公开(公告)号：US20070268181A1

公开(公告)日：2007-11-22

申请号：US11750220

申请日：2007-05-17

申请人： Steven Howard ,  John Ketchum ,  Mark Wallace ,  J. Walton

发明人： Steven Howard ,  John Ketchum ,  Mark Wallace ,  J. Walton

IPC分类号： H01Q3/00

CPC分类号： H01Q21/00 ,  H04B7/0404 ,  H04B7/0417 ,  H04B7/0634 ,  H04B7/066 ,  H04L1/0675

摘要： Techniques for efficiently deriving a transmit steering matrix and sending feedback for this matrix are described. A receiver determines a set of parameters defining a transmit steering matrix to be used for transmission from a transmitter to the receiver. The receiver may derive the transmit steering matrix based on a set of transformation matrices, which may be used for multiple iterations of Jacobi rotation to zero out off-diagonal elements of a channel matrix. The receiver may then determine the set of parameters based on the transformation matrices. The set of parameters may comprise at least one angle, at least one value, at least one index, etc., for each transformation matrix. The receiver sends the set of parameters defining the transmit steering matrix (instead of elements of the transmit steering matrix) to the transmitter for use by the transmitter to derive the transmit steering matrix.

摘要翻译： 描述了用于有效地导出发射导向矩阵并发送该矩阵的反馈的技术。 接收机确定定义要用于从发射机到接收机的传输的发射导引矩阵的一组参数。 接收机可以基于一组变换矩阵来导出发射导向矩阵，该组矩阵可用于Jacobi旋转的多次迭代以将信道矩阵的非对角线元素归零。 然后，接收机可以基于变换矩阵来确定参数集合。 对于每个变换矩阵，该组参数可以包括至少一个角度，至少一个值，至少一个索引等。 接收机将定义发射导向矩阵（而不是发射导向矩阵的元素）的参数集合发送到发射机以供发射机使用以导出发射导向矩阵。

公开(公告)号：US20070242768A1

公开(公告)日：2007-10-18

申请号：US11736091

申请日：2007-04-17

申请人： Mark Wallace ,  Peter Monsen

发明人： Mark Wallace ,  Peter Monsen

IPC分类号： H04K1/10

CPC分类号： H04L1/20 ,  H04L25/0242 ,  H04L25/03305 ,  H04L27/2613 ,  H04L27/2647 ,  H04L2025/03414 ,  H04L2025/03426

摘要： Techniques for deriving and using noise estimate for data reception in a wireless communication system are described. A noise estimate may be derived for each packet received in a data transmission. Data detection may then be performed for each packet using the noise estimate for that packet. For noise estimation, a first sample sequence and a second sample sequence may be obtained from each receiver used for data reception. A phase offset between the first and second sample sequences may be determined and applied to the first sample sequence for each receiver to obtain a third sample sequence for that receiver. A noise estimate may then be derived based on the power of the differences between the second and third sample sequences for the at least one receiver.

摘要翻译： 描述了在无线通信系统中导出和使用数据接收的噪声估计的技术。 可以为在数据传输中接收的每个分组导出噪声估计。 然后可以使用该分组的噪声估计对每个分组执行数据检测。 对于噪声估计，可以从用于数据接收的每个接收机获得第一采样序列和第二采样序列。 可以确定第一和第二采样序列之间的相位偏移并将其应用于每个接收机的第一采样序列，以获得该接收机的第三采样序列。 然后可以基于对于至少一个接收器的第二和第三采样序列之间的差的功率来导出噪声估计。

公开(公告)号：US20070183370A1

公开(公告)日：2007-08-09

申请号：US11609493

申请日：2006-12-12

申请人： Mark Wallace ,  Jay Walton

发明人： Mark Wallace ,  Jay Walton

IPC分类号： H04Q7/00

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. In another aspect, a preamble is generated with a longer spreading sequence and sent with each packet transmission.

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站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。 在另一方面，产生具有较长扩展序列的前同步码并且随每个分组传输一起发送。

公开(公告)号：US07164649B2

公开(公告)日：2007-01-16

申请号：US10001178

申请日：2001-11-02

申请人： Jay R. Walton ,  John W. Ketchum ,  Steven J. Howard ,  Mark Wallace

发明人： Jay R. Walton ,  John W. Ketchum ,  Steven J. Howard ,  Mark Wallace

IPC分类号： H04J11/00 ,  H04L1/00

CPC分类号： H04L1/0015 ,  H04L1/0002 ,  H04L1/0003 ,  H04L1/0009 ,  H04L1/0025 ,  H04L1/0026 ,  Y02D50/10

摘要： Techniques to adaptively control the rate of a data transmission in a wireless (e.g., OFDM) communication system. In an aspect, various types of metrics may be derived and used to select the proper rate for the data transmission. Some types of metrics relate to different characteristics of the communication channel, such as SNR, frequency selectivity, time selectivity, and so on. One type of metric relates to the performance of the data transmission. In another aspect, the various types of metrics may be used in different manners to adaptively control the rate. Some metrics may be used for open-loop control of the rate, other metrics may be used for closed-loop control, and some may be used for both. For example, the channel metrics may be used to determine or select the rate, and the performance metrics may be used to determine whether or not to adjust the rate.

摘要翻译： 技术来自适应地控制无线（例如，OFDM）通信系统中的数据传输速率。 在一方面，可以导出各种类型的度量，并且用于选择数据传输的适当速率。 一些类型的度量涉及通信信道的不同特性，例如SNR，频率选择性，时间选择性等。 一种类型的度量涉及数据传输的性能。 在另一方面，可以以不同的方式使用各种类型的度量来自适应地控制速率。 某些度量可用于速率的开环控制，其他度量也可用于闭环控制，一些可用于两者。 例如，可以使用信道度量来确定或选择速率，并且可以使用性能度量来确定是否调整速率。

公开(公告)号：US20060285531A1

公开(公告)日：2006-12-21

申请号：US11158586

申请日：2005-06-21

申请人： Steven Howard ,  John Ketchum ,  Mark Wallace ,  Peter Monsen ,  Jay Walton

发明人： Steven Howard ,  John Ketchum ,  Mark Wallace ,  Peter Monsen ,  Jay Walton

IPC分类号： H04J1/00 ,  H04L1/02

CPC分类号： H04B7/0854 ,  H04B7/0413 ,  H04L25/0246 ,  H04L25/0248 ,  H04L2025/03426 ,  H04L2025/03605 ,  H04L2025/03611

摘要： Techniques to efficiently derive a spatial filter matrix are described. In a first scheme, a Hermitian matrix is iteratively derived based on a channel response matrix, and a matrix inversion is indirectly calculated by deriving the Hermitian matrix iteratively. The spatial filter matrix is derived based on the Hermitian matrix and the channel response matrix. In a second scheme, multiple rotations are performed to iteratively obtain first and second matrices for a pseudo-inverse matrix of the channel response matrix. The spatial filter matrix is derived based on the first and second matrices. In a third scheme, a matrix is formed based on the channel response matrix and decomposed to obtain a unitary matrix and a diagonal matrix. The spatial filter matrix is derived based on the unitary matrix, the diagonal matrix, and the channel response matrix.

摘要翻译： 描述了有效地导出空间滤波器矩阵的技术。 在第一种方案中，基于信道响应矩阵迭代地导出Hermitian矩阵，并且通过迭代地导出Hermitian矩阵来间接计算矩阵求逆。 基于Hermitian矩阵和信道响应矩阵导出空间滤波矩阵。 在第二方案中，执行多次旋转以迭代地获得用于信道响应矩阵的伪逆矩阵的第一和第二矩阵。 基于第一和第二矩阵导出空间滤波器矩阵。 在第三方案中，基于信道响应矩阵形成矩阵并分解以获得酉矩阵和对角矩阵。 基于单一矩阵，对角矩阵和信道响应矩阵导出空间滤波器矩阵。

公开(公告)号：US20060262750A1

公开(公告)日：2006-11-23

申请号：US11417946

申请日：2006-05-03

申请人： Jay Walton ,  Mark Wallace ,  Jack Holtzman ,  Franklin Antonio

发明人： Jay Walton ,  Mark Wallace ,  Jack Holtzman ,  Franklin Antonio

IPC分类号： H04Q7/00

CPC分类号： H04W52/343 ,  H04W16/04 ,  H04W72/06

摘要： Techniques to partition and allocate the available system resources among cells in a communication system, and to allocate the resources in each cell to terminals for data transmission on the uplink. In one aspect, adaptive reuse schemes are provided wherein the available system resources may be dynamically and/or adaptively partitioned and allocated to the cells based on a number of factors such as the observed interference levels, loading conditions, system requirements, and so on. A reuse plan is initially defined and may be redefined to reflect changes in the system. In another aspect, the system resources may be partitioned such that each cell is allocated a set of channels having different performance levels. In yet another aspect, terminals in each cell are scheduled for data transmission (e.g., based on their priority or load requirements) and assigned channels based on their tolerance to interference and the channels' performance.

公开(公告)号：US20060105761A1

公开(公告)日：2006-05-18

申请号：US11301790

申请日：2005-12-12

申请人： Jay Walton ,  Mark Wallace ,  Steven Howard

发明人： Jay Walton ,  Mark Wallace ,  Steven Howard

IPC分类号： H04Q7/20

CPC分类号： H04W72/121 ,  H04B7/0417 ,  H04B7/0626 ,  H04B7/0697 ,  H04B7/0891 ,  H04W72/1205

摘要： Techniques to schedule uplink data transmission for a number of terminals in a wireless communication system. In one method, a number of sets of terminals are formed for possible data transmission, with each set including a unique combination of terminals and corresponds to a hypothesis to be evaluated. The performance of each hypothesis is evaluated (e.g., based on channel response estimates for each terminal) and one of the evaluated hypotheses is selected based on the performance. The terminals in the selected hypothesis are scheduled for data transmission. A successive cancellation receiver processing scheme may be used to process the signals transmitted by the scheduled terminals. In this case, one or more orderings of the terminals in each set may be formed, with each terminal ordering corresponding to a sub-hypothesis to be evaluated. The performance of each sub-hypothesis is then evaluated and one of the sub-hypotheses is selected.

公开(公告)号：US20060104381A1

公开(公告)日：2006-05-18

申请号：US11184601

申请日：2005-07-18

申请人： Murali Menon ,  John Ketchum ,  Mark Wallace ,  Jay Walton ,  Steven Howard

发明人： Murali Menon ,  John Ketchum ,  Mark Wallace ,  Jay Walton ,  Steven Howard

IPC分类号： H04B7/02 ,  H04K1/10

CPC分类号： H04B7/0417 ,  H01Q3/26 ,  H04B7/043 ,  H04B7/0617 ,  H04B7/0634 ,  H04L5/0025 ,  H04L5/0044 ,  H04L5/0053 ,  H04L5/006 ,  H04L5/0085 ,  H04L5/0096 ,  H04L25/0204 ,  H04L25/0246 ,  H04L25/0248 ,  H04L25/03343 ,  H04L2025/03414 ,  H04L2025/03426 ,  H04L2025/03802 ,  H04W52/42

摘要： Techniques to perform beam-steering and beam-forming to transmit data on a single eigenmode in a wideband multiple-input channel. In one method, a steering vector is obtained for each of a number of subbands. Depending on how the steering vectors are defined, beam-steering or beam-forming can be achieved for each subband. The total transmit power is allocated to the subbands based on a particular power allocation scheme (e.g., full channel inversion, selective channel inversion, water-filling, or uniform). A scaling value is then obtained for each subband based on its allocated transmit power. Data to be transmitted is coded and modulated to provide modulation symbols. The modulation symbols to be transmitted on each subband are scaled with the subband's scaling value and further preconditioned with the subband's steering vector. A stream of preconditioned symbols is then formed for each transmit antenna.

摘要翻译： 执行波束转向和波束成形以在宽带多输入通道中的单个本征模上传输数据的技术。 在一种方法中，为多个子带中的每一个获得导向矢量。 取决于如何定义导向矢量，可以为每个子带实现波束转向或波束形成。 基于特定功率分配方案（例如，全信道反转，选择性信道反转，充水或均匀）将总发射功率分配给子带。 然后根据其分配的发射功率，为每个子带获得缩放值。 要发送的数据被编码和调制以提供调制符号。 要在每个子带上发送的调制符号用子带的缩放值进行缩放，并进一步用子带的导向矢量进行预处理。 然后为每个发射天线形成预处理符号流。

公开(公告)号：US20060093067A1

公开(公告)日：2006-05-04

申请号：US11298639

申请日：2005-12-08

申请人： Ahmad Jalali ,  Jay Walton ,  Mark Wallace

发明人： Ahmad Jalali ,  Jay Walton ,  Mark Wallace

IPC分类号： H04B7/06 ,  H04K1/10

CPC分类号： H04L5/023

摘要： Transmitter and receiver units for use in an OFDM communications system and configurable to support multiple types of services. The transmitter unit includes one or more encoders, a symbol mapping element, and a modulator. Each encoder receives and codes a respective channel data stream to generate a corresponding coded data stream. The symbol mapping element receives and maps data from the coded data streams to generate modulation symbol vectors, with each modulation symbol vector including a set of data values used to modulate a set of tones to generate an OFDM symbol. The modulator modulates the modulation symbol vectors to provide a modulated signal suitable for transmission. The data from each coded data stream is mapped to a respective set of one or more “circuits”. Each circuit can be defined to include a number of tones from a number of OFDM symbols, a number of tones from a single OFDM symbol, all tones from one or more OFDM symbols, or some other combination of tones. The circuits can have equal size or different sizes. Different circuits can be used for full rate data (e.g., active speech) and low rate data (e.g., silence periods).

公开(公告)号：US20060050770A1

公开(公告)日：2006-03-09

申请号：US11042126

申请日：2005-01-24

申请人： Mark Wallace ,  Irina Medvedev ,  Jay Walton

发明人： Mark Wallace ,  Irina Medvedev ,  Jay Walton

IPC分类号： H04L1/02 ,  H04B1/707

CPC分类号： H04L25/0242 ,  H04B7/0669 ,  H04B7/068 ,  H04B7/0854 ,  H04L1/0606 ,  H04L1/0618 ,  H04L5/0023 ,  H04L25/0204 ,  H04L25/0224 ,  H04L25/0256 ,  H04L27/2613 ,  H04L27/2626 ,  H04L27/2647 ,  H04L2025/03426

摘要： A receiving entity obtains received symbols for a data transmission having at least one data symbol stream sent with space-time transmit diversity (STTD). The receiving entity derives an overall channel response matrix in accordance with the STTD encoding scheme used for the data transmission, derives a spatial filter matrix based on the overall channel response matrix, and performs spatial matched filtering on a vector of received symbols for each 2-symbol interval to obtain a vector of detected symbols for the 2-symbol interval. The receiving entity may perform post-processing (e.g., conjugation) on the detected symbols if needed. Alternatively, the receiving entity derives a spatial filter matrix based on an effective channel response matrix, performs spatial matched filtering on the received symbols for each symbol period to obtain detected symbols for that symbol period, and combines multiple estimates obtained for each data symbol sent with STTD.

摘要翻译： 接收实体获得具有用空时传输分集（STTD）发送的至少一个数据符号流的数据传输的接收符号。 接收实体根据用于数据传输的STTD编码方案导出整体信道响应矩阵，基于整个信道响应矩阵导出空间滤波器矩阵，并且对每个2-信道的接收符号的向量执行空间匹配滤波， 符号间隔以获得用于2符号间隔的检测符号的向量。 如果需要，接收实体可以在检测到的符号上执行后处理（例如，共轭）。 或者，接收实体基于有效信道响应矩阵导出空间滤波器矩阵，对于每个符号周期对接收到的符号执行空间匹配滤波，以获得该符号周期的检测符号，并且将针对每个符号周期发送的每个数据符号获得的多个估计合并 STTD。