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    Method and apparatus for generating multiple bits of a pseudonoise sequence with each clock pulse by computing the bits in parallel
    1.
    发明授权
    Method and apparatus for generating multiple bits of a pseudonoise sequence with each clock pulse by computing the bits in parallel 有权
    用于通过并行计算比特来产生具有每个时钟脉冲的伪噪声序列的多个比特的方法和装置

    公开(公告)号：US06640236B1

    公开(公告)日：2003-10-28

    申请号：US09386600

    申请日：1999-08-31

    申请人： Edward O. Lupin ,  Nagabhushana T. Sindhushayana

    发明人： Edward O. Lupin ,  Nagabhushana T. Sindhushayana

    IPC分类号： G06F102

    CPC分类号： G06F7/584

    摘要： The invention presented is a novel method and apparatus for generating PN sequences with an arbitrary number of bits, where the number of bits is provided in parallel with each clock pulse. This allows the sequences to be generated at high speed when needed, and allows parallel processing in the acquisition and demodulation processes. In the invention, the initial values of states are loaded into registers of a parallel PN generator, which immediately generates the next n bits of the PN sequence, where n is an arbitrary number dependent on performance required. Then, a first sub-part of the PN generator of the present invention receives the present state of the PN generator and outputs the state of the PN generator n bits in the future. The output of this first sub-part is then provided to a second sub-part of the generator, which generates the next n bits of the PN sequence. In this fashion, the entire PN sequence can be continuously generated. The PN generator also contains a control processor, coordinating co-operation between sub-systems.

    摘要翻译： 所提出的本发明是用于产生具有任意位数的PN序列的新颖方法和装置，其中与每个时钟脉冲并联提供比特数。 这允许在需要时以高速生成序列，并且允许在采集和解调过程中的并行处理。 在本发明中，将状态的初始值加载到并行PN发生器的寄存器中，其立即生成PN序列的下一个n位，其中n是取决于所需性能的任意数目。 然后，本发明的PN发生器的第一子部分接收PN发生器的当前状态，并在将来输出PN发生器n位的状态。 然后将该第一子部分的输出提供给发生器的第二子部分，其产生PN序列的下一个n位。 以这种方式，可以连续地产生整个PN序列。 PN发生器还包含一个控制处理器，协调子系统之间的协作。

    Method and apparatus for a rate control in a high data rate communication system
    4.
    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。

    Pilot reference transmission for a wireless communication system
    5.
    发明授权
    Pilot reference transmission for a wireless communication system 有权
    无线通信系统的导频参考传输

    公开(公告)号：US07289473B1

    公开(公告)日：2007-10-30

    申请号：US09702142

    申请日：2000-10-30

    申请人： Roberto Padovani ,  Peter J. Black ,  Nagabhushana T. Sindhushayana

    发明人： Roberto Padovani ,  Peter J. Black ,  Nagabhushana T. Sindhushayana

    IPC分类号： H04Q7/00 ,  H04J3/06

    CPC分类号： H04B1/707 ,  H04B2201/70701

    摘要： A pilot reference transmission scheme well suited for high data rate wireless communication systems is disclosed. To maximize the amount of interference from transmissions from neighboring transmission sources (e.g., access points or base stations) during the pilot interval, and hence minimize the amount of interference from non-transmitting sources during the data intervals, the pilot references are transmitted in bursts at predetermined time intervals, and the pilot bursts from the access points are synchronized. This results in maximum interference contributions from non-transmitting neighboring access points, facilitating reliable estimation of worst case carrier-to-interference (C/I), and further allows the receiving devices (e.g., access terminals) to easily recognize the bursts as pilot reference. In one embodiment, each access point transmits the pilot bursts at or near its maximum transmit power level and no user-specific data is transmitted during the pilot bursts.

    摘要翻译： 公开了一种非常适合高数据速率无线通信系统的导频参考传输方案。 为了在导频间隔期间使来自相邻传输源（例如，接入点或基站）的传输的干扰量最大化，并且因此在数据间隔期间最小化来自非发射源的干扰量，导频参考以突发 并且来自接入点的导频突发是同步的。 这导致来自非发射相邻接入点的最大干扰贡献，促进对最差情况下的载波干扰（C / I）的可靠估计，并且还允许接收设备（例如，接入终端）容易地将突发识别为导频 参考。 在一个实施例中，每个接入点在其最大发射功率电平处或其附近发射导频脉冲串，并且在导频突发期间不发送用户特定数据。

    System and method for performing accurate demodulation of turbo-encoded signals via pilot assisted coherent demodulation
    7.
    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.

    Pilot reference transmission for a wireless communication system
    9.
    发明授权
    Pilot reference transmission for a wireless communication system 有权
    无线通信系统的导频参考传输

    公开(公告)号：US09118387B2

    公开(公告)日：2015-08-25

    申请号：US11858840

    申请日：2007-09-20

    申请人： Roberto Padovani ,  Peter J. Black ,  Nagabhushana T. Sindhushayana

    发明人： Roberto Padovani ,  Peter J. Black ,  Nagabhushana T. Sindhushayana

    IPC分类号： H04L12/28 ,  H04B7/26 ,  H04B1/707 ,  H04W52/32 ,  H04J1/16 ,  H04J3/06

    CPC分类号： H04B7/2687 ,  H04B1/707 ,  H04B2201/70701 ,  H04J3/0644 ,  H04W52/325

    摘要： A pilot reference transmission scheme well suited for high data rate wireless communication systems is disclosed. To maximize the amount of interference from transmissions from neighboring transmission sources (e.g., access points or base stations) during the pilot interval, and hence minimize the amount of interference from non-transmitting sources during the data intervals, the pilot references are transmitted in bursts at predetermined time intervals, and the pilot bursts from the access points are synchronized. This results in maximum interference contributions from non-transmitting neighboring access points, facilitating reliable estimation of worst case carrier-to-interference (C/I), and further allows the receiving devices (e.g., access terminals) to easily recognize the bursts as pilot reference. In one embodiment, each access point transmits the pilot bursts at or near its maximum transmit power level and no user-specific data is transmitted during the pilot bursts.

    摘要翻译： 公开了一种非常适合高数据速率无线通信系统的导频参考传输方案。 为了在导频间隔期间使来自相邻传输源（例如，接入点或基站）的传输的干扰量最大化，并且因此在数据间隔期间最小化来自非发射源的干扰量，导频参考以突发 并且来自接入点的导频突发是同步的。 这导致来自非发射相邻接入点的最大干扰贡献，促进对最差情况下的载波干扰（C / I）的可靠估计，并且还允许接收设备（例如，接入终端）容易地将突发识别为导频 参考。 在一个实施例中，每个接入点在其最大发射功率电平处或其附近发射导频脉冲串，并且在导频突发期间不发送用户特定数据。