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1. 发明授权

US07408976B1 MIMO-OFDM receiver processing with frequency and channel estimation 有权
标题翻译：具有频率和信道估计的MIMO-OFDM接收机处理
公开(公告)号：US07408976B1
公开(公告)日：2008-08-05
申请号：US10912829
申请日：2004-08-05
申请人： Ravi Narasimhan , Hemanth Sampath , Hsiao-Cheng Tang
发明人： Ravi Narasimhan , Hemanth Sampath , Hsiao-Cheng Tang
IPC分类号： H04B1/69 , H04B1/04
CPC分类号： H04L27/2663 , H04B7/0413 , H04B17/21 , H04L1/0054 , H04L5/0007 , H04L5/0023 , H04L5/0026 , H04L25/0204 , H04L25/03159 , H04L27/2602 , H04L27/266
摘要： A receiver in a MIMO-OFDM system may process OFDM symbols received on a number (MR) of receive antennas. The system may utilize a MIMO-OFDM frame format that includes additional long training OFDM symbols, for training additional antennas and for link adaptation, and a header with an additional SIGNAL symbol to indicate MIMO-OFDM-specific information.
摘要翻译： MIMO-OFDM系统中的接收机可以处理在数个（M SUB R）个接收天线上接收的OFDM符号。该系统可以利用包括附加的长训练OFDM符号的MIMO-OFDM帧格式，用于训练附加天线和链路适配，以及具有附加信号符号的报头以指示MIMO-OFDM特定信息。

2. 发明授权

US08737939B1 Method and apparatus for detecting presence of an unmodulated RF carrier prior to a communication frame 有权
标题翻译：用于在通信帧之前检测未调制RF载波的存在的方法和装置
公开(公告)号：US08737939B1
公开(公告)日：2014-05-27
申请号：US13250701
申请日：2011-09-30
申请人： Kevin Hsiao-Cheng Tang , Atul Salhotra
发明人： Kevin Hsiao-Cheng Tang , Atul Salhotra
IPC分类号： H04B1/04
CPC分类号： H04B1/0466
摘要： A measurement signal, the measurement signal indicative of a bias in a signal received via a communication channel, is generated. A detection signal, the detection signal indicative of presence of an unmodulated radio frequency (RF) carrier prior to a communication frame in the signal received via the communication channel, is generated using the measurement signal.
摘要翻译：产生测量信号，表示通过通信信道接收的信号中的偏置的测量信号。在通过通信信道接收的信号中的通信帧之前，产生检测信号，该信号表示存在未调制射频（RF）载波的检测信号。

3. 发明授权

US08306094B1 MIMO-OFDM receiver processing 有权
标题翻译： MIMO-OFDM接收机处理
公开(公告)号：US08306094B1
公开(公告)日：2012-11-06
申请号：US12876034
申请日：2010-09-03
申请人： Ravi Narasimhan , Hemanth Sampath , Hsiao-Cheng Tang
发明人： Ravi Narasimhan , Hemanth Sampath , Hsiao-Cheng Tang
IPC分类号： H04B1/00
CPC分类号： H04L27/2663 , H04B7/0413 , H04B17/21 , H04L1/0054 , H04L5/0007 , H04L5/0023 , H04L5/0026 , H04L25/0204 , H04L25/03159 , H04L27/2602 , H04L27/266
摘要： A device can include a module configured to: receive one or more frames, at least one frame including a training sequence; determine a fine frequency offset using the training sequence; and perform frequency offset compensation on the at least one frame using the fine frequency offset.
摘要翻译：设备可以包括被配置为：接收一个或多个帧的模块，包括训练序列的至少一个帧; 使用训练序列确定精细的频率偏移; 并使用精细频率偏移对至少一个帧执行频偏补偿。

4. 发明授权

US08027366B1 Technique for reducing physical layer (PHY) overhead in wireless LAN systems 有权
标题翻译：用于减少无线局域网系统中物理层（PHY）开销的技术
公开(公告)号：US08027366B1
公开(公告)日：2011-09-27
申请号：US12703288
申请日：2010-02-10
申请人： Hsiao-Cheng Tang , Ravi Narasimhan , Hemanth Sampath
发明人： Hsiao-Cheng Tang , Ravi Narasimhan , Hemanth Sampath
IPC分类号： H04L12/56 , H04J1/16
CPC分类号： H04L1/0079 , H04L1/0083 , H04L1/1607
摘要： A physical layer (PHY) packet aggregation technique may be used to reduce the percentage of PHY overhead in data transmission in order to achieve better PHY efficiency and higher throughput. Higher layer packets in an upper layer data queue may be fragmented into appropriate small-size sub-packets, which include a body encapsulated by a MAC header and an FCS field. The sub-packets are then concatenated to form the data field of an aggregated PHY packet. Since each of the sub-packets contains its own MAC (Media Access Control) header and FCS (Frame Check Sequence) field, the receiver can identify and flag erroneous sub-packets on an individual basis. The receiver may transmit a block ACK, which includes the acknowledgement status for each of the sub-packets in the aggregated PHY packet, to the transmitter. The transmitter may resend only the erroneous sub-packet(s).
摘要翻译：可以使用物理层（PHY）分组聚合技术来减少数据传输中PHY开销的百分比，以便实现更好的PHY效率和更高的吞吐量。上层数据队列中的较高层分组可能被分段成适当的小尺寸子分组，其包括由MAC头部和FCS字段封装的主体。然后，子分组被级联以形成聚合的PHY分组的数据字段。由于每个子分组包含其自身的MAC（媒体访问控制）报头和FCS（帧校验序列）字段，所以接收机可以单独地识别和标记错误的子分组。接收机可以向发射机发送包括聚合PHY分组中的每个子分组的确认状态的块ACK。发射机可以仅重新发送错误的子分组。

5. 发明授权

US07239199B1 Amplifier calibration 有权
标题翻译：放大器校准
公开(公告)号：US07239199B1
公开(公告)日：2007-07-03
申请号：US10825781
申请日：2004-04-16
申请人： George Chien , Donghong Cui , King Chun Tsai , Yungping Hsu , Hsiao-Cheng Tang , Yonghua Song
发明人： George Chien , Donghong Cui , King Chun Tsai , Yungping Hsu , Hsiao-Cheng Tang , Yonghua Song
IPC分类号： H03F1/02
CPC分类号： H03F3/45085 , H03F3/45596 , H03F2203/45048 , H03F2203/45072 , H03F2203/45212 , H03F2203/45354 , H03F2203/45356 , H03F2203/45372 , H03F2203/45682
摘要： Apparatus, systems, and methods implementing techniques for reducing the variation of a DC offset are described. An input signal is amplified to produce an intermediate signal. The intermediate signal is processed to produce a feedback signal and an output signal, where the output signal has a DC offset that varies with a varying parameter of the circuitry used to process the intermediate signal. Variation of the DC offset of the output signal is reduced using the feedback signal. In one implementation, the circuitry used to process the intermediate signal is a variable-gain amplifier circuit, and the DC offset of the output signal varies with a gain of the variable-gain amplifier.
摘要翻译：描述了实现用于减小DC偏移的变化的技术的装置，系统和方法。输入信号被放大以产生中间信号。处理中间信号以产生反馈信号和输出信号，其中输出信号具有随着用于处理中间信号的电路的变化参数而变化的DC偏移。使用反馈信号减小输出信号的直流偏移的变化。在一个实现中，用于处理中间信号的电路是可变增益放大器电路，并且输出信号的DC偏移随可变增益放大器的增益而变化。

6. 发明授权

US08565255B1 Clear channel assessment in wireless communications 有权
标题翻译：在无线通信中清除频道评估
公开(公告)号：US08565255B1
公开(公告)日：2013-10-22
申请号：US13013142
申请日：2011-01-25
申请人： Kevin Hsiao-Cheng Tang , Yungping Hsu , Guorong Hu , Weishi Feng
发明人： Kevin Hsiao-Cheng Tang , Yungping Hsu , Guorong Hu , Weishi Feng
IPC分类号： H04W84/12 , H04W28/04 , H04L12/44
CPC分类号： H04B17/00 , H04B1/707 , H04W24/00 , H04W74/08
摘要： A transceiver including: an antenna configured to a receive a first signal transmitted on a radio frequency channel; and a peak-to-sidelobe ratio determination unit configured to generate a second signal based on a ratio, in which the ratio is based on a peak value and a sidelobe value, and the peak value and the sidelobe value are determined based on a non-correlated version of the first signal. The transceiver further includes a carrier sense unit configured to, based on the second signal, generate a third signal indicating (i) whether the radio frequency channel is busy or (ii) whether the first signal is valid.
摘要翻译：收发器，包括：天线，被配置为接收在射频信道上发送的第一信号; 以及峰值与旁瓣比确定单元，其被配置为基于所述比率基于峰值和旁瓣值生成第二信号，并且所述峰值和旁瓣值是基于非 - 相关版本的第一个信号。所述收发机还包括载波侦听单元，被配置为基于所述第二信号，生成指示（i）所述无线电频道是否正忙的第三信号，或者（ii）所述第一信号是否有效。

7. 发明授权

US07403539B1 Clear channel assessment in wireless communications 有权
标题翻译：在无线通信中清除频道评估
公开(公告)号：US07403539B1
公开(公告)日：2008-07-22
申请号：US10268156
申请日：2002-10-09
申请人： Hsiao-Cheng Tang , Yungping Hsu , Guorong Hu , Weishi Feng
发明人： Hsiao-Cheng Tang , Yungping Hsu , Guorong Hu , Weishi Feng
IPC分类号： H04L12/413 , H04L12/28
CPC分类号： H04B17/00 , H04B1/707 , H04W24/00 , H04W74/08
摘要： Techniques for and apparatus capable of implementing packet detection and signal recognition in wireless communications systems are disclosed. In particular, the disclosed techniques and apparatus incorporate at least one of relative energy detection operable on assessment of a relative energy threshold for an inbound signal borne across an RF channel, carrier sense operable upon on assessment of at least one of a peak-to-sidelobe ratio and peak-to-peak distance defined by the inbound signal, and comparison operable upon demodulated data corresponding to the inbound signal as compared to predetermined preamble data. Clear channel assessment is performed based on determinations undertaken by one or more of the aforementioned relative energy detection, carrier sense and comparison operations.
摘要翻译：公开了能够在无线通信系统中实现分组检测和信号识别的技术和装置。具体地，所公开的技术和装置包括相对能量检测中的至少一个，其可操作用于对横跨RF信道承载的入站信号的相对能量阈值的评估，所述载波检测可在通过评估峰 - 旁瓣比和由峰值到峰值的距离，并且与对应于入站信号的解调数据进行比较，与预定的前导码数据相比较。基于由上述相对能量检测，载波检测和比较操作中的一个或多个进行的确定来执行清除信道评估。

8. 发明授权

US07876770B1 Clear channel assessment in wireless communications 有权
标题翻译：在无线通信中清除频道评估
公开(公告)号：US07876770B1
公开(公告)日：2011-01-25
申请号：US12156080
申请日：2008-05-29
申请人： Hsiao-Cheng Tang , Yungping Hsu , Guorong Hu , Weishi Feng
发明人： Hsiao-Cheng Tang , Yungping Hsu , Guorong Hu , Weishi Feng
IPC分类号： H04L12/413
CPC分类号： H04B17/00 , H04B1/707 , H04W24/00 , H04W74/08
摘要： Techniques for and apparatus capable of implementing packet detection and signal recognition in wireless communications systems are disclosed. In particular, the disclosed techniques and apparatus incorporate at least one of relative energy detection operable on assessment of a relative energy threshold for an inbound signal borne across an RF channel, carrier sense operable upon on assessment of at least one of a peak-to-sidelobe ratio and peak-to-peak distance defined by the inbound signal, and comparison operable upon demodulated data corresponding to the inbound signal as compared to predetermined preamble data. Clear channel assessment is performed based on determinations undertaken by one or more of the aforementioned relative energy detection, carrier sense and comparison operations.
摘要翻译：公开了能够在无线通信系统中实现分组检测和信号识别的技术和装置。具体地，所公开的技术和装置包括相对能量检测中的至少一个，其可操作用于对横跨RF信道承载的入站信号的相对能量阈值的评估，所述载波检测可在通过评估峰 - 旁瓣比和由峰值到峰值的距离，并且与对应于入站信号的解调数据进行比较，与预定的前导码数据相比较。基于由上述相对能量检测，载波检测和比较操作中的一个或多个进行的确定来执行清除信道评估。

9. 发明授权

US08032095B1 Method and apparatus for detecting carrier leakage in a wireless or similar system 有权
标题翻译：用于检测无线或类似系统中的载波泄漏的方法和装置
公开(公告)号：US08032095B1
公开(公告)日：2011-10-04
申请号：US11213907
申请日：2005-08-30
申请人： Kevin Hsiao-Cheng Tang , Atul Salhotra
发明人： Kevin Hsiao-Cheng Tang , Atul Salhotra
IPC分类号： H04B1/04
CPC分类号： H04B1/0466
摘要： A method and circuit for indicating signal faults in wireless transmissions, particularly, a carrier leak, includes an input to receive a wireless signal, a bias detector that detects a bias in a portion of the signal and outputs a bias value indicative of the bias, an evaluator configured to compare the bias value to at least one allowable transmission signal value, and output a signal when the bias value is outside the allowable transmission signal value, and an output, responsive to the evaluator, to indicate a carrier leakage in the wireless signal. A buffer may be provided between the input and the evaluator. The sensitivity of the circuit may be adjusted and a protocol determination may be made.
摘要翻译：用于指示无线传输中的信号故障，特别是载波泄漏的方法和电路包括接收无线信号的输入端，偏置检测器，其检测信号的一部分中的偏置并输出指示偏置的偏置值，评估器，被配置为将所述偏置值与至少一个可允许的传输信号值进行比较，并且当所述偏置值在所述允许的传输信号值之外时输出信号;以及响应于所述评估器的输出，以指示所述无线电中的载波泄漏信号。可以在输入和评估器之间提供缓冲器。可以调整电路的灵敏度，并且可以进行协议确定。

10. 发明授权

US07796681B1 MIMO-OFDM receiver processing 有权
标题翻译： MIMO-OFDM接收机处理
公开(公告)号：US07796681B1
公开(公告)日：2010-09-14
申请号：US12179830
申请日：2008-07-25
申请人： Ravi Narasimhan , Hemanth Sampath , Hsiao-Cheng Tang
发明人： Ravi Narasimhan , Hemanth Sampath , Hsiao-Cheng Tang
IPC分类号： H04B1/69
CPC分类号： H04L27/2663 , H04B7/0413 , H04B17/21 , H04L1/0054 , H04L5/0007 , H04L5/0023 , H04L5/0026 , H04L25/0204 , H04L25/03159 , H04L27/2602 , H04L27/266
摘要： A receiver in a MIMO-OFDM system may process OFDM symbols received on a number (MR) of receive antennas. The system may utilize a MIMO-OFDM frame format that includes additional long training OFDM symbols, for training additional antennas and for link adaptation, and a header with an additional SIGNAL symbol to indicate MIMO-OFDM-specific information.
摘要翻译： MIMO-OFDM系统中的接收机可以处理在数个（MR）接收天线上接收的OFDM符号。该系统可以利用包括附加的长训练OFDM符号的MIMO-OFDM帧格式，用于训练附加天线和链路适配，以及具有附加信号符号的报头以指示MIMO-OFDM特定信息。

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