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公开(公告)号：US20190097862A1
公开(公告)日：2019-03-28
申请号：US15527289
申请日：2015-11-17
申请人： LG ELECTRONICS INC.
发明人： Kilbom LEE , Wookbong LEE , Eunsung PARK , Hangyu CHO , Jiwon KANG
IPC分类号： H04L27/26 , H04L27/227
CPC分类号： H04L27/2676 , H04L5/0007 , H04L5/001 , H04L27/0014 , H04L27/227 , H04L27/2657 , H04L2027/0026
摘要： Disclosed is a CFO estimation method, which generates a first function defined by a received signal of two sequential OFDM symbols for a specific subcarrier, generates a second function defined on the basis of signs and magnitudes of a real number part and an imaginary number part of the first function, repeats the steps of generating the first function and the second function for all of a subcarrier set, and determines, as a residual CFO, a phase of a third function obtained by adding up the results of the repetition.
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公开(公告)号：US10063368B2
公开(公告)日：2018-08-28
申请号：US15642571
申请日：2017-07-06
发明人： Shinichi Morisaka
CPC分类号： H04L7/0331 , H03B21/01 , H03L7/06 , H03L7/091 , H03L7/099 , H03L7/16 , H03L7/185 , H03L2207/50 , H04B1/40 , H04B1/403 , H04L5/0007 , H04L27/00 , H04L2027/0024 , H04L2027/0026 , H04L2027/0053 , H04L2027/0065
摘要： A phase locked loop circuit that is capable of stabilizing a frequency of an input signal even in the case where the frequency is unstable is provided. The phase locked loop circuit that corrects a frequency error of an output signal from an oscillator to a predetermined target frequency; an ADC that converts the output signal to a digital signal; reference frequency output means that outputs a reference frequency signal; frequency error detection means that detects the frequency error based on the digital signal and the reference frequency signal; correction signal generation means that generates an error correction signal based on the frequency error; a DAC that converts the error correction signal to an analog signal; and a multiplier that multiplies the output signal by the analog signal to correct the frequency error of the output signal.
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3.发明申请公开(公告)号：US20180097917A1
公开(公告)日：2018-04-05
申请号：US15821597
申请日：2017-11-22
申请人： NEWRACOM, INC.
发明人： Heejung YU , Daewon LEE , Young Hoon KWON , Sungho MOON , Yujin NOH
CPC分类号： H04L69/321 , H04L1/08 , H04L5/0044 , H04L5/0046 , H04L5/0048 , H04L27/2338 , H04L27/26 , H04L27/2634 , H04L27/2646 , H04L69/323 , H04L2027/0026
摘要： A method for transmitting a frame is provided by a device in a wireless communication network. The device compensates a carrier frequency using a value of carrier frequency offset (CFO), and transmits a frame with the compensated carrier frequency to a receiver. The value of the CFO is indicated in TXVECTOR. A method for transmitting a frame is provided by a device in a wireless communication network. The device allocates data tones for a last symbol based on a payload size, generates the last symbol having repeated waveforms and transmits a frame including at least one period waveform of the repeated waveforms in the last symbol.
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公开(公告)号：US20170353912A1
公开(公告)日：2017-12-07
申请号：US15524580
申请日：2015-08-18
IPC分类号： H04W48/12 , H04W72/04 , H04W56/00 , H04W48/08 , H04W48/16 , H04L27/00 , H04L27/26 , H04W74/02 , H04W16/14
CPC分类号： H04W48/12 , H04L5/001 , H04L5/0032 , H04L5/0048 , H04L5/0094 , H04L27/0006 , H04L27/2646 , H04L27/2673 , H04L2027/0026 , H04W16/14 , H04W48/08 , H04W48/16 , H04W56/00 , H04W56/001 , H04W72/042 , H04W74/02
摘要： The present invention relates to a terminal device adapted to perform Licensed Assisted Access, LAA, synchronization and cell discovery, and data reception and transmission on a licensed carrier and on an unlicensed carrier. The terminal device comprises a reception unit adapted to receive, on the licensed carrier, control information message. The control information message includes synchronization and discovery signal information indicating the position of a synchronization and discovery signal on the unlicensed carrier. The reception unit of the terminal device can receive, on the unlicensed carrier at the position indicated by the synchronization and discovery signal information, the synchronization and discovery signal. A timing unit adjusts the timing for transmission and reception of data according to the received synchronization and discovery signal.
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公开(公告)号：US20170324602A1
公开(公告)日：2017-11-09
申请号：US15487937
申请日：2017-04-14
发明人： Sujit JOS , Kiran BYNAM , Jinesh P NAIR , Ashutosh Deepak GORE , Chandrashekhar Thejaswi PS , Chang Soon PARK , Young Jun HONG , Youngsoo KIM
CPC分类号： H04L27/2657 , H04L25/022 , H04L27/0014 , H04L2027/0026 , H04L2027/003
摘要： A method to compensate a carrier frequency offset (CFO) in a receiver is disclosed. The method includes receiving discrete time samples, obtaining a sample vector from the received discrete time samples, obtaining tentative CFO estimates based on the sample vector, selecting a CFO having a greatest compensation coefficient from the tentative CFO estimates, and compensating the CFO in the received discrete time samples.
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6.发明申请公开(公告)号：US20170279645A1
公开(公告)日：2017-09-28
申请号：US15510754
申请日：2014-09-12
发明人： Qiuyan Lu
IPC分类号： H04L27/00
CPC分类号： H04L27/0014 , H04L27/00 , H04L2027/0026
摘要： Disclosed are a frequency offset estimation method and apparatus in an optical transmission network and a storage medium. The method comprises: acquiring a data symbol to be frequency offset estimated, and eliminating a noise phase, a phase generated by a light source and an information phase in the data symbol to be frequency offset estimated; and performing a correlation operation on a data symbol with a set interval in the data symbol after the elimination processing and using a correlation operation result to determine a frequency offset estimation value.
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公开(公告)号：US09712317B2
公开(公告)日：2017-07-18
申请号：US14918284
申请日：2015-10-20
发明人： Manolis Frantzeskakis , Dong-U Lee , Divyanshu Jain , Jianhua Gan , Shengyang Xu
CPC分类号： H04B5/0031 , H04L27/0014 , H04L2027/0026 , H04L2027/0055 , H04L2027/0067
摘要： In some aspects, the disclosure is directed to methods and systems for carrier synchronization in active load modulation for near field communications. A broadcast carrier is received from a remote device and mixed with a locally-generated carrier and modulated data. A carrier synchronization circuit synchronizes the locally-generated carrier with the broadcast carrier based on an identified phase error from a double Cartesian-to-polar mapping of the mixed locally-generated carrier and broadcast carrier. In some implementations, the system also includes a modulation suppression circuit for providing unmodulated carrier signals to the carrier synchronization circuit or suppressing modulation distortion to maintain frequency and phase tracking despite the presence of data.
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公开(公告)号：US20160294504A1
公开(公告)日：2016-10-06
申请号：US15086414
申请日：2016-03-31
发明人： Oktay Ureten , Trevor Noel Yensen
CPC分类号： H04K3/44 , H04L27/0012 , H04L27/0014 , H04L2027/0026
摘要： A method for pre-processing a signal prior to classification, where the signal includes non-contiguous segments; the method includes applying a coarse carrier frequency offset correction, applying a phase correction, applying a residual course frequency offset correction, and outputting a simulated continuous signal consisting of recorded continuous signal segments and modeled non-contiguous segments. A system for implementing the method is also disclosed.
摘要翻译： 一种用于在分类之前预处理信号的方法，其中所述信号包括不连续的段; 所述方法包括应用粗略载波频率偏移校正，应用相位校正，应用残余路线频率偏移校正，以及输出由记录的连续信号段和建模的非连续段组成的模拟连续信号。 还公开了一种用于实现该方法的系统。
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9.发明申请METHOD AND APPARATUS FOR PERFORMING CELL SEARCH AND FREQUENCY OFFSET ESTIMATION 有权用于执行细胞搜索和频率偏移估计的方法和装置公开(公告)号：US20160234761A1
公开(公告)日：2016-08-11
申请号：US14750413
申请日：2015-06-25
发明人： Dah-Hae CHONG , Ho-II KIM , Soo-Bok YEO , Min-Goo KIM , Chae-Hag YI
CPC分类号： H04L25/024 , H04J11/0069 , H04L27/0014 , H04L2027/0026
摘要： Methods and apparatuses are provided for performing a cell search by a receiver in a communication system. A scrambling code is identified by correlating a common pilot channel with a first synchronization accumulation length based on a frame boundary and a code group. A multipath signal is sought by correlating the common pilot channel with a second synchronization accumulation length based on the frame boundary and the code group. A difference between, or a ratio of, a first maximum value of first correlation values acquired during identification of the scrambling code and a second maximum value of second correlation values acquired during searching for the multipath signal, is determined. It is determined whether a frequency offset exists by comparing the difference or the ratio with a predetermined threshold value. The frequency offset is estimated and the frequency offset is transmitted to a demodulator, when the frequency offset exists.
摘要翻译： 提供了用于在通信系统中由接收机执行小区搜索的方法和装置。 通过基于帧边界和码组将公共导频信道与第一同步累加长度相关联来识别扰码。 通过基于帧边界和代码组将公共导频信道与第二同步累加长度相关联来寻求多径信号。 确定在识别扰码期间获取的第一相关值的第一最大值与在搜索多路径信号期间获取的第二相关值的第二最大值之间的差异或比率。 通过将差异或比率与预定阈值进行比较来确定是否存在频率偏移。 当频率偏移存在时，估计频率偏移并将频率偏移传输到解调器。
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公开(公告)号：US20160043824A1
公开(公告)日：2016-02-11
申请号：US14456493
申请日：2014-08-11
CPC分类号： H04J3/1694 , H04B1/7073 , H04B1/7087 , H04L25/0224 , H04L25/0232 , H04L27/0014 , H04L2027/0026 , H04L2027/0065 , H04L2027/0085 , H04W56/0035 , H04W72/0446 , H04W72/0453
摘要： Apparatus, methods, and computer program product for data-aided frequency estimation in time division synchronous code division multiple access (TD-SCDMA) include receiving, in a downlink time slot of a TD-SCDMA network, a first data burst before a midamble, the midamble, and a second data burst after the midamble; determining at least one data segment that includes symbols in one or both of the first data burst and the second data burst, where the at least one data segment includes a data segment with fewer symbols than a union of the first data burst and the second data burst; and determining a frequency estimate based on the data segment.
摘要翻译： 在时分同步码分多址（TD-SCDMA）中用于数据辅助频率估计的装置，方法和计算机程序产品包括在TD-SCDMA网络的下行时隙中接收第一数据脉冲串， 中间码和中间码之后的第二数据脉冲串; 确定包括所述第一数据脉冲串和所述第二数据脉冲串中的一个或两者中的符号的至少一个数据段，其中所述至少一个数据段包括具有比所述第一数据脉冲串和所述第二数据脉冲串的联合更少的符号的数据段 爆裂; 以及基于所述数据段确定频率估计。
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