公开(公告)号：US20080219148A1

公开(公告)日：2008-09-11

申请号：US12124290

申请日：2008-05-21

申请人： Kuo-Hui Li ,  Charles Huang ,  Mao-Ching Chiu ,  Hung-Kun Chen ,  Chao-Ming Chang

发明人： Kuo-Hui Li ,  Charles Huang ,  Mao-Ching Chiu ,  Hung-Kun Chen ,  Chao-Ming Chang

IPC分类号： H04J11/00

CPC分类号： H04L27/2626 ,  H04L1/0618

摘要： A system and method for transmitting data in multiple-branch transmitter-diversity OFDM systems is presented. In one embodiment, an approach is taken where an inverse Fourier transform (IFT) is performed on data prior to encoding the data for transmission in the multiple-branch transmitter-diversity system. In another embodiment an IFT is performed on data prior to encoding the data using a space-time block code (STBC) algorithm.

摘要翻译： 提出了一种在多分支发射机分集OFDM系统中传输数据的系统和方法。 在一个实施例中，采用对在多分支发射机分集系统中传输数据进行编码之前的数据执行逆傅里叶变换（IFT）的方法。 在另一实施例中，使用空时块码（STBC）算法在对数据进行编码之前对数据执行IFT。

公开(公告)号：US07272108B2

公开(公告)日：2007-09-18

申请号：US10308513

申请日：2002-12-03

申请人： Kuo Hui Li ,  Charles Huang ,  Mao-Ching Chiu ,  Hung-Kun Chen ,  Chao-Ming Chang

发明人： Kuo Hui Li ,  Charles Huang ,  Mao-Ching Chiu ,  Hung-Kun Chen ,  Chao-Ming Chang

IPC分类号： H04J11/00 ,  H04K1/10 ,  H04B7/10

CPC分类号： H04L5/0048 ,  H04B7/0613 ,  H04L1/0618 ,  H04L5/0023 ,  H04L25/0204 ,  H04L25/0226 ,  H04L25/0228

摘要： A system and method for estimating channel characteristics in orthogonal frequency-division multiplexing (OFDM) systems with transmitter diversity is presented. The disclosed approach is compatible with the Institute of Electrical and Electronics Engineers (IEEE) “Wireless Local Area Network (LAN) Medium Access Control (MAC) and Physical Layer (PHY) Specification.” In the disclosed system and method, an additional training symbol is transmitted during the data period. This provides additional information that may be used to more accurately estimate channel characteristics.

摘要翻译： 提出了一种用于估计具有发射机分集的正交频分复用（OFDM）系统中的信道特性的系统和方法。 所公开的方法与电气和电子工程师协会（IEEE）“无线局域网（LAN）媒体接入控制（MAC）和物理层（PHY）规范”兼容。 在所公开的系统和方法中，在数据周期期间传送附加的训练符号。 这提供了可用于更准确地估计信道特性的附加信息。

公开(公告)号：US07394754B2

公开(公告)日：2008-07-01

申请号：US10301046

申请日：2002-11-21

申请人： Kuo Hui Li ,  Charles Huang ,  Mao-Ching Chiu ,  Hung-Kun Chen ,  Chao-Ming Chang

发明人： Kuo Hui Li ,  Charles Huang ,  Mao-Ching Chiu ,  Hung-Kun Chen ,  Chao-Ming Chang

IPC分类号： H04J11/00 ,  H04L27/00 ,  H04B1/04

CPC分类号： H04L27/2626 ,  H04L1/0618

摘要： A system and method for transmitting data in multiple-branch transmitter-diversity OFDM systems is presented. In one embodiment, an approach is taken where an inverse Fourier transform (IFT) is performed on data prior to encoding the data for transmission in the multiple-branch transmitter-diversity system. In another embodiment an IFT is performed on data prior to encoding the data using a space-time block code (STBC) algorithm.

摘要翻译： 提出了一种用于在多分支发射机分集OFDM系统中传输数据的系统和方法。 在一个实施例中，采用对在多分支发射机分集系统中传输数据进行编码之前的数据执行逆傅里叶变换（IFT）的方法。 在另一实施例中，使用空时块码（STBC）算法在对数据进行编码之前对数据执行IFT。

公开(公告)号：US07254185B2

公开(公告)日：2007-08-07

申请号：US10065678

申请日：2002-11-07

申请人： Mao-Ching Chiu ,  Chi-Chao Chao ,  Chao-Ming Chang ,  Tai-Yuan Cheng ,  Hung-Kun Chen

发明人： Mao-Ching Chiu ,  Chi-Chao Chao ,  Chao-Ming Chang ,  Tai-Yuan Cheng ,  Hung-Kun Chen

IPC分类号： H03K9/00

CPC分类号： H04L7/0029 ,  H04L7/0004

摘要： A method is directed to recovering a digital data content in a communication system, wherein the digital data content has been converted into an analog signal based on a primary clock, at a transmitter for transmitting to a receiver. The method comprises receiving the analog signal by the receiver. The analog signal is converted into a digital signal, based on a clock of the receiver. The digital signal is interpolated at the desired interpolation point, if digital signal in time has been shifted by an amount equal to or larger than a predetermined time length. The interpolated digital signal is recovered back to the digital data content, with the assist of an estimated channel impulse response. The channel impulse response is retrained every time when the interpolation point is significantly changed.

摘要翻译： 一种方法涉及在通信系统中恢复数字数据内容，其中在用于发送到接收机的发射机处，数字数据内容已经被转换为基于主时钟的模拟信号。 该方法包括由接收器接收模拟信号。 基于接收机的时钟，模拟信号被转换为数字信号。 数字信号在期望的插补点被内插，如果时间上的数字信号被移位了等于或大于预定时间长度的量。 借助于估计的信道脉冲响应的辅助，内插的数字信号被恢复回数字数据内容。 每当插补点显着改变时，重新训练通道脉冲响应。

公开(公告)号：US07177377B2

公开(公告)日：2007-02-13

申请号：US10463143

申请日：2003-06-17

申请人： Kuo-Ming Wu ,  Hung-Kun Chen ,  Mao-Ching Chiu ,  Jui-Hsi Cheng

发明人： Kuo-Ming Wu ,  Hung-Kun Chen ,  Mao-Ching Chiu ,  Jui-Hsi Cheng

IPC分类号： H04B14/06

CPC分类号： C30B25/18 ,  H04L27/0014 ,  H04L2027/0065

摘要： An avoidance method for co-channel interference in a wireless network. The first step of the method is to evaluate an interference measure on each subcarrier. Based on the interference measure of each subcarrier, a peak-to-average measure ratio of interference within the received symbol is then obtained. If the peak-to-average measure ratio of interference is greater than a predetermined threshold, a most interfered subcarrier at which the maximal interference measure occurs is detected. Accordingly, a downgrading factor is set for the most interfered subcarrier.

摘要翻译： 一种用于无线网络中同信道干扰的回避方法。 该方法的第一步是评估每个子载波的干扰测量。 基于每个子载波的干扰测量，然后获得接收符号内的干扰的峰均平均测量比。 如果干扰的峰均平均测量比大于预定阈值，则检测发生最大干扰测量的最受干扰的子载波。 因此，对最受干扰的子载波设置降级因子。

公开(公告)号：US08107443B2

公开(公告)日：2012-01-31

申请号：US12368988

申请日：2009-02-10

申请人： Chao-Yu Chen ,  Chao-Ming Chang ,  Kuang-Jen Wang ,  Mao-Ching Chiu

发明人： Chao-Yu Chen ,  Chao-Ming Chang ,  Kuang-Jen Wang ,  Mao-Ching Chiu

IPC分类号： H04B7/216

CPC分类号： H04W48/20 ,  H04J11/0069

摘要： Performing cell search in a wireless communications system includes receiving a preamble signal, match filtering the preamble signal with a pseudo noise sequence to form a filtered preamble signal of a plurality of filtered preamble signals, choosing a largest filtered preamble signal from the plurality of filtered preamble signals, and determining an estimated pseudo noise sequence index and an estimated integer part frequency offset according to the largest filtered preamble signal.

摘要翻译： 在无线通信系统中执行小区搜索包括接收前同步信号，将前同步码信号与伪噪声序列进行匹配滤波，以形成多个滤波的前导信号的经滤波的前导信号，从多个滤波的前导码中选择最大滤波的前导信号 信号，以及根据最大滤波的前导信号确定估计的伪噪声序列索引和估计的整数部分频率偏移。

公开(公告)号：US20100203885A1

公开(公告)日：2010-08-12

申请号：US12368988

申请日：2009-02-10

申请人： Chao-Yu Chen ,  Chao-Ming Chang ,  Kuang-Jen Wang ,  Mao-Ching Chiu

发明人： Chao-Yu Chen ,  Chao-Ming Chang ,  Kuang-Jen Wang ,  Mao-Ching Chiu

IPC分类号： H04W4/00 ,  H04L27/06 ,  H04B1/10

CPC分类号： H04W48/20 ,  H04J11/0069

摘要： Performing cell search in a wireless communications system includes receiving a preamble signal, match filtering the preamble signal with a pseudo noise sequence to form a filtered preamble signal of a plurality of filtered preamble signals, choosing a largest filtered preamble signal from the plurality of filtered preamble signals, and determining an estimated pseudo noise sequence index and an estimated integer part frequency offset according to the largest filtered preamble signal.

摘要翻译： 在无线通信系统中执行小区搜索包括接收前同步信号，将前同步码信号与伪噪声序列进行匹配滤波，以形成多个滤波的前导信号的经滤波的前导信号，从多个滤波的前导码中选择最大滤波的前导信号 信号，以及根据最大滤波的前导信号确定估计的伪噪声序列索引和估计的整数部分频率偏移。

公开(公告)号：US07248627B2

公开(公告)日：2007-07-24

申请号：US10632902

申请日：2003-08-04

申请人： Mao-Ching Chiu

发明人： Mao-Ching Chiu

IPC分类号： H04B3/46 ,  H04B17/00

CPC分类号： H04L1/20 ,  H04L27/2647

摘要： A link quality estimating method and apparatus adopts a fading value to modify an estimated link quality of a channel thereby obtaining a measure being very close to the real link quality. The method is implemented by utilizing two sequentially received long training symbols to derive two sets of subcarrier gain values Hk,1 and Hk,2. Based on the subcarrier gain values Hk,1 and Hk,2, parameters representing the estimated channel gain value (A), the fading value (F) and the noise quantity (B) of the channel are all calculable. With these parameters, the link quality (LQ) of said communication channel is derived.

摘要翻译： 链路质量估计方法和装置采用衰落值来修改信道的估计链路质量，从而获得非常接近实际链路质量的度量。 该方法通过利用两个顺序接收的长训练符号来实现，以导出两组子载波增益值H k，1和H k，2 N。 基于子载波增益值H k，1和H k，2 N，表示估计的信道增益值（A），衰落值（F）和噪声 通道数量（B）均可计算。 利用这些参数，导出所述通信信道的链路质量（LQ）。

公开(公告)号：US07174146B2

公开(公告)日：2007-02-06

申请号：US10653300

申请日：2003-09-02

申请人： Kuo-Ming Wu ,  Jui-Hsi Cheng ,  Mao-Ching Chiu

发明人： Kuo-Ming Wu ,  Jui-Hsi Cheng ,  Mao-Ching Chiu

IPC分类号： H04B1/10

CPC分类号： H04L27/3863 ,  H04L27/2647

摘要： A method for I/Q mismatch calibration of a receiver having an I/Q correction module with correction parameters, comprising the steps of generating a test signal containing a single tone waveform with frequency of a carrier frequency plus a predetermined frequency, applying I/Q demodulation to reduce the central frequency of the test signal and outputting a demodulated signal, converting the demodulated signal to a digital signal, obtaining measures of the digital signal respectively indicative of the frequency response of the digital signal at the plus and minus predetermined frequencies, and calculating the set of the correction parameters for the I/Q correction module based on the measures.

摘要翻译： 一种用于具有具有校正参数的I / Q校正模块的接收机的I / Q失配校准的方法，包括以下步骤：产生包含具有载波频率加上预定频率的频率的单音波形的测试信号，应用I / Q 解调以减小测试信号的中心频率并输出解调信号，将解调信号转换成数字信号，获得分别表示数字信号在正，负预定频率下的频率响应的数字信号的测量值，以及 基于这些措施计算I / Q校正模块的校正参数的集合。

公开(公告)号：US20050026577A1

公开(公告)日：2005-02-03

申请号：US10628165

申请日：2003-07-28

申请人： Mao-Ching Chiu

发明人： Mao-Ching Chiu

IPC分类号： H04B1/12 ,  H04L27/00 ,  H04L27/26 ,  H04B1/00

CPC分类号： H04B1/123 ,  H04L27/2647 ,  H04L2027/0016 ,  H04L2027/0024

摘要： A method for I/Q mismatch calibration in a receiver. The receiver has an I/Q correction module using parameters Ap and Bp. The method comprises the steps of generating an analog test signal x(t), applying I/Q demodulation to reduce the central frequency of the signal x(t) by fc Hz and outputting a demodulated signal xdem(t), converting the analog signal xdem(t) to a digital signal xdem[n], sending the signal xdem[n] into the I/Q correction module using parameters Ap and Bp and outputting a corrected signal w[n], obtaining two measures U1 and U2 of the corrected signal w[n], and updating the parameters Ap and Bp of the I/Q correction module respectively by a first and second function of the two measures U1 and U2, and the current values of the parameters Ap and Bp.

摘要翻译： 一种接收机中I / Q不匹配校准的方法。 接收机具有使用参数Ap和Bp的I / Q校正模块。 该方法包括以下步骤：产生模拟测试信号x（t），施加I / Q解调以通过fc Hz减小信号x（t）的中心频率，并输出解调信号xdem（t），将模拟信号 xdem（t）到数字信号xdem [n]，使用参数Ap和Bp将信号xdem [n]发送到I / Q校正模块，并输出校正信号w [n]，获得两个测量值U1和U2 校正信号w [n]，并且分别通过两个测量值U1和U2的第一和第二函数以及参数Ap和Bp的当前值更新I / Q校正模块的参数Ap和Bp。