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    System and method for performing accurate demodulation of turbo-encoded signals via pilot assisted coherent demodulation
    1.
    发明授权
    System and method for performing accurate demodulation of turbo-encoded signals via pilot assisted coherent demodulation 有权

    公开(公告)号：US06377607B1

    公开(公告)日：2002-04-23

    申请号：US09311793

    申请日：1999-05-13

    申请人： Fuyun Ling ,  Nagabhushana T. Sindhushayana ,  Eduardo A. S. Esteves

    发明人： Fuyun Ling ,  Nagabhushana T. Sindhushayana ,  Eduardo A. S. Esteves

    IPC分类号： H04B169

    CPC分类号： H03M13/6337 ,  H03M13/2957 ,  H03M13/658 ,  H04L1/20

    摘要： An efficient telecommunications receiver system for accurately decoding a received composite signal having a data signal component and a pilot signal component. The receiver system includes a first circuit for receiving the composite signal and extracting a pilot signal and a data signal from received composite signal. A second circuit calculates a log-likelihood ratio as a function of a channel estimate based on the pilot signal. A third circuit scales the log-likelihood ratio by a predetermined log-likelihood ratio scaling factor and provides an accurate log-likelihood value in response thereto. A fourth circuit decodes the received composite signal based on the accurate log-likelihood value and the data signal. In a specific embodiment, the pilot signal and the data signal comprise pilot samples and data samples, respectively. The third circuit includes a carrier signal-to-interference ratio circuit for computing a first signal-to-interference ratio and a second signal-to-interference ratio based partly on the pilot signal. The first signal-to-interference ratio is based on the data samples, and the second signal-to-interference ratio is based on the pilot samples. The first signal-to-noise ratio and the second signal-to-noise ratio provide input to a circuit for computing the predetermined log-likelihood ratio scaling factor that is included in the third circuit. In a more specific embodiment, the first circuit includes a despreader for despreading the received composite signal in accordance with a predetermined spreading function and providing a despread signal in response thereto. The spreading function is a pseudo noise sequence or a Walsh function. The first circuit further includes a decovering circuit that extracts the pilot signal and the data signal from the despread signal. In the illustrative embodiment, the accurate receiver system further includes a circuit for generating a rate and/or power control message and transmitting the rate and/or power control message to an external transceiver in communication with the efficient receiver system.

    System and method for performing accurate demodulation of turbo-encoded signals via pilot assisted coherent demodulation
    2.
    发明授权
    System and method for performing accurate demodulation of turbo-encoded signals via pilot assisted coherent demodulation 失效
    通过导频辅助相干解调进行turbo编码信号的精确解调的系统和方法

    公开(公告)号：US06975669B2

    公开(公告)日：2005-12-13

    申请号：US10050338

    申请日：2002-01-15

    申请人： Fuyun Ling ,  Nagabhushana T. Sindhushayana ,  Eduardo A. S. Esteves

    发明人： Fuyun Ling ,  Nagabhushana T. Sindhushayana ,  Eduardo A. S. Esteves

    IPC分类号： H03M13/25 ,  H03M13/29 ,  H04L1/20 ,  H04B1/707

    CPC分类号： H03M13/6337 ,  H03M13/2957 ,  H03M13/658 ,  H04L1/20

    摘要： An efficient telecommunications receiver system for accurately decoding a received composite signal having a data signal component and a pilot signal component includes a first circuit for receiving the composite signal and extracting a pilot signal and a data signal from received composite signal. A second circuit calculates a log-likelihood ratio as a function of a channel estimate based on the pilot signal. A third circuit scales the log-likelihood ratio by a predetermined log-likelihood ratio scaling factor and provides an accurate log-likelihood value in response thereto. A fourth circuit decodes the received composite signal based on the accurate log-likelihood value and the data signal. The third circuit includes a carrier signal-to-interference ratio circuit for computing a first signal-to-interference ratio and a second signal-to-interference ratio based partly on the pilot signal.

    摘要翻译： 一种用于对具有数据信号分量和导频信号分量的接收复合信号进行精确解码的有效电信接收机系统包括用于接收复合信号并从接收的复合信号中提取导频信号和数据信号的第一电路。 第二电路基于导频信号计算作为信道估计的函数的对数似然比。 第三电路将对数似然比缩小预定的对数似然比缩放因子，并响应于此提供准确的对数似然值。 第四电路基于准确的对数似然值和数据信号对接收到的复合信号进行解码。 第三电路包括用于基于导频信号计算第一信号干扰比和第二信号干扰比的载波信号干扰比电路。

    Method and apparatus for a rate control in a high data rate communication system
    3.
    发明授权
    Method and apparatus for a rate control in a high data rate communication system 有权
    高数据速率通信系统中速率控制的方法和装置

    公开(公告)号：US07417957B2

    公开(公告)日：2008-08-26

    申请号：US10808939

    申请日：2004-03-24

    申请人： Nagabhushana T. Sindhushayana ,  Rashid A. Attar ,  Eduardo A. S. Esteves

    发明人： Nagabhushana T. Sindhushayana ,  Rashid A. Attar ,  Eduardo A. S. Esteves

    IPC分类号： H04L12/26 ,  H04B7/212

    CPC分类号： H04L1/0021 ,  H04L1/0002 ,  H04L1/0016 ,  H04L1/002 ,  H04L1/0025 ,  Y02D50/10

    摘要： A method and an apparatus for rate control in a high data rate (HDR) communication system are disclosed. An exemplary HDR communication system defines a set of data rates, at which an access point (AP) may send data packets to an access terminal (AT). The data rate is selected to maintain targeted packet error rate (PER). The AT's open loop algorithm measures received signal to interference and noise ratio (SINR) at regular intervals, and uses the information to predict an average SINR over the next packet duration. The AT's closed loop algorithm measures a packet error rate (PER) of the received signal, and uses the PER to calculate a closed loop correction factor. The loop correction factor is added to the SINR value predicted by the open loop, resulting in an adjusted SINR.

    摘要翻译： 公开了一种用于高数据速率（HDR）通信系统中的速率控制的方法和装置。 示例性HDR通信系统定义了一组数据速率，接入点（AP）可在该组数据速率上向接入终端（AT）发送数据分组。 选择数据速率以维持目标分组错误率（PER）。 AT的开环算法以规则的间隔测量接收信号与干扰和噪声比（SINR），并且使用该信息来预测下一个分组持续时间内的平均SINR。 AT的闭环算法测量接收信号的分组错误率（PER），并使用PER计算闭环校正因子。 循环校正因子加到由开环预测的SINR值，得到调整后的SINR。

    Method and apparatus for adaptive rate selection in a communication system
    5.
    发明授权
    Method and apparatus for adaptive rate selection in a communication system 失效
    通信系统中自适应速率选择的方法和装置

    公开(公告)号：US07440431B2

    公开(公告)日：2008-10-21

    申请号：US10834605

    申请日：2004-04-28

    申请人： Nagabhushana T. Sindhushayana ,  Eduardo A. S. Esteves ,  Rashid A. Attar ,  Qiang Wu

    发明人： Nagabhushana T. Sindhushayana ,  Eduardo A. S. Esteves ,  Rashid A. Attar ,  Qiang Wu

    IPC分类号： H04Q7/00

    CPC分类号： H04L1/0002

    摘要： A method and an apparatus for adaptive data rate selection in a high data rate (HDR) communication system are disclosed. An exemplary HDR communication system defines a set of data rates, at which an access point (AP) may transmit data packets to an access terminal (AT). The transmission data rate is selected to maintain target packet error rate (PER). Each AT monitors signal quality metric of signals received from APs. An AT receiving forward link signals from multiple ATs identifies the AT associated with the highest quality forward link signal.

    摘要翻译： 公开了一种在高数据速率（HDR）通信系统中进行自适应数据速率选择的方法和装置。 示例性HDR通信系统定义了一组数据速率，接入点（AP）可在该组数据速率上向接入终端（AT）发送数据分组。 选择传输数据速率以维持目标分组错误率（PER）。 每个AT监视从AP接收的信号的信号质量度量。 从多个AT接收前向链路信号的AT识别与最高质量的前向链路信号相关联的AT。

    Method and apparatus for a rate control in a high data rate communication system
    7.
    发明授权
    Method and apparatus for a rate control in a high data rate communication system 有权
    高数据速率通信系统中速率控制的方法和装置

    公开(公告)号：US06751199B1

    公开(公告)日：2004-06-15

    申请号：US09556769

    申请日：2000-04-24

    申请人： Nagabhushana T. Sindhushayana ,  Rashid A. Attar ,  Eduardo A. S. Esteves

    发明人： Nagabhushana T. Sindhushayana ,  Rashid A. Attar ,  Eduardo A. S. Esteves

    IPC分类号： H04L1226

    CPC分类号： H04L1/0021 ,  H04L1/0002 ,  H04L1/0016 ,  H04L1/002 ,  H04L1/0025 ,  Y02D50/10

    摘要： A method and an apparatus for rate control in a high data rate (HDR) communication system are disclosed. An exemplary HDR communication system defines a set of data rates, at which an access point (AP) may send data packets to an access terminal (AT). The data rate is selected to maintain targeted packet error rate (PER). The AT's open loop algorithm measures received signal to interference and noise ratio (SINR) at regular intervals, and uses the information to predict an average SINR over the next packet duration. The AT's closed loop algorithm measures a packet error rate (PER) of the received signal, and uses the PER to calculate a closed loop correction factor. The loop correction factor is added to the SINR value predicted by the open loop, resulting in an adjusted SINR. The AT maintains a look up table, which comprises a set of SINR thresholds that represent a minimum SINR necessary to successfully decode a packet at each data rate. The AT uses the adjusted set of SINR thresholds in the look up table to select the highest data rate, the SINR threshold of which is below the predicted SINR. The AT then requests, over the reverse link, that the AP send the next packet at this data-rate.

    摘要翻译： 公开了一种用于高数据速率（HDR）通信系统中的速率控制的方法和装置。 示例性HDR通信系统定义了一组数据速率，接入点（AP）可在该组数据速率上向接入终端（AT）发送数据分组。 选择数据速率以维持目标分组错误率（PER）。 AT的开环算法以规则的间隔测量接收信号与干扰和噪声比（SINR），并且使用该信息来预测下一个分组持续时间内的平均SINR。 AT的闭环算法测量接收信号的分组错误率（PER），并使用PER计算闭环校正因子。 循环校正因子加到由开环预测的SINR值，得到调整后的SINR。 AT维护查找表，其包括一组SINR阈值，其表示在每个数据速率下成功解码分组所需的最小SINR。 AT在查找表中使用调整后的SINR阈值组来选择SINR阈值低于预测SINR的最高数据速率。 AT然后通过反向链路请求AP以该数据速率发送下一个分组。

    Method and apparatus for variable and fixed forward link rate control in a mobile radio communications system
    8.
    发明授权
    Method and apparatus for variable and fixed forward link rate control in a mobile radio communications system 有权
    用于移动无线电通信系统中可变和固定的前向链路速率控制的方法和装置

    公开(公告)号：US06205129B1

    公开(公告)日：2001-03-20

    申请号：US09231743

    申请日：1999-01-15

    申请人： Eduardo A. S. Esteves ,  Rajesh Pankaj ,  Peter J. Black ,  Matthew S. Grob ,  Nagabhushana T. Sindhushayana

    发明人： Eduardo A. S. Esteves ,  Rajesh Pankaj ,  Peter J. Black ,  Matthew S. Grob ,  Nagabhushana T. Sindhushayana

    IPC分类号： H04B7212

    CPC分类号： H04W28/22 ,  H04L1/0002 ,  H04L1/0036 ,  H04L2001/0092 ,  H04W36/18

    摘要： A method and apparatus for controlling a data rate associated with the transmission of information from a base station to a mobile station in a mobile radio communication system. The mobile station alternately receives information from a base station either in a variable rate mode or a fixed rate mode. The transmission rate from a base station in the variable rate mode varies between successive data transmit intervals, and the transmission rate from a base station in the fixed rate mode remains fixed between successive data transmit intervals. Data is transmitted from a first base station to the mobile station in the variable rate mode until the first base station is unable to receive variable data rate control information from the mobile station. When the first base station is unable to receive the variable data rate control information from the mobile station, the mobile station attempts to remain in the variable rate mode by searching for a second base station that will support data transmissions to the mobile station in the variable rate mode and, if the mobile station is able to locate the second base station that will support data transmissions to the mobile station in the variable rate mode, then the second base station transmits data to the mobile station in the variable rate mode and transmissions from the first base station to the mobile station in the variable rate mode terminate. If the mobile station is unable to locate the second base station that will support data transmissions to the mobile station in the variable rate mode, data is transmitted to the mobile station from either the first base station or a different base station in the fixed rate mode.

    摘要翻译： 一种用于在移动无线电通信系统中控制与从基站到移动台的信息传输相关联的数据速率的方法和装置。 移动台以可变速率模式或固定速率模式从基站交替地接收信息。 来自基站的可变速率模式的传输速率在连续的数据发送间隔之间变化，并且来自固定速率模式的基站的传输速率在连续的数据发送间隔之间保持固定。 数据以可变速率模式从第一基站发送到移动台，直到第一基站不能从移动台接收可变数据速率控制信息。 当第一基站不能从移动台接收可变数据速率控制信息时，移动台试图通过搜索将在该变量中支持对移动站的数据传输的第二基站来保持可变速率模式 并且如果移动台能够将能够以可变速率模式支持到移动站的数据传输的第二基站定位，则第二基站以可变速率模式向移动台发送数据，并且从 以可变速率模式移动台的第一个基站终止。 如果移动台不能将可支持以可变速率模式向移动台发送数据的第二基站定位，则以固定速率模式从第一基站或不同基站发送数据到移动台 。