-
41.发明授权Method for controlling peak-to-average power ratio of single carrier FDMA system 有权用于控制单载波FDMA系统的峰均功率比的方法公开(公告)号：US08594590B2
公开(公告)日：2013-11-26
申请号：US12982989
申请日：2010-12-31
IPC分类号： H04B1/04
CPC分类号： H03F1/02 , H03F3/24 , H03F2200/435 , H03F2200/66 , H04L27/2623 , H04L27/2636
摘要： A method for controlling peak-to-average power ratio prior to amplification by a power amplifier is provided. The peak sample of a signal is predicted, window length is adjusted based on the peak width around the peak sample or subcarriers used to transmit the signal, and the window is subsequently used to clip the samples. A peak suppression window may be applied prior to predicting the peak sample when a set number of samples exceed a predetermined threshold. Window clipping may be deactivated if interference and throughput of the power amplifier is detrimentally affected. A pulse shaping filter may be optimized based on the window clipping to control transmitted signal characteristics. Various thresholds used in the prediction may be initially based on system design and power amplifier linearity and then dynamically adjusted based on an estimation of active subcarriers or of interferers present in the communication system.
摘要翻译： 提供了一种用于在功率放大器放大之前控制峰值与平均功率比的方法。 预测信号的峰值采样，基于用于发送信号的峰值采样或子载波周围的峰值宽度来调整窗口长度，并且窗口随后用于剪辑采样。 当设定数量的样本超过预定阈值时，可以在预测峰值采样之前应用峰值抑制窗口。 如果功率放大器的干扰和吞吐量受到不利影响，则可以禁用窗口削波。 可以基于窗口限幅来优化脉冲整形滤波器以控制发射信号特性。 预测中使用的各种阈值可以最初基于系统设计和功率放大器线性度，然后基于在通信系统中存在的活动子载波或干扰源的估计来动态调整。
-
公开(公告)号：US08565702B2
公开(公告)日：2013-10-22
申请号：US12817007
申请日：2010-06-16
IPC分类号： H04B1/10
CPC分类号： H04B1/1661 , H03G3/348
摘要： A channel scanning technique and apparatus provides audio hole suppression in two-way radio communications. Upon detecting the absence of a carrier signal on a priority channel during a priority scan mode of operation, a training waveform is constructed upon returning to the home-channel. The training waveform is applied to audio shaping filters within an audio lineup to suppress transients and minimize or eliminate the occurrence of audio pops at a speaker output thereby reducing the audio hole.
摘要翻译： 信道扫描技术和装置在双向无线电通信中提供音频孔抑制。 在优先扫描操作模式期间检测到在优先信道上不存在载波信号时，在返回归属信道时构建训练波形。 训练波形被应用于音频阵容中的音频整形滤波器以抑制瞬变，并且最小化或消除扬声器输出处的音频弹出的发生，从而减少音频孔。
-
43.发明授权公开(公告)号：US08611479B2
公开(公告)日：2013-12-17
申请号：US13314603
申请日：2011-12-08
IPC分类号： H03D1/04
CPC分类号： H04B1/30
摘要： A communication system comprises a direct conversion receiver for correcting imbalance errors. The direct conversion receiver receives a radio frequency (RF) signal and converts the RF signal to baseband signals. The direct conversion receiver further translates the baseband signals to digital signals having a direct current (DC) offset and applies a DC offset correction to the digital signals having the DC offset to generate first DC offset corrected signals. An imbalance correction unit of the direct conversion receiver applies an imbalance correction to the first DC offset corrected signals by estimating an error between an average envelope of the first DC offset corrected signals and an average envelope of second DC offset corrected signals. The imbalance correction unit is fixed at initial imbalance parameter values. The direct conversion receiver further updates the initial imbalance parameter values of the imbalance correction unit based on the estimated error for correcting imbalance errors.
摘要翻译： 通信系统包括用于校正不平衡误差的直接转换接收器。 直接转换接收器接收射频（RF）信号并将RF信号转换为基带信号。 直接转换接收器进一步将基带信号转换为具有直流（DC）偏移的数字信号，并将DC偏移校正应用于具有DC偏移的数字信号以产生第一DC偏移校正信号。 直接变换接收器的不平衡校正单元通过估计第一DC偏移校正信号的平均包络和第二DC偏移校正信号的平均包络之间的误差来对第一DC偏移校正信号施加不平衡校正。 不平衡校正单元固定在初始不平衡参数值。 直接变换接收机进一步基于用于校正不平衡误差的估计误差来更新不平衡校正单元的初始不平衡参数值。
-
44.发明申请METHOD FOR CONTROLLING PEAK-TO-AVERAGE POWER RATIO OF SINGLE CARRIER FDMA SYSTEM 有权用于控制单载波FDMA系统的峰值平均功率比的方法公开(公告)号：US20120171975A1
公开(公告)日：2012-07-05
申请号：US12982989
申请日：2010-12-31
IPC分类号： H01Q11/12
CPC分类号： H03F1/02 , H03F3/24 , H03F2200/435 , H03F2200/66 , H04L27/2623 , H04L27/2636
摘要： A method for controlling peak-to-average power ratio prior to amplification by a power amplifier is provided. The peak sample of a signal is predicted, window length is adjusted based on the peak width around the peak sample or subcarriers used to transmit the signal, and the window is subsequently used to clip the samples. A peak suppression window may be applied prior to predicting the peak sample when a set number of samples exceed a predetermined threshold. Window clipping may be deactivated if interference and throughput of the power amplifier is detrimentally affected. A pulse shaping filter may be optimized based on the window clipping to control transmitted signal characteristics. Various thresholds used in the prediction may be initially based on system design and power amplifier linearity and then dynamically adjusted based on an estimation of active subcarriers or of interferers present in the communication system.
摘要翻译： 提供了一种用于在功率放大器放大之前控制峰值与平均功率比的方法。 预测信号的峰值采样，基于用于发送信号的峰值采样或子载波周围的峰值宽度来调整窗口长度，并且窗口随后用于剪辑采样。 当设定数量的样本超过预定阈值时，可以在预测峰值采样之前应用峰值抑制窗口。 如果功率放大器的干扰和吞吐量受到不利影响，则可以禁用窗口削波。 可以基于窗口限幅来优化脉冲整形滤波器以控制发射信号特性。 预测中使用的各种阈值可以最初基于系统设计和功率放大器线性度，然后基于在通信系统中存在的活动子载波或干扰源的估计来动态调整。
-
45.发明申请METHOD AND APPARATUS FOR REMOVING DC OFFSET IN A DIRECT CONVERSION RECEIVER 有权用于在直接转换接收器中移除直流偏置的方法和装置公开(公告)号：US20100144303A1
公开(公告)日：2010-06-10
申请号：US12329034
申请日：2008-12-05
IPC分类号： H04B1/10
CPC分类号： H04B1/30 , H04L25/061
摘要： A method and apparatus for correcting direct current (DC) offset errors of a received signal in a direct conversion receiver (DCR) are provided. DC offset correction algorithms are incorporated into the DCR, each algorithm being optimized for a particular receive signal operating environment. The DC offset correction algorithms remove DC offset errors in baseband In-phase and Quadrature-phase signals received within the direct conversion receiver baseband signal path. Individual DC offset correction algorithms are selected for use as determined by a signal quality estimator component. A DC offset correction component of the direct conversion receiver determines an appropriate DC offset correction algorithm suited for a particular operating environment. A criterion for a signal quality estimate is set to control transitioning between DCOC algorithms. A dual threshold strategy may be adopted to transition between one DC offset correction algorithm and another DC offset correction algorithm to provide hysteresis.
摘要翻译： 提供一种用于校正直接转换接收机（DCR）中的接收信号的直流（DC）偏移误差的方法和装置。 DC偏移校正算法被并入到DCR中，每个算法针对特定的接收信号操作环境进行优化。 DC偏移校正算法消除了在直接转换接收机基带信号路径内接收的基带同相和正交相信号中的直流失调误差。 选择单个DC偏移校正算法以由信号质量估计器组件确定使用。 直接转换接收机的DC偏移校正分量确定适合于特定操作环境的适当DC偏移校正算法。 设置信号质量估计的标准来控制DCOC算法之间的转换。 可以采用双阈值策略来在一个DC偏移校正算法和另一个DC偏移校正算法之间转换以提供滞后。
-
-
-
-
搜索结果
45 条记录 (耗时 0.021 秒)
