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公开(公告)号：US09385911B2
公开(公告)日：2016-07-05
申请号：US13466929
申请日：2012-05-08
申请人： Sameer Vermani , Santosh P. Abraham , Mohammad Hossein Taghavi Nasrabadi , Vincent K. Jones , Hemanth Sampath
发明人： Sameer Vermani , Santosh P. Abraham , Mohammad Hossein Taghavi Nasrabadi , Vincent K. Jones , Hemanth Sampath
CPC分类号： H04L69/18 , H04L1/0029 , H04L1/0039 , H04L29/06163
摘要： Systems and methods for communicating packets having a plurality of formats are described herein. In some aspects, a signal (SIG) field in the preamble of a packet may indicate whether an extension field, such as an extension SIG field or SIG-B field, is included in the packet. In another aspect, one or more detectors may be used to auto-detect packets formatted as one of at least two different formats based on a short training field (STF) of a received packet. In some aspects, along training field (LTF) in the preamble of a packet may indicate whether the payload is repetition coded.
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公开(公告)号：US09154363B2
公开(公告)日：2015-10-06
申请号：US13466971
申请日：2012-05-08
申请人： Sameer Vermani , Santosh P. Abraham , Mohammad Hossein Taghavi Nasrabadi , Vincent K. Jones , Hemanth Sampath
发明人： Sameer Vermani , Santosh P. Abraham , Mohammad Hossein Taghavi Nasrabadi , Vincent K. Jones , Hemanth Sampath
CPC分类号： H04L29/06163 , H04L1/0028 , H04L1/0033 , H04L1/0039 , H04L29/0653 , H04L69/18 , H04L69/22 , H04W80/04
摘要： Systems and methods for communicating packets having a plurality of formats are described herein. In some aspects, a signal (SIG) field in the preamble of a packet may indicate whether an extension field, such as an extension SIG field or SIG-B field, is included in the packet. In another aspect, one or more detectors may be used to auto-detect packets formatted as one of at least two different formats based on a short training field (STF) of a received packet. In some aspects, along training field (LTF) in the preamble of a packet may indicate whether the payload is repetition coded.
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3.发明授权Modified preamble structure for IEEE 802.11A extensions to allow for coexistence and interoperability between 802.11A devices and higher data rate, MIMO or otherwise extended devices 有权用于IEEE 802.11A扩展的修改的前导码结构，以允许802.11A设备和较高数据速率，MIMO或其他扩展设备之间的共存和互操作性公开(公告)号：US08743837B2
公开(公告)日：2014-06-03
申请号：US12552705
申请日：2009-09-02
IPC分类号： H04Q7/00
CPC分类号： H04L27/2613 , H04B7/04 , H04L5/0023 , H04L5/1438 , H04L25/0226 , H04L25/03248 , H04W24/00 , H04W84/12 , H04W88/06 , H04W99/00
摘要： A modified preamble is used by extended devices that operate at higher rates, MIMO or other extensions relative to strict 802.11a-compliant devices. The extended devices might use multiple antenna techniques (MIMO), where multiple data streams are multiplexed spatially and/or multi-channel techniques, where an extended transmitter transmits using more than one 802.11a channel at a time. Such extensions to IEEE 802.11a can exist in extended devices. The modified preamble is usable for signaling, to legacy devices as well as extended devices, to indicate capabilities and to cause legacy devices or extended devices to defer to other devices such that the common communication channel is not subject to unnecessary interference. The modified preamble is also usable for obtaining MIMO channel estimates and/or multi-channel estimates. The modified preamble preferably includes properties that facilitate detection of conventional and/or extended modes (“mode detection”) and provides some level of coexistence with legacy IEEE 802.11a devices.
摘要翻译： 经修改的前同步码由相对于严格的符合802.11a标准的设备的较高速率，MIMO或其他扩展操作的扩展设备使用。 扩展设备可能使用多个天线技术（MIMO），其中多个数据流在空间和/或多信道技术上复用，其中扩展发射机一次使用多于一个802.11a信道进行发射。 IEEE 802.11a的这种扩展可以存在于扩展设备中。 经修改的前导码可用于对传统设备以及扩展设备进行信令，以指示能力并使遗留设备或扩展设备推迟到其他设备，使得公共通信信道不受不必要的干扰。 经修改的前导码也可用于获得MIMO信道估计和/或多信道估计。 修改的前导码优选地包括便于检测常规和/或扩展模式（“模式检测”）并且提供与传统IEEE 802.11a设备的一些级别共存的属性。
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公开(公告)号：US08630680B2
公开(公告)日：2014-01-14
申请号：US12622097
申请日：2009-11-19
IPC分类号： H04M1/00
摘要： Circuits, methods, and apparatus that provide high-throughput control fields that, among other functions, provide efficient TXOP handoffs in wireless networks. A handoff may be made by setting one or more bits in a field in a QoS frame, such as the HT control or other appropriate field. Various conditions may be placed on a handoff by a granting station. For example, conditions specifying where a station receiving a TXOP handoff may send data, what the receiving station may do with any remaining TXOP, or what types of data may be transmitted by the receiving station may be imposed. These various conditions may be combined or omitted in any logic combination.
摘要翻译： 提供高吞吐量控制领域的电路，方法和装置，除了其他功能之外，在无线网络中提供有效的TXOP切换。 可以通过在QoS帧中的一个字段中设置一个或多个比特，诸如HT控制或其他适当的字段来进行越区切换。 各种条件可以由授权站进行切换。 例如，可以施加指定接收到TXOP切换的站点的哪里可以发送数据，接收站可以使用任何剩余的TXOP做什么，或者可以由接收站发送哪些类型的数据。 这些各种条件可以以任何逻辑组合组合或省略。
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公开(公告)号：US20120263107A1
公开(公告)日：2012-10-18
申请号：US13447149
申请日：2012-04-13
IPC分类号： H04W4/00
CPC分类号： H04W72/02 , H04L1/0003 , H04L1/001 , H04L1/0013 , H04L1/08 , H04L5/0044 , H04L27/2613
摘要： Systems, methods, and devices to enable range extension for wireless communication in sub-gigahertz bands are described herein. In some aspects, portions of packets are repeated in time and/or space when transmitting the packet in order to increase the chance that the packet can be decoded. The repetition of portions of the packet may be based, in part, on the channel characteristics of the channel over which the packet is sent. In some aspects, portions of packets are transmitted over a smaller bandwidth with increased power per frequency range.
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公开(公告)号：US08050344B2
公开(公告)日：2011-11-01
申请号：US12502300
申请日：2009-07-14
IPC分类号： H04L27/28
CPC分类号： H04B7/0619 , H04B7/0434 , Y02D70/142 , Y02D70/444
摘要： Improved beamforming techniques are provided for use in MIMO (multiple-input, multiple-output) communication systems, including MIMO-OFDM systems. The techniques include: (1) determining beamforming (BF) weights using a smoothed singular value decomposition (SVD) of the channel matrix; (2) determining BF weights using a power-optimized minimum mean-square error (MMSE) technique when the number of available transmit antennas exceeds the number of signal streams; and (3) determining BF weights using a hybrid SVD-MMSE technique. Additional techniques for reducing the impulse response length of the BF weights and/or normalizing the power per transmit antenna or per data stream may be used in conjunction with these or other beamforming techniques.
摘要翻译： 提供了改进的波束形成技术，用于包括MIMO-OFDM系统在内的MIMO（多输入多输出）通信系统。 这些技术包括：（1）使用信道矩阵的平滑奇异值分解（SVD）来确定波束形成（BF）权重; （2）当可用发射天线的数量超过信号流数时，使用功率优化最小均方误差（MMSE）技术确定BF权重; 和（3）使用混合SVD-MMSE技术确定BF权重。 可以结合这些或其他波束成形技术来使用用于减少BF加权的脉冲响应长度和/或使每个发射天线或每个数据流归一化功率的附加技术。
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公开(公告)号：US20110082905A1
公开(公告)日：2011-04-07
申请号：US12894418
申请日：2010-09-30
IPC分类号： G06F15/16
摘要： A method of operating a first wireless device includes sending a first message including a first intent to be a group owner and a value to a second wireless device. In addition, the method includes receiving a second message including a second intent to be the group owner from the second wireless device. Furthermore, the method includes determining which of the first wireless device or the second wireless device should be the group owner based on the first intent, the second intent, and the value.
摘要翻译： 操作第一无线设备的方法包括向第二无线设备发送包括作为组所有者的第一意图的第一消息和值。 此外，该方法包括从第二无线设备接收包括作为组所有者的第二意图的第二消息。 此外，该方法包括基于第一意图，第二意图和值来确定第一无线设备或第二无线设备中的哪一个应该是组所有者。
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公开(公告)号：US07869397B2
公开(公告)日：2011-01-11
申请号：US12467163
申请日：2009-05-15
IPC分类号： H04W4/00
CPC分类号： H04L5/023 , H04L27/2602
摘要： A medium access contention protocol that is highly beneficial in wireless networks and particularly in wireless networks that employ a fixed minimum burst size such as OFDM wireless networks. In one embodiment, a MAC protocol is a demand-assigned protocol that maximizes utilization of the bus medium (the allocated frequency spectrum.) Each data communication device (DCD) in the network communicates with a central access point (AP). Multiple DCDs may request access from the AP in the same request access (RA) burst. Each of the multiple DCDs transmits its access request to the AP within a frequency domain channel in the RA burst that is orthogonal to the frequency domain channels used by the other DCDs requesting access. Each DCD includes channel training information in the access request burst to allow the AP and/or DCD to adapt to rapid variations in channel characteristics.
摘要翻译： 一种媒体接入争用协议，其在无线网络中，特别是在使用诸如OFDM无线网络的固定的最小突发大小的无线网络中是非常有益的。 在一个实施例中，MAC协议是使总线介质（所分配的频谱）的利用最大化的需求分配协议。网络中的每个数据通信设备（DCD）与中央接入点（AP）通信。 多个DCD可以在相同的请求访问（RA）突发中请求来自AP的访问。 多个DCD中的每一个在RA突发中的频域信道内向AP发送其接入请求，该RA突发与正在其他DCD请求接入的频域信道正交。 每个DCD包括访问请求突发中的信道训练信息，以允许AP和/或DCD适应信道特性的快速变化。
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公开(公告)号：US07827457B1
公开(公告)日：2010-11-02
申请号：US11080792
申请日：2005-03-14
IPC分类号： G06F11/00
CPC分类号： H04L1/0068 , H04L1/0054 , H04L1/0065 , H04L2001/0093
摘要： Systems and methods for sharing a single decoder among data streams originating with multiple sources. Error correction coding techniques are modified to facilitate decoding of data from multiple sources multiplexed in the time domain at the decoder input. A single decoder accommodates multiple sources that have been encoded using disparate code rates. One application is an OFDM (orthogonal frequency division multiplexing) point to multipoint system.
摘要翻译： 用于在由多个源发起的数据流中共享单个解码器的系统和方法。 纠错编码技术被修改以便于在解码器输入处在时域中多路复用的多个源的数据解码。 单个解码器容纳已经使用不同代码率编码的多个源。 一种应用是OFDM（正交频分复用）点对多点系统。
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公开(公告)号：US07787900B1
公开(公告)日：2010-08-31
申请号：US12455448
申请日：2009-06-01
CPC分类号： H04B17/318 , H04B17/21 , H04W52/245
摘要： Systems and methods for advanced signaling between stages of transmitters and/or receivers in a digital communication system. One or more intermediate frequency signals and one or more control signals may share the same cable. Also, systems and methods are provided for calibrating head end receiver gain to improve subscriber unit power control loop performance.
摘要翻译： 数字通信系统中发射机和/或接收机的各级之间的高级信令的系统和方法。 一个或多个中频信号和一个或多个控制信号可以共享相同的电缆。 而且，提供用于校准头端接收器增益以提高用户单元功率控制环路性能的系统和方法。
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