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1. 发明授权

US08873365B2 Transmit diversity processing for a multi-antenna communication system 有权
标题翻译：多天线通信系统的发射分集处理
公开(公告)号：US08873365B2
公开(公告)日：2014-10-28
申请号：US12490993
申请日：2009-06-24
申请人： J. Rodney Walton , John W. Ketchum , Mark S. Wallace , Steven J. Howard
发明人： J. Rodney Walton , John W. Ketchum , Mark S. Wallace , Steven J. Howard
IPC分类号： H04J11/00 , H04L27/26 , H04L1/00 , H04L25/02 , H04L25/03 , H04B7/06 , H04B7/08 , H04L1/06 , H04W28/20 , H04L1/16 , H04L1/08 , H04W52/50
CPC分类号： H04L27/261 , H04B7/0669 , H04B7/0697 , H04B7/0854 , H04L1/0003 , H04L1/0009 , H04L1/0017 , H04L1/0059 , H04L1/0061 , H04L1/0069 , H04L1/0071 , H04L1/0618 , H04L1/08 , H04L1/16 , H04L25/0224 , H04L25/0226 , H04L25/0242 , H04L25/03343 , H04L27/2601 , H04L27/2602 , H04L27/2647 , H04L2001/0093 , H04W28/20 , H04W52/50
摘要： For transmit diversity in a multi-antenna OFDM system, a transmitter encodes, interleaves, and symbol maps traffic data to obtain data symbols. The transmitter processes each pair of data symbols to obtain two pairs of transmit symbols for transmission from a pair of antennas either (1) in two OFDM symbol periods for space-time transmit diversity or (2) on two subbands for space-frequency transmit diversity. NT·(NT−1)/2 different antenna pairs are used for data transmission, with different antenna pairs being used for adjacent subbands, where NT is the number of antennas. The system may support multiple OFDM symbol sizes. The same coding, interleaving, and modulation schemes are used for different OFDM symbol sizes to simplify the transmitter and receiver processing. The transmitter performs OFDM modulation on the transmit symbol stream for each antenna in accordance with the selected OFDM symbol size. The receiver performs the complementary processing.
摘要翻译：对于多天线OFDM系统中的发射分集，发射机对业务数据进行编码，交织和符号映射以获得数据符号。发射机处理每对数据符号以获得两对发射符号，用于在两个用于空时传输分集的OFDM符号周期中的一个天线（1）或（2）用于空间 - 频率发射分集的两个子带上从一对天线发射。 NT·（NT-1）/ 2个不同的天线对用于数据传输，不同的天线对用于相邻子带，其中NT是天线数。该系统可以支持多个OFDM符号大小。对于不同的OFDM符号大小使用相同的编码，交织和调制方案来简化发射机和接收机处理。发射机根据所选择的OFDM符号大小对每个天线的发射符号流执行OFDM调制。接收机执行补充处理。

2. 发明授权

US08615053B2 Mode and rate control for MIMO transmission 有权
标题翻译： MIMO传输的模式和速率控制
公开(公告)号：US08615053B2
公开(公告)日：2013-12-24
申请号：US13277444
申请日：2011-10-20
申请人： Mark S Wallace , J Rodney Walton
发明人： Mark S Wallace , J Rodney Walton
IPC分类号： H04B7/02 , H04L1/02
CPC分类号： H04B7/043 , H04L1/0002 , H04L5/0007 , H04L25/0224
摘要： Techniques for performing mode and rate control for a MIMO transmission are described. For mode selection, the use of an eigensteering mode is permitted if a first set of at least one criterion is satisfied. The eigensteering mode is selected for data transmission if a second set of at least one criterion is satisfied, and an unsteered mode is selected otherwise. For rate selection, SNR estimates are derived for data streams to potentially transmit, e.g., based on channel estimates and/or data symbol estimates. The number of data streams to transmit as well as at least one rate for at least one data stream to transmit are selected based on the SNR estimates and at least one backoff factor. The backoff factor(s) are adjusted based on status of received packets. The at least one rate may be adjusted based on the age of rate information. Other aspects, features, and embodiments are also claimed and described.
摘要翻译：描述了用于执行MIMO传输的模式和速率控制的技术。对于模式选择，如果满足至少一个标准的第一组，则允许使用本征转向模式。如果满足至少一个标准的第二组，则选择本征转向模式用于数据传输，否则选择非导向模式。对于速率选择，导出用于例如基于信道估计和/或数据符号估计可能传输的数据流的SNR估计。基于SNR估计和至少一个退避因子来选择要发送的数据流的数量以及用于要发送的至少一个数据流的至少一个速率。基于接收到的分组的状态来调整退避因子。可以基于速率信息的年龄来调整至少一个速率。还要求和描述其它方面，特征和实施例。

3. 发明授权

US08576846B2 Peer-to-peer communication in ad hoc wireless network 有权
公开(公告)号：US08576846B2
公开(公告)日：2013-11-05
申请号：US11538222
申请日：2006-10-03
申请人： Ravi Kumar , J. Rodney Walton , Qiang Fu , Subrahmanyam Dravida
发明人： Ravi Kumar , J. Rodney Walton , Qiang Fu , Subrahmanyam Dravida
IPC分类号： H04L12/56
CPC分类号： H04W76/11 , H04L63/0428 , H04W8/005 , H04W12/04 , H04W12/06 , H04W28/0268 , H04W48/16 , H04W84/18
摘要： For a peer-to-peer call in an ad hoc wireless network, a wireless device performs discovery of a target wireless device, performs authentication of the target wireless device and generates a session key (e.g., using a pre-shared key or a certificate provisioned on the wireless device), forms an ad hoc wireless network with the target wireless device, and communicates peer-to-peer with the target wireless device via the ad hoc wireless network. The wireless device may perform discovery with a list of identifiers for wireless devices designated to communicate with this wireless device. The wireless device may derive a service set identifier (SSID) used to identify the ad hoc wireless network based on its user-specific identifier (e.g., its phone number) and/or a user-specific identifier for the target wireless device. The wireless device may also performs IP address discovery using the user-specific identifier for the target wireless device.

4. 发明授权

US08570988B2 Channel calibration for a time division duplexed communication system 有权
标题翻译：时分双工通信系统的通道校准
公开(公告)号：US08570988B2
公开(公告)日：2013-10-29
申请号：US11045781
申请日：2005-01-27
申请人： Mark S. Wallace , John W. Ketchum , J. Rodney Walton , Steven J. Howard
发明人： Mark S. Wallace , John W. Ketchum , J. Rodney Walton , Steven J. Howard
IPC分类号： H04B7/00 , H04L29/02
CPC分类号： H04W52/50 , H04B7/0421 , H04B7/0615 , H04B7/0619 , H04B7/0669 , H04B7/0697 , H04B7/0854 , H04B17/21 , H04L1/0001 , H04L1/0003 , H04L1/0009 , H04L1/0017 , H04L1/0059 , H04L1/0061 , H04L1/0068 , H04L1/0071 , H04L1/06 , H04L1/0618 , H04L1/08 , H04L1/16 , H04L5/1469 , H04L25/0204 , H04L25/0224 , H04L25/0226 , H04L25/0242 , H04L25/0244 , H04L25/03343 , H04L27/2601 , H04L27/2602 , H04L27/261 , H04L27/2647 , H04L2001/0093 , H04L2025/03414 , H04L2025/03426 , H04W16/28 , H04W52/42
摘要： Techniques are described to calibrate the downlink and uplink channels to account for differences in the frequency responses of the transmit and receive chains at an access point and a user terminal. In one method, pilots are transmitted on the downlink and uplink channels and used to derive estimates of the downlink and uplink channel responses, respectively. Correction factors for the access point and correction factors for the user terminal are determined based on (e.g., by performing matrix-ratio computation or minimum mean square error (MMSE) computation on) the downlink and uplink channel response estimates. The correction factors for the access point and the correction factors for the user terminal are used to obtain a calibrated downlink channel and a calibrated uplink channel, which are transpose of one another. The calibration may be performed in real time based on over-the-air transmission.
摘要翻译：描述技术来校准下行链路和上行链路信道以解决在接入点和用户终端处的发射和接收链的频率响应的差异。在一种方法中，导频在下行链路和上行链路信道上传输，并用于分别导出下行链路和上行链路信道响应的估计。基于（例如，通过对下行链路和上行链路信道响应估计执行矩阵比计算或最小均方误差（MMSE）计算）来确定用于接入点的校正因子和用户终端的校正因子。用于接入点的校正因子和用户终端的校正因子被用于获得经校准的下行链路信道和被校准的上行链路信道，这些信道彼此相互转置。可以基于空中传输实时地进行校准。

5. 发明授权

US08462709B2 Multiple frequency band operation in wireless networks 有权
标题翻译：无线网络中的多频段操作
公开(公告)号：US08462709B2
公开(公告)日：2013-06-11
申请号：US12507850
申请日：2009-07-23
申请人： Sanjiv Nanda , Shravan K. Surineni , J. Rodney Walton
发明人： Sanjiv Nanda , Shravan K. Surineni , J. Rodney Walton
IPC分类号： H04W4/00
CPC分类号： H04W72/02 , H04W16/14 , H04W24/00 , H04W76/10
摘要： Embodiments for bandwidth allocation methods, detecting interference with other systems, and/or redeploying in alternate bandwidth are described. Higher bandwidth channels may be deployed at channel boundaries (410), which are a subset of those for lower bandwidth channels (310), and may be restricted from overlapping. Interference may be detected (930) on primary, secondary, or a combination of channels, and may be detected in response to energy measurements (910) of the various channels. When interference is detected, a higher bandwidth Basic Service Set (BSS)(100) may be relocated to an alternate channel, or may have its bandwidth reduced to avoid interference. Interference may be detected based on energy measured on the primary or secondary channel, and/or a difference between the two. An FFT (1010) may be used in energy measurement in either or both of the primary and secondary channels. Stations may also monitor messages from alternate systems to make channel allocation decisions. Various other aspects are also presented.
摘要翻译：描述带宽分配方法的实施例，检测与其他系统的干扰和/或以备用带宽重新部署。较高带宽信道可以部署在作为较低带宽信道（310）的子集的信道边界（410）处，并且可以被限制以重叠。可以在主要，次要或信道的组合上检测（930）干扰，并且可以响应于各种信道的能量测量（910）来检测干扰。当检测到干扰时，可以将更高带宽的基本业务集（BSS）（100）重新定位到备用信道，或者可以减少其带宽以避免干扰。可以基于在主要或次要信道上测量的能量和/或两者之间的差异来检测干扰。可以在主要和次要信道中的一个或两个中的能量测量中使用FFT（1010）。站点还可以监视来自备用系统的消息以进行信道分配决定。还提出了各种其他方面。

6. 发明授权

US08462643B2 MIMO WLAN system 有权
公开(公告)号：US08462643B2
公开(公告)日：2013-06-11
申请号：US12112816
申请日：2008-07-15
申请人： J. Rodney Walton , Mark S. Wallace , John W. Ketchum , Steven J. Howard
发明人： J. Rodney Walton , Mark S. Wallace , John W. Ketchum , Steven J. Howard
IPC分类号： H04J1/16
CPC分类号： H04L5/0048 , H04B7/022 , H04B7/0421 , H04B7/043 , H04B7/0443 , H04B7/0669 , H04B7/0689 , H04B7/0697 , H04B7/0854 , H04B7/0871 , H04L1/0003 , H04L1/0009 , H04L1/0017 , H04L1/0025 , H04L1/0059 , H04L1/0061 , H04L1/0069 , H04L1/0071 , H04L1/0606 , H04L1/0625 , H04L1/0656 , H04L1/08 , H04L1/16 , H04L1/1887 , H04L5/0023 , H04L25/0204 , H04L25/0226 , H04L25/0228 , H04L25/0248 , H04L25/03343 , H04L27/2602 , H04L27/2607 , H04L27/2647 , H04L2025/03414 , H04L2025/03426 , H04W28/20 , H04W28/22 , H04W52/42 , H04W52/50 , H04W72/12 , H04W84/12
摘要： A multiple-access MIMO WLAN system that employs MIMO, OFDM, and TDD. The system (1) uses a channel structure with a number of configurable transport channels, (2) supports multiple rates and transmission modes, which are configurable based on channel conditions and user terminal capabilities, (3) employs a pilot structure with several types of pilot (e.g., beacon, MIMO, steered reference, and carrier pilots) for different functions, (4) implements rate, timing, and power control loops for proper system operation, and (5) employs random access for system access by the user terminals, fast acknowledgment, and quick resource assignments. Calibration may be performed to account for differences in the frequency responses of transmit/receive chains at the access point and user terminals. The spatial processing may then be simplified by taking advantage of the reciprocal nature of the downlink and uplink and the calibration.

7. 发明授权

US08248978B2 Detection of stations for wireless communication 有权
标题翻译：无线通信站检测
公开(公告)号：US08248978B2
公开(公告)日：2012-08-21
申请号：US11536193
申请日：2006-09-28
申请人： Xiandong Zhang , Mark S. Wallace , J. Rodney Walton
发明人： Xiandong Zhang , Mark S. Wallace , J. Rodney Walton
IPC分类号： G08C17/00
CPC分类号： H04W8/005 , H04W52/0216 , H04W84/12 , H04W84/18 , Y02D70/142 , Y02D70/22 , Y02D70/24 , Y02D70/25
摘要： Techniques for detecting other stations in a power efficient manner are described. A station may operate in a passive mode or a search mode. In the passive mode, the station receives for one receive period in each time interval. In the search mode, the station transmits for a series of transmit periods in one time interval, then receives for one receive period in the next time interval, and repeats the transmit/receive cycle. In an example scenario, station A operates in the search mode and sends a series of transmissions during its transmit periods. Station B operates in the passive mode, receives a transmission from station A during its receive period, switches to the search mode, and sends a series of transmissions for one time interval. Station A receives a transmission from station B during its receive period. After detecting one another, stations A and B may perform synchronization.
摘要翻译：描述了以功率有效的方式检测其他站的技术。站可以在被动模式或搜索模式下操作。在被动模式下，站在每个时间间隔内接收一个接收周期。在搜索模式下，站在一个时间间隔内发送一系列发送周期，然后在下一个时间间隔内接收一个接收周期，并重复发送/接收周期。在示例情况下，站A在搜索模式下操作并且在其发送周期期间发送一系列传输。站B以被动模式操作，在其接收周期期间从站A接收传输，切换到搜索模式，并发送一系列传输一段时间。站A在其接收期间接收来自站B的传输。在彼此检测到之后，站A和B可以执行同步。

8. 发明授权

US08169889B2 Transmit diversity and spatial spreading for an OFDM-based multi-antenna communication system 有权
标题翻译：基于OFDM的多天线通信系统的发射分集和空间扩展
公开(公告)号：US08169889B2
公开(公告)日：2012-05-01
申请号：US10794918
申请日：2004-03-05
申请人： J. Rodney Walton , John W. Ketchum , Mark S. Wallace , Steven J. Howard , Sanjiv Nanda
发明人： J. Rodney Walton , John W. Ketchum , Mark S. Wallace , Steven J. Howard , Sanjiv Nanda
IPC分类号： H04J11/00
CPC分类号： H04B7/0615 , H04B7/0413 , H04L27/2602
摘要： A multi-antenna transmitting entity transmits data to a single- or multi-antenna receiving entity using (1) a steered mode to direct the data transmission toward the receiving entity or (2) a pseudo-random transmit steering (PRTS) mode to randomize the effective channels observed by the data transmission across the subbands. The PRTS mode may be used to achieve transmit diversity or spatial spreading. For transmit diversity, the transmitting entity uses different pseudo-random steering vectors across the subbands but the same steering vector across a packet for each subband. The receiving entity does not need to have knowledge of the pseudo-random steering vectors or perform any special processing. For spatial spreading, the transmitting entity uses different pseudo-random steering vectors across the subbands and different steering vectors across the packet for each subband. Only the transmitting and receiving entities know the steering vectors used for data transmission.
摘要翻译：多天线发射实体使用（1）向接收实体指导数据传输的导向模式或（2）伪随机发射转向（PRTS）模式来将数据发送到单天线或多天线接收实体，以随机化通过子带上的数据传输观察到的有效信道。 PRTS模式可以用于实现发射分集或空间扩展。对于发射分集，发射实体在子带上使用不同的伪随机导引向量，但是在每个子带的分组上使用相同的导向向量。接收实体不需要具有伪随机导引向量的知识或执行任何特殊处理。对于空间扩展，发射实体在子带上使用不同的伪随机导引向量，并且跨每个子带的分组使用不同的导向矢量。只有发送和接收实体知道用于数据传输的导向向量。

9. 发明授权

US08145179B2 Data detection and demodulation for wireless communication systems 有权
标题翻译：无线通信系统的数据检测和解调
公开(公告)号：US08145179B2
公开(公告)日：2012-03-27
申请号：US11932703
申请日：2007-10-31
申请人： J. Rodney Walton , Mark S. Wallace
发明人： J. Rodney Walton , Mark S. Wallace
IPC分类号： H04B7/08 , H04B1/16 , H04B1/00 , H04L27/00 , H04L27/06
CPC分类号： H04L1/0059 , H04B7/0669 , H04B7/0697 , H04B7/0854 , H04L1/0001 , H04L1/0003 , H04L1/0009 , H04L1/0017 , H04L1/0061 , H04L1/0068 , H04L1/0071 , H04L1/06 , H04L1/0618 , H04L1/08 , H04L1/16 , H04L25/0224 , H04L25/0226 , H04L25/0242 , H04L25/03343 , H04L27/0012 , H04L27/2601 , H04L27/2602 , H04L27/261 , H04L27/2647 , H04L2001/0093 , H04W28/20 , H04W52/50
摘要： Techniques for detecting and demodulating data transmissions in wireless communication systems are presented. In one aspect, a decision-directed detector detects for data transmissions in a received signal by utilizing received data symbols as well as received pilot symbols. The decision-directed detector may be designed to perform differential detection in the frequency domain or coherent detection in the time domain, and may be used with multi-carrier modulation (e.g., OFDM). In another aspect, an adaptive threshold is used to perform detection of received data transmissions. A threshold may be determined for each data transmission hypothesized to have been received. The threshold may be computed, for example, based on the signal plus noise energy of the hypothesized data transmission.
摘要翻译：提出了用于检测和解调无线通信系统中的数据传输的技术。在一个方面，决策导向检测器通过利用接收到的数据符号以及接收到的导频符号来检测接收信号中的数据传输。决策导向检测器可以被设计为在时域中执行差分检测或相干检测，并且可以与多载波调制（例如，OFDM）一起使用。在另一方面，使用自适应阈值来执行接收的数据传输的检测。可以针对已经接收到的假设的每个数据传输确定阈值。阈值可以例如基于假设的数据传输的信号加噪声能量来计算。

10. 发明申请

US20120033618A1 MODE AND RATE CONTROL FOR MIMO TRANSMISSION 有权
标题翻译： MIMO传输的模式和速率控制
公开(公告)号：US20120033618A1
公开(公告)日：2012-02-09
申请号：US13277444
申请日：2011-10-20
申请人： Mark S. Wallace , J. Rodney Walton
发明人： Mark S. Wallace , J. Rodney Walton
IPC分类号： H04W4/00
CPC分类号： H04B7/043 , H04L1/0002 , H04L5/0007 , H04L25/0224
摘要： Techniques for performing mode and rate control for a MIMO transmission are described. For mode selection, the use of an eigensteering mode is permitted if a first set of at least one criterion is satisfied. The eigensteering mode is selected for data transmission if a second set of at least one criterion is satisfied, and an unsteered mode is selected otherwise. For rate selection, SNR estimates are derived for data streams to potentially transmit, e.g., based on channel estimates and/or data symbol estimates. The number of data streams to transmit as well as at least one rate for at least one data stream to transmit are selected based on the SNR estimates and at least one backoff factor. The backoff factor(s) are adjusted based on status of received packets. The at least one rate may be adjusted based on the age of rate information. Other aspects, features, and embodiments are also claimed and described.
摘要翻译：描述了用于执行MIMO传输的模式和速率控制的技术。对于模式选择，如果满足至少一个标准的第一组，则允许使用本征转向模式。如果满足至少一个标准的第二组，则选择本征转向模式用于数据传输，否则选择非导向模式。对于速率选择，导出用于例如基于信道估计和/或数据符号估计可能传输的数据流的SNR估计。基于SNR估计和至少一个退避因子来选择要发送的数据流的数量以及用于要发送的至少一个数据流的至少一个速率。基于接收到的分组的状态来调整退避因子。可以基于速率信息的年龄来调整至少一个速率。还要求和描述其它方面，特征和实施例。

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