM系统的决策反馈信道估计和导频跟踪
公开(公告)号：US20100111212A1
公开(公告)日：2010-05-06
申请号：US12688733
申请日：2010-01-15
申请人： Qinfang Sun , Won-Joon Choi , Jeffrey M. Gilbert , Ning Zhang , Yi-Hsiu Wang , Tao-Fei Samuel Ng
发明人： Qinfang Sun , Won-Joon Choi , Jeffrey M. Gilbert , Ning Zhang , Yi-Hsiu Wang , Tao-Fei Samuel Ng
IPC分类号： H04L27/28 , H04L27/00
CPC分类号： H04L25/022 , H04L25/0236 , H04L27/2647 , H04L2025/03522
摘要： Current OFDM systems use a limited number of symbols and/or sub-channels to provide approximations for channel estimations and pilot tracking, i.e. phase estimations. For example, two training symbols in the preamble of a data packet are used to provide channel estimation. Four of the fifty-four sub-channels are reserved for providing phase estimation. However, noise and other imperfections can cause errors in both of these estimations, thereby degrading system performance. Advantageously, decision feedback mechanisms can be provided to significantly improve channel estimation and pilot tracking in OFDM systems. The decision feedback mechanisms can use data symbols in the data packet to improve channel estimation as well as data sub-channels to improve pilot tracking.
摘要翻译：当前OFDM系统使用有限数量的符号和/或子信道来提供用于信道估计和导频跟踪（即相位估计）的近似。例如，使用数据分组的前导码中的两个训练符号来提供信道估计。五十四个子通道中的四个保留用于提供相位估计。然而，噪声和其他缺陷可能会导致这两种估计中的错误，从而降低系统性能。有利地，可以提供决策反馈机制以显着地改善OFDM系统中的信道估计和导频跟踪。决策反馈机制可以使用数据分组中的数据符号来改进信道估计以及数据子信道，以改进导频跟踪。

9. 发明授权

US5081652A Offset correction 失效
标题翻译：偏移校正
公开(公告)号：US5081652A
公开(公告)日：1992-01-14
申请号：US505016
申请日：1990-04-04
申请人： Nader Farahati , Samuel Ng
发明人： Nader Farahati , Samuel Ng
IPC分类号： H04L27/227
CPC分类号： H04L27/2272
摘要： A radio receiver includes apparatus for correcting phase and frequency offsets in a digitally modulated carrier signal. The receiver includes processing circuitry which outputs a baseband signal at point. The circuitry includes a local oscillator generating a signal intended to have a phase and frequency related (e.g. substantially equal) to the carrier signal. The baseband signal from the circuitry is input to a demodulator which generates a signal in the form of a sequence of digits corresponding to the original carrier signal. The baseband signal is sampled by a sampler and the demodulated signal is sampled by a sampler. Processing circuitry calculates the correlation function of the two sample signals and determines the value of the phase .PHI..sub.x at a time when the correlation function is a maximum. A control signal V.sub.c indicative of the phase .PHI..sub.x is generated by a signal generator and applied to the oscillator whereby the phase of the oscillator output signal is adjusted by an amount corresponding to the phase offset. Preferably, sampling is effected on at least two occasions. The phase differences determined on each correlation are subtractively combined and the resultant phase value is divided by the time interval between the peaks of the two associated correlation functions to derive a value for the offset frequency. A control signal indicative of the frequency offset is then fed to the oscillator means to modify the oscillator output frequency accordingly.

10. 发明授权

US08245210B2 Compile-time context for dynamically bound operations 有权
标题翻译：用于动态绑定操作的编译时上下文
公开(公告)号：US08245210B2
公开(公告)日：2012-08-14
申请号：US12470746
申请日：2009-05-22
申请人： Samuel Ng , Mads Torgersen , Martin Maly , Christopher Joseph Burrows , James Hugunin
发明人： Samuel Ng , Mads Torgersen , Martin Maly , Christopher Joseph Burrows , James Hugunin
IPC分类号： G06F9/45
CPC分类号： G06F8/443
摘要： Compile-time context information is captured and provided to a runtime binder for dynamic features in programming languages. For example, a C# run-time binder uses the information to perform a run-time bind with semantics matching the compiler's binding behavior. Dynamic programming language features supported relate to compound operations, events, delegates, member accessibility, dynamic-typed objects, structs passed by ref, arguments passed by name rather than position, extension methods, conditionally compiled methods, literal arguments, overflow checking, dynamic indexed properties, dynamic method groups, and static method groups.
摘要翻译：编译时上下文信息被捕获并提供给编程语言中的动态特征的运行时绑定。例如，C＃运行时绑定器使用该信息来执行与编译器的绑定行为匹配的语义的运行时绑定。支持的动态编程语言功能涉及复合操作，事件，委托，成员可访问性，动态类型对象，由ref传递的结构，通过名称而不是位置传递的参数，扩展方法，有条件编译的方法，文字参数，溢出检查，动态索引属性，动态方法组和静态方法组。

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