公开(公告)号：US06496543B1

公开(公告)日：2002-12-17

申请号：US08741320

申请日：1996-10-29

申请人： Ephraim Zehavi

发明人： Ephraim Zehavi

IPC分类号： H04L2704

CPC分类号： H04W28/22 ,  H04L1/0003 ,  H04L1/0009 ,  H04L1/0026 ,  H04L1/0072 ,  H04W24/00 ,  H04W28/18 ,  H04W72/0473 ,  H04W72/08 ,  H04W84/042 ,  Y02D70/00

摘要： A method and apparatus for transmitting digital data in a cellular environment. Adjacent cells of the cellular system are prevented from simultaneously transmitting data. Because the noise from transmissions of adjacent cells is a primary source of interference, the transmission rate of power limited base stations can be dramatically increased when the noise from adjacent cells is eliminated. The transmissions to each subscriber station are made at a fixed transmission power level. However, the data rate of transmitted signals differs from one subscriber station to another depending the path loss differences. In a first exemplary embodiment, the data rate of transmissions to a subscriber station is determined by selecting an encoding rate for the transmitted signal while holding the symbol rate constant. In a second exemplary embodiment, the data rate of transmissions to a subscriber station is determined by selection a modulation format for the transmitted signal which directly changes the symbol rate of transmission to a subscriber station.

摘要翻译： 一种用于在蜂窝环境中发送数字数据的方法和装置。 防止蜂窝系统的相邻小区同时发送数据。 由于来自相邻小区的传输的噪声是主要的干扰源，当消除来自相邻小区的噪声时，功率受限基站的传输速率可以显着增加。 向每个用户站的传输是以固定的传输功率级别进行的。 然而，传输信号的数据速率根据路径损耗差异而不同于一个用户站到另一个用户站。 在第一示例性实施例中，通过在保持符号率恒定的同时选择发送信号的编码率来确定向订户站的传输的数据速率。 在第二示例性实施例中，通过选择用于直接将符号传输速率改变到订户站的发送信号的调制格式来确定向订户站的传输的数据速率。

公开(公告)号：US5844922A

公开(公告)日：1998-12-01

申请号：US779638

申请日：1997-01-07

申请人： Jack Keil Wolf ,  Ephraim Zehavi

发明人： Jack Keil Wolf ,  Ephraim Zehavi

IPC分类号： H03M13/00 ,  H03M13/25 ,  H04L1/00 ,  G06F11/10

CPC分类号： H04L1/006 ,  H03M13/256 ,  H03M13/3776 ,  H03M13/41 ,  H03M13/6362 ,  H04L1/0041 ,  H04L1/0054 ,  H04L1/0068

摘要： A method and apparatus for constructing high rate trellis codes for PSK modulation that can be encoded and decoded using the encoder and decoder for a rate 1/2 punctured convolutional code. In particular, the design of trellis encoders and decoders for 2.sup.k -PSK modulation for rates (km-1)/km for k.gtoreq.3 and m.gtoreq.1 is provided.

公开(公告)号：US5822318A

公开(公告)日：1998-10-13

申请号：US283308

申请日：1994-07-29

申请人： Edward G. Tiedemann, Jr. ,  Klein S. Gilhousen ,  Joseph P. Odenwalder ,  Ephraim Zehavi ,  Jeffrey A. Levin ,  Charles E. Wheatley, III

发明人： Edward G. Tiedemann, Jr. ,  Klein S. Gilhousen ,  Joseph P. Odenwalder ,  Ephraim Zehavi ,  Jeffrey A. Levin ,  Charles E. Wheatley, III

IPC分类号： H04B7/00 ,  H04B7/005 ,  H04B7/26 ,  H04L1/00 ,  H04L1/08 ,  H04Q7/30

CPC分类号： H04W52/265 ,  H04L1/0002 ,  H04L1/0014 ,  H04L1/0021 ,  H04L1/0025 ,  H04L1/08 ,  H04W52/267 ,  Y02B60/50

摘要： A method and apparatus for controlling transmission power in a variable rate communication system is disclosed. The method disclosed provides for a closed loop power control method. A first remote station controls the transmission power of a second remote station by transmitting a rate dependent power control signal to the second remote communication station. Since only the second communication knows its transmission rate a priori, it must determine its course of action in accordance with both the received power control signal and the knowledge of its transmission rate.

摘要翻译： 公开了一种用于控制可变速率通信系统中的发射功率的方法和装置。 所公开的方法提供了一种闭环功率控制方法。 第一远程站通过向第二远程通信站发送与速率相关的功率控制信号来控制第二远程站的发射功率。 由于只有第二通信先验地知道其传输速率，所以它必须根据接收到的功率控制信号和其传输速率的知识确定其行动过程。

公开(公告)号：US5581575A

公开(公告)日：1996-12-03

申请号：US539490

申请日：1995-10-05

申请人： Ephraim Zehavi ,  Andrew J. Viterbi

发明人： Ephraim Zehavi ,  Andrew J. Viterbi

IPC分类号： H04L27/18 ,  H03M13/23 ,  H03M13/27 ,  H04B1/707 ,  H04B14/04 ,  H04J3/16 ,  H04L1/00 ,  H04L1/08 ,  H04L25/22 ,  H04L27/30

CPC分类号： H04L1/08 ,  H03M13/2707 ,  H04B1/707 ,  H04L1/0013 ,  H04L1/0043 ,  H04L1/0052 ,  H04L1/0065 ,  H04L1/0071

摘要： A communication system for transmitting variable rate data is disclosed wherein redundancy is added to the variable rate data to provide repetition symbols. The repetition symbol data is transmitted with symbol energy scaled in accordance to the rate of the variable rate data when the variable rate data is greater than or equal to a nominal data rate. When the variable rate data is less than the nominal data rate, the symbol data is transmitted at nominal symbol energy and redundancy is removed by transmission gating of a proportion of the transmission symbol data determined in accordance with the rate of the variable rate data. Furthermore, a receiver for receiving the variable rate data is disclosed which uses the redundancy in the transmitted data symbol stream to make a corrected estimate of the transmitted symbol data.

摘要翻译： 公开了用于发送可变速率数据的通信系统，其中将冗余添加到可变速率数据以提供重复符号。 当可变速率数据大于或等于标称数据速率时，按照可变速率数据的速率对符号能量进行缩放，发送重复符号数据。 当可变速率数据小于标称数据速率时，以标称符号能量发送符号数据，并且通过根据可变速率数据的速率确定的传输符号数据的一部分的传输门控来去除冗余。 此外，公开了一种用于接收可变速率数据的接收机，其使用所发送的数据符号流中的冗余来对发送的符号数据进行校正的估计。

公开(公告)号：US5471497A

公开(公告)日：1995-11-28

申请号：US146642

申请日：1993-11-01

申请人： Ephraim Zehavi

发明人： Ephraim Zehavi

IPC分类号： H04B7/26 ,  H04B1/707 ,  H04J11/00 ,  H04J13/00 ,  H04L1/08 ,  H04L27/30 ,  H04L27/34

CPC分类号： H04J13/00 ,  H04B1/707 ,  H04L1/08 ,  H04L27/3427 ,  H04J13/0022 ,  H04J13/004

摘要： An improved system and method for communicating information at variable data rates over in-phase (I) and quadrature phase (Q) communication channels in a CDMA spread spectrum communication system is disclosed herein. In an exemplary implementation an input information signal is transmitted over either an I or Q communication channel using a direct sequence spread spectrum communication signal. The information signal is initially divided into first and second subsignals, which are respectively provided to first and second coset-encoding networks. The first coset-encoding combines the first subsignal with a first coset code, while the second coset-encoding network combines the second subsignal with a second coset code orthogonal to the first coset code. In this way the first and second coset-encoding networks are operative to produce first and second coset-encoded signals, respectively. A composite coset-encoded signal formed from the first and second coset-encoded signals is then modulated by an orthogonal function signal to provide a first modulated signal. In-phase pseudorandom noise (PN.sub.I) and quadrature phase pseudorandom noise (PN.sub.Q) signals of predetermined PN codes are used for spreading the first modulated signal for transmission to a receiver over either the I or Q communication channel, respectively. The receiver is operative to produce an estimate of the input information signal on the basis of the modulated carrier signal received over either the I or Q communication channel.

摘要翻译： 本文公开了一种用于在CDMA扩频通信系统中的同相（I）和正交相位（Q）通信信道上以可变数据速率传送信息的改进的系统和方法。 在示例性实施方式中，使用直接序列扩频通信信号通过I或Q通信信道发送输入信息信号。 信息信号最初分为第一和第二子信号，分别提供给第一和第二陪集编码网络。 第一陪集编码将第一子信号与第一陪集编码组合，而第二陪集编码网络将第二子信号与与第一陪集码正交的第二陪集编码组合。 以这种方式，第一和第二陪集编码网络分别用于产生第一和第二陪集编码的信号。 然后由第一和第二陪集编码信号形成的复合陪集编码信号由正交函数信号调制以提供第一调制信号。 使用预定PN码的同相伪随机噪声（PNI）和正交相位伪随机噪声（PNQ）信号来分别扩展第一调制信号以在I或Q通信信道上传输到接收机。 接收机可操作以基于通过I或Q通信信道接收的调制载波信号来产生输入信息信号的估计。

公开(公告)号：US5469452A

公开(公告)日：1995-11-21

申请号：US767167

申请日：1991-09-27

申请人： Ephraim Zehavi

发明人： Ephraim Zehavi

IPC分类号： H03M13/25 ,  H03M13/41 ,  H04L1/00 ,  H04L27/18 ,  H04L27/233 ,  G06F11/10

CPC分类号： H03M13/256 ,  H03M13/25 ,  H03M13/3776 ,  H03M13/41 ,  H04L1/0054 ,  H04L27/186 ,  H04L27/2332

摘要： A decoder for decoding trellis coded data in which the received signal is assigned a sector value corresponding to the phase of the signal in accordance with a predetermined signal space sectorization format. A Viterbi decoder is used to reconstruct from the received signal an estimate of a data bit that was coded for transmission. This estimate is re-encoded and provided to a trellis output mapper along with the sector value. The trellis mapper in response to the input re-encoded estimate and sector value provides an estimate of an an uncoded data bit transmitted with the coded data bit.

摘要翻译： 解码器，用于对网格编码数据进行解码，其中根据预定的信号空间扇区格式，分配接收到的信号对应于信号的相位的扇区值。 维特比解码器用于从接收信号重建被编码用于传输的数据比特的估计。 该估计被重新编码并提供给网格输出映射器以及扇区值。 响应于输入的重新编码的估计和扇区值，网格映射器提供用编码数据位传输的未编码数据位的估计。

公开(公告)号：US08891663B2

公开(公告)日：2014-11-18

申请号：US10941698

申请日：2004-09-14

申请人： Ephraim Zehavi

发明人： Ephraim Zehavi

IPC分类号： H04L27/00 ,  H04L23/00 ,  H04W28/18 ,  H04L1/00 ,  H04W28/22 ,  H04W72/08 ,  H04W72/04 ,  H04W84/04 ,  H04W24/00

CPC分类号： H04W28/22 ,  H04L1/0003 ,  H04L1/0009 ,  H04L1/0026 ,  H04L1/0072 ,  H04W24/00 ,  H04W28/18 ,  H04W72/0473 ,  H04W72/08 ,  H04W84/042 ,  Y02D70/00

摘要： A method and apparatus for transmitting digital data in a cellular environment. Adjacent cells of the cellular system are prevented from simultaneously transmitting data. Because the noise from transmissions of adjacent cells is a primary source of interference, the transmission rate of power limited base stations can be dramatically increased when the noise from adjacent cells is eliminated. The transmissions to each subscriber station are made at a fixed transmission power level. However, the data rate of transmitted signals differs from one subscriber station to another depending the path loss differences. In a first exemplary embodiment, the data rate of transmissions to a subscriber station is determined by selecting an encoding rate for the transmitted signal while holding the symbol rate constant. In a second exemplary embodiment, the data rate of transmissions to a subscriber station is determined by selection a modulation format for the transmitted signal which directly changes the symbol rate of transmission to a subscriber station.

摘要翻译： 一种用于在蜂窝环境中发送数字数据的方法和装置。 防止蜂窝系统的相邻小区同时发送数据。 由于来自相邻小区的传输的噪声是主要的干扰源，当消除来自相邻小区的噪声时，功率受限基站的传输速率可以显着增加。 向每个用户站的传输是以固定的传输功率级别进行的。 然而，传输信号的数据速率根据路径损耗差异而不同于一个用户站到另一个用户站。 在第一示例性实施例中，通过在保持符号率恒定的同时选择发送信号的编码率来确定向订户站的传输的数据速率。 在第二示例性实施例中，通过选择用于直接将符号传输速率改变到订户站的发送信号的调制格式来确定向订户站的传输的数据速率。

公开(公告)号：US08538322B1

公开(公告)日：2013-09-17

申请号：US09027992

申请日：1998-02-23

申请人： Franklin P. Antonio ,  Ilan Kessler ,  Ze'ev Roth ,  Ephraim Zehavi

发明人： Franklin P. Antonio ,  Ilan Kessler ,  Ze'ev Roth ,  Ephraim Zehavi

IPC分类号： H04H20/74

CPC分类号： H04W24/04 ,  H04B7/18517 ,  H04W52/04

摘要： A system for performing transmit power and admission control for a satellite based wireless communication systems. Admission control uses centralized admission and distributed admission controls. Centralized admission control uses a maximum persistence value broadcasted from a hub to terminals. Persistence is the probability that a transmission will timely occur. Each terminal transmits a persistence that is no greater than the maximum persistence value. If the transmission fails, the transmission is repeated using the same probability. Lowering the persistence introduces a delay for alleviating congestion. Power control is performed using centralized and distributed power control. Centralized power control uses power control commands transmitted from the hub to each terminal. When an acknowledge is not received, a backoff and recovery procedure is performed. Distributed power control is performed during the recovery process when a terminal fails to receive an acknowledgment message after a predetermined number of attempts.

摘要翻译： 一种用于执行基于卫星的无线通信系统的发射功率和准入控制的系统。 录取控制使用集中录取和分发准入控制。 集中接纳控制使用从中心到终端广播的最大持续值。 持久性是传播及时发生的概率。 每个终端发送不大于最大持续值的持久性。 如果传输失败，则以相同的概率重复传输。 降低持久性引发了缓解拥塞的延迟。 使用集中式和分布式电源控制进行功率控制。 集中式功率控制使用从集线器传输到每个终端的功率控制命令。 当不接收到确认时，执行退避和恢复过程。 当在预定次数的尝试之后终端未能接收到确认消息时，在恢复过程中执行分布式功率控制。

公开(公告)号：US08085865B2

公开(公告)日：2011-12-27

申请号：US10269566

申请日：2002-10-11

申请人： Ephraim Zehavi

发明人： Ephraim Zehavi

IPC分类号： H04L27/04 ,  H04L23/00

CPC分类号： H04W28/22 ,  H04L1/0003 ,  H04L1/0009 ,  H04L1/0026 ,  H04L1/0072 ,  H04W24/00 ,  H04W28/18 ,  H04W72/0473 ,  H04W72/08 ,  H04W84/042 ,  Y02D70/00

摘要： A method and apparatus for transmitting digital data in a cellular environment. Adjacent cells of the cellular system are prevented from simultaneously transmitting data. Because the noise from transmissions of adjacent cells is a primary source of interference, the transmission rate of power limited base stations can be dramatically increased when the noise from adjacent cells is eliminated. The transmissions to each subscriber station are made at a fixed transmission power level. However, the data rate of transmitted signals differs from one subscriber station to another depending the path loss differences. In a first exemplary embodiment, the data rate of transmissions to a subscriber station is determined by selecting an encoding rate for the transmitted signal while holding the symbol rate constant. In a second exemplary embodiment, the data rate of transmissions to a subscriber station is determined by selection a modulation format for the transmitted signal which directly changes the symbol rate of transmission to a subscriber station.

公开(公告)号：US07949066B2

公开(公告)日：2011-05-24

申请号：US10109790

申请日：2002-03-29

申请人： Ephraim Zehavi

发明人： Ephraim Zehavi

IPC分类号： H04L27/04

CPC分类号： H04W28/22 ,  H04L1/0003 ,  H04L1/0009 ,  H04L1/0026 ,  H04L1/0072 ,  H04W24/00 ,  H04W28/18 ,  H04W72/0473 ,  H04W72/08 ,  H04W84/042 ,  Y02D70/00

摘要： A method and apparatus for transmitting digital data in a cellular environment. Adjacent cells of the cellular system are prevented from simultaneously transmitting data. Because the noise from transmissions of adjacent cells is a primary source of interference, the transmission rate of power limited base stations can be dramatically increased when the noise from adjacent cells is eliminated. The transmissions to each subscriber station are made at a fixed transmission power level. However, the data rate of transmitted signals differs from one subscriber station to another depending the path loss differences. In a first exemplary embodiment, the data rate of transmissions to a subscriber station is determined by selecting an encoding rate for the transmitted signal while holding the symbol rate constant. In a second exemplary embodiment, the data rate of transmissions to a subscriber station is determined by selection a modulation format for the transmitted signal which directly changes the symbol rate of transmission to a subscriber station.

摘要翻译： 一种用于在蜂窝环境中发送数字数据的方法和装置。 防止蜂窝系统的相邻小区同时发送数据。 由于来自相邻小区的传输的噪声是主要的干扰源，当消除来自相邻小区的噪声时，功率受限基站的传输速率可以显着增加。 向每个用户站的传输是以固定的传输功率级别进行的。 然而，传输信号的数据速率根据路径损耗差异而不同于一个用户站到另一个用户站。 在第一示例性实施例中，通过在保持符号率恒定的同时选择发送信号的编码率来确定向订户站的传输的数据速率。 在第二示例性实施例中，通过选择用于直接将符号传输速率改变到订户站的发送信号的调制格式来确定向订户站的传输的数据速率。