公开(公告)号：US07558338B2

公开(公告)日：2009-07-07

申请号：US10649862

申请日：2003-08-28

申请人： Der-Zheng Liu ,  Song-Nien Tung ,  Kuang-Yu Yen ,  Tai-Cheng Liu

发明人： Der-Zheng Liu ,  Song-Nien Tung ,  Kuang-Yu Yen ,  Tai-Cheng Liu

IPC分类号： H04L27/00

CPC分类号： H03D3/009 ,  H04B1/40 ,  H04L27/2627 ,  H04L27/2649 ,  H04L2027/0016 ,  H04L2027/0022

摘要： An apparatus and method for estimating an I/Q imbalance parameter of a receiver and a transmitter. An apparatus for estimating an I/Q imbalance parameter of a receiver, the apparatus comprising: a signal generator; a transmitter; a receiver; and an estimator. An apparatus for estimating an I/Q imbalance parameter of a transmitter, the apparatus comprising: a signal generator; a transmitter; and an estimator.

摘要翻译： 一种用于估计接收机和发射机的I / Q不平衡参数的装置和方法。 一种用于估计接收机的I / Q不平衡参数的装置，所述装置包括：信号发生器; 发射机 接收器 和一个估计。 一种用于估计发射机的I / Q不平衡参数的装置，所述装置包括：信号发生器; 发射机 和一个估计。

公开(公告)号：US07190929B2

公开(公告)日：2007-03-13

申请号：US10388675

申请日：2003-03-13

申请人： Tai-Cheng Liu

发明人： Tai-Cheng Liu

IPC分类号： H04B1/00 ,  H04B15/00 ,  H04B1/10 ,  H04B1/18

CPC分类号： H04B1/7117

摘要： The present invention is an assigning system and method for assigning a plurality of rake finger tracking units of a rake receiver in a Code Division Multiple Access (CDMA) communication system. The plurality of rake finger tracking units is used for tracking a plurality of path signal of each multipath signal by a plurality of corresponding predetermined tracking time positions. The assigning system and method estimate a plurality of corresponding tracking ranges of the plurality of path signals and compare the plurality of predetermined tracking time positions with the plurality of tracking ranges. If there is more than one predetermined tracking time positions in one tracking range, the assigning system assigns a rake finger tracking unit corresponding to one of the tracking time positions to track the path signal corresponding to the tracking range. If there is no predetermined tracking time position in the tracking range, the assigning system assigns an idle rake finger tracking unit to track the path signal corresponding to the tracking range. By the way, the present invention uses the rake finger tracking units of the rake receiver with the best efficiency to avoid the idle resources of the communication system.

摘要翻译： 本发明是一种用于在码分多址（CDMA）通信系统中分配耙式接收机的多个耙指跟踪单元的分配系统和方法。 多个耙指跟踪单元用于通过多个对应的预定跟踪时间位置跟踪每个多径信号的多个路径信号。 所述分配系统和方法估计所述多个路径信号的多个对应的跟踪范围，并将所述多个预定跟踪时间位置与所述多个跟踪范围进行比较。 如果在一个跟踪范围内存在多于一个预定的跟踪时间位置，则分配系统分配与跟踪时间位置之一相对应的耙指跟踪单元，以跟踪对应于跟踪范围的路径信号。 如果在跟踪范围内没有预定的跟踪时间位置，则分配系统分配空闲耙指跟踪单元来跟踪对应于跟踪范围的路径信号。 顺便提及，本发明以最好的效率利用耙机接收机的耙指跟踪单元来避免通信系统的空闲资源。

公开(公告)号：US07680197B2

公开(公告)日：2010-03-16

申请号：US10803047

申请日：2004-03-18

申请人： Der-Zheng Liu ,  Tai-Cheng Liu ,  Song-Nien Tung ,  Kuang-Yu Yen

发明人： Der-Zheng Liu ,  Tai-Cheng Liu ,  Song-Nien Tung ,  Kuang-Yu Yen

IPC分类号： H04K1/10 ,  H04L7/00

CPC分类号： H04L27/2662 ,  H04L27/2657 ,  H04L27/2675

摘要： The present invention provides an apparatus and an associated method for sampling timing compensation, which can estimate sampling frequency offset between the receiver and transmitter of a multi-carrier system according to estimated frequency responses of two consecutive received symbols within each pilot subchannel, and compensate an accumulated sampling timing offset resulted from the sampling frequency offset. When the accumulated timing offset is not large, the apparatus uses a phase rotator to compensate with a corresponding accumulated phase rotation in frequency domain. When the accumulated timing offset is large, the apparatus first compensates with a specific timing offset in time domain, and then uses the phase rotator to compensate with a phase rotation corresponding to the remaining timing offset in frequency domain. A timing controller is used to compensate with the specific timing offset by adjusting a clock generator or a cyclic prefix remover of the receiver.

摘要翻译： 本发明提供了一种用于采样定时补偿的装置和相关方法，其可以根据每个导频子信道内的两个连续接收符号的估计频率响应来估计多载波系统的接收机和发射机之间的采样频率偏移，并且对 采样频率偏移产生的累积采样定时偏移。 当累积的定时偏差不大时，该装置使用相位旋转器来对频域中相应的累积相位旋转进行补偿。 当累积的定时偏移量大时，装置首先用时域中的特定定时偏移补偿，然后使用相位旋转器对与频域中的剩余定时偏移相对应的相位旋转进行补偿。 定时控制器用于通过调整接收机的时钟发生器或循环前缀去除器来补偿特定的定时偏移。

公开(公告)号：US20090060006A1

公开(公告)日：2009-03-05

申请号：US11846521

申请日：2007-08-28

申请人： Tai-Cheng Liu ,  Hsuan-Yu Liu ,  Po-Yuen Cheng

发明人： Tai-Cheng Liu ,  Hsuan-Yu Liu ,  Po-Yuen Cheng

IPC分类号： H04B1/707

CPC分类号： H04L25/022 ,  H04L25/03828 ,  H04L27/2647

摘要： A receiver for receiving a target signal complying with a specific communication specification comprising a specific spectrum characteristic includes a detecting module for detecting a packet of an input signal, a transforming unit for transforming the packet from a time domain to a frequency domain to derive a spectrum characteristic of the input signal, and a determining unit for determining whether the input signal is the target signal according to the spectrum characteristic of the input signal. Therefore, the proposed receiver is able to reduce packet miss rate and false alarm rate while robust to a severe channel condition, and achieve fast and accurate signal quality detection.

摘要翻译： 用于接收符合包括特定频谱特性的特定通信规范的目标信号的接收机包括用于检测输入信号分组的检测模块，用于将分组从时域变换到频域的变换单元，以导出频谱 输入信号的特性;以及确定单元，用于根据输入信号的频谱特性确定输入信号是否为目标信号。 因此，所提出的接收机能够在恶劣的信道条件下稳定地降低分组丢失率和误报率，并且实现快速准确的信号质量检测。

公开(公告)号：US20050008088A1

公开(公告)日：2005-01-13

申请号：US10885186

申请日：2004-07-06

申请人： Der-Zheng Liu ,  Song-Nien Tang ,  Tai-Cheng Liu ,  Kuang-Yu Yen

发明人： Der-Zheng Liu ,  Song-Nien Tang ,  Tai-Cheng Liu ,  Kuang-Yu Yen

IPC分类号： H04L27/26 ,  H04K1/10

CPC分类号： H04L27/2662 ,  H04L27/2605 ,  H04L27/2675 ,  H04L27/2678

摘要： A symbol boundary detection device and a method thereof for use in a receiver of a multi-channel communication system. The device utilizes a threshold to make an auxiliary judgement so as to select a proper symbol boundary reference point within an early range. The threshold may be flexibly set in response to different characteristics of the systems. In addition, a pilot symbol guard interval matched filter is further utilized to determine whether a pilot symbol guard interval is received.

摘要翻译： 一种在多声道通信系统的接收机中使用的符号边界检测装置及其方法。 设备利用阈值进行辅助判断，以便在早期范围内选择适当的符号边界参考点。 可以响应于系统的不同特性灵活地设置阈值。 此外，进一步利用导频符号保护间隔匹配滤波器来确定是否接收到导频符号保护间隔。

公开(公告)号：US07860177B2

公开(公告)日：2010-12-28

申请号：US11846521

申请日：2007-08-28

申请人： Tai-Cheng Liu ,  Hsuan-Yu Liu ,  Po-Yuen Cheng

发明人： Tai-Cheng Liu ,  Hsuan-Yu Liu ,  Po-Yuen Cheng

IPC分类号： H04K1/10 ,  H04J11/00

CPC分类号： H04L25/022 ,  H04L25/03828 ,  H04L27/2647

摘要： A receiver for receiving a target signal complying with a specific communication specification comprising a specific spectrum characteristic includes a detecting module for detecting a packet of an input signal, a transforming unit for transforming the packet from a time domain to a frequency domain to derive a spectrum characteristic of the input signal, and a determining unit for determining whether the input signal is the target signal according to the spectrum characteristic of the input signal. Therefore, the proposed receiver is able to reduce packet miss rate and false alarm rate while robust to a severe channel condition, and achieve fast and accurate signal quality detection.

摘要翻译： 用于接收符合包括特定频谱特性的特定通信规范的目标信号的接收机包括用于检测输入信号分组的检测模块，用于将分组从时域变换到频域的变换单元，以导出频谱 输入信号的特性;以及确定单元，用于根据输入信号的频谱特性确定输入信号是否为目标信号。 因此，所提出的接收机能够在恶劣的信道条件下稳定地降低分组丢失率和误报率，并且实现快速准确的信号质量检测。

公开(公告)号：US20090207925A1

公开(公告)日：2009-08-20

申请号：US12031831

申请日：2008-02-15

申请人： Tai-Cheng Liu

发明人： Tai-Cheng Liu

IPC分类号： H04L27/28

CPC分类号： H04L27/2647 ,  H04B1/1036

摘要： A wireless communication system adapted for the IEEE 802.11 or IEEE 802.16 standard comprises a radio frequency (RF) receiver, an analog-to-digital converter (ADC), and an OFDM communication apparatus. The RF receiver receives a radio signal. The ADC converts the radio signal to a digital signal. The OFDM communication apparatus comprises a digital filter, a notch filter, a fast Fourier transform (FFT) processor, and a detection element. The digital filter processes the digital signal to generate a processed digital signal. The notch filter filters out interference of the processed signal to generate a notched signal according to a filter band. The FFT processor performs an FFT process on the notched signal to generate an FFT signal according to the processed digital signal. The detection element generates the filter band of the notch filter according to the FFT signal.

摘要翻译： 适用于IEEE 802.11或IEEE 802.16标准的无线通信系统包括射频（RF）接收机，模数转换器（ADC）和OFDM通信装置。 RF接收机接收无线电信号。 ADC将无线电信号转换为数字信号。 OFDM通信装置包括数字滤波器，陷波滤波器，快速傅里叶变换（FFT）处理器和检测元件。 数字滤波器处理数字信号以产生经处理的数字信号。 陷波滤波器滤除已处理信号的干扰，以根据滤波器频带产生陷波信号。 FFT处理器对陷波信号执行FFT处理，以根据处理的数字信号产生FFT信号。 检测元件根据FFT信号生成陷波滤波器的滤波器带。

公开(公告)号：US07391828B2

公开(公告)日：2008-06-24

申请号：US10885186

申请日：2004-07-06

申请人： Der-Zheng Liu ,  Song-Nien Tang ,  Tai-Cheng Liu ,  Kuang-Yu Yen

发明人： Der-Zheng Liu ,  Song-Nien Tang ,  Tai-Cheng Liu ,  Kuang-Yu Yen

IPC分类号： H04L27/06

CPC分类号： H04L27/2662 ,  H04L27/2605 ,  H04L27/2675 ,  H04L27/2678

摘要： A symbol boundary detection device and a method thereof for use in a receiver of a multi-channel communication system. The device utilizes a threshold to make an auxiliary judgement so as to select a proper symbol boundary reference point within an early range. The threshold may be flexibly set in response to different characteristics of the systems. In addition, a pilot symbol guard interval matched filter is further utilized to determine whether a pilot symbol guard interval is received.

摘要翻译： 一种在多声道通信系统的接收机中使用的符号边界检测装置及其方法。 设备利用阈值进行辅助判断，以便在早期范围内选择适当的符号边界参考点。 可以响应于系统的不同特性灵活地设置阈值。 此外，进一步利用导频符号保护间隔匹配滤波器来确定是否接收到导频符号保护间隔。

公开(公告)号：US20110134746A1

公开(公告)日：2011-06-09

申请号：US12962623

申请日：2010-12-07

申请人： Tai-Cheng Liu ,  Chi-Chen Lee ,  Ming-Chun Cheng ,  Chun-Jen Tsai ,  Chia-Ming Chang ,  Ching-Hwa Yu

发明人： Tai-Cheng Liu ,  Chi-Chen Lee ,  Ming-Chun Cheng ,  Chun-Jen Tsai ,  Chia-Ming Chang ,  Ching-Hwa Yu

IPC分类号： H04J3/10

CPC分类号： H04L1/0001 ,  H04L1/1829

摘要： A method of reducing interference between two communication systems operating in adjacent frequency bands and coexisting in a communication device is provided, and the two communication systems are a first communication system using TDD and a second communication system which is content-based. The method includes deciding whether to perform an arbitration procedure on a downlink subframe of the first communication system according to a CINR of the first communication system and a RSSI of the second communication system; deciding whether to perform the arbitration procedure on an uplink subframe of the first communication system according to a transmit power of the first communication system and a RSSI value of the second communication system; and when deciding to perform the arbitration procedure on the downlink or uplink subframe, further deciding whether to send a specific packet to request one or more stations not to send packets to the second communication system.

摘要翻译： 提供了减少在相邻频带中工作并且在通信设备中共存的两个通信系统之间的干扰的方法，并且两个通信系统是使用TDD的第一通信系统和基于内容的第二通信系统。 该方法包括根据第一通信系统的CINR和第二通信系统的RSSI来决定是否对第一通信系统的下行链路子帧执行仲裁过程; 根据所述第一通信系统的发送功率和所述第二通信系统的RSSI值来决定是否对所述第一通信系统的上行链路子帧执行所述仲裁过程; 并且当决定在下行链路或上行链路子帧上执行仲裁过程时，进一步决定是否发送特定分组以请求一个或多个站不向第二通信系统发送分组。

公开(公告)号：US07684501B2

公开(公告)日：2010-03-23

申请号：US10779648

申请日：2004-02-18

申请人： Der-Zheng Liu ,  Song-Nien Tung ,  Tai-Cheng Liu ,  Kuang-Yu Yen

发明人： Der-Zheng Liu ,  Song-Nien Tung ,  Tai-Cheng Liu ,  Kuang-Yu Yen

IPC分类号： H04K1/10

CPC分类号： H04L27/2657 ,  H04L27/266 ,  H04L27/2675 ,  H04L27/2695

摘要： The present invention provides apparatus and methods for carrier frequency offset and phase compensation, which can compensate the phase rotation of an OFDM symbol resulted from carrier frequency offset between the receiver and transmitter of an OFDM System. The apparatus and method for carrier frequency offset compensation generates an estimated carrier frequency offset according to a phase error between estimated frequency responses of two consecutive received OFDM symbols within the pilot subchannel, and calculates an accumulated phase rotation, according to the estimated carrier frequency offset, for compensating the received OFDM symbol. On the other hand, the apparatus and method for phase compensation generates an estimated residual phase error according to the pilot signal of a frequency offset-compensated OFDM symbol and the original pilot signal transmitted by the transmitter, and compensates the frequency offset-compensated OFDM symbol or a following one according to the estimated residual phase error.

摘要翻译： 本发明提供了用于载波频率偏移和相位补偿的装置和方法，其可以补偿由OFDM系统的接收机和发射机之间的载波频率偏移导致的OFDM符号的相位旋转。 用于载波频率补偿的装置和方法根据导频子信道内的两个连续接收的OFDM符号的估计频率响应之间的相位误差产生估计的载波频率偏移，并且根据所估计的载波频率偏移来计算累积的相位旋转， 用于补偿接收到的OFDM符号。 另一方面，用于相位补偿的装置和方法根据频偏补偿OFDM符号的导频信号和由发射机发送的原始导频信号产生估计的残余相位误差，并且补偿频偏补偿的OFDM符号 或根据估计的残余相位误差的后一个。