公开(公告)号：US20070178927A1

公开(公告)日：2007-08-02

申请号：US11441651

申请日：2006-05-25

申请人： Ivan Fernandez-Corbaton ,  Ahmad Jalali ,  Jordi Pinos Pont

发明人： Ivan Fernandez-Corbaton ,  Ahmad Jalali ,  Jordi Pinos Pont

IPC分类号： H04B7/00 ,  H04Q7/20

CPC分类号： H04W52/343 ,  H04W52/367

摘要： A novel MAC algorithm is disclosed having various features for a modern CDMA interference-shared reverse link, including (a) link quality assurance, (b) individual congestion control, (c) variable data rate transition policy, and/or (d) reverse link partitioning. Link quality assurance is provided by monitoring transmission feedback information (ACK/NACK) to indirectly determine the quality of a communication link. Wireless devices are individually targeted to perform congestion control of the reverse link. Variable data transmission rates and discontinuous transmissions are achieved by individual wireless devices that autonomously adjust their transmission rate and transmit power. The reverse link can also be partitioned among the different wireless devices by individually controlling the transmit power of the wireless devices operating on the reverse link.

摘要翻译： 公开了一种新颖的MAC算法，其具有用于现代CDMA干扰共享反向链路的各种特征，包括（a）链路质量保证，（b）个体拥塞控制，（c）可变数据速率转换策略和/或（d）反向 链接分区。 通过监视传输反馈信息（ACK / NACK）来间接地确定通信链路的质量来提供链路质量保证。 无线设备被单独定向以执行反向链路的拥塞控制。 可变数据传输速率和不连续传输通过自主调整其传输速率和传输功率的各个无线设备实现。 也可以通过单独控制在反向链路上操作的无线设备的发射功率，在不同的无线设备之间对反向链路进行分区。

公开(公告)号：US20070083803A1

公开(公告)日：2007-04-12

申请号：US11249293

申请日：2005-10-12

申请人： Pei Chen ,  Ahmad Jalali

发明人： Pei Chen ,  Ahmad Jalali

IPC分类号： H03M13/00

CPC分类号： H03M13/2789 ,  H03M13/271 ,  H03M13/276 ,  H03M13/2771 ,  H03M13/2957

摘要： At least one aspect of the invention provides a turbo encoder having parallel first and second constituent encoders and an interleaver coupled as an input to the second constituent encoder to provide a permutated version of the binary data input to the first constituent encoder to achieve a low frame error rate. The interleaver is configured to parse the binary data input into an input block, determine a permutation vector, and rearrange the order of the binary data in the input block according to a set of predetermined permutation equations. The rearranged binary data in the information block is then passed to the second constituent encoder to improve the distance spectrum of the transmitted redundant data.

摘要翻译： 本发明的至少一个方面提供了一种具有并行的第一和第二组成编码器的turbo编码器和作为第二组成编码器的输入的交织器，以提供输入到第一组成编码器的二进制数据的置换版本以实现低帧 错误率。 交织器被配置为将输入的二进制数据解析成输入块，确定置换向量，并且根据一组预定的置换方程重新排列输入块中的二进制数据的顺序。 然后将信息块中的重新排列的二进制数据传递给第二组成编码器，以改进发送的冗余数据的距离谱。

公开(公告)号：US07127654B2

公开(公告)日：2006-10-24

申请号：US10712582

申请日：2003-11-12

申请人： Ahmad Jalali ,  Eduardo A. S. Esteves ,  Nagabhushana T. Sindhushayana ,  Peter J. Black ,  Rashid A. Attar

发明人： Ahmad Jalali ,  Eduardo A. S. Esteves ,  Nagabhushana T. Sindhushayana ,  Peter J. Black ,  Rashid A. Attar

IPC分类号： G08C25/02 ,  H04J3/24 ,  H04L7/00

CPC分类号： H04L1/1887 ,  H04L1/1692 ,  H04L1/1809 ,  H04L1/1848 ,  H04L1/1877 ,  H04L1/188

摘要： A method and an apparatus for quick retransmission of signals in a communication system are disclosed. A transmitting terminal, e.g., a base station, transmits signals in a form of packets to a receiving terminal, e.g., a subscriber station. The receiving terminal determines if the packet was intended for the receiving terminal, and if so, the receiving terminal demodulates the packet. The receiving terminal then computes a quality metric of the packet, and compares the computed quality metric with a quality metric contained in the packet. If the quality metrics match, the packet is declared correctly received, and is forwarded for further processing. If the quality metrics fail to match, the receiving terminal sends a request for retransmission of the packet. The transmitting terminal determines which packet needs to be retransmitted based on the request for retransmission. The transmitting terminal then schedules the packet for retransmission.

公开(公告)号：US20060109926A1

公开(公告)日：2006-05-25

申请号：US11328807

申请日：2006-01-09

申请人： Ahmad Jalali ,  John Smee ,  Mark Wallace

发明人： Ahmad Jalali ,  John Smee ,  Mark Wallace

IPC分类号： H04K1/10 ,  H04B7/212 ,  H04L1/02

CPC分类号： H04L1/0032 ,  H04B7/0434 ,  H04B7/0626 ,  H04L1/0003 ,  H04L1/0013 ,  H04L1/0026 ,  H04L1/0034 ,  H04L1/06 ,  H04L5/0023 ,  H04L25/0204 ,  H04L25/0224 ,  H04L25/0226 ,  H04L25/03343 ,  H04L27/2647 ,  H04L2025/03414 ,  H04L2025/03426

摘要： Techniques to process data for transmission in a time division duplexed (TDD) communication system. In one aspect, the frequency response of a forward link is estimated at a base station based on reverse link transmissions (e.g., pilots) from a terminal. Prior to a data transmission on the forward link, the base station determines a reverse transfer function based on the pilots transmitted by the terminal, “calibrates” the reverse transfer function with a calibration function to derive an estimate of a forward transfer function, and preconditions modulation symbols based on weights derived from the forward transfer function. In another aspect, the terminal estimates the “quality” of the forward link and provides this information to the base station. The base station then uses the information to properly code and modulate data prior to transmission such that the transmitted data can be received by the terminal at the desired level of performance.

公开(公告)号：US07027523B2

公开(公告)日：2006-04-11

申请号：US09887225

申请日：2001-06-22

申请人： Ahmad Jalali ,  John E. Smee ,  Mark Wallace

发明人： Ahmad Jalali ,  John E. Smee ,  Mark Wallace

IPC分类号： H04L25/03

CPC分类号： H04L1/0032 ,  H04B7/0434 ,  H04B7/0626 ,  H04L1/0003 ,  H04L1/0013 ,  H04L1/0026 ,  H04L1/0034 ,  H04L1/06 ,  H04L5/0023 ,  H04L25/0204 ,  H04L25/0224 ,  H04L25/0226 ,  H04L25/03343 ,  H04L27/2647 ,  H04L2025/03414 ,  H04L2025/03426

摘要： Techniques to process data for transmission in a time division duplexed (TDD) communication system. In one aspect, the frequency response of a forward link is estimated at a base station based on reverse link transmissions (e.g., pilots) from a terminal. Prior to a data transmission on the forward link, the base station determines a reverse transfer function based on the pilots transmitted by the terminal, “calibrates” the reverse transfer function with a calibration function to derive an estimate of a forward transfer function, and preconditions modulation symbols based on weights derived from the forward transfer function. In another aspect, the terminal estimates the “quality” of the forward link and provides this information to the base station. The base station then uses the information to properly code and modulate data prior to transmission such that the transmitted data can be received by the terminal at the desired level of performance.

公开(公告)号：US20050270999A1

公开(公告)日：2005-12-08

申请号：US10860883

申请日：2004-06-03

申请人： Leonard Schiff ,  Ahmad Jalali ,  Wei Shi

发明人： Leonard Schiff ,  Ahmad Jalali ,  Wei Shi

IPC分类号： H04B7/185

CPC分类号： H04B7/18513 ,  H04B7/18543

摘要： Methods and apparatus are disclosed to provide orthogonal multiple access communication in a return link of a satellite communication system. In one embodiment, a closed loop control of a transmit parameter associated with transmission of signals may be performed. In addition, changes in motion of a terminal are monitored such that an open loop control of the transmit parameter is performed, if the detected change meets a certain threshold. For example, an open control is performed if an abrupt or sudden motion is detected.

摘要翻译： 公开了在卫星通信系统的返回链路中提供正交多址通信的方法和装置。 在一个实施例中，可以执行与信号传输相关联的传输参数的闭环控制。 此外，如果检测到的变化满足一定阈值，则监视终端的运动变化，使得执行发​​送参数的开环控制。 例如，如果检测到突然或突然的运动，则执行打开控制。

公开(公告)号：US06522683B1

公开(公告)日：2003-02-18

申请号：US09636008

申请日：2000-08-10

申请人： John E. Smee ,  Ahmad Jalali ,  Fuyun Ling ,  Mark Wallace

发明人： John E. Smee ,  Ahmad Jalali ,  Fuyun Ling ,  Mark Wallace

IPC分类号： H04B169

CPC分类号： H04B1/7097 ,  H04L25/03038 ,  H04L2025/03375 ,  H04L2025/03477

摘要： A receive filter receives signals from a communication channel. The received signals correspond to original Walsh covered chip sequences transmitted by a transmit filter through the communication channel to the receive filter. The received signals are processed by an equalizer to generate a soft estimate of chip sequences corresponding to the original Walsh covered chip sequences. An N chip Walsh decover is then utilized to generate a soft estimate of code symbols corresponding to the soft estimate of the chip sequences. A number of symbol slicers are then used in parallel to produce a hard estimate of the code symbols corresponding to the soft estimate of code symbols generated by the N chip Walsh decover. Thereafter an N chip Walsh cover is used as part of a scheme to generate a hard estimate of chip sequences corresponding to the hard estimate of the code symbols generated by the symbol slicers. The hard estimate of the chip sequences generated with the aid of the N chip Walsh cover, and the soft estimate of the chip sequences generated by the equalizer, are used to generate a tracking mode error signal to adapt the response of the equalizer to the received signals.

公开(公告)号：US06233439B1

公开(公告)日：2001-05-15

申请号：US09128061

申请日：1998-08-03

申请人： Ahmad Jalali

发明人： Ahmad Jalali

IPC分类号： H01Q1112

CPC分类号： H01Q1/246 ,  H01Q11/12

摘要： The Eb/No estimation process generates two streams of power control bits that are transmitted to the base station. One of the power control bit streams is generated under the assumption that the frame rate has not changed. The other power control bit stream is generated under the assumption that the frame rate has changed. The base station, knowing whether or not the frame rate changed, chooses the appropriate stream to use in controlling the base station transmit power.

摘要翻译： Eb / No估计过程产生两个发送到基站的功率控制位流。 在帧速率没有改变的假设下产生功率控制比特流之一。 在帧速率已经改变的假设下产生另一个功率控制比特流。 基站知道帧速率是否改变，选择用于控制基站发射功率的适当流。

公开(公告)号：US6154659A

公开(公告)日：2000-11-28

申请号：US998340

申请日：1997-12-24

申请人： Ahmad Jalali ,  Leo Strawczynski

发明人： Ahmad Jalali ,  Leo Strawczynski

IPC分类号： H04B7/005 ,  H04Q7/00

CPC分类号： H04W52/24 ,  H04W52/12 ,  H04W52/225

摘要： The radiotelephone demodulates the information received from the base station. The symbol-energy-to-noise-density (E.sub.s /N.sub.o) is estimated over a specified duration. This estimate is compared to a target E.sub.s /N.sub.o value. The target is updated periodically in order to maintain the quality of service. If the measured E.sub.s /N.sub.o is greater than the target, the radiotelephone sends a power down command over a reverse power control signaling channel to the base station. If the measured E.sub.s /N.sub.o is less than the target, the radiotelephone sends a power up command to the base station over the same channel. A multi-carrier transceiver system for a code division multiple access system includes circuitry for up-converting processed user data to a plurality of frequency channels. The transceiver, in some embodiments, further includes a plurality of antennas for transmitting each channel of user data. A method of using the multi-carrier system includes processing user data, and then transmitting the data at different frequency channels, and when necessary, transmitting the data through different antennas separated in space and/or having orthogonal polarization.

摘要翻译： 无线电话机解调从基站接收的信息。 在特定持续时间内估计符号 - 能量噪声密度（Es / No）。 将该估计与目标Es / No值进行比较。 定期更新目标，以保持服务质量。 如果测量的Es / No大于目标，则无线电话机通过反向功率控制信令信道向基站发送掉电命令。 如果测量的Es / No小于目标，则无线电话机通过相同的信道向基站发送加电命令。 用于码分多址系统的多载波收发机系统包括用于将经处理的用户数据上转换为多个频率信道的电路。 在一些实施例中，收发器还包括用于发送用户数据的每个通道的多个天线。 使用多载波系统的方法包括处理用户数据，然后在不同频率信道上发送数据，并且在必要时，通过在空间中分离的和/或具有正交极化的不同天线发送数据。

公开(公告)号：US6097712A

公开(公告)日：2000-08-01

申请号：US879773

申请日：1997-06-20

申请人： Norman P. Secord ,  Leo Strawczynski ,  Alberto Gutierrez ,  Ahmad Jalali

发明人： Norman P. Secord ,  Leo Strawczynski ,  Alberto Gutierrez ,  Ahmad Jalali

IPC分类号： H04L5/02 ,  H04B7/216 ,  H04L27/30

CPC分类号： H04L5/026

摘要： In a receiver of a simulcast multi-carrier CDMA (code division multiple access) communications system, a combined data signal is produced by combining signals representing data received for the plurality of carriers and is multiplied by the complex conjugate of a composite reference signal, representing characteristics of the plurality of carriers, produced by combining signals representing a reference signal received for the plurality of carriers, thereby improving multi-path resolution due to frequency diversity of the reference signal over the multiple carriers of the system. The receiver can be simplified by demodulating the signals of the plurality of carriers in common to produce a demodulated signal which is common to the data and reference signals for the plurality of carriers, the data and reference signals being subsequently separated using their respective orthogonal codes. Data signals can be recovered both with and without the improved multi-path resolution over the multiple carriers, and an optimum selection between them can be made.

摘要翻译： 在联播多载波CDMA（码分多址）通信系统的接收机中，组合数据信号通过组合表示针对多个载波接收的数据的信号产生，并且乘以复合参考信号的复共轭，代表 通过组合表示为多个载波接收的参考信号的信号而产生的多个载波的特性，从而改善由于参考信号在系统的多个载波上的频率分集而导致的多径分辨率。 可以通过共同解调多个载波的信号来简化接收机，以产生对于多个载波的数据和参考信号共同的解调信号，随后使用它们各自的正交码分离数据和参考信号。 数据信号可以在多载波上具有和不具有改进的多径分辨率的情况下被恢复，并且可以在它们之间进行最佳的选择。