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1. 发明授权

US09548851B2 Multi-antenna transmission for spatial division multiple access 有权
标题翻译：用于空分多址的多天线传输
公开(公告)号：US09548851B2
公开(公告)日：2017-01-17
申请号：US11869547
申请日：2007-10-09
申请人： J. Rodney Walton , John W. Ketchum , John Edward Smee , Mark S. Wallace , Steven J. Howard
发明人： J. Rodney Walton , John W. Ketchum , John Edward Smee , Mark S. Wallace , Steven J. Howard
IPC分类号： H04B7/02 , H04L5/02 , H04B1/7107 , H04B7/04 , H04B7/06
CPC分类号： H04B7/043 , H04B1/71072 , H04B7/0408 , H04B7/0413 , H04B7/0421 , H04B7/0617 , H04B7/0619 , H04B7/0697 , H04B17/309 , H04L5/023 , H04W16/28
摘要： An uplink channel response matrix is obtained for each terminal and decomposed to obtain a steering vector used by the terminal to transmit on the uplink. An “effective” uplink channel response vector is formed for each terminal based on its steering vector and its channel response matrix. Multiple sets of terminals are evaluated based on their effective channel response vectors to determine the best set (e.g., with highest overall throughput) for uplink transmission. Each selected terminal performs spatial processing on its data symbol stream with its steering vector and transmits its spatially processed data symbol stream to an access point. The multiple selected terminals simultaneously transmit their data symbol streams via their respective MIMO channels to the access point. The access point performs receiver spatial processing on its received symbol streams in accordance with a receiver spatial processing technique to recover the data symbol streams transmitted by the selected terminals.
摘要翻译：获得每个终端的上行链路信道响应矩阵，并对其进行分解，得到终端在上行链路上使用的导向矢量。基于其导向向量及其信道响应矩阵，为每个终端形成“有效”上行链路信道响应向量。基于其有效信道响应向量来评估多组终端，以确定用于上行链路传输的最佳集合（例如具有最高总吞吐量）。每个选择的终端利用其导向向量对其数据符号流执行空间处理，并将其空间处理的数据符号流发送到接入点。多个选择的终端通过其相应的MIMO信道同时将其数据符号流发送到接入点。接入点根据接收机空间处理技术对其接收到的符号流执行接收机空间处理，以恢复由所选终端发送的数据符号流。

2. 发明授权

US09240871B2 MIMO WLAN system 有权
公开(公告)号：US09240871B2
公开(公告)日：2016-01-19
申请号：US12112789
申请日：2008-04-30
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： H04B7/06 , H04B7/08 , H04L5/00 , H04B7/02 , H04B7/04 , H04L1/00 , H04L1/06 , H04L1/18 , H04L25/02 , H04L25/03 , H04L27/26 , H04W72/12 , H04W28/20 , H04L1/08 , H04L1/16 , H04W28/22 , H04W52/42 , H04W52/50 , H04W84/12
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.

3. 发明授权

US08934329B2 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：US08934329B2
公开(公告)日：2015-01-13
申请号：US11250353
申请日：2005-10-13
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 , H04B7/06 , H04B7/08 , H04L1/00 , H04L1/06 , H04L25/02 , H04L25/03 , H04L1/08 , H04L1/16 , H04W28/20 , 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。

4. 发明授权

US08909174B2 Continuous beamforming for a MIMO-OFDM system 有权
标题翻译：用于MIMO-OFDM系统的连续波束成形
公开(公告)号：US08909174B2
公开(公告)日：2014-12-09
申请号：US12533765
申请日：2009-07-31
申请人： Steven J. Howard , Jay Rodney Walton , Mark S. Wallace
发明人： Steven J. Howard , Jay Rodney Walton , Mark S. Wallace
IPC分类号： H04B7/02 , H04B7/06 , H04B7/04
CPC分类号： H04B7/0617 , H04B7/0408 , H04B7/0417 , H04B7/0626 , H04B7/0671
摘要： A transmitting entity performs spatial processing on data symbols for each subband with an eigenmode matrix, a steering matrix, or an identity matrix to obtain spatially processed symbols for the subband. The data symbols may be sent on orthogonal spatial channels with the eigenmode matrix, on different spatial channels with the steering matrix, or from different transmit antennas with the identity matrix. The transmitting entity further performs beamforming on the spatially processed symbols, in the frequency domain or time domain, prior to transmission from the multiple transmit antennas. A receiving entity performs the complementary processing to recover the data symbols sent by the transmitting entity. The receiving entity may derive a spatial filter matrix for each subband based on a MIMO channel response matrix for that subband and perform receiver spatial processing for the subband with the spatial filter matrix.
摘要翻译：发送实体对具有本征模式矩阵，导向矩阵或单位矩阵的每个子带的数据符号执行空间处理，以获得子带的空间处理符号。数据符号可以在具有本征模式矩阵的正交空间信道上，在具有导引矩阵的不同空间信道上，或者从具有单位矩阵的不同发射天线发送。在从多个发射天线的发射之前，发射实体在频域或时域中进一步对空间处理的符号执行波束成形。接收实体执行补充处理以恢复由发送实体发送的数据符号。接收实体可以基于该子带的MIMO信道响应矩阵为每个子带导出空间滤波器矩阵，并且对于具有空间滤波器矩阵的子带执行接收机空间处理。

5. 发明授权

US08711763B2 Random access for wireless multiple-access communication systems 有权
标题翻译：无线多址通信系统的随机接入
公开(公告)号：US08711763B2
公开(公告)日：2014-04-29
申请号：US13353924
申请日：2012-01-19
申请人： Jay Rodney Walton , John W. Ketchum , Mark S. Wallace , Steven J. Howard
发明人： Jay Rodney Walton , John W. Ketchum , Mark S. Wallace , Steven J. Howard
IPC分类号： H04W72/00 , H04W74/08 , H04W74/00 , H04W88/06
CPC分类号： H04W74/0833 , H04B7/0413 , H04B7/043 , H04B7/0669 , H04B7/0697 , H04B7/0854 , H04L1/0001 , H04L1/0009 , H04L1/0017 , H04L1/0059 , H04L1/0061 , H04L1/0068 , H04L1/0071 , H04L1/0618 , H04L1/08 , H04L1/16 , H04L25/0224 , H04L25/0226 , H04L25/0242 , H04L25/03343 , H04L27/2601 , H04L27/2602 , H04L27/261 , H04L27/2647 , H04L2001/0093 , H04W28/20 , H04W52/50 , H04W74/002 , H04W74/08 , H04W74/0866 , H04W88/06
摘要： Techniques for facilitating random access in wireless multiple-access communication systems are described. A random access channel (RACH) is defined to comprise a “fast” RACH (F-RACH) and a “slow” RACH (S-RACH). The F-RACH and S-RACH can efficiently support user terminals in different operating states and employ different designs. The F-RACH can be used to quickly access the system, and the S-RACH is more robust and can support user terminals in various operating states and conditions. The F-RACH may be used by user terminals that have registered with the system and can compensate for their round trip delays (RTDs) by properly advancing their transmit timing. The S-RACH may be used by user terminals that may or may not have registered with the system, and may or may not be able to compensate for their RTDs. Other aspects, embodiments, and features are also claimed and described.
摘要翻译：描述了用于促进无线多址通信系统中的随机接入的技术。随机接入信道（RACH）被定义为包括“快速”RACH（F-RACH）和“慢”RACH（S-RACH）。 F-RACH和S-RACH可以有效地支持不同操作状态的用户终端，并采用不同的设计。 F-RACH可以用于快速访问系统，而S-RACH更加强大，可以支持各种操作状态和条件下的用户终端。 F-RACH可以由已经向系统注册的用户终端使用，并且可以通过适当地提前发送定时来补偿它们的往返延迟（RTD）。 S-RACH可以由可能已经或可能没有在系统中注册的用户终端使用，并且可以或可能不能够补偿它们的RTD。还要求和描述其它方面，实施例和特征。

6. 发明授权

US08489107B2 Method and apparatus for allocating downlink resources in a multiple-input multiple-output (MIMO) communication system 有权
标题翻译：用于在多输入多输出（MIMO）通信系统中分配下行链路资源的方法和装置
公开(公告)号：US08489107B2
公开(公告)日：2013-07-16
申请号：US13030183
申请日：2011-02-18
申请人： J. Rodney Walton , Mark S. Wallace , Steven J. Howard
发明人： J. Rodney Walton , Mark S. Wallace , Steven J. Howard
IPC分类号： H04Q7/20
CPC分类号： H04W16/00 , H04B7/0417 , H04B7/0452 , H04B7/061 , H04L1/0003 , H04L1/0009 , H04L1/0026 , H04L1/06 , H04L25/0204 , H04L2025/03426 , H04W16/28 , H04W84/14
摘要： Techniques to schedule downlink data transmission to a number of terminals in a wireless communication system. In one method, one or more sets of terminals are formed for possible data transmission, with each set including a unique combination of one or more terminals and corresponding to a hypothesis to be evaluated. One or more sub-hypotheses may further be formed for each hypothesis, with each sub-hypothesis corresponding to specific assignments of a number of transmit antennas to the one or more terminals in the hypothesis. The performance of each sub-hypothesis is then evaluated, and one of the evaluated sub-hypotheses is selected based on their performance. The terminal(s) in the selected sub-hypothesis are then scheduled for data transmission, and data is thereafter coded, modulated, and transmitted to each scheduled terminal from one or more transmit antennas assigned to the terminal.
摘要翻译：将无线通信系统中的下行链路数据传输调度到多个终端的技术。在一种方法中，形成一组或多组终端用于可能的数据传输，每组包括一个或多个终端的唯一组合，并对应于待评估的假设。可以针对每个假设进一步形成一个或多个子假设，其中每个子假设对应于假设中的一个或多个终端的多个发射天线的特定分配。然后评估每个子假设的性能，并根据其性能选择评估的子假设之一。然后将所选子假设中的终端调度用于数据传输，然后将数据从分配给终端的一个或多个发射天线编码，调制并发送到每个调度终端。

7. 发明申请

US20120140664A1 RANDOM ACCESS FOR WIRELESS MULTIPLE-ACCESS COMMUNICATION SYSTEMS 有权
标题翻译：无线多路访问通信系统的随机访问
公开(公告)号：US20120140664A1
公开(公告)日：2012-06-07
申请号：US13353924
申请日：2012-01-19
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： H04W24/00 , H04W74/08
CPC分类号： H04W74/0833 , H04B7/0413 , H04B7/043 , H04B7/0669 , H04B7/0697 , H04B7/0854 , H04L1/0001 , H04L1/0009 , H04L1/0017 , H04L1/0059 , H04L1/0061 , H04L1/0068 , H04L1/0071 , H04L1/0618 , H04L1/08 , H04L1/16 , H04L25/0224 , H04L25/0226 , H04L25/0242 , H04L25/03343 , H04L27/2601 , H04L27/2602 , H04L27/261 , H04L27/2647 , H04L2001/0093 , H04W28/20 , H04W52/50 , H04W74/002 , H04W74/08 , H04W74/0866 , H04W88/06
摘要： Techniques for facilitating random access in wireless multiple-access communication systems are described. A random access channel (RACH) is defined to comprise a “fast” RACH (F-RACH) and a “slow” RACH (S-RACH). The F-RACH and S-RACH can efficiently support user terminals in different operating states and employ different designs. The F-RACH can be used to quickly access the system, and the S-RACH is more robust and can support user terminals in various operating states and conditions. The F-RACH may be used by user terminals that have registered with the system and can compensate for their round trip delays (RTDs) by properly advancing their transmit timing. The S-RACH may be used by user terminals that may or may not have registered with the system, and may or may not be able to compensate for their RTDs. Other aspects, embodiments, and features are also claimed and described.
摘要翻译：描述了用于促进无线多址通信系统中的随机接入的技术。随机接入信道（RACH）被定义为包括“快速”RACH（F-RACH）和“慢”RACH（S-RACH）。 F-RACH和S-RACH可以有效地支持不同操作状态的用户终端，并采用不同的设计。 F-RACH可以用于快速访问系统，而S-RACH更加强大，可以支持各种操作状态和条件下的用户终端。 F-RACH可以由已经向系统注册的用户终端使用，并且可以通过适当地提前发送定时来补偿它们的往返延迟（RTD）。 S-RACH可以由可能已经或可能没有在系统中注册的用户终端使用，并且可以或可能不能够补偿它们的RTD。还要求和描述其它方面，实施例和特征。

8. 发明申请

US20120114019A1 RANGE EXTENSION TECHNIQUES FOR A WIRELESS LOCAL AREA NETWORK 有权
标题翻译：无线局域网的范围扩展技术
公开(公告)号：US20120114019A1
公开(公告)日：2012-05-10
申请号：US13277456
申请日：2011-10-20
申请人： Mark S. Wallace , Jay Rodney Walton
发明人： Mark S. Wallace , Jay Rodney Walton
IPC分类号： H04B1/709 , H04B1/707
CPC分类号： H04L27/0014 , H04L27/2613 , H04L27/2656 , H04L27/2657 , H04L27/2675 , H04L27/2676 , H04W74/02 , H04W84/12 , H04W88/04
摘要： Techniques for extending transmission range in a WLAN are described. In an aspect, a receiving station determines the frequency error between a transmitting station and the receiving station based on one or more initial packet transmissions and corrects this frequency error for subsequent packet transmissions received from the transmitting station. The residual frequency error is small after correcting for the frequency error and allows the receiving station to perform coherent accumulation/integration over a longer time interval to detect for a packet transmission. The longer coherent accumulation interval improves detection performance, especially at low SNRs for extended transmission range. The techniques may be used whenever the receiving station knows the identity of the transmitting station, e.g., if the subsequent packet transmissions are scheduled. Other aspects, features, and embodiments are also claimed and described.
摘要翻译：描述了在WLAN中扩展传输范围的技术。在一方面，接收站基于一个或多个初始分组传输来确定发射站和接收站之间的频率误差，并且校正该频率误差以用于从发射台接收的后续分组传输。在校正频率误差之后，剩余频率误差较小，并且允许接收站在更长的时间间隔上执行相干累积/积分以检测分组传输。较长的相干累加间隔提高了检测性能，特别是在扩展传输范围的低SNR时。每当接收站知道发射台的身份时，例如如果后续分组传输被调度，则可以使用这些技术。还要求和描述其它方面，特征和实施例。

9. 发明授权

US08169944B2 Random access for wireless multiple-access communication systems 有权
标题翻译：无线多址通信系统的随机接入
公开(公告)号：US08169944B2
公开(公告)日：2012-05-01
申请号：US10693532
申请日：2003-10-23
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： H04W4/00
CPC分类号： H04W74/0833 , H04B7/0413 , H04B7/043 , H04B7/0669 , H04B7/0697 , H04B7/0854 , H04L1/0001 , H04L1/0009 , H04L1/0017 , H04L1/0059 , H04L1/0061 , H04L1/0068 , H04L1/0071 , H04L1/0618 , H04L1/08 , H04L1/16 , H04L25/0224 , H04L25/0226 , H04L25/0242 , H04L25/03343 , H04L27/2601 , H04L27/2602 , H04L27/261 , H04L27/2647 , H04L2001/0093 , H04W28/20 , H04W52/50 , H04W74/002 , H04W74/08 , H04W74/0866 , H04W88/06
摘要： Techniques for facilitating random access in wireless multiple-access communication systems. A random access channel (RACH) is defined to comprise a “fast” RACH (F-RACH) and a “slow” RACH (S-RACH). The F-RACH and S-RACH can efficiently support user terminals in different operating states and employ different designs. The F-RACH can be used to quickly access the system, and the S-RACH is more robust and can support user terminals in various operating states and conditions. The F-RACH may be used by user terminals that have registered with the system and can compensate for their round trip delays (RTDs) by properly advancing their transmit timing. The S-RACH may be used by user terminals that may or may not have registered with the system, and may or may not be able to compensate for their RTDs. The user terminals may use the F-RACH or S-RACH, or both, to gain access to the system.
摘要翻译：用于促进无线多址通信系统中的随机接入的技术。随机接入信道（RACH）被定义为包括“快速”RACH（F-RACH）和“慢”RACH（S-RACH）。 F-RACH和S-RACH可以有效地支持不同操作状态的用户终端，并采用不同的设计。 F-RACH可以用于快速访问系统，而S-RACH更加强大，可以支持各种操作状态和条件下的用户终端。 F-RACH可以由已经向系统注册的用户终端使用，并且可以通过适当地提前发送定时来补偿它们的往返延迟（RTD）。 S-RACH可以由可能已经或可能没有在系统中注册的用户终端使用，并且可以或可能不能够补偿它们的RTD。用户终端可以使用F-RACH或S-RACH或两者来获得对系统的访问。

10. 发明授权

US08134976B2 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：US08134976B2
公开(公告)日：2012-03-13
申请号：US10693169
申请日：2003-10-23
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： H04W4/00 , H04L7/00 , H04B17/00
CPC分类号： H04B7/0421 , H04B7/0615 , H04B7/0619 , H04B7/0669 , H04B7/0697 , H04B7/0854 , H04B17/336 , H04L1/00 , 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 , H04L25/0224 , H04L25/0226 , H04L25/0242 , H04L25/03006 , H04L25/03343 , H04L27/2601 , H04L27/2602 , H04L27/261 , H04L27/2647 , H04L2001/0093 , H04W16/28 , H04W52/50 , H04W74/04
摘要： Techniques 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 embodiment, pilots are transmitted on the downlink and uplink channels and used to derive estimates of the downlink and uplink channel responses, respectively. Two sets of correction factors are then determined based on the estimates of the downlink and uplink channel responses. A calibrated downlink channel is formed by using a first set of correction factors for the downlink channel, and a calibrated uplink channel is formed by using a second set of correction factors for the uplink channel. The first and second sets of correction factors may be determined using a matrix-ratio computation or a minimum mean square error (MMSE) computation. The calibration may be performed in real-time based on over-the-air transmission.
摘要翻译：校准下行链路和上行链路信道以考虑接入点和用户终端处的发射和接收链的频率响应的差异的技术。在一个实施例中，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。然后基于下行链路和上行链路信道响应的估计来确定两组校正因子。通过使用用于下行链路信道的第一组校正因子形成校准的下行链路信道，并且通过使用用于上行链路信道的第二组校正因子形成校准的上行链路信道。可以使用矩阵比计算或最小均方误差（MMSE）计算来确定第一和第二组校正因子。校准可以基于空中传输实时执行。

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