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。

公开(公告)号：US20080043778A1

公开(公告)日：2008-02-21

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： H04J3/06 ,  H04J3/00

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。

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。

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.

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。

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。

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。

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。

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。

公开(公告)号：US07899131B2

公开(公告)日：2011-03-01

申请号：US11870380

申请日：2007-10-10

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： H04L27/04 ,  H04B7/02

CPC分类号： H04L25/03866 ,  H04B7/043 ,  H04B7/0615 ,  H04B7/0669 ,  H04B7/0678 ,  H04B7/068 ,  H04B7/12 ,  H04L5/0007 ,  H04L25/0204 ,  H04L25/0224 ,  H04W52/42

摘要： An access point in a multi-antenna system broadcasts data using spatial spreading to randomize an “effective” channel observed by each user terminal for each block of data symbols broadcast by the access point. At the access point, data is coded, interleaved, and modulated to obtain ND data symbol blocks to be broadcast in NM transmission spans, where ND≧1 and NM>1. The ND data symbol blocks are partitioned into NM data symbol subblocks, one subblock for each transmission span. A steering matrix is selected (e.g., in a deterministic or pseudo-random manner from among a set of L steering matrices) for each subblock. Each data symbol subblock is spatially processed with the steering matrix selected for that subblock to obtain transmit symbols, which are further processed and broadcast via NT transmit antennas and in one transmission span to user terminals within a broadcast coverage area.

摘要翻译： 多天线系统中的接入点使用空间扩展广播数据，以随机化由接入点广播的每个数据符号块由每个用户终端观察到的“有效”信道。 在接入点，对数据进行编码，交织和调制，以获得ND数据符号块，在ND传输范围内广播，其中ND≥1，NM> 1。 ND数据符号块被划分为NM数据符号子块，每个传输跨度的一个子块。 对于每个子块，选择导向矩阵（例如，从一组L个导引矩阵中以确定性或伪随机方式）。 利用为该子块选择的导引矩阵来对每个数据符号子块进行空间处理，以获得进一步的处理并经由NT个发射天线广播的传输符号，并在一个传输范围内广播到广播覆盖区域内的用户终端。