专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

111. 发明授权

US08605835B2 Receiver device, integrated circuit, receiving method, and receiving program 有权
标题翻译：接收设备，集成电路，接收方式和接收程序
公开(公告)号：US08605835B2
公开(公告)日：2013-12-10
申请号：US13060534
申请日：2010-06-23
申请人： Yoshinobu Matsumura
发明人： Yoshinobu Matsumura
IPC分类号： H04L27/06 , H04L27/00 , H03K9/00 , H03K9/06 , H04J1/00
CPC分类号： H04L27/2659 , H04L27/2666 , H04L27/2672 , H04L27/2675 , H04L27/2676
摘要： A wideband carrier frequency error calculator that, for each of a plurality of location patterns, calculates a cumulative value through a predetermined process performed on signals output by an orthogonal transformer for a plurality of sub-carrier positions determined according to a given location pattern while simultaneously shifting the signals output therefrom by one sub-carrier unit along the carrier direction and that also calculates wideband carrier frequency error according to carrier direction discrepancies calculated as maximum values within the cumulative value, and a carrier frequency error corrector that applies corrections to carrier frequency discrepancies according to the wideband carrier frequency error so calculated.
摘要翻译：一种宽带载波频率误差计算器，对于多个位置模式中的每一个，通过对由正交变换器输出的信号执行的预定处理来计算累积值，所述信号对于根据给定位置模式确定的多个副载波位置同时沿着载波方向将由一个子载波单元输出的信号移位，并且还根据作为累积值内的最大值计算的载波方向差异来计算宽带载波频率误差，以及对载波频率差异进行校正的载波频率误差校正器根据宽带载波频率误差如此计算。

112. 发明授权

US08594607B2 Methods and systems for down-converting a signal using a complementary transistor structure 失效
标题翻译：使用互补晶体管结构对信号进行下变频的方法和系统
公开(公告)号：US08594607B2
公开(公告)日：2013-11-26
申请号：US13428816
申请日：2012-03-23
申请人： David F. Sorrells , Michael J. Bultman , Robert W. Cook , Richard C. Looke , Charley D. Moses, Jr.
发明人： David F. Sorrells , Michael J. Bultman , Robert W. Cook , Richard C. Looke , Charley D. Moses, Jr.
IPC分类号： H04B1/26
CPC分类号： H04L27/3881 , H03C1/62 , H03D7/00 , H03D7/1441 , H03D7/1475 , H04B1/0025 , H04B1/16 , H04B1/28 , H04B7/12 , H04L25/08 , H04L27/00 , H04L27/06 , H04L27/12 , H04L27/14 , H04L27/148 , H04L27/156 , H04L27/2672
摘要： Methods, systems, and apparatuses for down-converting an electromagnetic (EM) signal by aliasing the EM signal are described herein. Such methods, systems, and apparatuses operate by receiving an EM signal and an aliasing signal having an aliasing rate. The EM signal is aliased according to the aliasing signal to down-convert the EM signal. The term aliasing, as used herein, refers to both down-converting an EM signal by under-sampling the EM signal at an aliasing rate, and down-converting an EM signal by transferring energy from the EM signal at the aliasing rate. In an embodiment, the EM signal is down-converted to an intermediate frequency (IF) signal. In another embodiment, the EM signal is down-converted to a emodulated baseband information signal. In another embodiment, the EM signal is a frequency modulated (FM) signal, which is down-converted to a non-FM signal, such as a phase modulated (PM) signal or an amplitude modulated (AM) signal.
摘要翻译：这里描述了通过使EM信号进行混叠来降低电磁（EM）信号的转换的方法，系统和装置。这样的方法，系统和装置通过接收具有混叠速率的EM信号和混叠信号来操作。 EM信号根据混叠信号进行混叠，以降低EM信号的转换。如本文所使用的，术语混叠是指通过以混叠速率对EM信号进行欠采样，并以混叠速率从EM信号传输能量来对EM信号进行下变频来对EM信号进行下变频。在一个实施例中，EM信号被下变频到中频（IF）信号。在另一个实施例中，EM信号被下变频为被仿真的基带信息信号。在另一个实施例中，EM信号是频率调制（FM）信号，其被下变频成非FM信号，例如相位调制（PM）信号或幅度调制（AM）信号。

113. 发明申请

US20130301400A1 System Access and Synchronization Methods for MIMO OFDM Communications Systems and Physical Layer Packet and Preamble Design 有权
标题翻译： MIMO OFDM通信系统和物理层分组和前导码设计的系统接入和同步方法
公开(公告)号：US20130301400A1
公开(公告)日：2013-11-14
申请号：US13944398
申请日：2013-07-17
申请人： Apple Inc.
发明人： Jianglei Ma , Ming Jia , Peiying Zhu , Wen Tong
IPC分类号： H04L27/26
CPC分类号： H04W36/08 , H04B7/022 , H04B7/04 , H04B7/0413 , H04B7/0667 , H04B7/0697 , H04J11/0069 , H04L5/0023 , H04L5/0037 , H04L5/0048 , H04L7/0008 , H04L27/2602 , H04L27/2607 , H04L27/2613 , H04L27/2627 , H04L27/2628 , H04L27/2663 , H04L27/2665 , H04L27/2672 , H04L27/2675
摘要： A method and apparatus are provided for performing acquisition, synchronization and cell selection within an MIMO-OFDM communication system. A coarse synchronization is performed to determine a searching window. A fine synchronization is then performed by measuring correlations between subsets of signal samples, whose first signal sample lies within the searching window, and known values. The correlations are performed in the frequency domain of the received signal. In a multiple-output OFDM system, each antenna of the OFDM transmitter has a unique known value. The known value is transmitted as pairs of consecutive pilot symbols, each pair of pilot symbols being transmitted at the same subset of sub-carrier frequencies within the OFDM frame.
摘要翻译：提供了一种用于在MIMO-OFDM通信系统内执行采集，同步和小区选择的方法和装置。执行粗同步以确定搜索窗口。然后通过测量其第一信号样本位于搜索窗口内的信号样本的子集与已知值之间的相关性来执行精细同步。相关性在接收信号的频域中进行。在多输出OFDM系统中，OFDM发射机的每个天线具有唯一的已知值。已知值作为连续导频符号对发送，每对导频符号在OFDM帧内的子载波频率的相同子集上发送。

114. 发明授权

US08582634B2 OFDM signal demodulation method and device thereof 有权
标题翻译： OFDM信号解调方法及其装置
公开(公告)号：US08582634B2
公开(公告)日：2013-11-12
申请号：US13259038
申请日：2010-04-23
申请人： Qiang Li , Ning Qiu , Nanshan Cao
发明人： Qiang Li , Ning Qiu , Nanshan Cao
IPC分类号： H04L27/06 , H04L27/01
CPC分类号： H04L25/03159 , H04L25/0216 , H04L25/022 , H04L27/2607 , H04L27/2657 , H04L27/2665 , H04L27/2672 , H04L27/2676 , H04L27/2695 , H04L2025/03414
摘要： The present invention discloses an OFDM signal demodulation method and device thereof. The method comprises: adding a pre-obtained timing offset estimation value of an OFDM signal demodulation device to the initial position of an OFDM symbol of a received signal to obtain a window deviation value of the OFDM symbol; adding a channel time delay extension to the window deviation value to obtain a combined prefix initial position; calculating the combined OFDM signal value starting from the prefix initial position; processing the Fast Fourier Transform (FFT) for the combined OFDM signal value to obtain a frequency domain data subcarrier signal; calculating the frequency domain original channel estimation value processing the channel estimation based on the original channel estimation value phase modification of the OFDM symbol according to the channel estimation compensation indication value; and processing equalization and detection for the frequency domain data subcarrier signal according to the channel estimation result. The present invention uses the cycle prefix of the received signals to promote the demodulation performance of the OFDM signal demodulation device.
摘要翻译：本发明公开了一种OFDM信号解调方法及其装置。该方法包括：将预先获得的OFDM信号解调装置的定时偏移估计值加到接收信号的OFDM符号的初始位置，以获得OFDM符号的窗口偏移值; 向窗口偏差值增加一个通道时间延迟以获得组合的前缀初始位置; 从前缀初始位置开始计算组合的OFDM信号值; 处理用于组合的OFDM信号值的快速傅立叶变换（FFT）以获得频域数据子载波信号; 根据信道估计补偿指示值，根据OFDM符号的原始信道估计值相位修正来计算频域原始信道估计值处理信道估计值; 以及根据信道估计结果处理频域数据子载波信号的均衡和检测。本发明使用接收信号的周期前缀来促进OFDM信号解调装置的解调性能。

115. 发明申请

US20130266056A1 METHOD OF ESTIMATING SAMPLING CLOCK OFFSET, A SAMPLING CLOCK OFFSET ESTIMATOR AND A RECEIVER COMPRISING THE SAME 有权
标题翻译：估计采样时钟偏移的方法，采样时钟偏移估计器和包含其的接收器
公开(公告)号：US20130266056A1
公开(公告)日：2013-10-10
申请号：US13856970
申请日：2013-04-04
申请人： GREENVITY COMMUNICATIONS, INC.
发明人： Rui Zhang , Hung C. Nguyen
IPC分类号： H04L27/34
CPC分类号： H04L27/3455 , H04L1/0047 , H04L1/0066 , H04L1/0071 , H04L27/2663 , H04L27/2672 , H04L27/2675 , H04L27/2679 , H04L27/34
摘要： A SCO estimator comprises the following units. A module obtains a first data output by a first unit and copies the first data to obtain copied data. A QAM unit quadrature modulates the copied data into each sub-carrier of each OFDM symbol to regenerate transmitted modulated data. A first phase unit obtains a first phase of each sub-carrier of each OFDM symbol of the modulated data. A second phase unit obtains a second data from a second unit, and obtains a second phase of each sub-carrier of each OFDM symbol of the second data. A comparator generates a comparing result according to the first phase and the second phase of each sub-carrier of each OFDM symbol. A divider divides the comparing result of each sub-carrier by the subcarrier index within each OFDM symbol and the OFDM symbol index of each OFDM symbol. An averaging unit averages the divided comparing result over number of sub-carriers and number of OFDM symbols.
摘要翻译： SCO估计器包括以下单元。模块获得由第一单元输出的第一数据，并复制第一数据以获得复制的数据。 QAM单元将复制的数据正交调制成每个OFDM符号的每个子载波以再生发送的调制数据。第一相位单元获得调制数据的每个OFDM符号的每个子载波的第一相位。第二相位单元从第二单元获得第二数据，并且获得第二数据的每个OFDM符号的每个子载波的第二相位。比较器根据每个OFDM符号的每个子载波的第一相位和第二相位产生比较结果。分频器将每个子载波的比较结果除以每个OFDM符号内的子载波索引和每个OFDM符号的OFDM符号索引。平均单元对分包的子载波数和OFDM符号数进行平均。

116. 发明授权

US08520778B2 System and method for estimation and correction of carrier frequency offset in MIMO-OFDM based wireless communications systems 有权
标题翻译：用于基于MIMO-OFDM的无线通信系统中的载波频率偏移的估计和校正的系统和方法
公开(公告)号：US08520778B2
公开(公告)日：2013-08-27
申请号：US12989517
申请日：2009-04-22
申请人： Saheerudeen Mohammed Sameer , Ratnam Varada Rajakumar
发明人： Saheerudeen Mohammed Sameer , Ratnam Varada Rajakumar
IPC分类号： H04L27/00 , H04L1/02 , H04B7/08
CPC分类号： H04L27/2684 , H04L1/0618 , H04L27/2659 , H04L27/266 , H04L27/2672 , H04L27/2676 , H04L27/2686
摘要： This invention relates to a Multi-Input Multi-Output Orthogonal Frequency Divisional Multiplexing (MIMO-OFDM) is a transmission technology for many current and next generation wireless communication systems. Carrier Frequency Offset (CFO) Estimation and Correction is one of the most important requirement of the proper reception of MIMO-OFDM Signals. The invention provides a null subcarrier based scheme to accomplish this task. The CFO is estimated by employing the covariance matrix of the signals on all receiving antennas with a cost function which minimizes the energy falling on the null subcarrier locations due to frequency offset. The proposed approach results in very low computational complexity as it uses a two step procedure, making it very attractive for real time applications. Also a new null subcarrier allocation scheme based on Fibonacci series is proposed which ensures a frequency offset estimation range equal to the maximum possible range equal to the OFDM bandwidth.
摘要翻译：多输入多输出正交频分复用（MIMO-OFDM）技术领域本发明涉及许多当前和下一代无线通信系统的传输技术。载波频偏（CFO）估计和校正是正确接收MIMO-OFDM信号的最重要的要求之一。本发明提供了一种基于空子载波的方案来完成该任务。通过使用所有接收天线上的信号的协方差矩阵来估计CFO，其具有使由于频率偏移而落在无效副载波位置上的能量最小化的成本函数。所提出的方法导致非常低的计算复杂度，因为它使用两步程序，使其对于实时应用非常有吸引力。另外，提出了一种基于斐波纳契系列的新的无效副载波分配方案，确保频偏估计范围等于等于OFDM带宽的最大可能范围。

117. 发明授权

US08520777B2 Operation of user equipment when control and data information are supplied by different radio units 有权
标题翻译：控制和数据信息由不同的无线电单元提供时，用户设备的操作
公开(公告)号：US08520777B2
公开(公告)日：2013-08-27
申请号：US13033722
申请日：2011-02-24
申请人： Bengt Lindoff , Fredrik Nordström
发明人： Bengt Lindoff , Fredrik Nordström
IPC分类号： H04L27/00
CPC分类号： H04L27/2657 , H04L5/005 , H04L5/0051 , H04L25/0204 , H04L25/0224 , H04L27/2662 , H04L27/2672 , H04L27/2675 , H04L27/2695 , H04W56/001 , H04W56/0035
摘要： A receiver operates in a mobile communication system that comprises first node and second nodes, the first and second nodes transmitting common control signals and dedicated data signals, respectively. The receiver determines a first timing rotation and/or a first frequency rotation of the common control signals and a second timing rotation and/or a second frequency rotation of the dedicated data signals. The receiver determines a first and/or second difference, wherein the first difference is a difference between the first timing rotation of the common control signals and the second timing rotation of the dedicated data signals and the second difference is a difference between the first frequency rotation of the common control signals and the second frequency rotation of the dedicated data signals. An adapted timing of dedicated data signals is produced based on the first and/or second differences, and the adapted timing is used to receive dedicated data signals.
摘要翻译：接收机在包括第一节点和第二节点的移动通信系统中操作，第一和第二节点分别发送公共控制信号和专用数据信号。接收机确定公共控制信号的第一定时旋转和/或第一频率旋转以及专用数据信号的第二定时旋转和/或第二频率旋转。接收机确定第一和/或第二差异，其中第一差是公共控制信号的第一定时旋转和专用数据信号的第二定时旋转之间的差，第二差是第一频率旋转的公共控制信号和专用数据信号的第二频率旋转。基于第一和/或第二差产生专用数据信号的适应定时，并且使用适配的定时来接收专用数据信号。

118. 发明申请

US20130163693A1 ESTIMATING FREQUENCY-OFFSETS AND MULTI-ANTENNA CHANNELS IN MIMO OFDM SYSTEMS 有权
标题翻译：估计MIMO OFDM系统中的频率偏移和多天线信道
公开(公告)号：US20130163693A1
公开(公告)日：2013-06-27
申请号：US13777993
申请日：2013-02-26
申请人： Regents of the University of Minnesota
发明人： Georgios B. Giannakis , Xiaoli Ma
IPC分类号： H04L27/26
CPC分类号： H04J11/0063 , H04B7/0413 , H04B7/046 , H04B7/063 , H04B7/066 , H04L5/0016 , H04L25/0202 , H04L25/0206 , H04L25/0228 , H04L25/0242 , H04L27/2607 , H04L27/2613 , H04L27/2626 , H04L27/2657 , H04L27/2671 , H04L27/2672 , H04L27/2675 , H04L27/2692 , H04L27/2695
摘要： Techniques are described for carrier frequency offset (CFO) and channel estimation of orthogonal frequency division multiplexing (OFDM) transmissions over multiple-input multiple-output (MIMO) frequency-selective fading channels. A wireless transmitter forms blocks of symbols by inserting training symbols within two or more blocks of information-bearing symbols. The transmitter appliex a hopping code to each of the blocks of symbols to insert a null subcarrier at a different position within each of the blocks of symbols, and a modulator outputs a wireless signal in accordance with the blocks of symbols. A receiver receives the wireless signal and estimates the CFO, and outputs a stream of estimated symbols based on the estimated CFO.
摘要翻译：描述了用于载波频率偏移（CFO）和通过多输入多输出（MIMO）频率选择性衰落信道的正交频分复用（OFDM）传输的信道估计的技术。无线发射器通过在两个或更多个信息承载符号块内插入训练符号来形成符号块。发射机对每个符号块应用跳频码，以在每个符号块内的不同位置插入空子载波，并且调制器根据符号块输出无线信号。接收器接收无线信号并估计CFO，并且基于估计的CFO输出估计符号流。

119. 发明授权

US08447005B2 Frequency synchronization methods and apparatus 有权
标题翻译：频率同步方法和装置
公开(公告)号：US08447005B2
公开(公告)日：2013-05-21
申请号：US12612800
申请日：2009-11-05
申请人： Joakim Axmon , Bengt Lindoff
发明人： Joakim Axmon , Bengt Lindoff
IPC分类号： H04L7/00
CPC分类号： H04L7/042 , H04J11/0069 , H04J13/0062 , H04L27/2657 , H04L27/2671 , H04L27/2672 , H04L27/2675 , H04L27/2686
摘要： Methods and apparatus for have frequency offset estimation and cell search in radio communication systems take into account the time-frequency correlation properties of reference and synchronization signals in such systems. This reduces the probability of misdetection of the physical layer cell ID and frequency offset by accounting for time-frequency ambiguities and evaluating correlation signal peaks in the frequency domain, saving signal processing time and making initial cell search considerably faster. Also, lower-grade and hence cheaper oscillators can be used without causing problems in the user's experience with a receiver, such as a cellular telephone.
摘要翻译：在无线电通信系统中进行频偏估计和小区搜索的方法和装置考虑了这种系统中参考和同步信号的时频相关特性。这通过考虑时间频率模糊度和评估频域中的相关信号峰值来降低物理层小区ID和频率偏移的错误检测的可能性，从而节省信号处理时间并使得初始小区搜索更快。此外，可以使用较低等级且因此更便宜的振荡器，而不会在诸如蜂窝电话之类的接收机的用户体验中引起问题。

120. 发明授权

US08441918B2 System access and synchronization methods for MIMO OFDM communications systems and physical layer packet and preamble design 有权
公开(公告)号：US08441918B2
公开(公告)日：2013-05-14
申请号：US13204238
申请日：2011-08-05
申请人： Jianglei Ma , Ming Jia , Peiying Zhu , Wen Tong
发明人： Jianglei Ma , Ming Jia , Peiying Zhu , Wen Tong
IPC分类号： H04J11/00
CPC分类号： H04W36/08 , H04B7/022 , H04B7/04 , H04B7/0413 , H04B7/0667 , H04B7/0697 , H04J11/0069 , H04L5/0023 , H04L5/0037 , H04L5/0048 , H04L7/0008 , H04L27/2602 , H04L27/2607 , H04L27/2613 , H04L27/2627 , H04L27/2628 , H04L27/2663 , H04L27/2665 , H04L27/2672 , H04L27/2675
摘要： A method and apparatus are provided for performing acquisition, synchronization and cell selection within an MIMO-OFDM communication system. A coarse synchronization is performed to determine a searching window. A fine synchronization is then performed by measuring correlations between subsets of signal samples, whose first signal sample lies within the searching window, and known values. The correlations are performed in the frequency domain of the received signal. In a multiple-output OFDM system, each antenna of the OFDM transmitter has a unique known value. The known value is transmitted as pairs of consecutive pilot symbols, each pair of pilot symbols being transmitted at the same subset of sub-carrier frequencies within the OFDM frame.

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式