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61. 发明授权

US08693331B1 Rate adaptation in wireless systems 失效
标题翻译：无线系统中的速率适配
公开(公告)号：US08693331B1
公开(公告)日：2014-04-08
申请号：US12983825
申请日：2011-01-03
申请人： Hemanth Sampath , Ravi Narasimhan
发明人： Hemanth Sampath , Ravi Narasimhan
IPC分类号： G08C15/00
CPC分类号： H04W28/22 , H04W84/18
摘要： Systems and techniques for rate adaptation in wireless communication systems are described. A described technique includes generating a transmission packet parameter associated with packets transmitted by a device at a first data rate; generating a reception packet parameter associated with packets received by the device; determining a second data rate based on the transmission packet parameter and the reception packet parameter; and transmitting future packets at the second data rate.
摘要翻译：描述了用于无线通信系统中速率适配的系统和技术。所描述的技术包括：以第一数据速率生成与由设备发送的分组相关联的传输分组参数; 产生与由所述设备接收的分组相关联的接收分组参数; 基于所述传输分组参数和所述接收分组参数来确定第二数据速率; 并以第二数据速率发送未来数据包。

62. 发明授权

US08625690B2 Systems and methods for wireless communication in sub gigahertz bands 有权
标题翻译：用于无线通信的子系统和方法
公开(公告)号：US08625690B2
公开(公告)日：2014-01-07
申请号：US13410633
申请日：2012-03-02
申请人： Mohammad Hossein Taghavi Nasrabadi , Sameer Vermani , Lin Yang , Hemanth Sampath
发明人： Mohammad Hossein Taghavi Nasrabadi , Sameer Vermani , Lin Yang , Hemanth Sampath
IPC分类号： H04K1/10
CPC分类号： H04L27/2647 , H04L5/0023 , H04L5/0053 , H04L27/2613 , H04L27/2628
摘要： Systems, methods, and devices for wireless communication. In one aspect, an apparatus for wireless communication is provided. The apparatus includes a receiver configured to receive a wireless signal comprising a packet. At least a portion of the wireless signal is configured to be received over a bandwidth lower than or equal to 1.25 MHz. The packet is formed from at least one orthogonal frequency-division multiplexing (OFDM) symbol comprising thirty-two tones. The thirty-two tones correspond to frequency subcarriers within the bandwidth. The thirty-two tones of the at least one OFDM symbol are allocated as: twenty-four data tones, two pilot tones, five guard tones, and one direct current (DC) tone. The apparatus includes a processor configured to evaluate the wireless signal. The processor includes a transform module configured to convert the at least one OFDM symbol into a frequency domain signal using a thirty-two point mode.
摘要翻译：用于无线通信的系统，方法和设备。一方面，提供一种无线通信装置。该装置包括被配置为接收包括分组的无线信号的接收机。无线信号的至少一部分被配置为在低于或等于1.25MHz的带宽上接收。分组由包括三十二个音调的至少一个正交频分复用（OFDM）符号形成。 32个音调对应于带宽内的频率子载波。至少一个OFDM符号的三十二个音调被分配为：二十四个数据音调，两个导频音调，五个保护音调和一个直流（DC）音调。该装置包括被配置为评估无线信号的处理器。处理器包括变换模块，其被配置为使用三十二点模式将至少一个OFDM符号转换成频域信号。

63. 发明授权

US08599945B2 Robust rank prediction for a MIMO system 有权
标题翻译： MIMO系统的鲁棒等级预测
公开(公告)号：US08599945B2
公开(公告)日：2013-12-03
申请号：US11449893
申请日：2006-06-09
申请人： Hemanth Sampath
发明人： Hemanth Sampath
IPC分类号： H04B7/02 , H04L1/02
CPC分类号： H04L1/0026 , H04B7/0417 , H04B7/063 , H04B7/0632 , H04B7/0697 , H04L1/0003 , H04L1/0007 , H04L1/0009 , H04L1/0025 , H04W52/04 , H04W52/26
摘要： Techniques for performing rank prediction in a MIMO system are described. Performance metrics for a plurality of ranks are initially determined. Each rank is indicative of a different number of data streams to send simultaneously via a MIMO channel. The performance metrics may relate to the capacity or signal quality of the MIMO channel or the throughput of data transmission sent via the MIMO channel. Adjustments are applied to the performance metrics for the ranks to obtain adjusted performance metrics. The adjustments account for system losses such as losses due to an error correction code used for data transmission, channel estimation errors at a receiver, variation in interference observed by the receiver, variability in transmit power due to power control, and/or other factors. A rank is selected for use based on the adjusted performance metrics for the ranks.
摘要翻译：描述了用于在MIMO系统中执行秩预测的技术。初始确定多个等级的性能指标。每个等级表示通过MIMO信道同时发送的不同数量的数据流。性能度量可以涉及MIMO信道的容量或信号质量或经由MIMO信道发送的数据传输的吞吐量。对行列的绩效指标进行调整，以获得调整后的绩效指标。该调整涉及系统损耗，例如由于用于数据传输的纠错码，接收机处的信道估计误差，接收机观测到的干扰变化，由于功率控制引起的发射功率变化以及/或其它因素造成的损耗。根据排名的调整后的绩效指标，选择使用等级。

64. 发明授权

US08594216B2 Beamforming feedback options for MU-MIMO 失效
标题翻译：波束形成MU-MIMO的反馈选项
公开(公告)号：US08594216B2
公开(公告)日：2013-11-26
申请号：US13216956
申请日：2011-08-24
申请人： Albert Van Zelst , Sameer Vermani , Didier Johannes Richard Van Nee , Hemanth Sampath , Vincent Knowles Jones, IV
发明人： Albert Van Zelst , Sameer Vermani , Didier Johannes Richard Van Nee , Hemanth Sampath , Vincent Knowles Jones, IV
IPC分类号： H04K1/10 , H04L27/28
CPC分类号： H04W72/0413 , H04B7/0413 , H04B7/0417 , H04B7/0617 , H04B7/0626 , H04B7/0634 , H04B7/0663
摘要： Beamforming may be used in MIMO communication systems to further enhance spectral efficiency. Beamforming refers to beamed transmissions to a single destination (e.g., a station) at a time, to enhance the rate and/or range of transmission. To perform beamforming from a source to one or more destinations, a channel and/or beamforming matrices corresponding to the channel needs to be known at the source, which may be obtained as feedback from the destination. However, the beamforming matrices may not be smooth over frequency as it is fed back from the destination. Therefore, certain aspects of the present disclosure provide beamforming feedback options, resulting in the smoothness of a beamforming matrix.
摘要翻译：波束形成可以用于MIMO通信系统中以进一步提高频谱效率。波束成形是指一次向单个目的地（例如，站）的波束传输，以增强传输的速率和/或范围。为了从源到一个或多个目的地执行波束成形，需要在源处知道对应于该信道的信道和/或波束成形矩阵，其可以作为来自目的地的反馈获得。然而，当从目的地反馈时，波束形成矩阵可能不是频率上的平滑。因此，本公开的某些方面提供波束成形反馈选项，导致波束形成矩阵的平滑度。

65. 发明授权

US08532081B1 Data rate adaptation in multiple-in-multiple-out systems 有权
标题翻译：多重多输出系统中的数据速率调整
公开(公告)号：US08532081B1
公开(公告)日：2013-09-10
申请号：US13425350
申请日：2012-03-20
申请人： Ravi Narasimhan , Hemanth Sampath
发明人： Ravi Narasimhan , Hemanth Sampath
IPC分类号： H04J1/00
CPC分类号： H04L1/0001 , H04B7/0689
摘要： A transmit data rate adaptation method in a multiple-in-multiple-out (MIMO) system with a first transceiver and a second transceiver. The first transceiver transmits signals to the second transceiver. The second transceiver analyzes channel quality of the received signals and uses link adaptation to generate a shortlist of transmit modes to send back to the first transceiver. The first transceiver cycles through the shortlist of transmit modes to find an optimum transmit mode.
摘要翻译：一种具有第一收发器和第二收发器的多输入多出（MIMO）系统中的发送数据速率适配方法。第一收发器向第二收发器发射信号。第二收发器分析所接收信号的信道质量，并使用链路自适应来生成发送模式的最短列表以发送回第一收发信机。第一个收发器循环通过发送模式的最短列表以找到最佳发送模式。

66. 发明授权

US08520571B2 Reconfigurable wireless modem sub-circuits to implement multiple air interface standards 有权
标题翻译：可重配置的无线调制解调器子电路实现多个空中接口标准
公开(公告)号：US08520571B2
公开(公告)日：2013-08-27
申请号：US12396270
申请日：2009-03-02
申请人： Arunava Chaudhuri , Iwen Yao , Jeremy H. Lin , Ali RostamPisheh , Raghu Challa , Hemanth Sampath , Megan Wu , Joseph Zanotelli , Mrinal Nath
发明人： Arunava Chaudhuri , Iwen Yao , Jeremy H. Lin , Ali RostamPisheh , Raghu Challa , Hemanth Sampath , Megan Wu , Joseph Zanotelli , Mrinal Nath
IPC分类号： H04B7/00
CPC分类号： G06F15/7842
摘要： A flexible and reconfigurable digital system (for example, a wireless modem) includes a set of sub-circuits. Each sub-circuit includes a task manager and an amount of configurable hardware circuitry for performing a type of operation on a data stream. The task manager of a sub-circuit can configure and control the configurable hardware of the sub-circuit. A central processor configures and orchestrates operation of the sub-circuits by maintaining a set of task lists in a tightly coupled memory. Each task list includes task instructions for a corresponding sub-circuit. The task manager of a sub-circuit reads task instructions from its task list and controls its associated hardware circuitry as directed by the instructions. A timestamp task instruction and a push task instruction and the task list architecture allow modem sub-circuits to be easily reconfigured to operate in accordance with either a first air interface standard or a second air interface standard.
摘要翻译：灵活和可重新配置的数字系统（例如，无线调制解调器）包括一组子电路。每个子电路包括任务管理器和用于对数据流执行一种操作的可配置硬件电路的量。子电路的任务管理器可以配置和控制子电路的可配置硬件。中央处理器通过在紧耦合存储器中维护一组任务列表来配置和协调子电路的操作。每个任务列表包括相应子电路的任务指令。子电路的任务管理器从其任务列表读取任务指令，并根据指令控制其相关联的硬件电路。时间戳任务指令和推送任务指令以及任务列表架构允许将调制解调器子电路轻松地重新配置为根据第一空中接口标准或第二空中接口标准进行操作。

67. 发明授权

US08520500B2 Buffered demod and demap functions 失效
标题翻译：缓冲解调和解映射功能
公开(公告)号：US08520500B2
公开(公告)日：2013-08-27
申请号：US12407482
申请日：2009-03-19
申请人： Jeremy H. Lin , Arunava Chaudhuri , Raghu N. Challa , Hemanth Sampath
发明人： Jeremy H. Lin , Arunava Chaudhuri , Raghu N. Challa , Hemanth Sampath
IPC分类号： H04J11/00
CPC分类号： H04L25/0202 , H04L5/0007 , H04L5/0023 , H04L27/265
摘要： An apparatus operable in a wireless communication system, the apparatus may include an FFT symbol buffer and a demapping device. The FFT symbol buffer can feed FFT symbol data derived from received communication signals to a channel estimation device and a shared buffer. The channel estimation device can also provide intermediate data to the shared buffer. The intermediate data may be in tile form and can be derived from the FFT symbol data. Further, the intermediate data can be stored in the shared buffer. The demapping device can extract the intermediate data from the shared buffer in various forms including sub-packet form.
摘要翻译：一种在无线通信系统中可操作的装置，该装置可以包括FFT符号缓冲器和解映射装置。 FFT符号缓冲器可以将从接收到的通信信号导出的FFT符号数据馈送到信道估计装置和共享缓冲器。信道估计装置还可以向共享缓冲器提供中间数据。中间数据可以是瓦片形式，并且可以从FFT符号数据导出。此外，中间数据可以存储在共享缓冲器中。解映射设备可以以包括子包形式的各种形式从共享缓冲器提取中间数据。

68. 发明申请

US20130208821A1 SYSTEMS, METHODS, AND DEVICES TO PERFORM INTERLEAVING 有权
标题翻译：系统，方法和设备进行交互
公开(公告)号：US20130208821A1
公开(公告)日：2013-08-15
申请号：US13586667
申请日：2012-08-15
申请人： Lin Yang , Didier Johannes Richard Van Nee , Hemanth Sampath , Sameer Vermani
发明人： Lin Yang , Didier Johannes Richard Van Nee , Hemanth Sampath , Sameer Vermani
IPC分类号： H04L27/26
CPC分类号： H04L27/2608 , H04L1/0071 , H04L5/0044 , H04L27/2601 , H04L27/2602
摘要： An apparatus includes an interleaver configured to interleave encoded data and to output a series of interleaved bits to be transmitted via a 1 MHz orthogonal frequency-division multiplexing (OFDM) transmission. The apparatus also includes a modulator configured to modulate the interleaved bits and a transform module configured to transform the modulated bits. A transmit module of the apparatus is configured to transmit the transformed bits included in one or more spatial streams of the 1 MHz OFDM transmission.
摘要翻译：一种装置包括交织器，被配置为交织编码数据并输出要通过1MHz正交频分复用（OFDM）传输发送的一系列交织比特。该装置还包括配置成调制交错比特的调制器和被配置为变换调制比特的变换模块。该装置的发送模块被配置为发送包括在1MHz OFDM传输的一个或多个空间流中的变换的比特。

69. 发明申请

US20130183906A1 ENHANCED DISTRIBUTED SYNCHRONIZATION FOR WIRELESS COMMUNICATIONS 审中-公开
标题翻译：增强无线通信的分布式同步
公开(公告)号：US20130183906A1
公开(公告)日：2013-07-18
申请号：US13349253
申请日：2012-01-12
申请人： Saurabh Tavildar , Thomas J. Richardson , Simone Merlin , Santosh Paul Abraham , Zhibin Wu , Junyi Li , Nilesh N. Khude , Hemanth Sampath
发明人： Saurabh Tavildar , Thomas J. Richardson , Simone Merlin , Santosh Paul Abraham , Zhibin Wu , Junyi Li , Nilesh N. Khude , Hemanth Sampath
IPC分类号： H04W24/02 , H04W56/00
CPC分类号： H04W56/002
摘要： Methods and apparatus are described which increase the probability and/or frequency that devices with comparatively faster clocks in a network than other devices in the network will transmit beacon signals are described. As a result, devices with faster clocks will tend to drive system synchronization to convergence faster than if all devices transmitted beacons at the same rate, thus facilitating more reliable maintenance of system synchronization since the devices with faster clocks will tend to transmit more frequently.
摘要翻译：描述了提高网络中具有比其他设备在网络中发送信标信号的时间更快的设备的概率和/或频率的方法和装置。因此，具有更快时钟的器件将倾向于将系统同步驱动到收敛速度上比所有器件以相同的速率传输信标的速度更快，从而有助于更可靠地维护系统同步，因为具有更快时钟的器件将倾向于更频繁地传输。

70. 发明授权

US08483337B2 Cancelling interference by determining modulation and coding information embedded in a received spatial stream 失效
标题翻译：通过确定嵌入在接收的空间流中的调制和编码信息来消除干扰
公开(公告)号：US08483337B2
公开(公告)日：2013-07-09
申请号：US13173714
申请日：2011-06-30
申请人： Vincent Knowles Jones , Hemanth Sampath
发明人： Vincent Knowles Jones , Hemanth Sampath
IPC分类号： H03D1/04 , H03D1/06 , H04B1/10
CPC分类号： H04L25/03006 , H04B7/0452 , H04J11/004 , H04L1/0039 , H04L1/0046 , H04L1/0631
摘要： Data-directed interference cancellation involves detecting the modulation and coding embedded in an interfering spatial stream and using the detected modulation and coding for interference cancellation in conjunction with decoding another spatial stream. In an 802.11ac-based system, the modulation and coding scheme of a spatial stream is specified by a SIGB value. Upon detecting the SIGB value of an interfering spatial stream in a received signal, the modulation and coding indicated by the SIGB value is used to identify the information transmitted in the interfering spatial stream. Once this information is known, the interference caused by the transmission of this information is canceled from the received signal to improve the decoding of the other spatial stream (or streams) in the received signal.
摘要翻译：数据干扰消除涉及检测嵌入在干扰空间流中的调制和编码，并结合解码另一空间流，并使用检测到的调制和编码来进行干扰消除。在基于802.11ac的系统中，空间流的调制和编码方案由SIGB值指定。在检测到接收信号中的干扰空间流的SIGB值时，由SIGB值指示的调制和编码用于识别在干扰空间流中发送的信息。一旦知道该信息，则从接收到的信号中消除由该信息的发送引起的干扰，以改善接收信号中其它空间流（或数据流）的解码。

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