公开(公告)号：WO2007081595A2

公开(公告)日：2007-07-19

申请号：PCT/US2006049704

申请日：2006-12-29

Applicant: PHOTRON TECHNOLOGIES LTD ,  KLUESING ALVIN DALE ,  MANAPRAGADA SAI C

Inventor： KLUESING ALVIN DALE ,  MANAPRAGADA SAI C

IPC: H04L5/12

CPC classification number: H04L27/0008

Abstract: Systems and methods for providing modulation on demand in a narrowband communication system are provided. Modulation on demand is accomplished by a novel modulation scheme that achieves high bandwidth efficiency for various channel conditions and modulation parameters. Such modulation parameters may include the carrier frequency, the number of RF cycles per bit, and the number of samples per RF cycle, among others. A communication system employing the modulation on demand scheme transmits a message signal via one or more look-up tables storing samples representing the modulated message signal.

Abstract translation: 提供了一种用于在窄带通信系统中提供按需调制的系统和方法。 按需调制是通过一种新颖的调制方案完成的，该方案可实现各种信道条件和调制参数的高带宽效率。 这样的调制参数可以包括载波频率，每比特的RF周期数，以及每个RF周期的样本数等。 采用按需调制方式的通信系统经由存储有表示调制消息信号的样本的一个或多个查找表来发送消息信号。

公开(公告)号：WO2007030308A2

公开(公告)日：2007-03-15

申请号：PCT/US2006032643

申请日：2006-08-22

Applicant: INTERDIGITAL TECH CORP ,  DAI QINGYUAN ,  OLESEN ROBERT LIND ,  KOO CHANG-SOO ,  SHAH NIRAV

Inventor： DAI QINGYUAN ,  OLESEN ROBERT LIND ,  KOO CHANG-SOO ,  SHAH NIRAV

IPC: H04L5/12

CPC classification number: H04L27/3809 ,  H04L25/067

Abstract: A method and apparatus for de-mapping a symbol modulated by a high order quadrature amplitude modulation (QAM) are disclosed. A transmitting wireless transmit/receive unit (WTRU) maps N input bits to one of 2N symbols in a 2N-QAM constellation. A receiving WTRU receives a signal and generates a sample of the received signal. A soft bit value of the most significant bit (MSB) is calculated based on a value of the sample. A magnitude of the soft bit value of the MSB is subtracted from a threshold. The threshold is initially set with respect to the QAM order, N. A soft bit value of the next MSB is calculated based on the subtraction results. The calculation and subtraction steps are repeated for the next MSB until soft bit values of all the remaining bits are obtained while diving the threshold by 2 each iteration.

Abstract translation: 公开了一种用于解映射由高阶正交幅度调制（QAM）调制的符号的方法和装置。 发射无线发射/接收单元（WTRU）将N个输入比特映射到2N-QAM星座中的2N个符号之一。 接收WTRU接收信号并产生接收信号的采样。 基于样本的值计算最高有效位（MSB）的软比特值。 从阈值中减去MSB的软比特值的大小。 阈值初始设置为相对于QAM顺序，N根据减法结果计算下一个MSB的软比特值。 对于下一个MSB重复计算和减法步骤，直到获得所有剩余比特的软比特值，同时将阈值每次迭代2次。

公开(公告)号：WO2006065275A1

公开(公告)日：2006-06-22

申请号：PCT/US2005/019080

申请日：2005-06-01

Applicant: SMARTLABS, INC. ,  CREGG, Daniel, Brian ,  ESCOBOSA, Marcus, P. ,  WALTER, Ronald, J. ,  BARTLEY, Donald, J.

Inventor： CREGG, Daniel, Brian ,  ESCOBOSA, Marcus, P. ,  WALTER, Ronald, J. ,  BARTLEY, Donald, J.

IPC: H04L5/12 ,  H04L27/30 ,  H04L12/28

CPC classification number: H04J13/00 ,  H04B3/542 ,  H04B2203/5408 ,  H04B2203/5416 ,  H04B2203/542 ,  H04B2203/5441 ,  H04B2203/5445 ,  H04B2203/5479 ,  H04L1/0057 ,  H04L1/1867 ,  H04L12/18 ,  H04L12/2803 ,  H04L2001/0092 ,  H04L2012/2841 ,  H04L2012/2843 ,  H05B37/0272 ,  Y02B20/48

Abstract: Low-cost intelligent control and communication devices (21, 22, 23, 51, 52) are arranged to communicate with one another over one or more shared physical media (10, 11), such as a powerline or a radio frequency band. No network controller is needed, because any device can act as a master, slave or repeater. Adding more devices makes the system more robust, by virtue of a simple protocol (30, 50, 60) for communication retransmissions and retries.

Abstract translation: 低成本智能控制和通信设备（21,22,23,51,52）被布置成通过一个或多个共享物理介质（10,11）（诸如电力线或无线电频带）彼此通信。 不需要网络控制器，因为任何设备都可以作为主机，从机或中继器。 通过为通信重传和重试提供简单的协议（30,50,60），增加更多的设备使系统更加健壮。

公开(公告)号：WO2005065070A3

公开(公告)日：2005-07-21

申请号：PCT/US2004/024656

申请日：2004-07-29

Applicant: ZYRAY WIRELESS, INC. ,  CATREUX, Severine ,  ERCEG, Vinko ,  ROUX, Pieter, W. ,  VAN ROOYEN, Pieter ,  WINTERS, Jack

Inventor： CATREUX, Severine ,  ERCEG, Vinko ,  ROUX, Pieter, W. ,  VAN ROOYEN, Pieter ,  WINTERS, Jack

IPC: H04B1/69 ,  H04B1/707 ,  H04B1/713 ,  H04L5/12 ,  H04L23/02 ,  H04L27/04 ,  H04L27/12 ,  H04L27/20 ,  H03C1/52 ,  H03C3/00 ,  H03K7/06

Abstract: A system and method for generating transmit weighting values (514) for signal weighting that may be used in various transmitter and receiver structures is disclosed herein. The weighting values are determined as a function of frequency based upon a state of a communication channel (512) and the transmission mode of the signal. In variations, weighting of the weighted signal that is transmitted through each of a plurality of antennas is carried out with one of a corresponding plurality of transmit antenna spatial weights (522). In these variations, a search may be conducted over various combinations of transmit weighting values and transmit antenna spatial weights in order to find a weight combination that optimizes a performance measure such as the output signal-to-noise ratio, the output bit error rate or the output packet error rate.

公开(公告)号：WO2004014032A2

公开(公告)日：2004-02-12

申请号：PCT/US0323965

申请日：2003-08-01

Applicant: AWARE INC

Inventor： DEL ANGEL GUILLERMO ,  FRIEDMANN ARNON ,  SANDBERG STUART ,  GROSS RICHARD

IPC: H04L5/12 ,  H04L23/02 ,  H04L25/03 ,  H04L27/26

CPC classification number: H04L25/03191 ,  H04L25/03057 ,  H04L25/03159 ,  H04L25/03197 ,  H04L25/03203 ,  H04L25/03267 ,  H04L25/03337 ,  H04L2025/03414 ,  H04L2025/0349 ,  H04L2025/03522

Abstract: An input estimator is based on a combined MFDQ-DF and trellis for use in, for example, an ADSL environment. In particular, for an ADSL implementation, the system will have one feedback tap for the decision feedback. However, it should be appreciated that the idea and basic concept of using the structure of a trellis to aid in determining the feedback point can be extended to any system using a feedback equalizer to estimate input to a trellis decoder.

Abstract translation: 输入估计器基于用于例如ADSL环境的组合MFDQ-DF和网格。 特别地，对于ADSL实现，系统将有一个反馈抽头用于决策反馈。 然而，应当理解，使用网格的结构来帮助确定反馈点的想法和基本概念可以扩展到使用反馈均衡器来估计对格状解码器的输入的任何系统。

公开(公告)号：WO02056567A3

公开(公告)日：2002-12-05

申请号：PCT/IL0200002

申请日：2002-01-02

Applicant: COMSYS COMM & SIGNAL PROC LTD ,  RESHEF EHUD

Inventor： RESHEF EHUD

IPC: H03D1/00 ,  H03D3/22 ,  H03M13/23 ,  H04B1/38 ,  H04L1/00 ,  H04L5/12 ,  H04L23/02 ,  H04L25/02 ,  H04L25/06 ,  H04L27/20 ,  H04L27/22 ,  H04M20060101

CPC classification number: H04L1/0054 ,  H04L1/0059 ,  H04L1/0068 ,  H04L1/0071 ,  H04L25/067 ,  H04L27/38

Abstract: An apparatus for and method of reducing the soft output information packet (96) to be computed by a soft symbol generator. The reduced soft output information packet generated by the soft symbol generator (27) is subsequently used by a soft symbol to soft bit mapper which functions to convert soft symbol decision information into soft bit decision information. A symbol competitor table is constructed that includes the most likely symbol competitors for each bit of the symbol. The table is populated with m entries for each possible symbol value, where m represents the number of bits per symbol. Symbol competitors are retrieved from the table in accordance with the hard decision (68). Soft symbol information is generated only for the symbol competitors rather than for all possible symbol thus substantially reducing the size of the information packet.

Abstract translation: 一种减少由软符号生成器计算的软输出信息分组（96）的设备和方法。 由软符号生成器（27）生成的简化的软输出信息包随后由软符号用于软比特映射器，该软比特映射器用于将软符号判定信息转换为软比特判定信息。 构建符号竞争者表，其中包括符号的每个比特最有可能的符号竞争者。 为每个可能的符号值填入m个表项，其中m表示每个符号的位数。 根据硬判决（68）从表中检索符号竞争者。 软符号信息仅为符号竞争者而不是所有可能的符号生成，从而显着减小信息分组的大小。

公开(公告)号：WO0198618A8

公开(公告)日：2002-08-29

申请号：PCT/US0119900

申请日：2001-06-22

Applicant: HALLIBURTON ENERGY SERV INC

Inventor： WEI MICHAEL ,  TRAINOR WILLIAM

IPC: G08C19/00 ,  E21B47/12 ,  G01V3/00 ,  G01V11/00 ,  G08C15/04 ,  H04B3/03 ,  H04B3/10 ,  H04L27/34 ,  G08C15/08 ,  E21B34/06 ,  E21B47/00 ,  G01R31/08 ,  G08C15/00 ,  G08C15/12 ,  H04J1/16 ,  H04J3/06 ,  H04J3/14 ,  H04L1/00 ,  H04L5/12 ,  H04L12/26 ,  H04L23/02 ,  H04L27/36

CPC classification number: H04L27/34 ,  E21B47/12 ,  G01V11/00

Abstract: A downhole telemetry system that transmits a burst-QAM uplink signal to the surface of the well is disclosed. In a preferred embodiment, the well includes composite tubing having circumferentially-spaced electrical conductors helically wound within the walls of the tubing. A downhole instrument coupled to a pair of adjacent conductors transmits a burst-QAM uplink signal to a surface system similarly coupled to the pair of adjacent conductors. The burst-QAM signal, preferably comprises a series of data frames (602) carrying telemetry data. Each data frame is preferably preceded by a quiet interval (604) (when no signal is present), a timing synchronization sequence, and a training sequence (606, 608). The timing synchronization sequence is designed for easy timing recovery at the surface, and the training sequence is designed to aid the adaptation of the equalizer. The data frame itself preferably includes a synchronization field, a data count, and a checksum in addition to the data. Direct digital synthesis is preferably employed to modulate the uplink signal.

Abstract translation: 公开了一种将突发QAM上行链路信号发送到井表面的井下遥测系统。 在优选实施例中，井包括具有在管道的壁内螺旋缠绕的周向隔开的电导体的复合管。 耦合到一对相邻导体的井下仪器将突发QAM上行链路信号传输到类似地耦合到该对相邻导体的表面系统。 突发QAM信号优选地包括携带遥测数据的一系列数据帧（602）。 每个数据帧优选地先于静默间隔（604）（当没有信号存在时），定时同步序列和训练序列（606,608）。 定时同步序列被设计为便于表面的定时恢复，并且训练序列被设计为有助于均衡器的适配。 除了数据之外，数据帧本身优选地包括同步字段，数据计数和校验和。 直接数字合成优选地用于调制上行链路信号。

公开(公告)号：WO01047260A1

公开(公告)日：2001-06-28

申请号：PCT/US2000/033479

申请日：2000-12-08

IPC: H04L5/12 ,  H04L27/00 ,  H04N5/44 ,  H04N5/455 ,  H04N7/08 ,  H04N7/081 ,  H04N11/24 ,  H04N11/00

CPC classification number: H04L5/12 ,  H04N5/4446 ,  H04N5/455 ,  H04N7/08 ,  H04N11/008 ,  H04N21/4382

Abstract: The present invention improves the performance of data receivers used for demodulating the data signals described in the international application WO 99/55087 by employing a novel method of spectrum processing to synthesize a full double sideband spectrum with the video signal and the data signal in quadrature. The novel techniques of the present invention enable several important advantages including but not limited to signal to noise ratio improvement, relaxation of circuit design constraints, mixed signal integrated circuit implementation, and for higher data rates. The present invention also improves the demodulation of television signals.

Abstract translation: 本发明通过采用与视频信号和数据信号正交合成全双边带频谱的新颖的频谱处理方法来改进用于解调国际申请WO 99/55087中描述的数据信号的数据接收机的性能。 本发明的新技术实现了几个重要的优点，包括但不限于信噪比改善，电路设计约束的松弛，混合信号集成电路实现以及更高的数据速率。 本发明还改进了电视信号的解调。

公开(公告)号：WO01033740A1

公开(公告)日：2001-05-10

申请号：PCT/US2000/029798

申请日：2000-10-27

IPC: H04B7/216 ,  H04L5/12 ,  H04L27/20

CPC classification number: H04L5/12 ,  H04B7/216

Abstract: A system and method for increasing feeder link capacity in a satellite communication system (100), wherein a gateway (108) communicates with a satellite (102) over a feeder link (112), and wherein the satellite (102) communicates with terrestrial user terminals (106) over a user link (110). A feeder link signal (112) is produced by multiplexing a first BPSK signal and a second BPSK signal (402). The feeder link signal (612) is QPSK modulated, QPSK spread (402). The feeder link signal (612) is transmitted from the gateway (108) to the satellite (102). The satellite (102) demultiplexes the feeder link signal (612), recovering the first and second BPSK signals (702, 704, 706). The first and second BPSK signals are then modulated (502-508)(602-608), to produce a first and second user link signal (832, 834). The user link signals (832, 834) are BPSK modulated, QPSK spread. The user link signals (832, 834) are transmitted from the satellite (102) to the user terminals (106).

Abstract translation: 一种用于在卫星通信系统（100）中增加馈线链路容量的系统和方法，其中网关（108）通过馈线链路（112）与卫星（102）进行通信，并且其中所述卫星（102）与地面用户 终端（106）在用户链路（110）之上。 馈线链路信号（112）通过多路复用第一BPSK信号和第二BPSK信号（402）来产生。 馈线链路信号（612）被QPSK调制，QPSK扩展（402）。 馈线链路信号（612）从网关（108）发送到卫星（102）。 卫星（102）对馈线链路信号（612）进行解复用，恢复第一和第二BPSK信号（702,704,706）。 然后调制第一和第二BPSK信号（502-508）（602-608），以产生第一和第二用户链路信号（832,834）。 用户链接信号（832,834）被BPSK调制，QPSK扩展。 用户链接信号（832,834）从卫星（102）发送到用户终端（106）。

公开(公告)号：WO01031800A1

公开(公告)日：2001-05-03

申请号：PCT/US2000/027084

申请日：2000-09-28

IPC: H04B1/40 ,  H04L7/02 ,  H04L7/033 ,  H04L25/03 ,  H04L27/38 ,  H04B1/38 ,  H03D1/24 ,  H03M1/00 ,  H04L5/12

CPC classification number: H04L7/0054 ,  H04B1/406 ,  H04L7/0334 ,  H04L25/03834 ,  H04L27/38

Abstract: A timing recovery system and method for QAM signals having different symbol rates are disclosed. After sampling the QAM baseband signal (FIG. 11, step 282), a symbol timing recovery logic including a generator of a weigthting function is utilized to develop a local error signal (FIG. 11, step 286). The local error signal is averaged over a predetermined time period (FIG. 11, step 286) and is utilized to make a global decision regarding the sampling point position relative to the baseband signal maximum/minimum (FIG. 11, step 288).

Abstract translation: 公开了具有不同符号率的QAM信号的定时恢复系统和方法。 在对QAM基带信号进行采样（图11，步骤282）之后，利用包括重量函数的发生器的符号定时恢复逻辑来产生局部误差信号（图11，步骤286）。 局部误差信号在预定时间周期内被平均（图11，步骤286），并用于相对于基带信号最大值/最小值对采样点位置进行全局判定（图11，步骤288）。