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：US20060203856A1

公开(公告)日：2006-09-14

申请号：US11230300

申请日：2005-09-19

申请人： Rajiv Laroia ,  Hui Jin ,  Tom Richardson ,  Junyi Li

发明人： Rajiv Laroia ,  Hui Jin ,  Tom Richardson ,  Junyi Li

IPC分类号： H04J3/12

CPC分类号： H04W52/08 ,  H04L1/0025 ,  H04L1/0026 ,  H04L27/2608 ,  H04W28/22 ,  H04W52/04 ,  H04W72/0413

摘要： A wireless terminal includes an uplink rate option indicator in the same uplink channel segment with data, the rate option indicator providing transmission rate information about the data transmitted in the segment. The indicator value is represented by an energy pattern within the segment. Different energy patterns correspond to different indicator values. The number of indicator values is less than the number of possible uplink data rate options supported by the wireless terminal. A single indicator value represents different uplink data rate options, at different times, as a function of a received maximum data rate option and/or type of assignment message. The maximum data rate option and/or assignment message was transmitted by the same base station receiving the indicator value; therefore, there is no ambiguity between wireless terminal and base station as to the interpretation of the uplink data rate option indicator value with respect to an individual uplink segment.

摘要翻译： 无线终端包括与数据相同的上行链路信道段中的上行链路速率选项指示符，速率选项指示符提供关于在该段中发送的数据的传输速率信息。 指标值由段内的能量模式表示。 不同的能量模式对应于不同的指标值。 指标值的数量小于无线终端支持的可能的上行链路数据速率选项的数量。 单个指标值表示不同的上行链路数据速率选项，在不同的时间，作为接收到的最大数据速率选项和/或分配消息的类型的函数。 最大数据速率选项和/或分配消息由接收到指标值的同一基站发送; 因此，关于单个上行链路段的上行链路数据速率选项指示符值的解释，无线终端和基站之间没有歧义。

公开(公告)号：US07092353B2

公开(公告)日：2006-08-15

申请号：US10964965

申请日：2004-10-14

申请人： Rajiv Laroia ,  Charles Stanski ,  Junyi Li

发明人： Rajiv Laroia ,  Charles Stanski ,  Junyi Li

IPC分类号： H04J11/00 ,  H04J4/00 ,  H04Q7/00

CPC分类号： H04W48/10 ,  H04L5/0007 ,  H04L5/0039 ,  H04L5/0048 ,  H04L25/0226 ,  H04L27/2655 ,  H04W48/16

摘要： Transmitting signals, e.g., high power narrow band signals on a periodic basis to facilitate detection of a frequency band and/or carrier signal to be used for communication with a basestation are described. The detected frequency band may be a downlink frequency band. The uplink frequency band to be used can be determined from a know frequency relationship between the detected downlink carrier and a corresponding uplink carrier or by monitoring the detected downlink frequency band for information indicating the uplink frequency band/carrier to be used. Carrier search methods involving searching for the narrowband high power signals used to provide carrier information and/or to indicate the frequency band to be monitored are described. Power detection methods can be used to detect the high power signals avoiding the need for symbol timing synchronization and/or channel estimation with regard to detection of the signals used to locate the frequency band to be used.

摘要翻译： 描述了周期性地发送信号，例如高功率窄带信号，以便于检测用于与基站通信的频带和/或载波信号。 所检测的频带可以是下行链路频带。 可以从检测到的下行链路载波和对应的上行链路载波之间的已知频率关系来确定要使用的上行链路频带，或者通过监视检测到的下行链路频带来指示要使用的上行链路频带/载波的信息。 描述了涉及搜索用于提供载波信息的窄带高功率信号和/或指示要监视的频带的载波搜索方法。 功率检测方法可以用于检测高功率信号，从而避免了对用于定位要使用的频带的信号的检测的符号定时同步和/或信道估计的需要。

公开(公告)号：US07047009B2

公开(公告)日：2006-05-16

申请号：US10964945

申请日：2004-10-14

申请人： Rajiv Laroia ,  Junyi Li ,  Frank A. Lane

发明人： Rajiv Laroia ,  Junyi Li ,  Frank A. Lane

IPC分类号： H04Q7/20 ,  H04Q7/00

CPC分类号： H04W36/18 ,  H04W36/06

摘要： A mobile communications device initiates a handoff from its current base station (BS) sector network attachment point to a new BS sector. The mobile sends a handoff request over its current wireless link to the current BS sector, which forwards the request to the new BS sector, e.g., via a network link. The new BS sector processes the request assigning dedicated resources, e.g., an identifier and dedicated uplink segments. Information identifying the allocated resources is conveyed from the new BS sector via the current BS sector to the mobile. The mobile determines the time of the allocated dedicated segments based upon a received beacon signal from the new BS sector with known timing relationships to dedicated segments. The mobile breaks the original wireless link just prior to the time of the first assigned dedicated segment. The mobile communicates information on the assigned dedicated segments to perform registration operations, e.g., timing synchronization and power control, establishing a new wireless link.

摘要翻译： 移动通信设备发起从其当前基站（BS）扇区网络连接点到新的BS扇区的切换。 移动台通过其当前的无线链路向当前BS扇区发送切换请求，该BS扇区将该请求转发到新的BS扇区，例如经由网络链路。 新BS部门处理分配专用资源的请求，例如标识符和专用上行链路段。 识别分配的资源的信息从新的BS扇区通过当前BS扇区传送到移动台。 移动台基于来自新BS扇区的接收到的信标信号确定所分配的专用段的时间，具有与专用段的已知定时关系。 移动台在第一个分配的专用段之前就打破原始的无线链路。 移动台在分配的专用段上传送信息以执行注册操作，例如定时同步和功率控制，建立新的无线链路。

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：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.

公开(公告)号：US20060083159A1

公开(公告)日：2006-04-20

申请号：US11247963

申请日：2005-10-11

申请人： Rajiv Laroia ,  Junyi Li ,  Vladimir Parizhsky

发明人： Rajiv Laroia ,  Junyi Li ,  Vladimir Parizhsky

IPC分类号： H04J11/00

CPC分类号： H04L27/2601

摘要： More efficient utilization of available bandwidth is implemented in an OFDM wireless communication system. The partitions of bandwidth may be of different sizes and may be different from the original system design parameters. Basic system structure such as the number of tones used and the number of OFDM symbol times in a slot is maintained throughout the system. Bandwidth is varied by adjusting the inter-tone spacing or bandwidth associated with a single tone. As the inter-tone spacing is increased, the OFDM symbol transmission time is decreased following an inverse proportional relationship. A wireless communications device, during a first period of time transmits signals using a first uplink frequency band of a first number of uniformly distributed tones and during a second period of time transmits signals using a second uplink frequency band of a second number of uniformly distributed tones, the second number being the same as the first number, the second frequency band being wider than the first frequency band.

摘要翻译： 在OFDM无线通信系统中实现可用带宽的更有效利用。 带宽分区可能具有不同的大小，并且可能与原始系统设计参数不同。 在整个系统中保持基本系统结构，例如使用的音调数和时隙中的OFDM符号时间的数量。 通过调整与单个音调相关联的音调间距或带宽来改变带宽。 随着色间间隔的增加，OFDM符号传输时间按照反比例关系减小。 无线通信设备在第一时段期间使用第一数量均匀分布的音调的第一上行链路频带发送信号，并且在第二时段期间使用第二数量均匀分布的音调的第二上行链路频带来发送信号 第二个数字与第一个数字相同，第二个频带宽于第一个频带。

公开(公告)号：US07031292B2

公开(公告)日：2006-04-18

申请号：US10094596

申请日：2002-03-08

申请人： Rajiv Laroia ,  Junyi Li ,  Vladimir Parizhsky

发明人： Rajiv Laroia ,  Junyi Li ,  Vladimir Parizhsky

IPC分类号： H04B7/212

CPC分类号： H04B7/2643

摘要： Scheduling of regular signal transmissions, e.g., between a plurality of wireless terminals and a base station in a cellular network in a manner designed to reduce or minimize recurring periodic interference encountered by individual wireless terminals from transmission in neighboring cells is described. Signal transmissions of wireless terminals in each cell are scheduled on a group slot basis. A group slot comprises a number of time slots. Each wireless terminal serviced by a particular base station is assigned a time slot in a group slot used by the particular base station. A given wireless terminal is assigned different time slots in successive group slots as specified by a hopping function. Adjacent, base stations e.g., base stations of physically neighboring or overlapping cells, use distinct, i.e., different, hopping functions for the scheduling purpose thereby avoiding correlation of slots between overlapping or adjacent cells during consecutive group slots.

公开(公告)号：US07027429B2

公开(公告)日：2006-04-11

申请号：US09884581

申请日：2001-06-19

申请人： Rajiv Laroia ,  Junyi Li ,  Sundeep Rangan ,  Hemanth T. Sampath

发明人： Rajiv Laroia ,  Junyi Li ,  Sundeep Rangan ,  Hemanth T. Sampath

IPC分类号： H04J3/06

CPC分类号： H04L27/2663 ,  H04L27/2659 ,  H04L27/266 ,  H04L27/2665 ,  H04L27/2675

摘要： A method and apparatus for joint time and frequency synchronization for orthogonal frequency division multiplexing (OFDM) systems. A multitone pilot signal is sent in a designated OFDM symbol period. The receiver synchronizes to the pilot signal in a two-stage procedure. The first stage estimates the frequency offset coarsely with a frequency-domain correlation method and estimates the time offset with smoothed time-domain correlation. In a multipath channel, the smoothed time offset estimate is used to locate a cyclic prefix interval which captures the maximum total signal energy. The second stage improves the frequency estimate with a computationally efficient numerical optimization method.