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：US20040125036A1

公开(公告)日：2004-07-01

申请号：US10664413

申请日：2003-09-17

Applicant: Tantivy Communications, Inc.

Inventor： Bing Chiang ,  Kenneth M. Gainey ,  James A. Proctor JR. ,  Antoine J. Rouphael ,  Griffin K. Gothard ,  Michael J. Lynch

IPC: H01Q003/00

CPC classification number: H01Q3/2641 ,  H01Q1/22 ,  H01Q1/2258 ,  H01Q9/16 ,  H01Q19/26 ,  H01Q19/32 ,  H01Q21/08 ,  H01Q21/20 ,  H01Q21/29

Abstract: An antenna assembly includes at least two active or main radiating omni-directional antenna elements arranged with at least one beam control or passive antenna element used as a reflector. The beam control antenna element(s) may have multiple reactance elements that can electrically terminate it to adjust the input or output beam pattern(s) produced by the combination of the active antenna elements and the beam control antenna element(s). More specifically, the beam control antenna element(s) may be coupled to different terminating reactances to change beam characteristics, such as the directivity and angular beamwidth. Processing may be employed to select which terminating reactance to use. Consequently, the radiator pattern of the antenna can be more easily directed towards a specific target receiver/transmitter, reduce signal-to-noise interference levels, and/or increase gain by using Radio Frequency (RF), Intermediate Frequency (IF), or baseband processing. A Multiple-Input, Multiple-Output (MIMO) processing technique may be employed to operate the antenna assembly with simultaneous beam patterns.

Abstract translation: 天线组件包括至少两个有源或主辐射全向天线元件，其布置有用作反射器的至少一个光束控制或无源天线元件。 波束控制天线元件可以具有多个电抗元件，其可以电气端接它，以调节由有源天线元件和波束控制天线元件的组合产生的输入或输出波束图案。 更具体地，波束控制天线元件可以耦合到不同的终止电抗以改变诸如方向性和角波束宽度的波束特性。 可以使用处理来选择要使用的终止电抗。 因此，通过使用射频（RF），中频（IF）或更高的频率，可以更容易地将天线的辐射器模式引向特定目标接收器/发射器，降低信噪比干扰电平和/或增加增益 基带处理。 可以采用多输入多输出（MIMO）处理技术来操作具有同时波束图案的天线组件。

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：US20020159395A1

公开(公告)日：2002-10-31

申请号：US09792637

申请日：2001-02-23

Applicant: Tantivy Communications, Inc.

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

IPC: H04L012/26

CPC classification number: H04W72/042 ,  H04J13/00 ,  H04J13/0003 ,  H04L5/22 ,  H04W24/00 ,  H04W28/22 ,  H04W48/08 ,  H04W52/24 ,  H04W52/26 ,  H04W52/365 ,  H04W72/0406 ,  H04W72/0446 ,  H04W72/0466 ,  H04W72/0473 ,  H04W72/048 ,  H04W72/1289 ,  Y02D70/00

Abstract: Data rate allocation decisions are made for a communications channel, such as a wireless reverse link connection. A first parameter used in this determination is a path loss, which is determined by the following process. First, a message is sent from a first station to a second station, such as on a paging channel. The message indicates a forward Effective Radiated Power (ERP) of a pilot signal transmitted by the first station. The second station then determines the received signal strength of this pilot signal, taking into account receiver gains. The path loss can then be estimated by the second station as the difference between the forward ERP data value that it received and the detected received pilot power. The second station also then preferably determines a transmit power level when transmitting a message back to the first station. This transmit power level information is encoded as a digital data word together with the forward path loss information as calculated by the first station. Upon receipt of these two pieces of information by the first station, the forward path loss estimate as calculated by the second station, and the output power value of the second station, the first station can then determine the amount of excess power available at the field unit. This excess power difference is indicative of the amount of dynamic range available in the transmit power amplifier in the particular second station. With this information, the first station can then make a determination as to whether coding rates which require a higher dynamic range will be acceptable for use by the particular second station.

Abstract translation: 对于诸如无线反向链路连接的通信信道进行数据速率分配决定。 在该确定中使用的第一参数是通过以下过程确定的路径损耗。 首先，消息从第一站发送到第二站，例如在寻呼信道上。 该消息指示由第一站发送的导频信号的前向有效辐射功率（ERP）。 然后，第二站根据接收机增益确定该导频信号的接收信号强度。 然后可以由第二站估计路径损耗作为其接收到的前向ERP数据值与检测到的接收导频功率之间的差值。 然后，当发送消息回到第一站时，第二站优选地确定发射功率电平。 该发送功率电平信息与由第一电台计算出的正向路径损耗信息一起被编码为数字数据字。 在由第一站接收到这两条信息时，由第二站计算出的正向路径损耗估计值和第二站的输出功率值，则第一站然后可以确定在现场可用的多余的功率量 单元。 该过剩功率差表示特定第二站中的发射功率放大器中可用的动态范围的量。 利用该信息，第一站然后可以确定需要更高动态范围的编码率是否可被特定的第二站使用。

公开(公告)号：US20020080024A1

公开(公告)日：2002-06-27

申请号：US09775305

申请日：2001-02-01

Applicant: Tantivy Communications, Inc.

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

IPC: H04B007/01

CPC classification number: H04W56/0085 ,  H04B7/2637

Abstract: Multiple field units in a CDMA system are synchronized for communication with a base station using shared forward and reverse link channels. In an illustrative embodiment, 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 and power level control 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 as transmitted by each field unit. Thereafter, a message is transmitted from the base station in a corresponding time slot to a particular field unit for adjusting its timing or power level so that future messages transmitted from the field unit are received in the appropriate time slot at the base station at a desired power level. 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. This method reduces the frequency a field unit must rely on the use of a slotted aloha random access channel according to IS-95.

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。 在说明性实施例中，每个现场单元在前向链路信道中分配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。 通过在每个场单元发送的相应时隙中分析在基站处接收的消息来实现许多场单元和基站中的每一个中的定时对准和功率电平控制。 此后，在对应的时隙中从基站发送消息到特定的现场单元，以调整其定时或功率电平，使得在现场单元发送的未来消息在基站的适当时隙中以期望的 能量等级。 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。 该方法降低了场单元必须依赖于使用根据IS-95的时隙aloha随机接入信道的频率。

公开(公告)号：US20010048709A1

公开(公告)日：2001-12-06

申请号：US09773253

申请日：2001-01-31

Applicant: Tantivy Communications, Inc.

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

IPC: H04B001/69

CPC classification number: H04L1/0048 ,  G11B20/1833 ,  H03M13/35 ,  H04B1/707 ,  H04J13/00 ,  H04L1/0003 ,  H04L1/0007 ,  H04L1/0009 ,  H04L1/0025 ,  H04L1/1809 ,  H04L1/1816 ,  H04L25/14 ,  H04L27/22 ,  H04L27/38 ,  H04L2001/0093 ,  H04L2001/0096

Abstract: The present invention provides for making code rate adjustments and modulation type adjustments in a pseudonoise (PN) encoded CDMA system. Coding rate adjustments may be made by changing the number of information bits per symbol, or Forward Error Code (FEC) coding rate. A forward error correction (FEC) block size is maintained at a constant amount. Therefore, as the number of information bits per symbol are increased, an integer multiple of bits per epoch is always maintained. The scheme permits for a greater flexibility and selection of effective data rates providing information bit rates ranging from, for example, approximately 50 kilobits per second to over 5 mega bits per second (Mbps) in one preferred embodiment.

Abstract translation: 本发明提供了在伪噪声（PN）编码的CDMA系统中进行码率调整和调制类型调整。 可以通过改变每个符号的信息比特数或转发错误码（FEC）编码率来进行编码速率调整。 前向纠错（FEC）块大小保持恒定的量。 因此，随着每个符号的信息位的数量增加，始终保持每个时期的位的整数倍。 在一个优选实施例中，该方案允许更大的灵活性和有效数据速率的选择，从而提供从例如大约50千比特每秒到超过5兆比特每秒（Mbps）的信息比特率。

公开(公告)号：US20010033579A1

公开(公告)日：2001-10-25

申请号：US09792410

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: H04L012/413

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 first channel is allocated for transmitting sporadically generated messages from multiple field units to a base station. The first channel is preferably divided into time slots in which a field unit transmits an access request message to the base station for establishing a communication link. In response to an access request message, feedback information is provided from the base station to multiple field units indicating whether a collision was detected on the first channel for a message transmitted in a previous time slot. In an instance when a collision is detected, the field unit will re-transmit an access request message at a previous power level setting based on a random back off time. If no collision is detected and the base station fails to transmit an acknowledgment message from the base station to the access requesting field unit, the power output level of the field unit is increased for successive message transmissions until the message is received.

Abstract translation: 在本发明的说明性实施例中，分配第一信道用于将来自多个场单元的偶发生成的消息发送到基站。 第一信道优选地被划分为时隙，其中，场单元向基站发送接入请求消息以建立通信链路。 响应于访问请求消息，反馈信息从基站提供给多个字段单元，指示在第一信道上是否检测到在先前时隙中发送的消息的冲突。 在检测到冲突的情况下，场单元将基于随机退避时间在先前功率电平设置下重新发送接入请求消息。 如果没有检测到冲突，并且基站无法从基站向接入请求字段单元发送确认消息，则对于连续的消息传输增加了现场单元的功率输出电平，直到接收到消息。

公开(公告)号：US20030165155A1

公开(公告)日：2003-09-04

申请号：US10266079

申请日：2002-10-07

Applicant: Tantivy Communications, Inc.

Inventor： Kevin P. Johnson ,  Antoine J. Rouphael ,  George Rodney Nelson JR.

IPC: H04B007/212

CPC classification number: H04L1/0045 ,  H04L1/004 ,  H04L1/0041 ,  H04L2001/0093 ,  H04W28/06 ,  H04W72/0413 ,  H04W72/0446 ,  H04W74/004 ,  H04W74/006

Abstract: A technique for a time division multiplex system in which access to shared broadcast communication media is granted on a demand basis. Particular connections are assigned slot times at the transmitter based on demand. However, no specific information regarding the assignment of time slots need be communicated to the receivers. The transmit side employs a forward error correction technique followed by multiplication by a cover sequence unique to each connection. All receivers listen to the broadcast transmission channel all of the time. The receiver assigned to each connection decodes the signals in such a manner that only the receiver with the correct cover sequence assigned to a particular connection will successfully decode the data associated with that connection. Data frames that fail the forward error correction process are discarded, and only those frames which are successfully decoded are passed up to a higher layer. The occurrence of an erroneously received frame is not necessarily always reported to the transmit side of the connection; only a packet level error indication is made. In this way, information containing time slot assignment need not be communicated between the transmitter and receiver, and yet data will be correctly received.