公开(公告)号：US20060063494A1

公开(公告)日：2006-03-23

申请号：US11075005

申请日：2005-03-07

申请人： Xiangdon Zhang ,  Jay Walton

发明人： Xiangdon Zhang ,  Jay Walton

IPC分类号： H04B1/44 ,  H04B1/38

CPC分类号： H04B1/18 ,  H04B1/48 ,  H04B7/04

摘要： A multi-antenna station has multiple remote front-ends coupled to multiple antennas. Each remote front-end includes a power amplifier (PA), a low noise amplifier (LNA), and first and second coupling units. On the transmit path, a first RF signal is received via a first port, routed by the first coupling unit to the power amplifier, amplified to obtain the desired output power level, and routed by the second coupling unit to a second port for transmission via the antenna. On the receive path, a second RF signal is received via the second port, routed by the second coupling unit to the LNA, amplified to obtain a higher signal level, and routed by the first coupling unit to the first port for transmission to the transceiver.

公开(公告)号：US20080056305A1

公开(公告)日：2008-03-06

申请号：US11751471

申请日：2007-05-21

申请人： Irina Medvedev ,  Jay Walton ,  Mark Wallace ,  Steven Howard

发明人： Irina Medvedev ,  Jay Walton ,  Mark Wallace ,  Steven Howard

IPC分类号： H04B3/10

CPC分类号： H04L27/0014 ,  H04L1/0045 ,  H04L5/0023 ,  H04L5/0048 ,  H04L25/061 ,  H04L27/261 ,  H04L27/2657 ,  H04L27/2662 ,  H04L2027/0053 ,  H04L2027/0067 ,  H04L2027/0087

摘要： Techniques for performing phase correction for wireless communication are described. Received pilot symbols and received data symbols may be obtained from an orthogonal frequency division multiplexing (OFDM) and/or multiple-input multiple-output (MIMO) transmission. First phase information is obtained based upon the received pilot symbols. Second phase information is obtained based upon the received data symbols. The phase of the received data symbols is corrected based upon the first and second phase information (directly and/or indirectly). For example, the phase of the received data symbols may be corrected based upon the first phase information, detection may be performed on the phase corrected data symbols to obtain estimated data symbols, the second phase information may be obtained based upon the estimated data symbols, and the phase of the estimated data symbols may be corrected based upon the second phase information. The phase correction may also be performed in other manners.

摘要翻译： 描述用于执行无线通信的相位校正的技术。 可以从正交频分复用（OFDM）和/或多输入多输出（MIMO）传输中获得接收到的导频符号和接收的数据符号。 基于接收到的导频符号获得第一相位信息。 基于接收到的数据符号获得第二相位信息。 基于第一和第二相位信息（直接和/或间接地）校正接收到的数据符号的相位。 例如，可以基于第一相位信息来校正接收到的数据符号的相位，可以对相位校正数据符号执行检测以获得估计的数据符号，可以基于估计的数据符号获得第二相位信息， 并且可以基于第二相位信息来校正估计数据符号的相位。 相位校正也可以以其他方式进行。

公开(公告)号：US20080013638A1

公开(公告)日：2008-01-17

申请号：US11766362

申请日：2007-06-21

申请人： Jay Walton ,  Mark Wallace ,  Steven Howard

发明人： Jay Walton ,  Mark Wallace ,  Steven Howard

IPC分类号： H04L27/28

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：US20070162827A1

公开(公告)日：2007-07-12

申请号：US11349367

申请日：2006-02-06

申请人： Jay Walton ,  Mark Wallace ,  Steven Howard

发明人： Jay Walton ,  Mark Wallace ,  Steven Howard

IPC分类号： H03M13/00

CPC分类号： H04L1/06 ,  H04L1/0631 ,  H04L25/03242 ,  H04L25/03292

摘要： Techniques for performing sphere detection to recover data symbols sent in a MIMO transmission are described. In an aspect, sphere detection is performed for data symbols generated with at least two modulation schemes. In another aspect, sphere detection is performed for the data symbols in an order determined based on at least one attribute of the data symbols, which may be error probabilities, modulation schemes, and/or link margins for the data symbols. In yet another aspect, rates for multiple data streams detected with sphere detection are selected based on channel state information. Signal qualities of the data streams may be estimated based on the channel state information, e.g., (1) an upper triangular matrix used for sphere detection and/or (2) an assumption that interference from data streams already detected is canceled. The rates for the data streams may be selected based on the estimated signal qualities.

摘要翻译： 描述了用于执行球体检测以恢复在MIMO传输中发送的数据符号的技术。 在一个方面，对用至少两个调制方案产生的数据符号执行球体检测。 在另一方面，以数据符号的至少一个属性确定的顺序对数据符号执行球体检测，数据符号可以是数据符号的错误概率，调制方案和/或链接余量。 在另一方面，基于信道状态信息选择用球检测检测的多个数据流的速率。 可以基于信道状态信息来估计数据流的信号质量，例如（1）用于球体检测的上三角矩阵和/或（2）已经检测到的来自数据流的干扰被消除的假设。 可以基于估计的信号质量来选择数据流的速率。

公开(公告)号：US20060106902A1

公开(公告)日：2006-05-18

申请号：US11096839

申请日：2005-03-31

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

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

IPC分类号： G06F15/00

CPC分类号： G06F17/16 ,  H04B7/0413 ,  H04B7/0617 ,  H04L25/0208 ,  H04L25/0248 ,  H04L27/2647

摘要： For eigenvalue decomposition, a first set of at least one variable is derived based on a first matrix being decomposed and using Coordinate Rotational Digital Computer (CORDIC) computation. A second set of at least one variable is derived based on the first matrix and using a look-up table. A second matrix of eigenvectors of the first matrix is then derived based on the first and second variable sets. To derive the first variable set, CORDIC computation is performed on an element of the first matrix to determine the magnitude and phase of this element, and CORDIC computation is performed on the phase to determine the sine and cosine of this element. To derive the second variable set, intermediate quantities are derived based on the first matrix and used to access the look-up table.

摘要翻译： 对于特征值分解，基于正在分解的第一矩阵并使用坐标旋转数字计算机（CORDIC）计算来导出至少一个变量的第一组。 基于第一矩阵并使用查找表导出第二组至少一个变量。 然后基于第一和第二变量集导出第一矩阵的特征向量的第二矩阵。 为了导出第一变量集，对第一矩阵的元素执行CORDIC计算，以确定该元素的幅度和相位，并且在相位上执行CORDIC计算以确定该元素的正弦和余弦。 为了导出第二变量集，基于第一矩阵导出中间量并用于访问查找表。

公开(公告)号：US20050250452A1

公开(公告)日：2005-11-10

申请号：US11047917

申请日：2005-01-31

申请人： Jay Walton ,  Franklin Antonio ,  Mark Wallace ,  Sriram Narayan

发明人： Jay Walton ,  Franklin Antonio ,  Mark Wallace ,  Sriram Narayan

IPC分类号： H04J99/00 ,  H04B1/16 ,  H04B1/00

CPC分类号： H04W52/029 ,  H04W52/0274 ,  Y02D70/00

摘要： A power-efficient wireless device is equipped with multiple (N) antennas. Each antenna is associated with a transmitter unit and a receiver unit. The wireless device also has processing units used to perform various digital processing tasks. The transmitter units, receiver units, and processing units may be selectively enabled or disabled. In an idle state, the wireless device may enable only a subset (e.g., one) of the N receiver units and one or few processing units for signal detection and acquisition. For active communication, the wireless device may enable Ntx transmitter units for data transmission and/or Nrx receiver units for data reception, where 1≧Ntx≧N and 1≧Nrx≧N. The enabled processing units may also be clocked at a lower frequency whenever data is transmitted or received at a data rate lower than the highest data rate. The wireless device may go to sleep whenever possible to conserve power.

摘要翻译： 功率高效的无线设备配备有多（N）个天线。 每个天线与发射机单元和接收机单元相关联。 无线设备还具有用于执行各种数字处理任务的处理单元。 可以选择性地启用或禁用发射机单元，接收机单元和处理单元。 在空闲状态下，无线设备可以仅使得N个接收机单元中的子集（例如，一个）和用于信号检测和获取的一个或几个处理单元。 对于主动通信，无线设备可以使用用于数据传输的N x x> transmitter transmitter transmitter transmitter transmitter and and or or or or or or x x x x x x x x x x x x x x x x x x x x x x x > = N和1> = N = N。 每当以低于最高数据速率的数据速率发送或接收数据时，启用的处理单元也可以以更低的频率被计时。 无线设备可能会尽可能地睡眠以节省电力。

公开(公告)号：US20050192037A1

公开(公告)日：2005-09-01

申请号：US11044539

申请日：2005-01-26

申请人： Sanjiv Nanda ,  Jay Walton

发明人： Sanjiv Nanda ,  Jay Walton

IPC分类号： H04B7/00 ,  H04L12/28 ,  H04L12/56

CPC分类号： H04W74/04 ,  H04W72/1231 ,  H04W72/1278 ,  H04W84/18

摘要： An ad hoc network with distributed hierarchical scheduling is disclosed. In one aspect, stations in a network mesh detect interfering neighbor stations and form interference lists. Stations transmit their interference lists. Scheduling stations schedule allocations for child stations in response to interference lists, received remote allocations, or a combination thereof. Coordination messages are transmitted including frame structure, allocations, and interference lists, among others. In another aspect, an ad hoc mesh network may be organized into a tree topology. In an example wireless backhaul network, this matches traffic flow. Distributed, hierarchical scheduling is provided where parents schedule communication with children while respecting already scheduled transmissions to/from interferers and to/from interferers of their respective children. Procedures to construct interference constraints for distributed, hierarchical scheduling are described, resulting in efficient scheduling and reuse in an ad hoc wireless network, without centralized scheduling. Various other aspects are also disclosed.

摘要翻译： 公开了一种具有分布式分层调度的自组织网络。 在一个方面，网络网络中的站检测干扰相邻站并形成干扰列表。 车站发送干扰列表。 调度站响应于干扰列表，接收的远程分配或其组合来调度子站的分配。 发送协调消息，包括帧结构，分配和干扰列表等。 在另一方面，可以将自组织网状网络组织成树形拓扑。 在无线回程网络的示例中，这匹配了流量。 提供了分布式的分层调度，其中父母调度与孩子的通信，同时尊重已经调度的传输到/来自干扰源和/或来自其相应子项的干扰。 描述了为分布式分层调度构建干扰约束的过程，从而在ad hoc无线网络中进行有效的调度和重用，而无需集中调度。 还公开了各种其它方面。

公开(公告)号：US20050157811A1

公开(公告)日：2005-07-21

申请号：US11081260

申请日：2005-03-15

申请人： Bjorn Bjerke ,  John Ketchum ,  Jay Walton

发明人： Bjorn Bjerke ,  John Ketchum ,  Jay Walton

IPC分类号： H04J99/00 ,  H04L1/00 ,  H04L1/06 ,  H04L27/26 ,  H04L27/04

CPC分类号： H04L1/005 ,  H04B7/0413 ,  H04B7/0854 ,  H04L1/0003 ,  H04L1/0009 ,  H04L1/0059 ,  H04L1/0066 ,  H04L1/0071 ,  H04L1/06 ,  H04L5/0023 ,  H04L25/03171 ,  H04L25/03305 ,  H04L25/03891 ,  H04L25/067 ,  H04L27/2647

摘要： Techniques to iteratively detect and decode data transmitted in a wireless (e.g., MIMO-OFDM) communication system. The iterative detection and decoding is performed by iteratively passing soft (multi-bit) “a priori” information between a detector and a decoder. The detector receives modulation symbols, performs a detection function that is complementary to the symbol mapping performed at the transmitter, and provides soft-decision symbols for transmitted coded bits. “Extrinsic information” in the soft-decision symbols is then decoded by the decoder to provide its extrinsic information, which comprises the a priori information used by the detector in the detection process. The detection and decoding may be iterated a number of times. The soft-decision symbols and the a priori information may be represented using log-likelihood ratios (LLRs). Techniques are provided to reduce the computational complexity associated with deriving the LLRs, including interference nulling to isolate each transmitted signal and “dual-maxima” approximation.

摘要翻译： 用于迭代地检测和解码在无线（例如，MIMO-OFDM）通信系统中发送的数据的技术。 迭代检测和解码通过在检测器和解码器之间迭代地传递软（多位）“先验”信息来执行。 检测器接收调制符号，执行与在发射机处执行的符号映射互补的检测功能，并为发送的编码比特提供软判决符号。 软判决符号中的“外在信息”然后由解码器解码以提供其外在信息，其包括检测器在检测过程中使用的先验信息。 可以重复检测和解码多次。 可以使用对数似然比（LLR）来表示软判决符号和先验信息。 提供技术以减少与导出LLR相关联的计算复杂度，包括干扰归零以隔离每个发射信号和“双最大值”近似。

公开(公告)号：US20050135284A1

公开(公告)日：2005-06-23

申请号：US10964321

申请日：2004-10-13

申请人： Sanjiv Nanda ,  Arnaud Meylan ,  Jay Walton

发明人： Sanjiv Nanda ,  Arnaud Meylan ,  Jay Walton

IPC分类号： H04B7/005 ,  H04L12/56 ,  H04L29/06 ,  H04W52/38 ,  H04L12/403 ,  H04L5/14 ,  H04L12/42

CPC分类号： H04L29/06068 ,  H04L1/0025 ,  H04L1/0073 ,  H04L1/0078 ,  H04L1/0618 ,  H04L1/1621 ,  H04L1/1671 ,  H04L12/403 ,  H04L12/4633 ,  H04L29/06 ,  H04L69/08 ,  H04L69/24 ,  H04W28/04 ,  H04W28/06 ,  H04W48/08 ,  H04W52/383 ,  H04W74/06

摘要： Embodiments disclosed herein for MAC processing for efficient use of high throughput systems and that may be backward compatible with various types of legacy systems. In one aspect, a data transmission structure comprises a consolidated poll and one or more frames transmitted in accordance with the consolidated poll. In another aspect, a Time Division Duplexing (TDD) data transmission structure comprises a pilot, a consolidated poll, and zero or more access point to remote station frames in accordance with the consolidated poll. In one aspect, frames are transmitted sequentially with no or substantially reduced interframe spacing. In another aspect, a guard interframe spacing may be introduced between frames transmitted from different sources, or with substantially different power levels. In another aspect, a single preamble is transmitted in association with one or more frames. In another aspect, a block acknowledgement is transmitted subsequent to the transmission of one or more sequential frames.

摘要翻译： 本文公开的用于MAC处理的实施例用于高吞吐量系统的有效使用并且可以向后兼容各种类型的传统系统。 一方面，数据传输结构包括合并轮询和根据综合民意调查发送的一个或多个帧。 另一方面，根据综合民意调查，时分双工（TDD）数据传输结构包括导频，综合轮询以及到远程站帧的零个或多个接入点。 在一个方面，帧以没有或基本上减小的帧间间隔顺序传送。 在另一方面，可以在从不同源发送的帧之间或具有基本上不同的功率电平的情况下引入保护帧间间隔。 在另一方面，与一个或多个帧相关联地发送单个前同步码。 在另一方面，在发送一个或多个顺序帧之后发送块确认。

公开(公告)号：US20050083888A1

公开(公告)日：2005-04-21

申请号：US10744373

申请日：2003-12-22

申请人： John Smee ,  Jay Walton ,  Durga Malladi ,  Serge Willenegger

发明人： John Smee ,  Jay Walton ,  Durga Malladi ,  Serge Willenegger

IPC分类号： H04W36/08 ,  H04Q7/00

CPC分类号： H04W36/30

摘要： A method and apparatus for performing handoff in a wireless communication system with multi-carrier modulation (MCM) for a forward link and CDMA for a reverse link. In one embodiment, a method of performing handoff on the forward link for a terminal is provided in which signal quality of pilots received by the terminal from a plurality of base stations in the system is determined. A particular base station for subsequent data transmission on the forward link to the terminal is selected based on the signal quality determined for the plurality of base stations. A request to be handed off to the particular base station is initiated if the particular base station is different than a currently selected base station.

摘要翻译： 一种用于在用于前向链路的多载波调制（MCM）和用于反向链路的CDMA的无线通信系统中执行切换的方法和装置。 在一个实施例中，提供了一种在终端的前向链路上执行切换的方法，其中终端从系统中的多个基站接收的导频的信号质量被确定。 基于为多个基站确定的信号质量来选择用于在到终端的前向链路上的后续数据传输的特定基站。 如果特定基站不同于当前选择的基站，则启动要切换到特定基站的请求。