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132 条记录 (耗时 0.03 秒)

    Rate selection for a quasi-orthogonal communication system
    58.
    发明申请
    Rate selection for a quasi-orthogonal communication system 有权
    准正交通信系统的速率选择

    公开(公告)号：US20060234646A1

    公开(公告)日：2006-10-19

    申请号：US11150417

    申请日：2005-06-10

    申请人： Ayman Naguib ,  Alexei Gorokhov ,  Tingfang Ji ,  Dhananjay Gore ,  Arak Sutivong

    发明人： Ayman Naguib ,  Alexei Gorokhov ,  Tingfang Ji ,  Dhananjay Gore ,  Arak Sutivong

    IPC分类号： H04B7/00 ,  H04B1/00

    CPC分类号： H04L1/0019 ,  H04L1/0003 ,  H04L1/0016 ,  H04L1/06 ,  H04L25/0212 ,  H04L25/0228 ,  H04L25/0242 ,  H04L25/0256

    摘要： To select a rate for a transmitter in a communication system, a receiver obtains a channel response estimate and a received SINR estimate for the transmitter, e.g., based on a pilot received from the transmitter. The receiver computes a hypothesized SINR for the transmitter based on the channel response estimate and the received SINR estimate. The receiver then selects a rate for the transmitter based on (1) the hypothesized SINR and (2) characterized statistics of noise and interference at the receiver for the transmitter, which may be given by a probability density function (PDF) of SINR loss with respect to the hypothesized SINR. A look-up table of rate versus hypothesized SINR may be generated a priori for the PDF of SINR loss. The receiver may then apply the hypothesized SINR for the transmitter to the look-up table, which then provides the rate for the transmitter.

    摘要翻译： 为了在通信系统中选择发射机的速率，接收机例如基于从发射机接收到的导频，获得用于发射机的信道响应估计和接收到的SINR估计。 接收机基于信道响应估计和接收的SINR估计来计算发射机的假设SINR。 接收机然后基于（1）假设的SINR和（2）用于发射机的接收机处的噪声和干扰的特征统计来选择发射机的速率，其可以由SINR丢失的概率密度函数（PDF）给出， 尊重假设的SINR。 速率与假设SINR的查找表可能会先于SINR损失的PDF生成。 然后，接收机可以将发射机的假设SINR应用于查找表，然后查找表提供发射机的速率。

    Robust erasure detection and erasure-rate-based closed loop power control
    59.
    发明授权
    Robust erasure detection and erasure-rate-based closed loop power control 有权
    强大的擦除检测和基于擦除率的闭环功率控制

    公开(公告)号：US08516314B2

    公开(公告)日：2013-08-20

    申请号：US13206206

    申请日：2011-08-09

    申请人： Arak Sutivong ,  Avneesh Agrawal ,  David Jonathan Julian

    发明人： Arak Sutivong ,  Avneesh Agrawal ,  David Jonathan Julian

    IPC分类号： G06F11/00

    CPC分类号： H04L1/0045 ,  H04L1/0057 ,  H04L1/20 ,  H04W52/125 ,  H04W52/20

    摘要： Techniques for performing erasure detection and power control for a transmission without error detection coding are described. For erasure detection, a transmitter transmits codewords via a wireless channel. A receiver computes a metric for each received codeword, compares the computed metric against an erasure threshold, and declares the received codeword to be “erased” or “non-erased”. The receiver dynamically adjusts the erasure threshold based on received known codewords to achieve a target level of performance. For power control, an inner loop adjusts the transmit power to maintain a received signal quality (SNR) at a target SNR. An outer loop adjusts the target SNR based on the status of received codewords (erased or non-erased) to achieve a target erasure rate. A third loop adjusts the erasure threshold based on the status of received known codewords (“good”, “bad”, or erased) to achieve a target conditional error rate.

    摘要翻译： 描述了用于对没有错误检测编码的传输进行擦除检测和功率控制的技术。 为了擦除检测，发射机经由无线信道发送码字。 接收机计算每个接收到的码字的度量，将所计算的度量与擦除阈值进行比较，并将接收的码字声明为“擦除”或“未擦除”。 接收机基于接收到的已知码字来动态地调整擦除阈值，以实现目标性能水平。 对于功率控制，内部环路调整发射功率以将接收信号质量（SNR）保持在目标SNR。 外部环路基于接收到的码字（擦除或未擦除）的状态来调整目标SNR以实现目标擦除率。 第三循环基于接收的已知码字的状态（“好”，“坏”或被擦除）来调整擦除阈值，以实现目标条件错误率。

    Power control for a wireless communication system utilizing orthogonal multiplexing
    60.
    发明授权
    Power control for a wireless communication system utilizing orthogonal multiplexing 有权
    利用正交复用的无线通信系统的功率控制

    公开(公告)号：US08452316B2

    公开(公告)日：2013-05-28

    申请号：US10897463

    申请日：2004-07-22

    申请人： Arak Sutivong ,  David Jonathan Julian ,  Avneesh Agrawal

    发明人： Arak Sutivong ,  David Jonathan Julian ,  Avneesh Agrawal

    IPC分类号： H04M1/00

    CPC分类号： H04W52/247 ,  H04B17/309 ,  H04L1/0045 ,  H04L1/0057 ,  H04L1/20 ,  H04W24/00 ,  H04W52/125 ,  H04W52/146 ,  H04W52/16 ,  H04W52/20 ,  H04W52/24 ,  H04W52/241 ,  H04W52/242 ,  H04W52/243 ,  H04W52/283 ,  H04W52/36 ,  H04W52/362 ,  H04W52/367 ,  H04W52/54 ,  H04W52/60 ,  H04W88/08

    摘要： Techniques for adjusting transmit power to mitigate both intra-sector interference to a serving base station and inter-sector interference to neighbor base stations are described. The amount of inter-sector interference that a terminal may cause may be roughly estimated based on the total interference observed by each neighbor base station, channel gains for the serving and neighbor base stations, and the current transmit power level. The transmit power may be decreased if high interference is observed by a neighbor base station and increased otherwise. The transmit power may be adjusted by a larger amount and/or more frequently if the terminal is located closer to the neighbor base station observing high interference and/or if the current transmit power level is higher, and vice versa. The intra-sector interference is maintained within an acceptable level by limiting a received SNR for the terminal to be within a range of allowable SNRs.

    摘要翻译： 描述了用于调整发射功率以减轻对服务基站的扇区内干扰和对邻近基站的扇区间干扰的技术。 终端可能引起的扇区间干扰的量可以基于每个相邻基站观测到的总干扰，服务和相邻基站的信道增益以及当前发射功率电平来大致估计。 如果邻近基站观测到高干扰，否则发射功率可能会降低。 如果终端位于更靠近观测到高干扰的邻近基站和/或当前发射功率电平较高时，发射功率可以更大量地和/或更频繁地进行调整，反之亦然。 通过将终端的接收的SNR限制在可允许的SNR的范围内，将扇区内的干扰维持在可接受的水平内。