公开(公告)号：US20090146863A1

公开(公告)日：2009-06-11

申请号：US12240228

申请日：2008-09-29

申请人： Chun Hsien Wen ,  Jiunn Tsair Chen

发明人： Chun Hsien Wen ,  Jiunn Tsair Chen

IPC分类号： G01S7/42

CPC分类号： G01S7/021 ,  H04W16/14

摘要： A method for detecting radar signal comprises the steps of: sampling a received signal so as to obtain a plurality Of sampling values; taking an absolute value of the sampling values so as to obtain at least two parameters; and determining whether the received signal includes radar signals in accordance with the at least two parameters.

摘要翻译： 一种用于检测雷达信号的方法包括以下步骤：对接收到的信号进行采样以获得多个采样值; 获取采样值的绝对值，以获得至少两个参数; 以及根据所述至少两个参数来确定所接收的信号是否包括雷达信号。

公开(公告)号：US07486655B2

公开(公告)日：2009-02-03

申请号：US11327217

申请日：2006-01-05

申请人： Pang-An Ting ,  Chao-Kai Wen ,  Wei-Ping Chuang ,  Jiunn-Tsair Chen

发明人： Pang-An Ting ,  Chao-Kai Wen ,  Wei-Ping Chuang ,  Jiunn-Tsair Chen

IPC分类号： H04J1/00

CPC分类号： H04L25/0206 ,  H04B7/0417 ,  H04B7/0626 ,  H04L1/0026 ,  H04L1/06 ,  H04L25/0248 ,  H04L25/03343 ,  H04L27/2601 ,  H04L2025/03414 ,  H04L2025/03426

摘要： The present invention provides an antenna-array-based multiple-input multiple-output orthogonal-frequency-division-multiplexing (MIMO-OFDM) system and a pre-coding and feedback method used in the same. The present invention uses QR decompositions of the MIMO channel matrixes to parameterize the channel state information (CSI) of every OFDM frequency band. In addition, the present invention feeds back the information related to θ and φ in the Givens rotation matrixes of the partial frequency bands and then uses an interpolation method to generate θ and φ in the Givens rotation matrixes of all the frequency bands, which further is able to represent the CSI of all the frequency bands. In this way, the present invention has advantages of low complexity and low feedback rate requirement.

摘要翻译： 本发明提供了一种基于天线阵列的多输入多输出正交频分复用（MIMO-OFDM）系统及其中使用的预编码和反馈方法。 本发明使用MIMO信道矩阵的QR分解来参数化每个OFDM频带的信道状态信息（CSI）。 此外，本发明反馈了与部分频带的Givens旋转矩阵中的θ和phi相关的信息，然后使用内插方法来产生所有频带的Givens旋转矩阵中的θ和φi，这进一步是 能够表示所有频段的CSI。 这样，本发明具有复杂度低，反馈率低的优点。

公开(公告)号：US20080129505A1

公开(公告)日：2008-06-05

申请号：US11752309

申请日：2007-05-23

申请人： Chih-Hung Lin ,  Chia-Jen Yu ,  Jiunn-Tsair Chen

发明人： Chih-Hung Lin ,  Chia-Jen Yu ,  Jiunn-Tsair Chen

IPC分类号： G08B13/14

CPC分类号： G06K7/0008 ,  H04L7/042

摘要： A method and a system for reading radio frequency identification (RFID) tags are provided. The method includes the following steps. First, receive a tag signal from the RFID tag. Recover a data clock rate from the tag signal according to statistics of pulse lengths of the tag signal. Next, determine a frame synchronization point of a data frame following a preamble in the tag signal by a signal correlation between the preamble and a predetermined signal pattern according to the data clock rate. Finally, decode the data frame by using an adaptive Viterbi algorithm on an extended trellis diagram. The extended trellis diagram includes a plurality of nodes and a plurality of branches connecting the nodes. The nodes and the branches are arranged according to the modulation scheme of the data frame and possible variations of the data clock rate.

摘要翻译： 提供了一种用于读取射频识别（RFID）标签的方法和系统。 该方法包括以下步骤。 首先，从RFID标签接收标签信号。 根据标签信号的脉冲长度的统计，从标签信号中恢复数据时钟速率。 接下来，根据数据时钟速率，通过前导码和预定信号模式之间的信号相关来确定标签信号中的前导码之后的数据帧的帧同步点。 最后，通过在扩展网格图上使用自适应维特比算法对数据帧进行解码。 扩展网格图包括多个节点和连接节点的多个分支。 节点和分支根据数据帧的调制方案和数据时钟速率的可能变化进行排列。

公开(公告)号：US20080117050A1

公开(公告)日：2008-05-22

申请号：US11753844

申请日：2007-05-25

申请人： Cheng-Hsuan Wu ,  Jiunn-Tsair Chen ,  Shu-Hsien Wang ,  Jian-Ren Chen

发明人： Cheng-Hsuan Wu ,  Jiunn-Tsair Chen ,  Shu-Hsien Wang ,  Jian-Ren Chen

IPC分类号： G08B13/14

CPC分类号： G06K17/0022

摘要： A wireless radio frequency identification (RFID) system is provided. The wireless RFID system includes at least one passive RFID tag, at least one active RFID tag and at least one sink apparatus. The active RFID tag transmits a wireless query signal to detect whether the passive RFID tag and /or other active RFID tags are in its scanning range according to a transmission specification. Moreover, the active RFID tag collects the detecting result into an inventory data, converts itself to one passive RFID tag, and transmits the inventory data to other active RFID tags utilizing the same method. Then, an identification data in the passive RFID tag and /or the inventory data in the active RFID tag are read by the sink apparatus according to the above-mentioned transmission specification. Therefore, the wireless RFID only uses a signal transmission specification to route the data back to the sink apparatus.

摘要翻译： 提供无线射频识别（RFID）系统。 无线RFID系统包括至少一个无源RFID标签，至少一个有源RFID标签和至少一个信宿设备。 有源RFID标签根据传输规范发送无线查询信号以检测无源RFID标签和/或其他有源RFID标签是否处于其扫描范围。 此外，有源RFID标签将检测结果收集到库存数据中，将其自身转换成一个无源RFID标签，并使用相同的方法将库存数据传送到其他有源RFID标签。 然后，根据上述传输规范，由宿设备读取无源RFID标签中的识别数据和/或有源RFID标签中的清单数据。 因此，无线RFID仅使用信号传输规范将数据路由回宿设备。

公开(公告)号：US6144710A

公开(公告)日：2000-11-07

申请号：US65193

申请日：1998-04-23

申请人： Jiunn-Tsair Chen ,  Young-Kai Chen ,  Huan-Shang Tsai

发明人： Jiunn-Tsair Chen ,  Young-Kai Chen ,  Huan-Shang Tsai

IPC分类号： H04B7/26 ,  H03M13/23 ,  H04B7/005 ,  H04L25/02 ,  H03D1/04 ,  H03D1/06 ,  H03K5/01 ,  H03K6/04 ,  H04B1/10

CPC分类号： H04L25/0204

摘要： A cellular communication signal receiver receives a desired signal in the presence of at least one co-channel interference signal. The receiver comprises a channel estimator configured to receive a plurality of training signal samples to estimate the finite impulse response to the desired signal and the co-channel interference signal. The finite impulse response estimates having a predetermined number of channel taps defining the length of the desired channel and the length of co-channel interference channel. A Viterbi decoder is coupled to the channel estimator, and configured to receive the desired and co-channel interference signals. The channel estimator generates channel tap estimates. A power calculator is coupled to the channel estimator and configured to estimate the power of the estimated channel taps. A joint channel trimmer is coupled to the power calculator and configured to maintain a joint channel length, such that the desired signal channel length plus the co-channel interference channel length have a fixed size that defines the number of states the Viterbi decoder allocates to the desired signal and the co-channel interference signal.

摘要翻译： 蜂窝通信信号接收机在存在至少一个同信道干扰信号的情况下接收所需信号。 接收机包括信道估计器，其被配置为接收多个训练信号采样以估计对期望信号和同信道干扰信号的有限脉冲响应。 有限脉冲响应估计具有预定数量的信道抽头，其定义所需信道的长度和同信道干扰信道的长度。 维特比解码器耦合到信道估计器，并且被配置为接收期望的和同信道干扰信号。 信道估计器产生信道抽头估计。 功率计算器耦合到信道估计器并且被配置为估计所估计的信道抽头的功率。 联合通道微调器耦合到功率计算器并且被配置为保持联合通道长度，使得期望的信道信道长度加上同信道干扰信道长度具有固定的大小，其定义维特比解码器分配给的信道的数量 所需信号和同信道干扰信号。

公开(公告)号：US5963091A

公开(公告)日：1999-10-05

申请号：US53469

申请日：1998-04-01

申请人： Jiunn-Tsair Chen ,  Huan-Shang Tsai

发明人： Jiunn-Tsair Chen ,  Huan-Shang Tsai

IPC分类号： H03F1/32 ,  H03F1/00

CPC分类号： H03F1/3229

摘要： A feedforward linearizer for amplifying an input signal comprises a signal cancellation circuit which has a first branch and a second branch. A first amplifier provided in the first branch receives the input signal intended to be amplified and generates an output signal received by a signal cancellation vector modulator. A signal cancellation adder receives the signal generated by the signal cancellation vector modulator and the input signal via the second branch and provides an error signal. The feedforward linearizer also comprises an error cancellation circuit that has a first branch and a second branch. An error cancellation adder in the first branch receives the output signal provided by the first amplifier and generates the output signal of the linearizer. An error cancellation vector modulator in the second branch receives an error signal provided by the signal cancellation adder and provides an error adjusted signal to a second auxiliary amplifier. The second auxiliary amplifier provides an input signal to the error cancellation adder. A digital signal processor, comprising a signal processing circuit, provides a signal cancellation adjustment signal, .alpha., to the signal cancellation vector modulator and an error cancellation adjustment signal, .beta., to the error cancellation vector modulator, such that the output signal of the signal cancellation adder is a signal that substantially represents the error components provided by the first amplifier, and the output signal of the error cancellation adder is an amplified version of the input signal, with substantially no intermodulation components.

摘要翻译： 用于放大输入信号的前馈线性化电路包括具有第一分支和第二分支的信号消除电路。 设置在第一分支中的第一放大器接收要被放大的输入信号，并产生由信号消除矢量调制器接收的输出信号。 信号消除加法器通过第二分支器接收由信号消除矢量调制器产生的信号和输入信号，并提供误差信号。 前馈线性化电路还包括具有第一分支和第二分支的误差消除电路。 第一分支中的误差消除加法器接收由第一放大器提供的输出信号，并产生线性化器的输出信号。 第二分支中的误差消除矢量调制器接收由信号消除加法器提供的误差信号，并向第二辅助放大器提供误差调整信号。 第二辅助放大器向误差消除加法器提供输入信号。 包括信号处理电路的数字信号处理器向信号消除矢量调制器提供信号消除调整信号α，并将误差消除调整信号β提供给误差消除矢量调制器，使得信号的输出信号 取消加法器是基本上表示由第一放大器提供的误差分量的信号，误差消除加法器的输出信号是输入信号的放大版本，基本上没有互调分量。

公开(公告)号：US08217834B2

公开(公告)日：2012-07-10

申请号：US12499635

申请日：2009-07-08

申请人： Chun Hsien Wen ,  Jiunn Tsair Chen ,  Cheng Hsuan Wu ,  Yen Chin Liao

发明人： Chun Hsien Wen ,  Jiunn Tsair Chen ,  Cheng Hsuan Wu ,  Yen Chin Liao

IPC分类号： H01Q3/00

CPC分类号： H01Q3/2605 ,  H04B7/0617 ,  H04B7/0634 ,  H04B7/0663 ,  H04L25/0248 ,  H04L25/03343 ,  H04L25/03949 ,  H04L25/03961 ,  H04L2025/03802 ,  H04W16/28 ,  H04W24/00

摘要： The method for beamforming in a wireless communication system comprises the steps of: receiving a sounding packet so as to estimate channel state information between a transmitter and a receiver; generating a beamforming matrix in accordance with the channel state information; generating a beamforming steering matrix by multiplying the beamforming matrix by a rotation matrix; and feeding back the beamforming steering matrix.

摘要翻译： 无线通信系统中波束成形的方法包括以下步骤：接收探测分组，以估计发射机与接收机之间的信道状态信息; 根据信道状态信息生成波束成形矩阵; 通过将所述波束形成矩阵乘以旋转矩阵来生成波束成形导引矩阵; 并反馈波束形成导向矩阵。

公开(公告)号：US20100289699A1

公开(公告)日：2010-11-18

申请号：US12614450

申请日：2009-11-09

申请人： Cheng-Hsuan Wu ,  Chin-Tseng Huang ,  Yung-Szu Tu ,  Jiunn-Tsair Chen

发明人： Cheng-Hsuan Wu ,  Chin-Tseng Huang ,  Yung-Szu Tu ,  Jiunn-Tsair Chen

IPC分类号： G01S3/02

CPC分类号： G01S5/0294

摘要： A method for determining a position of a mobile station in a wireless communication system includes generating a state equation set according to a current state of the mobile station, for predicting a position and a velocity of the mobile station after a predetermined period, and corresponding the state equation set to a graphic interface for calculating the position and the velocity after the predetermined period.

摘要翻译： 一种用于确定无线通信系统中的移动台的位置的方法包括根据移动台的当前状态生成一个状态方程组，用于在预定时段之后预测移动台的位置和速度，并且对应于 状态方程设置为用于计算预定时段之后的位置和速度的图形界面。

公开(公告)号：US20100272167A1

公开(公告)日：2010-10-28

申请号：US12430893

申请日：2009-04-28

申请人： Yen-Chin Liao ,  Yung-Szu Tu ,  Cheng-Hsuan Wu ,  Jiunn-Tsair Chen

发明人： Yen-Chin Liao ,  Yung-Szu Tu ,  Cheng-Hsuan Wu ,  Jiunn-Tsair Chen

IPC分类号： H04B17/00

CPC分类号： H04L1/0021 ,  H04L1/0003 ,  H04L1/0009 ,  H04L1/1607

摘要： The present invention provides a method for simplifying a probabilistic rate adaptation procedure in a wireless communication system, which comprises calculating a conditional probability density function of SNR of a transmitted signal by the probabilistic rate adaptation procedure, to generate an SNR estimation result, taking logarithm on the SNR estimation result to generate a logarithm result, and partitioning SNR values into a plurality of regions according to the logarithm result, to generate a discrete function from the SNR estimation result.

摘要翻译： 本发明提供了一种用于简化无线通信系统中的概率速率自适应过程的方法，其包括通过概率速率自适应过程计算发射信号的SNR的条件概率密度函数，以产生SNR估计结果，以对数 所述SNR估计结果产生对数结果，并且根据所述对数结果将SNR值分割成多个区域，以从所述SNR估计结果生成离散函数。

公开(公告)号：US20100265929A1

公开(公告)日：2010-10-21

申请号：US12571071

申请日：2009-09-30

申请人： YEN CHIN LIAO ,  YUNG SZU TU ,  CHENG HSUAN WU ,  JIUNN TSAIR CHEN

发明人： YEN CHIN LIAO ,  YUNG SZU TU ,  CHENG HSUAN WU ,  JIUNN TSAIR CHEN

IPC分类号： H04W40/00

CPC分类号： H04L1/0003 ,  H04L1/0009 ,  H04L1/0019

摘要： A method for determining a modulation and coding scheme for signals with packets of different lengths comprises the steps of: grouping signals according to their packet lengths, wherein each group has a weighting for each modulation and coding scheme; transmitting signals with different modulation and coding schemes; adjusting weights of each modulation and coding scheme of each group according to the quality of receiving the transmitted signals; determining a modulation and coding scheme according to the weightings of each modulation and coding scheme in the group corresponding to the packet length of the signal to be transmitted.

摘要翻译： 用于确定具有不同长度的分组的信号的调制和编码方案的方法包括以下步骤：根据它们的分组长度对信号进行分组，其中每个组对每个调制和编码方案具有加权; 以不同的调制和编码方案传输信号; 根据接收发送信号的质量调整每组调制编码方案的权重; 根据与要发送的信号的分组长度相对应的组中的每个调制和编码方案的加权来确定调制和编码方案。