公开(公告)号：US20040130487A1

公开(公告)日：2004-07-08

申请号：US10675583

申请日：2003-09-30

Applicant: Tantivy Communications, Inc.

Inventor： John E. Hoffmann ,  George Rodney Nelson JR. ,  John A. Regnier ,  Kevin P. Johnson

IPC: H01Q003/00

CPC classification number: H01Q21/005 ,  H01Q1/1257 ,  H01Q1/2291

Abstract: A technique for steering a directional antenna such as may be used in a Wireless Local Area Network (WLAN) device. The technique detects signal parameters during reception of short sync pulses in the very beginning portion of a Packet Protocol Data Unit (PPDU) frame. As a result, the antenna can be steered to an optimum direction for reception prior to receiving other portions of a preamble that may be needed to acquire carrier signal phase and frequency.

Abstract translation: 一种用于在无线局域网（WLAN）设备中使用的用于转向定向天线的技术。 该技术在分组协议数据单元（PPDU）帧的最初部分接收短同步脉冲期间检测信号参数。 结果，在接收可能需要获得载波信号相位和频率的前导码的其他部分之前，可以将天线转向最佳方向进行接收。

公开(公告)号：US20030060224A1

公开(公告)日：2003-03-27

申请号：US09792870

申请日：2001-02-23

Applicant: Tantivy Communications, Inc.

Inventor： George R. Nelson JR. ,  James A. Proctor JR. ,  John E. Hoffmann ,  Antoine J. Rouphael

IPC: H04B001/00

CPC classification number: H04W52/242 ,  H04L1/1607 ,  H04L12/5602 ,  H04L47/14 ,  H04L47/26 ,  H04L2001/0093 ,  H04W24/00 ,  H04W52/228 ,  H04W52/48 ,  H04W52/50 ,  H04W74/0825 ,  H04W74/0858

Abstract: In an illustrative embodiment of the present invention, a reference signal including pilot information is transmitted from a base station to one or multiple field units over a pilot channel. A message is also sent to the field units over a paging channel to indicate an effective radiated power level at which the reference signal is transmitted on the pilot channel. Based on a received power level of the reference signal at a field unit and the effective radiated power level of the reference signal, a forward path loss is estimated at the field unit for the forward link between the base station and field unit. Assuming the path loss in the reverse link is approximately the same as the estimated forward link path loss, the field unit can transmit a reply message in the reverse link so that the base station generally receives a message at a desired power level.

Abstract translation: 在本发明的说明性实施例中，包括导频信息的参考信号通过导频信道从基站发送到一个或多个场单元。 消息也通过寻呼信道发送到场单元，以指示在导频信道上发送参考信号的有效辐射功率电平。 基于场单位的参考信号的接收功率电平和参考信号的有效辐射功率电平，在用于基站和场单元之间的前向链路的场单元处估计正向路径损耗。 假设反向链路中的路径损耗与估计的前向链路路径损耗大致相同，则场单元可以在反向链路中发送应答消息，使得基站通常以期望功率电平接收消息。

公开(公告)号：US20010036200A1

公开(公告)日：2001-11-01

申请号：US09778474

申请日：2001-02-07

Applicant: Tantivy Communications, Inc.

Inventor： G. Rodney Nelson ,  John E. Hoffmann ,  Antoine J. Rouphael ,  James A. Proctor JR.

IPC: H04J003/06

CPC classification number: H04W56/0005 ,  H04B7/2668 ,  H04W56/0045 ,  H04W56/005

Abstract: Multiple field units in a CDMA system are synchronized for communication with a base station using a shared forward and reverse link channel. Each field unit is assigned a time slot in a forward link channel to receive messages from the base station. Likewise, each field unit is assigned a time slot on a common reverse link channel for transmitting messages to the base station. Timing alignment among each of many field units and the base station is achieved by analyzing messages received at the base station in a corresponding time slot from each field unit. Thereafter, a message is transmitted in a corresponding time slot to a particular field unit from the base station for adjusting its timing so that future messages transmitted from the field unit are received in the appropriate time slot at the base station. In this way, minimal resources are deployed to maintain communication and precise synchronization between a base station and each of multiple users, minimizing collisions between field units transmitting in adjacent time slots on the reverse link.

Abstract translation: CDMA系统中的多个场单元被同步，以使用共享的前向和反向链路信道与基站进行通信。 每个现场单元在前向链路信道中分配一个时隙以从基站接收消息。 类似地，每个现场单元在公共反向链路信道上分配一个时隙，用于向基站发送消息。 通过在每个场单元的相应时隙中分析在基站处接收的消息来实现多个场单元和基站中的每一个的定时对准。 此后，在相应的时隙中将消息从基站发送到特定的现场单元，以调整其定时，从而在基站的适当的时隙中接收从现场单元发送的未来消息。 以这种方式，部署最小资源以维持基站与多个用户中的每一个之间的通信和精确同步，从而最小化在反向链路上的相邻时隙中发送的现场单元之间的冲突。

公开(公告)号：US20040009785A1

公开(公告)日：2004-01-15

申请号：US10401115

申请日：2003-03-26

Applicant: Tantivy Communications, Inc.

Inventor： George R. Nelson JR. ,  James A. Proctor JR. ,  John E. Hoffmann ,  Antoine J. Rouphael

IPC: H04Q007/20 ,  H04B007/00 ,  H04B001/00

CPC classification number: H04W52/242 ,  H04L1/1607 ,  H04L12/5602 ,  H04L47/14 ,  H04L47/26 ,  H04L2001/0093 ,  H04W24/00 ,  H04W52/228 ,  H04W52/48 ,  H04W52/50 ,  H04W74/0825 ,  H04W74/0858

Abstract: In an illustrative embodiment of the present invention, a reference signal including pilot information is transmitted from a base station to one or multiple field units over a pilot channel. A message is also sent to the field units over a paging channel to indicate an effective radiated power level at which the reference signal is transmitted on the pilot channel. Based on a received power level of the reference signal at a field unit and the effective radiated power level of the reference signal, a forward path loss is estimated at the field unit for the forward link between the base station and field unit. Assuming the path loss in the reverse link is approximately the same as the estimated forward link path loss, the field unit can transmit, a reply message in the reverse link so that the base station generally receives a message at-a desired power level.

Abstract translation: 在本发明的说明性实施例中，包括导频信息的参考信号通过导频信道从基站发送到一个或多个场单元。 消息也通过寻呼信道发送到场单元，以指示在导频信道上发送参考信号的有效辐射功率电平。 基于场单位的参考信号的接收功率电平和参考信号的有效辐射功率电平，在用于基站和场单元之间的前向链路的场单元处估计正向路径损耗。 假设反向链路中的路径损耗与估计的前向链路路径损耗大致相同，则场单元可以在反向链路中发送应答消息，使得基站通常在期望功率电平上接收消息。

公开(公告)号：US20010026599A1

公开(公告)日：2001-10-04

申请号：US09766875

申请日：2001-01-19

Applicant: Tantivy Communications, Inc.

Inventor： John E. Hoffmann ,  George Rodney Nelson JR. ,  James A. Proctor JR. ,  Antoine J. Rouphael

IPC: H03D001/00 ,  H04L027/06 ,  H04B001/10

CPC classification number: H04L5/0046 ,  H04B1/707 ,  H04B2201/70701 ,  H04L7/041

Abstract: A technique for efficient implementation of pilot signals on a reverse link in a wireless communication system. An access channel is defined for the reverse link such that within each frame, or epoch, a portion is dedicated to sending only pilot symbols. Another portion of the frame is reserved for sending mostly data symbols; however, within this second portion of the frame, additional pilot symbols are interleaved among the data symbols. The pilot symbol or preamble portion of the access channel frame allows for efficient acquisition of the access signal at the base station, while providing a timing reference for determining the effects of multipath fading. In particular, a pilot correlation filter provides a phase estimate from the pilot symbols in the preamble portion, which is then used to decode the data symbols in the payload portion. An access acquisition portion of the receiver uses the phase estimates provided by the pilot correlation filter to process the output of a data symbol correlation filter. The additional pilot symbols embedded in the payload portion are used in a cross product operation to further resolve the effects of multipath fading.

Abstract translation: 一种在无线通信系统中在反向链路上有效实现导频信号的技术。 为反向链路定义了一个接入信道，使得在每个帧或时期内，一部分专用于仅发送导频符号。 帧的另一部分保留用于主要发送数据符号; 然而，在帧的该第二部分内，在数据符号之间交织附加的导频符号。 访问信道帧的导频符号或前导码部分允许在基站处有效地获取接入信号，同时提供用于确定多径衰落的影响的定时参考。 具体地，导频相关滤波器从前导码部分中的导频符号提供相位估计，然后该导频符号用于解码有效载荷部分中的数据符号。 接收机的访问获取部分使用由导频相关滤波器提供的相位估计来处理数据符号相关滤波器的输出。 嵌入在有效载荷部分中的附加导频符号用于交叉乘积运算，以进一步解决多路径衰落的影响。

公开(公告)号：US20020136274A1

公开(公告)日：2002-09-26

申请号：US09789476

申请日：2001-02-20

Applicant: Tantivy Communications, Inc.

Inventor： James A. Proctor ,  Antoine J. Rouphael ,  John E. Hoffmann ,  George Rodney Nelson JR.

IPC: H04K001/00 ,  H04B015/00 ,  H04L027/30

CPC classification number: H04W56/001 ,  H04B1/7075 ,  H04B1/70775 ,  H04B1/7103 ,  H04B7/086 ,  H04B2201/70701 ,  H04L27/2273 ,  H04L2027/0057 ,  H04L2027/0087

Abstract: A method for synchronizing a CDMA receiver to a transmitter when an adaptive antenna is utilized to receive transmitted data, wherein a receiving antenna system is adapted between a 360null reception angle pattern (i.e., an omni-directional pattern) and a fixed reception angle (i.e., a directional pattern) by permitting the receiver to identify a pilot signal having the largest magnitude. The receiver minimizes interference from other pilot signals by steering antenna pattern nulls toward other transmitters. As a result, the time required for the receiver to acquire a valid pilot signal is significantly reduced.

Abstract translation: 一种当使用自适应天线来接收发射数据时将CDMA接收机同步到发射机的方法，其中接收天线系统适应于360°接收角度模式（即，全向模式）和固定接收角度 即定向模式），允许接收机识别具有最大幅度的导频信号。 接收器通过向其他发射机转向天线图形零点来最小化来自其他导频信号的干扰。 结果，接收机获取有效导频信号所需的时间显着减少。

公开(公告)号：US20020064182A1

公开(公告)日：2002-05-30

申请号：US09728575

申请日：2000-11-30

Applicant: Tantivy Communications, Inc.

Inventor： John E. Hoffmann ,  George Rodney Nelson JR. ,  James A. Proctor JR. ,  Antoine J. Rouphael

IPC: H04J013/00

CPC classification number: H04L5/005 ,  H04B1/707 ,  H04B7/2628 ,  H04B2201/70701 ,  H04L1/0041 ,  H04L1/0063 ,  H04L1/0065 ,  H04L1/0066 ,  H04L1/0071 ,  H04L5/0048 ,  H04L27/183 ,  H04L27/2657 ,  H04L27/2662

Abstract: A technique for encoding digital communication signals. Data symbols are augmented in pilot symbols inserted at predetermined positions. The pilot augmented sequence is then fed to a deterministic error correction block encoder, such as a turbo product coder, to output a coded sequence. The symbols in the error correction encoded sequence are then rearranged to ensure that the output symbols derived from input pilot symbols are located at regular, predetermined positions. As a result, channel encoding schemes can more easily be used which benefits from power of two length block sizes.

Abstract translation: 一种用于编码数字通信信号的技术。 数据符号在插入预定位置的导频符号中增加。 导频增强序列然后被馈送到诸如turbo乘积编码器的确定性纠错块编码器，以输出编码序列。 然后重新排列纠错编码序列中的符号，以确保从输入导频符号导出的输出符号位于规则的预定位置。 结果，可以更容易地使用信道编码方案，其受益于两个长度块大小的功率。

公开(公告)号：US20010030990A1

公开(公告)日：2001-10-18

申请号：US09738934

申请日：2000-12-15

Applicant: TANTIVY Communications Inc.

Inventor： Antoine J. Rouphael ,  John E. Hoffmann ,  George Rodney Nelson JR. ,  Samir K. Patel ,  James A. Proctor JR. ,  Daniel I. Riley

IPC: H04K001/00 ,  H04B015/00 ,  H04L027/30

CPC classification number: H04B1/707 ,  H04B1/7105 ,  H04B1/712 ,  H04B2201/70703 ,  H04B2201/70705 ,  H04B2201/7071

Abstract: A single, common correlation filter (CF) core is provided in a wireless system using CDMA. A plurality of channels with different data rates are provided in the wireless system. The channels provided in the wireless system include the access channel, the maintenance channel, and the traffic channel in which information (e.g., pilot or data symbols or both) is transmitted at the tier 1, tier 2 and tier 3 rates. The data rate for transmitting the information is programmable by digital signal processor (DSP). A user-unique code, such as a PN code, is applied to the information being transmitted in the channels of the wireless system. The information is QPSK modulated and transmitted in any one of the channels at any data rate. The transmitted information is correlated at the smallest data rate (i.e., the tier 1 rate) in the correlation filter (CF) of the wireless system by time multiplexing delayed versions of the PN code to the correlation filter core. The correlated information is then demultiplexed and pilot aided QPSK demodulated. The demodulated information is summed at the proper integer multiple of the tier 1 rate to achieve the tier 2 and tier 3 rates. The three strongest multipaths (in terms of the received power) are selected in a window or time period for optimal information recovery. Furthermore, three outputs from the demodulated information can be provided and combined for temporal diversity. Spatial diversity is achieved by providing a plurality of antennas at each receiver and a single, common correlation filter at each of the plurality of antennas of the receivers in the wireless system.

Abstract translation: 在使用CDMA的无线系统中提供单个公共相关滤波器（CF）核。 在无线系统中提供具有不同数据速率的多个信道。 在无线系统中提供的信道包括接入信道，维护信道和业务信道，信道（例如，导频或数据符号或两者）以层1，层2和层3速率被传输。 用于传输信息的数据速率可由数字信号处理器（DSP）编程。 诸如PN码的用户唯一码被应用于在无线系统的频道中发送的信息。 该信息以任何数据速率在任何一个信道中进行QPSK调制和传输。 所发送的信息通过将PN码的延迟版本时间复用到相关滤波器核心，以无线系统的相关滤波器（CF）中的最小数据速率（即，层1速率）相关。 然后将相关信息解复用并进行导频辅助QPSK解调。 解调信息以1级速率的适当整数倍相加，以实现2级和3级速率。 在窗口或时间段中选择三个最强的多路径（以接收功率计），以获得最佳信息恢复。 此外，可以提供来自解调信息的三个输出并将其组合用于时间分集。 通过在每个接收机处提供多个天线以及在无线系统中的接收机的多个天线的每个天线处提供单个公共相关滤波器来实现空间分集。

公开(公告)号：US20040114535A1

公开(公告)日：2004-06-17

申请号：US10675563

申请日：2003-09-30

Applicant: Tantivy Communications, Inc.

Inventor： John E. Hoffmann ,  George Rodney Nelson JR. ,  John A. Regnier ,  Kevin P. Johnson

IPC: H04L012/26

CPC classification number: H04B7/088 ,  H04B17/318

Abstract: A Station Management Entity (SME) steers a directional antenna for a station to communicate with an Access Point (AP) in an 802.11 protocol system. The SME can steer the antenna before or after an 802.11 station has authenticated and associated with the Access Point. During a passive scan, the steering process cycles through the available antenna positions and monitors an AP beacon signal to determine a best position based on, for example, a Received Signal Strength Indication (RSSI). During an active scan where access probing is used, the steering process cycles through the antenna positions and monitors a probe response to determine the best antenna position. Additional scans may be performed based on a decision that the received signal level of the currently selected antenna position has dropped below a predetermined threshold.

Abstract translation: 站管理实体（SME）引导站的定向天线与802.11协议系统中的接入点（AP）进行通信。 在802.11站已通过认证并与接入点相关联之前或之后，SME可以引导天线。 在被动扫描期间，转向过程循环通过可用的天线位置并且监视AP信标信号，以基于例如接收信号强度指示（RSSI）来确定最佳位置。 在使用接入探测的主动扫描期间，转向过程循环通过天线位置并监视探测响应以确定最佳天线位置。 可以基于当前选择的天线位置的接收信号电平已经下降到预定阈值以下的判定来执行附加扫描。

公开(公告)号：US20040033817A1

公开(公告)日：2004-02-19

申请号：US10378565

申请日：2003-03-03

Applicant: Tantivy Communications, Inc.

Inventor： Thomas E. Gorsuch ,  John A. Regnier ,  John E. Hoffmann ,  George Rodney Nelson JR. ,  James A. Proctor JR.

IPC: H04B001/02

CPC classification number: H01Q1/2275 ,  H01Q1/22 ,  H01Q1/2258 ,  H01Q1/242 ,  H01Q3/2605 ,  H01Q19/32

Abstract: An antenna control interface is integrated with common integrated circuit components, such as radio transceiver or baseband modem signal processing control logic. The antenna control interface controls the operation of an adaptive antenna array used with wireless communication system devices.

Abstract translation: 天线控制接口与通用集成电路组件集成，如无线电收发器或基带调制解调器信号处理控制逻辑。 天线控制接口控制与无线通信系统设备一起使用的自适应天线阵列的操作。