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    • 23. 发明授权
    • Communications channel estimation
    • 通信信道估计
    • US08599969B2
    • 2013-12-03
    • US12540574
    • 2009-08-13
    • Yan ZhouJibing Wang
    • Yan ZhouJibing Wang
    • H04L27/06
    • H04L25/0248H04L25/0204H04L25/022H04L25/0228
    • Techniques for estimating the response of a communications channel. In an aspect, a channel autocorrelation matrix is derived based on, e.g., certain assumptions about the time delay profile, Doppler profile. An eigenvector decomposition is performed on the autocorrelation matrix, and a set of dominant eigenvectors is determined. A received pilot signal vector is projected onto a projection matrix derived from the dominant eigenvectors to generate a set of eigen-coefficients, which is then used to reconstruct an estimated channel vector. In an exemplary embodiment, the eigenvector-based approach is combined with a simplified minimum mean-square error based approach to generate an estimated channel vector when the received signal-to-noise ratio is below a threshold.
    • 用于估计通信信道响应的技术。 在一方面,基于例如关于时间延迟分布,多普勒分布的某些假设,导出信道自相关矩阵。 对自相关矩阵执行特征向量分解,并确定一组主要特征向量。 将接收到的导频信号向量投影到从主要特征向量导出的投影矩阵上,以生成一组本征系数,然后将其用于重建估计的信道向量。 在示例性实施例中,当基于特征向量的方法与基于简化的基于最小均方误差的方法组合时,当接收到的信噪比低于阈值时,生成估计的信道向量。
    • 25. 发明授权
    • Transmitter chain timing and transmit power control
    • 发射机链定时和发射功率控制
    • US08385465B2
    • 2013-02-26
    • US12268198
    • 2008-11-10
    • Tamer A. KadousBrian M. GeorgeJibing Wang
    • Tamer A. KadousBrian M. GeorgeJibing Wang
    • H04L25/49
    • H03G3/3042
    • In a communications system, transmitter power gain can be changed between symbols. A power gain change of a first part of a transmit chain is initiated a first time, whereas a power gain change of a second part of the transmit chain is initiated at a second time, such that the resulting power gain changes of the first and second parts both occur substantially within an inter-symbol time in a desired relationship to one another. In one example, the power gain change of the first part is initiated before the beginning of the inter-symbol time to account for expected serial bus latency between initiation and execution of the power gain change of the first part. The power gain change of the second part is initiated during the inter-symbol time such that overall power does not exceed an amount (for example, a maximum permitted under a communication standard).
    • 在通信系统中,可以在符号之间改变发射机功率增益。 第一次启动发射链的第一部分的功率增益变化,而在第二时间开始发射链的第二部分的功率增益变化,使得所得到的功率增益在第一和第二 部件都基本上在彼此期望的关系中的符号间时间内发生。 在一个示例中,第一部分的功率增益变化在符号间时间开始之前启动,以考虑第一部分的功率增益变化的启动和执行之间的预期串行总线等待时间。 第二部分的功率增益变化在符号间时间内启动,使得总功率不超过量(例如,在通信标准下允许的最大值)。
    • 26. 发明申请
    • MULTI-RADIO COEXISTENCE
    • 多无线电共享
    • US20120071103A1
    • 2012-03-22
    • US13229819
    • 2011-09-12
    • Tamer Adel KadousPranav DayalAshok MantravadiPeter GaalJibing Wang
    • Tamer Adel KadousPranav DayalAshok MantravadiPeter GaalJibing Wang
    • H04W24/10H04B15/00
    • H04W72/1215H04W52/243H04W72/1231H04W88/06
    • A method of wireless communication includes adjusting a channel quality indicator (CQI) to compensate for coexistence interference experienced between communication resources (such as an LTE radio and a Bluetooth radio). The CQI may be set to zero, falsely indicating to a serving enhanced NodeB that a UE is out of range, thereby creating a gap in LTE operation that may be used by an alternate radio access technology. To compensate for fluctuating interference, the CQI may be adjusted to incorporate average coexistence interference over a period of time. Alternatively, the CQI at a time may incorporate coexistence interference regardless of whether interference is experienced at that specific time. A CQI value may also be boosted to compensate for a CQI backoff. CQI may be adjusted to avoid a spiral of death effect.
    • 一种无线通信方法包括调整信道质量指示符(CQI)以补偿通信资源(例如LTE无线电和蓝牙无线电)之间经历的共存干扰。 CQI可以被设置为零,向服务增强型节点B虚拟地指示UE超出范围,从而在可能由替代无线电接入技术使用的LTE操作中产生间隙。 为了补偿波动的干扰,可以调整CQI以在一段时间内并入平均共存干扰。 或者,无论在该特定时间是否经历干扰,一次的CQI可以并入共存干扰。 还可以提升CQI值以补偿CQI回退。 可以调整CQI以避免死亡效应的螺旋。
    • 27. 发明申请
    • TRANSMITTER CHAIN TIMING AND TRANSMIT POWER CONTROL
    • 发射机链时序和发射功率控制
    • US20090245417A1
    • 2009-10-01
    • US12268198
    • 2008-11-10
    • Tamer A. KadousBrian M. GeorgeJibing Wang
    • Tamer A. KadousBrian M. GeorgeJibing Wang
    • H04L25/49
    • H03G3/3042
    • In a communications system, transmitter power gain can be changed between symbols. A power gain change of a first part of a transmit chain is initiated a first time, whereas a power gain change of a second part of the transmit chain is initiated at a second time, such that the resulting power gain changes of the first and second parts both occur substantially within an inter-symbol time in a desired relationship to one another. In one example, the power gain change of the first part is initiated before the beginning of the inter-symbol time to account for expected serial bus latency between initiation and execution of the power gain change of the first part. The power gain change of the second part is initiated during the inter-symbol time such that overall power does not exceed an amount (for example, a maximum permitted under a communication standard).
    • 在通信系统中,可以在符号之间改变发射机功率增益。 第一次启动发射链的第一部分的功率增益变化,而在第二时间开始发射链的第二部分的功率增益变化,使得所得到的功率增益在第一和第二 部件都基本上在彼此期望的关系中的符号间时间内发生。 在一个示例中,第一部分的功率增益变化在符号间时间开始之前启动,以考虑第一部分的功率增益变化的启动和执行之间的预期串行总线等待时间。 第二部分的功率增益变化在符号间时间内启动,使得总功率不超过量(例如,在通信标准下允许的最大值)。