公开(公告)号：US20060099915A1

公开(公告)日：2006-05-11

申请号：US11284285

申请日：2005-11-21

申请人： Rajiv Laroia ,  Junyi Li ,  Sundeep Rangan ,  Murari Srinivasan ,  Frank Lane ,  Prashanth Hande

发明人： Rajiv Laroia ,  Junyi Li ,  Sundeep Rangan ,  Murari Srinivasan ,  Frank Lane ,  Prashanth Hande

IPC分类号： H04B7/00

CPC分类号： H04B7/0604 ,  H01Q3/24 ,  H01Q3/2605 ,  H04B7/061 ,  H04B7/0691 ,  H04B7/0805 ,  H04L1/0026 ,  H04L5/0007 ,  H04L5/0023 ,  H04L5/0026 ,  H04L5/006 ,  H04W52/42

摘要： Transmit and/or receive diversity is achieved using multiple antennas. In some embodiments, a single transmitter chain within a wireless terminal is coupled over time to a plurality of transmit antennas. At any given time, a controllable switching module couples the single transmitter chain to one the plurality of transmit antennas. Over time, the switching module couples the output signals from the single transmitter chain to different transmit antennas. Switching decisions are based upon predetermined information, dwell information, and/or channel condition feedback information. Switching is performed on some dwell and/or channel estimation boundaries. In some OFDM embodiments, each of multiple transmitter chains is coupled respectively to a different transmit antenna. Information to be transmitted is mapped to a plurality of tones. Different subsets of tones are formed for and transmitted through different transmit chain/antenna sets simultaneously. The balance of tones allocated to the subsets for each antenna are changed as a function of predetermined information, dwell information, and/or channel condition feedback information.

公开(公告)号：US20050085197A1

公开(公告)日：2005-04-21

申请号：US10964885

申请日：2004-10-14

申请人： Rajiv Laroia ,  Junyi Li ,  Sundeep Rangan ,  Murari Srinivasan ,  Frank Lane ,  Prashanth Hande

发明人： Rajiv Laroia ,  Junyi Li ,  Sundeep Rangan ,  Murari Srinivasan ,  Frank Lane ,  Prashanth Hande

IPC分类号： H04B7/005 ,  H04B7/06 ,  H04B7/08 ,  H04L1/00 ,  H04W52/42 ,  H04B1/02 ,  H03C7/02 ,  H04B7/02 ,  H04B7/10 ,  H04L1/02

CPC分类号： H04B7/0604 ,  H01Q3/24 ,  H01Q3/2605 ,  H04B7/061 ,  H04B7/0691 ,  H04B7/0805 ,  H04L1/0026 ,  H04L5/0007 ,  H04L5/0023 ,  H04L5/0026 ,  H04L5/006 ,  H04W52/42

摘要： Transmit and/or receive diversity is achieved using multiple antennas. In some embodiments, a single transmitter chain within a wireless terminal is coupled over time to a plurality of transmit antennas. At any given time, a controllable switching module couples the single transmitter chain to one the plurality of transmit antennas. Over time, the switching module couples the output signals from the single transmitter chain to different transmit antennas. Switching decisions are based upon predetermined information, dwell information, and/or channel condition feedback information. Switching is performed on some dwell and/or channel estimation boundaries. In some OFDM embodiments, each of multiple transmitter chains is coupled respectively to a different transmit antenna. Information to be transmitted is mapped to a plurality of tones. Different subsets of tones are formed for and transmitted through different transmit chain/antenna sets simultaneously. The balance of tones allocated to the subsets for each antenna are changed as a function of predetermined information, dwell information, and/or channel condition feedback information.

摘要翻译： 使用多个天线实现发射和/或接收分集。 在一些实施例中，无线终端内的单个发射机链随时间耦合到多个发射天线。 在任何给定时间，可控开关模块将单个发射机链耦合到多个发射天线中的一个。 随着时间的推移，开关模块将来自单个发射机链的输出信号耦合到不同的发射天线。 切换决定基于预定信息，停留信息和/或信道条件反馈信息。 在一些驻留和/或信道估计边界上执行切换。 在一些OFDM实施例中，多个发射机链中的每一个分别耦合到不同的发射天线。 要发送的信息被映射到多个音调。 为不同的发射链/天线组同时形成和发送不同的音调子集。 分配给每个天线的子集的音调的平衡作为预定信息，停留信息和/或信道条件反馈信息的函数而改变。

公开(公告)号：US20070247365A1

公开(公告)日：2007-10-25

申请号：US11621955

申请日：2007-01-10

申请人： Rajiv Laroia ,  Sundeep Rangan ,  Arnab Das ,  Frank Lane ,  Junyi Li

发明人： Rajiv Laroia ,  Sundeep Rangan ,  Arnab Das ,  Frank Lane ,  Junyi Li

IPC分类号： G01S1/00

CPC分类号： H04W40/244 ,  H04J3/0602 ,  H04L5/0016 ,  H04L5/0035 ,  H04L5/0048 ,  H04L27/2601 ,  H04L27/261 ,  H04W8/005 ,  H04W16/14 ,  H04W28/04 ,  H04W28/18 ,  H04W36/16 ,  H04W36/24 ,  H04W40/24 ,  H04W48/08 ,  H04W48/16 ,  H04W48/20 ,  H04W52/0229 ,  H04W52/04 ,  H04W72/02 ,  H04W76/14 ,  H04W84/042 ,  H04W84/18 ,  H04W88/02 ,  H04W88/04 ,  H04W88/06 ,  H04W88/10 ,  Y02D70/1222 ,  Y02D70/1224 ,  Y02D70/1242 ,  Y02D70/1262 ,  Y02D70/142 ,  Y02D70/144 ,  Y02D70/146 ,  Y02D70/162 ,  Y02D70/164 ,  Y02D70/168 ,  Y02D70/22 ,  Y02D70/23

摘要： A portable wireless terminal generates and transmits a beacon signal. The beacon signal includes a sequence of beacon signal bursts, each beacon signal burst including one or more beacon symbols. A beacon symbol is transmitted using the air link resources of a beacon symbol transmission unit at a relatively high transmission power level with respect to user data symbols transmitted from the same wireless terminal, thus facilitating easy detection by other wireless terminals. The beacon symbols of the beacon signal occupy a small fraction of the total available air link resources. Beacon signals can, and sometimes do, convey wireless terminal identification information, via the location of the beacon symbols within the portion of the air link resource reserved for beacon symbol transmission units.

摘要翻译： 便携式无线终端生成并发送信标信号。 信标信号包括信标信号脉冲序列，每个信标信号脉冲串包括一个或多个信标符号。 相对于从同一无线终端发送的用户数据符号，以相对高的发送功率电平的信标符号发送单元的空中链路资源发送信标符号，便于其他无线终端的容易检测。 信标信号的信标符号占据总可用空中链路资源的一小部分。 信标信号可以并且有时可以通过为为信标符号传输单元预留的空中链路资源的部分内的信标符号的位置传送无线终端识别信息。

公开(公告)号：US20070201423A1

公开(公告)日：2007-08-30

申请号：US11621957

申请日：2007-01-10

申请人： Rajiv Laroia ,  Sundeep Rangan ,  Arnab Das ,  Frank Lane ,  Junyi Li

发明人： Rajiv Laroia ,  Sundeep Rangan ,  Arnab Das ,  Frank Lane ,  Junyi Li

IPC分类号： H04J3/00

CPC分类号： H04W40/244 ,  H04J3/0602 ,  H04L5/0016 ,  H04L5/0035 ,  H04L5/0048 ,  H04L27/2601 ,  H04L27/261 ,  H04W8/005 ,  H04W16/14 ,  H04W28/04 ,  H04W28/18 ,  H04W36/16 ,  H04W36/24 ,  H04W40/24 ,  H04W48/08 ,  H04W48/16 ,  H04W48/20 ,  H04W52/0229 ,  H04W52/04 ,  H04W72/02 ,  H04W76/14 ,  H04W84/042 ,  H04W84/18 ,  H04W88/02 ,  H04W88/04 ,  H04W88/06 ,  H04W88/10 ,  Y02D70/1222 ,  Y02D70/1224 ,  Y02D70/1242 ,  Y02D70/1262 ,  Y02D70/142 ,  Y02D70/144 ,  Y02D70/146 ,  Y02D70/162 ,  Y02D70/164 ,  Y02D70/168 ,  Y02D70/22 ,  Y02D70/23

摘要： Wireless terminal beacon signaling is used to achieve timing synchronization between two wireless terminals in a wireless communication system, e.g., in an ad hoc network lacking a centralized timing reference. An exemplary timing structure used by an individual wireless terminal includes a beacon transmission time interval, a beacon monitoring time interval and a silence time interval. A first wireless terminal monitoring for beacon signals from other wireless terminals, detects a beacon signal portion from a second wireless terminal and determines a timing adjustment as a function of the detected beacon signal portion. The first wireless terminal applies the determined timing adjustment, e.g., time shifting its timing structure, such that its beacon signal can be detected by the second wireless terminal. Implementation of the determined timing adjustment sets the timing structures of the two wireless terminals to have a fixed relationship thereby allowing for coordinated communications including a peer-to-peer communications session.

摘要翻译： 无线终端信标信令用于实现无线通信系统中的两个无线终端之间的定时同步，例如在缺乏集中定时参考的自组织网络中。 单个无线终端使用的示例性定时结构包括信标发送时间间隔，信标监视时间间隔和静默时间间隔。 监测来自其他无线终端的信标信号的第一无线终端从第二无线终端检测信标信号部分，并根据检测到的信标信号部分确定定时调整。 第一无线终端应用确定的定时调整，例如时移其定时结构，使得其信标信号可被第二无线终端检测。 确定的定时调整的实现将两个无线终端的定时结构设置为具有固定关系，从而允许包括对等通信会话的协调通信。

公开(公告)号：US07995527B2

公开(公告)日：2011-08-09

申请号：US12119774

申请日：2008-05-13

申请人： Junyi Li ,  Rajiv Laroia ,  Frank Lane

发明人： Junyi Li ,  Rajiv Laroia ,  Frank Lane

IPC分类号： H04W4/00 ,  H04W40/00

CPC分类号： H04W52/34 ,  H04B7/12 ,  H04L27/2662 ,  H04W52/343 ,  H04W52/42

摘要： Power control methods and apparatus for use in a sectorized cell of an OFDM communications system are described. Each sector of a cell uses the same frequencies and transmission times and is synchronized with the other sectors in the cell in terms of tone frequencies used at any given time and symbol transmission times. Tones are allocated to channels in each cell in the same manner so that each channel in a sector has a corresponding channel in another sector. Power differences between channels in different sectors are maintained to be within a pre-selected power difference. Different channels in a cell are assigned different power levels. Wireless terminals are assigned to channels based on channel feedback information. Wireless terminals with poor channel conditions are allocated to higher power channels than wireless terminals with good channel conditions. Lower power channels often include more tones per symbol time than high power channels.

摘要翻译： 描述了在OFDM通信系统的扇区化小区中使用的功率控制方法和装置。 单元的每个扇区使用相同的频率和传输时间，并且根据在任何给定时间和符号传输时间使用的音调频率与小区中的其他扇区同步。 以相同的方式将音调分配给每个小区中的信道，使得扇区中的每个信道在另一个扇区中具有相应的信道。 不同扇区中的信道之间的功率差被维持在预先选择的功率差之内。 单元中的不同通道被分配不同的功率电平。 基于信道反馈信息将无线终端分配给信道。 具有较差信道条件的无线终端分配给具有良好信道条件的无线终端的较高功率信道。 低功率通道通常每个符号时间包括比高功率通道更多的音调。

公开(公告)号：US20080291856A1

公开(公告)日：2008-11-27

申请号：US12119774

申请日：2008-05-13

申请人： Junyi Li ,  Rajiv Laroia ,  Frank Lane

发明人： Junyi Li ,  Rajiv Laroia ,  Frank Lane

IPC分类号： H04B7/212

CPC分类号： H04W52/34 ,  H04B7/12 ,  H04L27/2662 ,  H04W52/343 ,  H04W52/42

摘要： Power control methods and apparatus for use in a sectorized cell of an OFDM communications system are described. Each sector of a cell uses the same frequencies and transmission times and is synchronized with the other sectors in the cell in terms of tone frequencies used at any given time and symbol transmission times. Tones are allocated to channels in each cell in the same manner so that each channel in a sector has a corresponding channel in another sector. Power differences between channels in different sectors are maintained to be within a pre-selected power difference. Different channels in a cell are assigned different power levels. Wireless terminals are assigned to channels based on channel feedback information. Wireless terminals with poor channel conditions are allocated to higher power channels than wireless terminals with good channel conditions. Lower power channels often include more tones per symbol time than high power channels.

摘要翻译： 描述了在OFDM通信系统的扇区化小区中使用的功率控制方法和装置。 单元的每个扇区使用相同的频率和传输时间，并且根据在任何给定时间和符号传输时间使用的音调频率与小区中的其他扇区同步。 以相同的方式将音调分配给每个小区中的信道，使得扇区中的每个信道在另一个扇区中具有相应的信道。 不同扇区中的信道之间的功率差被维持在预先选择的功率差之内。 单元中的不同通道被分配不同的功率电平。 基于信道反馈信息将无线终端分配给信道。 具有较差信道条件的无线终端分配给具有良好信道条件的无线终端的较高功率信道。 低功率通道通常每个符号时间包括比高功率通道更多的音调。

公开(公告)号：US20070211680A1

公开(公告)日：2007-09-13

申请号：US11621986

申请日：2007-01-10

申请人： Rajiv Laroia ,  Frank Lane ,  Junyi Li ,  Tom Richardson

发明人： Rajiv Laroia ,  Frank Lane ,  Junyi Li ,  Tom Richardson

IPC分类号： H04Q7/24

CPC分类号： H04W40/244 ,  H04J3/0602 ,  H04L5/0016 ,  H04L5/0035 ,  H04L5/0048 ,  H04L27/2601 ,  H04L27/261 ,  H04W8/005 ,  H04W16/14 ,  H04W28/04 ,  H04W28/18 ,  H04W36/16 ,  H04W36/24 ,  H04W40/24 ,  H04W48/08 ,  H04W48/16 ,  H04W48/20 ,  H04W52/0229 ,  H04W52/04 ,  H04W72/02 ,  H04W76/14 ,  H04W84/042 ,  H04W84/18 ,  H04W88/02 ,  H04W88/04 ,  H04W88/06 ,  H04W88/10 ,  Y02D70/1222 ,  Y02D70/1224 ,  Y02D70/1242 ,  Y02D70/1262 ,  Y02D70/142 ,  Y02D70/144 ,  Y02D70/146 ,  Y02D70/162 ,  Y02D70/164 ,  Y02D70/168 ,  Y02D70/22 ,  Y02D70/23

摘要： Wireless devices, e.g., in a cognitive radio network, discover and use locally available usable spectrum for communication. Beacon signaling facilitates available spectrum discovery and spectrum usage coordination. A wireless terminal, which may have entered a new area and powered up, monitors to detect for the presence of beacon signals in a first communications band. The wireless terminal makes a decision as to whether or not to transmit based on the monitoring result. In addition, when beacon signals are detected, decoded information recovered by the wireless terminal from the received beacon signals is used in making the transmission decision. The decoded information includes, e.g., type information indicating that a second band is allowed to be used for peer-peer communications and/or identification information identifying at least one of a wireless communications device which transmitted the beacon signal and a current user of the wireless communications device which transmitted the beacon signal.

摘要翻译： 无线设备，例如在认知无线电网络中，发现并使用本地可用的可用频谱进行通信。 信标信号促进了可用的频谱发现和频谱使用协调。 可能进入新区域并加电的无线终端监视以检测第一通信频带中信标信号的存在。 无线终端基于监视结果判断是否发送。 此外，当检测到信标信号时，使用由接收的信标信号由无线终端恢复的解码信息进行发送决定。 解码信息包括例如指示第二频带被允许用于对等通信的类型信息和/或标识发送信标信号的无线通信设备和无线电的当前用户中的至少一个的识别信息 发送信标信号的通信装置。

公开(公告)号：US20070021121A1

公开(公告)日：2007-01-25

申请号：US11216770

申请日：2005-08-31

申请人： Frank Lane ,  Rajiv Laroia ,  Junyi Li

发明人： Frank Lane ,  Rajiv Laroia ,  Junyi Li

IPC分类号： H04Q7/20

CPC分类号： H04B7/01 ,  G01S5/0009 ,  G01S5/0284 ,  H04W56/0025 ,  H04W56/0035 ,  H04W56/006 ,  H04W92/10

摘要： A wireless terminal determines the position of a moving base station and determines timing and/or frequency corrections. A wireless terminal determines its relative position with respect to the base station and determines a timing adjustment correction. The wireless terminal applies the determined timing correction to control uplink signaling timing and achieve synchronization at the base station's receiver. The wireless terminal determines its relative velocity with respect to the moving base station and determines a Doppler shift adjustment which it adds to the uplink carrier frequency or to its baseband signal. Base station position is determined from the current time and stored information correlating the base station position with time, e.g., for a geo-synchronous satellite. Base station position information, e.g., a GPS derived base station position fix, is determined from downlink airlink broadcast information, e.g., for an aircraft base station. Wireless terminals may be mobile and include a GPS receiver for wireless terminal position determination.

摘要翻译： 无线终端确定移动基站的位置并确定定时和/或频率校正。 无线终端确定其相对于基站的相对位置并确定定时调整校正。 无线终端应用所确定的定时校正以控制上行链路信令定时，并在基站的接收机处实现同步。 无线终端确定其相对于移动基站的相对速度，并确定其添加到上行链路载波频率或其基带信号的多普勒频移调整。 基站位置是从当前时间确定的，并存储与基站位置和时间相关的信息，例如用于地理同步卫星。 基站位置信息，例如，GPS导出的基站位置定位，是从下行链路空中链路广播信息（例如飞机基站）确定的。 无线终端可以是移动的，并且包括用于无线终端位置确定的GPS接收器。

公开(公告)号：US20060205356A1

公开(公告)日：2006-09-14

申请号：US11249775

申请日：2005-10-13

申请人： Rajiv Laroia ,  Junyi Li ,  Frank Lane

发明人： Rajiv Laroia ,  Junyi Li ,  Frank Lane

IPC分类号： H04B7/00

CPC分类号： H04B7/088 ,  H04B7/0811 ,  H04B7/0848

摘要： Base stations transmit strip signals using strip signal segments and self supporting modulation scheme techniques facilitating rapid channel estimate. A strip segment occupies one OFDM symbol time interval and uses a set of downlink tones; some, e.g., half, of the tones are left unused facilitating SIR measurement. The strip segments are advantageously timed to correspond to uplink access intervals in which connected wireless terminals do not typically transmit uplink signals. Connected wireless terminals including: multiple antennas used in combination, an antenna duplex module, single RF receiver chain and single RF transmitter chain, switch antenna coefficient combinations based on strip signal segment timing. The wireless terminal determines an independent downlink channel quality measurement, e.g., SNR and/or SIR for each strip signal segment and for on-going non-strip signaling. The wireless terminal compares channel quality measurements and selects an antenna coefficient combination to be used during non-strip signaling intervals obtaining very good antenna gain.

摘要翻译： 基站使用带状信号段和自支持调制方案技术来传输带状信号，这有助于快速信道估计。 条带占用一个OFDM符号时间间隔并使用一组下行链路音调; 一些，例如一半的音调被置于未使用状态，便于SIR测量。 带状段有利地被定时以对应于其中连接的无线终端通常不发送上行链路信号的上行链路接入间隔。 连接的无线终端包括：组合使用多个天线，天线双工模块，单个射频接收机链和单个射频发射机链，基于条带信号段定时的开关天线系数组合。 无线终端确定独立的下行链路信道质量测量，例如每个条带信号段的SNR和/或SIR，以及用于正在进行的非条带信令。 无线终端比较信道质量测量并选择在非剥离信令间隔期间使用的天线系数组合，从而获得非常好的天线增益。

公开(公告)号：US20060083189A1

公开(公告)日：2006-04-20

申请号：US10965011

申请日：2004-10-14

申请人： Rajiv Laroia ,  Frank Lane ,  Junyi Li

发明人： Rajiv Laroia ,  Frank Lane ,  Junyi Li

IPC分类号： H04J11/00 ,  H04B7/204

CPC分类号： H04L5/0044 ,  H04L5/0048 ,  H04L5/0053

摘要： Methods and apparatus for using high power narrow signals, e.g., tones, for communicating transmitter information without putting the full transmission power available into the transmitted tone or tones are described. User data is transmitted in parallel with transmitter information in many embodiments with the user data being allocated more than 20% of the transmitter's maximum output power in many cases. Buy using an amount of power on the tones used to communicate transmitter information while simultaneously transmitting user data with more than 20% of the available transmission power, efficient bandwidth utilization is achieved while still ensuring a high probability that that the transmitter information signals will be received and detectable using simple energy detection techniques and without the need for timing synchronization with the transmitter to be achieved for success interpretation of the transmitter information.