公开(公告)号：US07016644B2

公开(公告)日：2006-03-21

申请号：US10371425

申请日：2003-02-21

申请人： Feng-Wen Sun

发明人： Feng-Wen Sun

IPC分类号： H04B7/185

CPC分类号： H04B7/18517 ,  H04B7/18528

摘要： An approach is provided for compensating for non-linearity in an overlaid radio communication system, such as a satellite network, wherein a terminal and a hub station communicates bi-directionally using a composite signal that is transmitted from a relay station and includes an inbound signal overlaid with an outbound signal. A look-up table stores information used to determine an inverse of a function associated with a non-linear effect of a received composite signal. The inbound signal has a predetermined spectral configuration. The device also includes a multiplier configured to generate a product of the look-up table and the received composite signal. Also, the device includes an estimation module configured to output an estimate of the inbound signal based upon the product. Further, the device includes a filter configured to filter the estimate of the inbound signal according to the predetermined spectral configuration, wherein the filtered estimate is utilized to refine an estimate of the instantaneous operating point of an amplifier associated with the non-linearity (e.g., satellite transponder), wherein an output signal representing the inbound signal is generated based upon the refined estimate.

摘要翻译： 提供了一种用于补偿覆盖的无线电通信系统（例如卫星网络）中的非线性的方法，其中终端和中心站使用从中继站发送的复合信号双向通信，并且包括入站信号 覆盖有出站信号。 查找表存储用于确定与接收到的复合信号的非线性效应相关联的函数的逆的信息。 入站信号具有预定的频谱配置。 该设备还包括被配置为生成查找表和接收的复合信号的乘积的乘法器。 另外，该装置包括估计模块，该估计模块被配置为基于该产品来输出入站信号的估计。 此外，该设备包括被配置为根据预定频谱配置对入站信号的估计进行滤波的滤波器，其中利用滤波估计来改善与非线性相关联的放大器的瞬时工作点的估计（例如， 卫星转发器），其中基于精确估计生成表示入站信号的输出信号。

公开(公告)号：US20050286405A1

公开(公告)日：2005-12-29

申请号：US11009333

申请日：2004-12-10

申请人： Feng-Wen Sun ,  Lakshmi Iyer

发明人： Feng-Wen Sun ,  Lakshmi Iyer

IPC分类号： H04B1/707 ,  H04B7/185 ,  H04J11/00 ,  H04J13/00

CPC分类号： H04W72/0466 ,  H04B1/7103 ,  H04B7/1858 ,  H04J13/102 ,  H04J13/16 ,  H04W72/082

摘要： An approach is provided for minimizing co-channel interference in a communication system is disclosed. Non-header portions of frames, which are transmitted over the communication system, are scrambled according to respective different scrambling sequences. The above arrangement is particularly suited to a digital satellite broadcast and interactive system.

摘要翻译： 提供了一种用于最小化通信系统中的同信道干扰的方法。 通过通信系统发送的帧的非标题部分根据各自不同的加扰序列进行加扰。 上述布置特别适用于数字卫星广播和交互式系统。

公开(公告)号：US20050032472A1

公开(公告)日：2005-02-10

申请号：US10637225

申请日：2003-08-08

申请人： Yimin Jiang ,  Feng-Wen Sun

发明人： Yimin Jiang ,  Feng-Wen Sun

IPC分类号： H04B1/04 ,  H04B7/185

CPC分类号： H04B7/18515 ,  H04B1/0475

摘要： An approach is provided estimating non-linear characteristics of an amplifier (such as a Travelling Wave Tube Amplifier) used to amplify a composite signal in a radio communication system. The composite signal, which includes a plurality of inbound signals overlay on an outbound signal, is sampled. The outbound signal is utilized as a training signal. Coarse estimates of the response of the amplifier is generated based on the samples of the composite signal and the training signal. Further, the interference associated with the inbound signals are removed from the estimation of the response of the amplifier by curve-fitting and estimating interference characteristics of the composite signal. An estimated response of the amplifier is thus output, and can be utilized to provide accurate non-linearity compensation and cancellation.

摘要翻译： 提供了一种用于估计用于在无线电通信系统中放大复合信号的放大器（例如行波管放大器）的非线性特性的方法。 对包括在出站信号上叠加的多个入站信号的复合信号进行采样。 出站信号用作训练信号。 基于复合信号和训练信号的样本，产生放大器响应的粗估计。 此外，通过曲线拟合和估计复合信号的干扰特性，从入射信号相关的干扰从放大器的响应的估计中去除。 因此输出放大器的估计响应，并且可以用于提供准确的非线性补偿和消除。

公开(公告)号：US06295311B1

公开(公告)日：2001-09-25

申请号：US08966253

申请日：1997-11-07

申请人： Feng-Wen Sun

发明人： Feng-Wen Sun

IPC分类号： H04K100

CPC分类号： H04B1/707

摘要： A method and apparatus for estimating the phase of noncoherently detected signals is provided. The received signals are in-phase and quadrature-phase signals from fingers of a rake receiver. A joint detection and estimation strategy is employed to increase the received signal-to-noise ratio of a code-division multiple access (CDMA) communication system. An orthogonally encoded signal is noncoherently detected and select signal components from the received signal are used in estimating the unknown phase and strength of the signal. Values are determined by a Fast Hadamard Transform indicative of a likelihoods that estimated signals correspond to the transmitted signal. Corresponding values are summed and the index of the largest sum is used to select likelihood values. A weight is developed by accumulating a plurality of the selected values over a predefined time period and calculating an average of the plurality, or a subset of the plurality. The likelihood values are then scaled, by multiplying them by the weight, and again combined by summing corresponding values.

摘要翻译： 提供了用于估计非相干检测信号的相位的方法和装置。 所接收的信号是来自耙式接收机的手指的同相和正交相位信号。 采用联合检测和估计策略来增加码分多址（CDMA）通信系统的接收信噪比。 正交编码的信号被非相干检测，并且从接收信号中选择信号分量用于估计信号的未知相位和强度。 值由通过表示估计信号对应于发送信号的可能性的快速哈达玛变换来确定。 将相应的值相加，并使用最大和的索引来选择似然值。 通过在预定时间段内累积多个所选择的值并计算多个或多个的子集的平均值，来产生权重。 然后，通过将似然值乘以权重，然后通过对相应值求和来再次合并。