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公开(公告)号：US09137054B2
公开(公告)日：2015-09-15
申请号：US13284898
申请日：2011-10-29
CPC分类号： H04L25/022 , H04L25/0204 , H04L25/0224 , H04L25/03821 , H04L27/2601
摘要： In an embodiment, a transmitter includes a transmission path that is configurable to generate first pilot clusters each including a respective first pilot subsymbol in a first cluster position and a respective second pilot subsymbol in a second cluster position such that a vector formed by the first pilot subsymbols is orthogonal to a vector formed by the second pilot subsymbols. For example, where such a transmitter transmits simultaneous orthogonal-frequency-division-multiplexed (OFDM) signals (e.g., MIMO-OFDM signals) over respective channels that may impart inter-carrier interference (ICI) to the signals due to Doppler spread, the pattern of the pilot symbols that compose the pilot clusters may allow a receiver of these signals to estimate the responses of these channels more accurately than conventional receivers.
摘要翻译： 在一个实施例中，发射机包括可配置为生成第一导频簇的传输路径，每个导频簇包括第一簇位置中的相应第一导频子符号和第二簇位置中的相应第二导频子符号，使得由第一导频形成的向量 子符号与由第二导航子符号形成的向量正交。 例如，在这种发射机通过可能由于多普勒扩频而给予信号的载波间干扰（ICI）的相应信道上发射同时正交频分复用（OFDM）信号（例如，MIMO-OFDM信号）的情况下， 构成导频簇的导频符号的模式可以允许这些信号的接收机比常规接收机更准确地估计这些信道的响应。
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2.发明授权Accounting for inter-carrier interference in determining a response of an OFDM communication channel 有权在确定OFDM通信信道的响应时考虑载波间干扰公开(公告)号：US09020050B2
公开(公告)日：2015-04-28
申请号：US12963569
申请日：2010-12-08
CPC分类号： H04L25/022 , H04L25/0204 , H04L25/0224 , H04L25/03821 , H04L27/2601
摘要： In an embodiment, a channel estimator includes first and second stages. The first stage is operable to generate a respective one-dimensional array of first channel-estimation coefficients for each communication path of a communication channel, and the second stage is operable to generate a multi-dimensional array of second channel-estimation coefficients in response to the first channel-estimation coefficients. For example, such a channel estimator may estimate the response of a channel over which propagates an orthogonal-frequency-division-multiplexed (OFDM) signal that suffers from inter-carrier interference (ICI) due to Doppler spread. Such a channel estimator may estimate the channel response more efficiently, and with a simpler algorithm, than conventional channel estimators. Furthermore, such a channel estimator may be able to dynamically account for changes in the number of communication paths that compose the channel, for changes in the delays of these paths, or the portions of the transmitted symbol energy carried by these paths.
摘要翻译： 在一个实施例中，信道估计器包括第一和第二阶段。 第一级可操作以产生用于通信信道的每个通信路径的第一信道估计系数的相应一维阵列，并且第二级可操作以响应于第二信道估计系数生成第二信道估计系数的多维阵列 第一个信道估计系数。 例如，这样的信道估计器可以估计传播由于多普勒扩展而遭受载波间干扰（ICI）的正交频分复用（OFDM）信号的信道的响应。 这样的信道估计器可以比传统的信道估计器更有效地估计信道响应，并且使用更简单的算法来估计信道响应。 此外，这样的信道估计器可能能够动态地考虑构成信道的通信路径的数量的变化，这些路径的延迟的改变或由这些路径携带的所发送的符号能量的部分的变化。
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3.发明授权Determining a response of a rapidly varying OFDM communication channel using an observation scalar 有权使用观测标量确定快速变化的OFDM通信信道的响应公开(公告)号：US09130788B2
公开(公告)日：2015-09-08
申请号：US13284894
申请日：2011-10-29
CPC分类号： H04L25/022 , H04L25/0204 , H04L25/0224 , H04L25/03821 , H04L27/2601
摘要： In an embodiment, a channel estimator includes first and second stages. The first stage is configurable to generate an observation scalar for a communication path of a communication channel, and the second stage is configurable to generate channel-estimation coefficients in response to the first observation scalar. For example, such a channel estimator may use a recursive algorithm, such as a VSSO Kalman algorithm, to estimate the response of a channel over which propagates an OFDM signal that suffers from ICI due to Doppler spread. Such a channel estimator may estimate the channel response more accurately, more efficiently, with a less-complex algorithm, and with less-complex software or circuitry, than conventional channel estimators. Furthermore, such a channel estimator may be able to dynamically account for changes in the number of communication paths that compose the channel, changes in the delays of these paths, and changes in the signal-energy levels of these paths.
摘要翻译： 在一个实施例中，信道估计器包括第一和第二阶段。 第一级可配置为生成通信信道的通信路径的观测标量，并且第二级可配置为响应于第一观测标量生成信道估计系数。 例如，这样的信道估计器可以使用诸如VSSO卡尔曼算法的递归算法来估计由于多普勒扩展而传播由于ICI而导致的OFDM信号的信道的响应。 这样的信道估计器可以比传统的信道估计器更准确，更有效地利用较不复杂的算法以及比较复杂的软件或电路来估计信道响应。 此外，这样的信道估计器可以能够动态地考虑构成信道的通信路径的数量的改变，这些路径的延迟的改变以及这些路径的信号能级的变化。
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公开(公告)号：US09240908B2
公开(公告)日：2016-01-19
申请号：US13284890
申请日：2011-10-29
CPC分类号： H04L25/022 , H04L25/0204 , H04L25/0224 , H04L25/03821 , H04L27/2601
摘要： In an embodiment, a transmitter includes first and second transmission paths. The first transmission path is configurable to generate first pilot clusters each including a respective first pilot subsymbol in a first cluster position, and the second transmission path is configurable to generate second pilot clusters each including a respective second pilot subsymbol in a second cluster position such that a vector formed by the first pilot subsymbols is orthogonal to a vector formed by the second pilot subsymbols. For example, where such a transmitter transmits simultaneous orthogonal-frequency-division-multiplexed (OFDM) signals (e.g., MIMO-OFDM signals) over respective channels that may impart inter-carrier interference (ICI) to the signals due to Doppler spread, the pattern of the pilot symbols that compose the pilot clusters may allow a receiver of these signals to use a recursive algorithm, such as a Vector State Scalar Observation (VSSO) Kalman algorithm, to estimate the responses of these channels.
摘要翻译： 在一个实施例中，发射机包括第一和第二传输路径。 第一传输路径可配置为产生第一导频簇，每个导频簇包括在第一簇位置中的相应的第一导频子符号，并且第二传输路径可配置为生成第二导频簇，每个导频簇包括第二簇位置中的相应的第二导频子符号，使得 由第一导频子符号形成的向量与由第二导频子符号形成的向量正交。 例如，在这种发射机通过可能由于多普勒扩展而给予信号的载波间干扰（ICI）的相应信道上发射同时正交频分复用（OFDM）信号（例如，MIMO-OFDM信号）的情况下， 构成导频簇的导频符号的模式可以允许这些信号的接收机使用诸如矢量状态标量观测（VSSO）卡尔曼算法的递归算法来估计这些信道的响应。
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5.发明授权Determining responses of rapidly varying MIMO-OFDM communication channels using observation scalars 有权使用观测标量确定快速变化的MIMO-OFDM通信信道的响应公开(公告)号：US09148311B2
公开(公告)日：2015-09-29
申请号：US13284879
申请日：2011-10-29
CPC分类号： H04L25/022 , H04L25/0204 , H04L25/0224 , H04L25/03821 , H04L27/2601
摘要： In an embodiment, a channel estimator includes first, second, and third stages. The first stage is configurable to generate a first observation scalar for a first communication path of a first communication channel, and the second stage is configurable to generate a second observation scalar for a first communication path of a second communication channel. And the third stage is configurable to generate channel-estimation coefficients in response to the first and second observation scalars. For example, such a channel estimator may use a recursive algorithm, such as a Vector State Scalar Observation (VSSO) Kalman algorithm, to estimate the responses of channels over which propagate simultaneous orthogonal-frequency-division-multiplexed (OFDM) signals (e.g., MIMO-OFDM signals) that suffer from inter-carrier interference (ICI) due to Doppler spread. Such a channel estimator may estimate the channel responses more accurately, more efficiently, with a less-complex algorithm, and with less-complex software or circuitry, than conventional channel estimators.
摘要翻译： 在一个实施例中，信道估计器包括第一，第二和第三阶段。 第一级可配置为生成第一通信信道的第一通信路径的第一观察标量，并且第二级可配置为生成第二通信信道的第一通信路径的第二观察标量。 并且第三阶段可配置为响应于第一和第二观测标量产生信道估计系数。 例如，这样的信道估计器可以使用诸如矢量状态标量观测（VSSO）卡尔曼算法的递归算法来估计传播的同时正交频分复用（OFDM）信号（例如， MIMO-OFDM信号），其由于多普勒扩展而受到载波间干扰（ICI）的影响。 这样的信道估计器可以比传统的信道估计器更精确地，更有效地利用较不复杂的算法和不太复杂的软件或电路来估计信道响应。
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公开(公告)号：US08737536B2
公开(公告)日：2014-05-27
申请号：US12579935
申请日：2009-10-15
IPC分类号： H04B3/46
CPC分类号： H04L25/022 , H04L25/0244 , H04L25/03821 , H04L27/2601
摘要： In an embodiment, a multi-carrier signal (e.g., an OFDM signal) is received over a channel. Indicators of interference and the channel response at a carrier frequency of the signal are determined, and compared. If the indicator of interference has a particular relationship to the indicator of the channel response, then a data value transmitted at the carrier frequency is recovered from a data value received at the carrier frequency according to a particular data-recovery algorithm. Because the particular data-recovery algorithm may be faster than a conventional data-recovery algorithm, recovering one or more data values with the particular algorithm may increase the speed at which data is recovered from a multicarrier signal as compared to using a conventional data-recovery algorithm.
摘要翻译： 在一个实施例中，通过信道接收多载波信号（例如，OFDM信号）。 确定信号载波频率处的干扰指标和信道响应，并进行比较。 如果干扰指示符与信道响应的指示符具有特定的关系，则根据特定的数据恢复算法从载波频率接收的数据值恢复在载波频率处发送的数据值。 由于特定的数据恢复算法可能比传统的数据恢复算法更快，与使用常规数据恢复相比，用特定算法恢复一个或多个数据值可能会增加数据从多载波信号中恢复的速度 算法。
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公开(公告)号：US20120114069A1
公开(公告)日：2012-05-10
申请号：US13284890
申请日：2011-10-29
IPC分类号： H04B1/02
CPC分类号： H04L25/022 , H04L25/0204 , H04L25/0224 , H04L25/03821 , H04L27/2601
摘要： In an embodiment, a transmitter includes first and second transmission paths. The first transmission path is configurable to generate first pilot clusters each including a respective first pilot subsymbol in a first cluster position, and the second transmission path is configurable to generate second pilot clusters each including a respective second pilot subsymbol in a second cluster position such that a vector formed by the first pilot subsymbols is orthogonal to a vector formed by the second pilot subsymbols. For example, where such a transmitter transmits simultaneous orthogonal-frequency-division-multiplexed (OFDM) signals (e.g., MIMO-OFDM signals) over respective channels that may impart inter-carrier interference (ICI) to the signals due to Doppler spread, the pattern of the pilot symbols that compose the pilot clusters may allow a receiver of these signals to use a recursive algorithm, such as a Vector State Scalar Observation (VSSO) Kalman algorithm, to estimate the responses of these channels.
摘要翻译： 在一个实施例中，发射机包括第一和第二传输路径。 第一传输路径可配置为产生第一导频簇，每个导频簇包括第一簇位置中的相应的第一导频子符号，并且第二传输路径可配置为生成第二导频簇，每个导频簇包括第二簇位置中的相应的第二导频子符号，使得 由第一导频子符号形成的向量与由第二导频子符号形成的向量正交。 例如，在这种发射机通过可能由于多普勒扩展而给予信号的载波间干扰（ICI）的相应信道上发射同时正交频分复用（OFDM）信号（例如，MIMO-OFDM信号）的情况下， 构成导频簇的导频符号的模式可以允许这些信号的接收机使用诸如矢量状态标量观测（VSSO）卡尔曼算法的递归算法来估计这些信道的响应。
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公开(公告)号：US08619808B2
公开(公告)日：2013-12-31
申请号：US13231668
申请日：2011-09-13
申请人： Liwen Chu , George A. Vlantis
发明人： Liwen Chu , George A. Vlantis
摘要： In a 60 Hz WGA wireless network, not all frames with the duration field are received by a STA in a WGA network because of directional antennas. Therefore, a NAV Timer cannot account for the reserved duration of the channel by only updating with the longest duration field received. A STA can receive two frames each with a source and destination addresses and update the NAV Timer by comparing the received addresses to overcome such problem. Further, a STA can receive one frame with a source and destination addresses and update the NAV Timer by comparing the received addresses with the NAVSRC and NAVDST values.
摘要翻译： 在60Hz WGA无线网络中，由于定向天线，WGA网络中STA不会收到持续时间字段的所有帧。 因此，NAV定时器不能仅通过接收到的最长持续时间字段来更新信道的保留持续时间。 STA可以接收两个帧，每个帧具有源和目的地址，并通过比较接收到的地址来更新NAV定时器，以克服这种问题。 此外，STA可以接收具有源和目的地地址的一帧，并通过将接收到的地址与NAVSRC和NAVDST值进行比较来更新NAV定时器。
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公开(公告)号：US20130176921A1
公开(公告)日：2013-07-11
申请号：US13344351
申请日：2012-01-05
申请人： Liwen Chu , George A. Vlantis
发明人： Liwen Chu , George A. Vlantis
IPC分类号： H04W52/02
CPC分类号： H04W52/0225 , H04W52/0206 , Y02D70/00
摘要： A wireless, specifically VHT, system that includes APs and STAs can power save during the TXOP. The AP in the system announces whether STAs in the system do SU or MU TXOP power save in a Beacon/Probe Response, and the STAs in the system transmit to the AP whether the STA is capable and willing to save power during a SU, MU, or SU+MU TXOP. For the AP, the process further involves buffering data frames for STAs that have entered doze mode until the end of TXOP. The AP further transmits to STAs a duration of TXOP in the Duration field of a RTS frame. The STA can inform the AP to enter TXOP PM mode in a bit in the HT Control field.
摘要翻译： 包括AP和STA的无线，特别是VHT系统可以在TXOP期间节电。 系统中的AP宣布系统中的STA是否在信标/探测响应中执行SU或MU TXOP功率保存，并且系统中的STA向AP发送STA是否能够并且愿意在SU，MU期间节省功率 ，或SU + MU TXOP。 对于AP，该过程还涉及缓冲已经进入打盹模式的STA的数据帧，直到TXOP结束。 AP在RTS帧的持续时间字段中进一步向STA发送TXOP的持续时间。 STA可以通知AP在HT控制字段中的一位中进入TXOP PM模式。
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10.发明申请Method and apparatus for reducing power comsumption in a wireless communication device 有权一种用于降低无线通信设备中功率消耗的方法和设备公开(公告)号：US20120135776A1
公开(公告)日：2012-05-31
申请号：US12927932
申请日：2010-11-30
申请人： Liwen Chu , George A. Vlantis
发明人： Liwen Chu , George A. Vlantis
IPC分类号： H04B7/00
CPC分类号： H04W52/0238 , Y02D70/00 , Y02D70/142
摘要： A method and apparatus for conserving power in a wireless communication device. The method includes receiving at least a portion of a PHY protocol data unit (PPDU) frame, where the PPDU frame includes an aggregate MAC protocol data unit (A-MPDU) field. The method also includes comparing a receiver address (RA) within the A-MPDU field to a stored address of the wireless communication device and, if the received RA does not match the stored address, causing power to be removed from one or more circuits of the wireless communication device for a calculated period of time.
摘要翻译： 一种用于在无线通信设备中节省功率的方法和装置。 该方法包括接收PHY协议数据单元（PPDU）帧的至少一部分，其中PPDU帧包括聚合MAC协议数据单元（A-MPDU）字段。 该方法还包括将A-MPDU字段内的接收器地址（RA）与无线通信设备的存储地址进行比较，并且如果接收到的RA与存储的地址不匹配，则导致从一个或多个电路 所述无线通信设备在计算的时间段内。
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