公开(公告)号：US20160381581A1

公开(公告)日：2016-12-29

申请号：US14835437

申请日：2015-08-25

申请人： FREESCALE SEMICONDUCTOR, INC.

发明人： MIHAI-IONUT STANCIU ,  RAJA V. TAMMA ,  KHURRAM WAHEED

IPC分类号： H04W24/08 ,  H04L5/00

CPC分类号： H04L5/0048 ,  H04L27/0014 ,  H04L27/22 ,  H04L2027/003 ,  H04L2027/0034 ,  H04L2027/0048 ,  H04L2027/0095 ,  H04W84/12

摘要： Methods and system for carrier frequency offset (CFO) estimation are described. The method includes determining correlation values between a plurality of samples from a received signal and a plurality of reference signals corresponding to a plurality of CFO candidates. A set of correlation values which exceeds a threshold is determined and a corresponding CFO candidate for each correlation value in the set is selected. A CFO estimate based on an interpolation of selected CFO candidates is then calculated.

摘要翻译： 描述载波频率偏移（CFO）估计的方法和系统。 该方法包括从接收到的信号和对应于多个CFO候选的多个参考信号确定多个样本之间的相关值。 确定超过阈值的一组相关值，并且选择该集合中的每个相关值的对应的CFO候选。 然后计算基于所选CFO候选的内插的CFO估计。

公开(公告)号：US20150103965A1

公开(公告)日：2015-04-16

申请号：US14574967

申请日：2014-12-18

申请人： Imagination Technologies, Limited

发明人： Sujai Chari

IPC分类号： H04L7/00

CPC分类号： H04L27/2657 ,  H04J3/0608 ,  H04L7/042 ,  H04L27/0014 ,  H04L2027/003 ,  H04L2027/0048 ,  H04L2027/0095

摘要： Apparatuses, methods and systems for mitigating carrier offset of a received signal are disclosed. One embodiment of a receiver includes a controller operative to determine that a communication signal being received is from a desired transmitter, and to determine a carrier offset correction based on prior reception of communication signals from the desired transmitter, comprising retrieving a carrier offset of the desired transmitter from one or more stored carrier offsets based on previous communication with the desired transmitter and a temperature of the receiver. The receiver further includes a receiver chain operative to receive the communication signal from the desired transmitter, and to generate a carrier offset corrected received signal based on the retrieved carrier offset by applying the carrier offset correction to the received communication signal. The receiver is operative to synchronize to the carrier offset corrected received communication signal.

摘要翻译： 公开了用于减轻接收信号的载波偏移的装置，方法和系统。 接收机的一个实施例包括控制器，其操作以确定正在接收的通信信号来自期望的发射机，并且基于来自所需发射机的通信信号的先前接收来确定载波偏移校正，包括检索期望的载波偏移 基于与所需发射机的先前通信和接收机的温度的一个或多个存储的载波偏移的发射机。 接收机还包括一个接收机链，其操作用于从期望的发射机接收通信信号，并且通过对所接收的通信信号应用载波偏移校正，基于检索到的载波偏移来产生载波偏移校正的接收信号。 接收机可操作地与载波偏移校正的接收通信信号同步。

公开(公告)号：US08184748B2

公开(公告)日：2012-05-22

申请号：US12474814

申请日：2009-05-29

申请人： Peter David Massam ,  Philip Alan Bowden ,  Timothy David Howe ,  Timothy Jackson

发明人： Peter David Massam ,  Philip Alan Bowden ,  Timothy David Howe ,  Timothy Jackson

IPC分类号： H04L27/06

CPC分类号： H04L7/042 ,  H04L7/046 ,  H04L27/0014 ,  H04L27/16 ,  H04L27/2657 ,  H04L2027/0026 ,  H04L2027/0048 ,  H04L2027/0065 ,  H04L2027/0095

摘要： An RF receiver comprises a signal processor arranged to perform a method of decoding data contained within a signal that comprises a set of slots, at least one said slot comprising a preamble portion and a payload portion and being transmitted at a predetermined transmission frequency. The signal processor is arranged to perform a first process to derive timing data from the preamble portion and perform a second process to extract information from the payload portion, the second process being triggered from said timing data derived from the first process. The preamble portion comprises at least a first sequence of data and a second sequence of data, and the second sequence is the inverse of the first sequence. In preferred embodiments the first process comprises identifying a transition between said first and second sequences of data and deriving said timing data from the identified transition.

摘要翻译： RF接收机包括信号处理器，被配置为执行解码包含在包括一组时隙的信号中的数据的方法，所述至少一个所述时隙包括前导码部分和有效载荷部分并且以预定的传输频率发送。 信号处理器被布置为执行第一处理以从前导码部分导出定时数据，并执行从有效载荷部分提取信息的第二处理，第二处理是从从第一处理导出的所述定时数据触发的。 前导部分包括至少第一数据序列和第二数据序列，第二序列是第一序列的倒数。 在优选实施例中，第一过程包括识别所述第一和第二数据序列之间的转换并从所识别的转换中导出所述定时数据。

公开(公告)号：US07769358B2

公开(公告)日：2010-08-03

申请号：US10593709

申请日：2005-03-23

申请人： Makoto Sasaki ,  Takashi Enoki ,  Katsumi Iizuka

发明人： Makoto Sasaki ,  Takashi Enoki ,  Katsumi Iizuka

IPC分类号： H04B1/00

CPC分类号： H04L5/0048 ,  H04B1/707 ,  H04L5/0021 ,  H04L27/2602 ,  H04L27/2657 ,  H04L27/2675 ,  H04L27/3836 ,  H04L2027/0048 ,  H04L2027/0055 ,  H04L2027/0091

摘要： A radio system having an improved phase noise characteristic and a thereby improved communication quality, a radio transmitter, and a radio receiver. In the radio system, a radio transmitter (101) transmits a multiplexed signal so multiplexed that a pilot signal transmitted at the center frequency. A radio receiver (151) comprises an antenna (152) for receiving a radio signal from the radio transmitter (101), a distributor (159) for distributing the received signal received by the antenna (152) to two directions, a bandpass filter (160) for extracting a signal component corresponding to the pilot signal having the same center frequency as one of the distributed signals distributed by the distributor (159), a delay corrector (162) for delaying the other of the distributed signals, and a quadrature demodulator (163) for multiplying the frequency of the signal component corresponding to the pilot signal extracted by the bandpass filter (160) by the frequency of the other signal delayed by the delay corrector (162) and performing quadrature demodulation.

摘要翻译： 具有改进的相位噪声特性和由此改善的通信质量的无线电系统，无线电发射机和无线电接收机。 在无线电系统中，无线电发射机（101）发送多路复用的复用信号，使得以中心频率发送的导频信号。 无线电接收器（151）包括用于从无线电发射机（101）接收无线电信号的天线（152），用于将由天线（152）接收的接收信号分配给两个方向的分配器（159），带通滤波器 160），用于提取与由分配器（159）分配的分布式信号之一具有相同中心频率的导频信号的信号分量，用于延迟分配信号中的另一个的延迟校正器（162）和正交解调器 （163），用于将与由带通滤波器（160）提取的导频信号相对应的信号分量的频率乘以由延迟校正器（162）延迟的另一个信号的频率，并执行正交解调。

公开(公告)号：US07630428B2

公开(公告)日：2009-12-08

申请号：US11314122

申请日：2005-12-21

申请人： Donald John Rasmussen ,  Gregory Thomas Barnett

发明人： Donald John Rasmussen ,  Gregory Thomas Barnett

IPC分类号： H04B1/00

CPC分类号： H04L27/0014 ,  H04B1/70752 ,  H04L2027/003 ,  H04L2027/0048 ,  H04L2027/0067

摘要： Methods and apparatus for determining carrier frequency error of a serial offset quadrature pulse shaped signal, such as a minimum shift keyed (MSK) signal, are disclosed. Carrier frequency error is determined by receiving a quadrature pulse shaped signal having a synchronization sequence, detecting synchronization of the quadrature pulse shaped signal, and storing a baseband inphase (I) signal and a baseband quadrature (Q) signal of the synchronization sequence while detecting synchronization. After detecting synchronization, segments of the stored baseband I and Q signals are read and correlated with a spreading sequence. Carrier frequency error is then estimated based on phase differences between each of the correlated segments.

摘要翻译： 公开了用于确定诸如最小移位键控（MSK）信号的串行偏移正交脉冲形状信号的载波频率误差的方法和装置。 通过接收具有同步序列的正交脉冲形状信号，检测正交脉冲形状信号的同步以及存储同步序列的基带同相（I）信号和基带正交（Q）信号同时检测同步，确定载波频率误差 。 在检测到同步之后，存储的基带I和Q信号的段被读取并与扩展序列相关联。 然后基于每个相关段之间的相位差来估计载波频率误差。

公开(公告)号：US20080101499A1

公开(公告)日：2008-05-01

申请号：US11573682

申请日：2005-08-13

申请人： Ho Wang Fung ,  Sumei Sun ,  Chin Keong Ho ,  Ying Chang Liang ,  Yan Wu

发明人： Ho Wang Fung ,  Sumei Sun ,  Chin Keong Ho ,  Ying Chang Liang ,  Yan Wu

IPC分类号： H04L27/00

CPC分类号： H04L27/2613 ,  H04L27/266 ,  H04L27/2675 ,  H04L2027/0028 ,  H04L2027/0048 ,  H04L2027/0095

摘要： A transmitter is described which has a determination unit for determining a plurality of symbols (301) such that each symbol (301) comprises a tail component (302) and the plurality is determined in such a way that the tail components (302) are substantially equal and a tone generation unit for arranging the plurality of symbols (301) to form a plurality of long preambles (300) such that the plurality of long preambles (300) are tone-interleaved.

摘要翻译： 描述了一种发射机，其具有用于确定多个符号（301）的确定单元，使得每个符号（301）包括尾部分量（302），并且多个确定单元使得尾部分量（302）基本上 相等和音调生成单元，用于排列多个符号（301）以形成多个长前导码（300），使得多个长前导码（300）被进行音调交织。

公开(公告)号：US20070025476A1

公开(公告)日：2007-02-01

申请号：US11314122

申请日：2005-12-21

申请人： Donald Rasmussen ,  Gregory Barnett

发明人： Donald Rasmussen ,  Gregory Barnett

IPC分类号： H04L27/06 ,  H04L7/06

CPC分类号： H04L27/0014 ,  H04B1/70752 ,  H04L2027/003 ,  H04L2027/0048 ,  H04L2027/0067

摘要： Methods and apparatus for determining carrier frequency error of a serial offset quadrature pulse shaped signal, such as a minimum shift keyed (MSK) signal, are disclosed. Carrier frequency error is determined by receiving a quadrature pulse shaped signal having a synchronization sequence, detecting synchronization of the quadrature pulse shaped signal, and storing a baseband inphase (I) signal and a baseband quadrature (Q) signal of the synchronization sequence while detecting synchronization. After detecting synchronization, segments of the stored baseband I and Q signals are read and correlated with a spreading sequence. Carrier frequency error is then estimated based on phase differences between each of the correlated segments.

摘要翻译： 公开了用于确定诸如最小移位键控（MSK）信号的串行偏移正交脉冲形状信号的载波频率误差的方法和装置。 通过接收具有同步序列的正交脉冲形状信号，检测正交脉冲形状信号的同步以及存储同步序列的基带同相（I）信号和基带正交（Q）信号同时检测同步，确定载波频率误差 。 在检测到同步之后，存储的基带I和Q信号的段被读取并与扩展序列相关联。 然后基于每个相关段之间的相位差来估计载波频率误差。

公开(公告)号：US20060045137A1

公开(公告)日：2006-03-02

申请号：US11026957

申请日：2004-12-30

申请人： Pansoo Kim ,  Yun-Jeong Song ,  Soon-Ik Jeon ,  Deock-Gil Oh ,  Ho-Jin Lee

发明人： Pansoo Kim ,  Yun-Jeong Song ,  Soon-Ik Jeon ,  Deock-Gil Oh ,  Ho-Jin Lee

IPC分类号： H04J3/06

CPC分类号： H04L27/0014 ,  H04L2027/0028 ,  H04L2027/0048 ,  H04L2027/0065 ,  H04L2027/0069

摘要： Provided are an apparatus for estimating frequency offset from received signal and method for the same. The apparatus and method estimates frequency offset precisely without increment of autocorrelator by performing moving average filtering on a noised signal to thereby alleviate jitter. The frequency offset estimating apparatus includes: moving average filter for alleviating jitter of received signal; multiplier for multiplying a filtered signal by conjugate complex operanded pilot signal; phase-rotation value calculator for calculating a phase-rotation value from multiplicand operanded signal by using of symbol delay and an autocorrelation function; frequency offset estimator for estimating frequency offset from the phase-rotation value based on a smoothing function multiplication.

摘要翻译： 提供了一种用于从接收信号估计频率偏移的装置及其方法。 该装置和方法通过对噪声信号执行移动平均滤波来精确地估计频率偏移而不增加自相关器，从而减轻抖动。 频率偏移估计装置包括：移动平均滤波器，用于减轻接收信号的抖动; 乘法器，用于将经滤波的信号乘以共轭复运算导频信号; 相位旋转值计算器，用于通过使用符号延迟和自相关函数来从被乘数运算信号计算相位旋转值; 频率偏移估计器，用于基于平滑函数乘法估计相位旋转值的频率偏移。

公开(公告)号：US06687309B1

公开(公告)日：2004-02-03

申请号：US09675772

申请日：2000-09-29

申请人： Xiangzhou Joe Zhang ,  Robin A. Bordow

发明人： Xiangzhou Joe Zhang ,  Robin A. Bordow

IPC分类号： H04L512

CPC分类号： H04L27/38 ,  H04L2027/0028 ,  H04L2027/0048 ,  H04L2027/0065

摘要： A first system includes a converter, complex signal generator, exponentiator, FFT module and processor to estimate carrier frequency of a high symbol rate quadrature amplutide modulated (QAM) signal relative to a target carrier frequency. The converter converts the applied QAM signal to an intermediate frequency (IF) signal and digitizes the IF signal at a predesignated sample rate. The complex signal generator extracts a real component of the digitized IF signal, provides an imaginary component of the digitized IF signal and then combines the real component and the imaginary component in a complex signal. The exponentiator, raises the complex signal to a predesignated power and the FFT module performs a Fast Fourier Transform (FFT), having a predetermined number of samples, on the complex signal as raised to the predesignated power. The processor, takes the magnitude of the resulting FFT, extracts the index of a sample within the resulting FFT having the greatest magnitude and estimates the carrier frequency of the applied QAM signal relative to a target carrier frequency based on the predesignated power, the extracted index and the predesignated sample rate. In a second system a quadrature downconverter replaces the complex signal generator.

摘要翻译： 第一系统包括转换器，复信号发生器，指数器，FFT模块和处理器，用于估计相对于目标载波频率的高符号速率正交幅度调制（QAM）信号的载波频率。 转换器将应用的QAM信号转换为中频（IF）信号，并以预先指定的采样率对IF信号进行数字化。 复信号发生器提取数字化IF信号的实数分量，提供数字化IF信号的虚分量，然后在复信号中组合实分量和虚分量。 指数器将复数信号提高到预先指定的功率，并且FFT模块在复合信号上执行具有预定数量的采样的快速傅里叶变换（FFT），以提高到预定功率。 处理器获取所得FFT的幅度，提取具有最大幅度的所得FFT内的样本的索引，并且基于预先指定的功率来估计所施加的QAM信号相对于目标载波频率的载波频率，所提取的索引 和预先指定的采样率。 在第二系统中，正交下变频器代替复信号发生器。

公开(公告)号：US06256359B1

公开(公告)日：2001-07-03

申请号：US08840988

申请日：1997-04-21

申请人： Takahiko Masumoto ,  Kazuhiro Kimura ,  Hiroshi Kaneko

发明人： Takahiko Masumoto ,  Kazuhiro Kimura ,  Hiroshi Kaneko

IPC分类号： H04L512

CPC分类号： H04L27/2332 ,  H04H20/22 ,  H04H60/44 ,  H04H2201/13 ,  H04L2027/0028 ,  H04L2027/0048

摘要： Received signals are digitized by a comparator, and sampled by regenerated clock signals synchronized to a carrier. Biphase symbol data are demodulated based on the sampling data. A biphase decoder circuit performs subtraction of the biphase symbol data to be paired. The subtraction result is compared with threshold values by data judgment circuitry which then judges inversion of the biphase signals to be paired. An RDS-ID detector circuit detects inversion of RDS signals by detection of either continuity or a ratio of signals received for a certain length period. Alternatively, RDS signals are detected by stability of output from the pair judgment circuit to detect a combination of biphase symbols.

摘要翻译： 接收信号由比较器数字化，并通过与载波同步的再生时钟信号采样。 基于采样数据对双相符号数据进行解调。 双相解码器电路执行要配对的双相符号数据的减法。 通过数据判断电路将减法结果与阈值进行比较，然后数据判断电路判断双相信号的配对倒置。 RDS-ID检测器电路通过检测在一定长度周期内接收的信号的连续性或比率来检测RDS信号的反转。 或者，通过对对判断电路的输出的稳定性来检测RDS信号，以检测双相符号的组合。