公开(公告)号：US08094767B1

公开(公告)日：2012-01-10

申请号：US11302102

申请日：2005-12-12

申请人： Peter Smidth

发明人： Peter Smidth

IPC分类号： H04L7/00 ,  H04L7/02 ,  H04L7/04 ,  H04L7/06

CPC分类号： H04L7/042 ,  H04L7/06

摘要： The present invention provides methods and systems for allowing a receiver in a (wireless) communication system to synchronize its timing and frequency subsystems in accordance with a received signal. In accordance with one aspect, a method is provided in which a relative time of arrival of sync values provided in a received signal are determined and used to align the receiver's reference signal(s) accordingly. Other aspects of the invention will become apparent from the detailed description of exemplary embodiments that follows.

摘要翻译： 本发明提供了允许（无线）通信系统中的接收机根据接收到的信号来同步其定时和频率子系统的方法和系统。 根据一个方面，提供了一种方法，其中确定在接收信号中提供的同步值的相对时间到达并且用于相应地对准接收机的参考信号。 从下面的示例性实施例的详细描述中，本发明的其它方面将变得显而易见。

公开(公告)号：US08019025B2

公开(公告)日：2011-09-13

申请号：US11707605

申请日：2007-02-15

申请人： Sebin Im ,  Hyungjin Choi

发明人： Sebin Im ,  Hyungjin Choi

IPC分类号： H03D1/00 ,  H04L7/06 ,  H04L7/00 ,  H04B3/10 ,  H04J3/06

CPC分类号： H04L27/2656 ,  H04L7/041 ,  H04L27/2613 ,  H04L27/2675

摘要： Disclosed is a system and a training sequence setting method for performing frame synchronization in a wireless communication system. A received signal is affected by a frequency offset due to an oscillator mismatch between the transmitter and the receiver, which is one of the main causes of performance degradation of frame synchronization. In a prior Constant Amplitude Zero Auto-Correlation (CAZAC) sequence, the larger the frequency offset becomes, the more conspicuously the performance degradation of the frame synchronization occurs. The proposed training is designed to maintain a prior CAZAC property during a differential detection so as to perform a differential detection-based frame synchronization sequence insensitive to the frequency offset. As a result of performance verification, the proposed training sequence indicates that its performance of the frame synchronization is irrespective of the frequency offset, and has a better performance than the prior CAZAC sequence and random sequence.

摘要翻译： 公开了一种用于在无线通信系统中执行帧同步的系统和训练序列设置方法。 接收到的信号受到发射机和接收机之间的振荡器失配的频率偏移的影响，这是帧同步性能下降的主要原因之一。 在先前的恒幅零自相关（CAZAC）序列中，频率偏移越大，帧同步性能下降越明显。 所提出的训练被设计为在差分检测期间保持先前的CAZAC属性，以便执行对频率偏移不敏感的基于差分检测的帧同步序列。 作为性能验证的结果，所提出的训练序列指示其帧同步的性能与频率偏移无关，并且具有比先前的CAZAC序列和随机序列更好的性能。

公开(公告)号：USRE42538E1

公开(公告)日：2011-07-12

申请号：US11882449

申请日：2007-08-01

申请人： Chiaming Lo ,  Robert Joseph McCarty

发明人： Chiaming Lo ,  Robert Joseph McCarty

IPC分类号： H04L7/00 ,  H04L7/06

CPC分类号： H04W52/362 ,  H04L5/06 ,  H04L27/36 ,  H04W52/367

摘要： A system and method for information content-independent synchronization with a received signal. A variable of the signal (e.g., average energy or magnitude) which is related to the energy distribution, is measured over a period of time. The signal's information bearing point is found at the point within the information period of the signal with the highest averaged energy. The point may be found, for example, by detecting the sample point with highest average energy, or by correlating multiple sample points to a stored template. Interpolation may be performed to locate an information bearing point that is between sample points. Because the relative energy content of the signal is effectively independent of the specific information content, synchronization with the information bearing point is accomplished without requiring the insertion of any special information content or fixed content patterns into the signal.

摘要翻译： 一种用于与接收信号进行信息内容独立同步的系统和方法。 在一段时间内测量与能量分布相关的信号变量（例如，平均能量或幅度）。 信号的信息承载点位于具有最高平均能量的信号的信息周期内。 例如，可以通过检测具有最高平均能量的采样点，或通过将多个采样点与存储的模板相关联来发现该点。 可以执行插值以定位在采样点之间的信息承载点。 由于信号的相对能量含量与特定的信息内容无关，所以与信息承载点的同步完成，而不需要将任何特殊信息内容或固定内容模式插入到信号中。

公开(公告)号：US07869552B2

公开(公告)日：2011-01-11

申请号：US11727218

申请日：2007-03-26

申请人： Masaharu Yanagidate

发明人： Masaharu Yanagidate

IPC分类号： H04L7/06

CPC分类号： H04L7/041

摘要： In a receiving apparatus for receiving communication data from a transmitting apparatus, specific code patterns are inserted in the communication data at predetermined intervals. The receiving apparatus includes a first frequency difference measurement device for measuring a first frequency difference between a receiving clock of the receiving apparatus and a transmission clock provided to the communication data, based on one of the specific code patterns and another of the specific code patterns which is positioned later; and a frequency adjustment device for adjusting a frequency of the receiving clock based on the measured first frequency difference so that the frequency substantially coincides with a frequency of the transmission clock.

摘要翻译： 在用于从发送装置接收通信数据的接收装置中，以预定的间隔将特定码型插入到通信数据中。 接收装置包括：第一频率差测量装置，用于基于特定编码模式之一和另一种特定编码模式来测量接收装置的接收时钟和提供给通信数据的传输时钟之间的第一频率差， 稍后定位 以及频率调整装置，用于基于所测量的第一频率差来调整接收时钟的频率，使得频率基本上与传输时钟的频率一致。

公开(公告)号：US07787579B2

公开(公告)日：2010-08-31

申请号：US11878332

申请日：2007-07-24

申请人： Kentaro Toda ,  Motoatsu Yoshikawa

发明人： Kentaro Toda ,  Motoatsu Yoshikawa

IPC分类号： H04L7/06

CPC分类号： H04L7/042

摘要： A frame synchronous circuit operable in a dedicated short-range communication system, applicable to several modulation schemes, includes a UW detector for detecting a UW word from received data, an operation setting register group for specifying the operations of an on-board unit, a synchronous manager for controlling synchronization, an unlimited synchronization continuation register for maintaining the unlimited continuation of the synchronization, and an FCMC data analyzer for analyzing FCMC data. The operation setting register group can control synchronization by using not only operational information obtained from the FCMC data but also another operational information retrieved from an input device such as a CPU or terminal connected to the on-board unit. Consequently, debug and test operations can be performed without receiving any FCMC data.

摘要翻译： 可应用于若干调制方式的专用短距离通信系统中可操作的帧同步电路包括：用于从接收到的数据检测UW字的UW检测器，用于指定车载单元的操作的操作设置寄存器组， 用于控制同步的同步管理器，用于维持无限次持续同步的无限同步延续寄存器，以及用于分析FCMC数据的FCMC数据分析器。 操作设置寄存器组可以通过不仅使用从FCMC数据获得的操作信息来控制同步，而且还可以从诸如连接到板上单元的CPU或终端等输入设备检索到的另一个操作信息。 因此，可以在不接收任何FCMC数据的情况下执行调试和测试操作。

公开(公告)号：US07742552B1

公开(公告)日：2010-06-22

申请号：US12077282

申请日：2008-03-17

申请人： Hide Hattori

发明人： Hide Hattori

IPC分类号： H04L7/06 ,  H04L7/00

CPC分类号： H04B15/02 ,  H04B2215/067

摘要： A programmable spread spectrum clock generator (SSCG) reduces electromagnetic interference by spreading the frequency bandwidth of an output signal. The rate at which the frequency of the output signal changes, as well as other aspects of the output signal, are software programmable. The programmable SSCG receives a periodic signal whose cycles have substantially identical periods and outputs the output signal whose cycles have periods that vary smoothly over a plurality of cycles of the periodic signal. The programmable SSCG generates a control signal using the periodic signal. The programmable SSCG includes a variable delay element that generates the output signal by delaying the periods of the periodic signal based on the magnitude of the control signal. The output signal is generated without using a phase locked loop. Moreover, successive cycles of the output signal rarely have identical periods.

摘要翻译： 可编程扩频时钟发生器（SSCG）通过扩展输出信号的频率带宽来降低电磁干扰。 输出信号频率变化的速率以及输出信号的其他方面都是可编程的。 可编程SSCG接收周期信号，其周期具有基本相同的周期，并输出周期具有在周期信号的多个周期内平滑变化的周期的输出信号。 可编程SSCG使用周期信号产生控制信号。 可编程SSCG包括可变延迟元件，其通过基于控制信号的幅度延迟周期信号的周期来产生输出信号。 在不使用锁相环的情况下生成输出信号。 此外，输出信号的连续周期很少具有相同的周期。

公开(公告)号：US20100046685A1

公开(公告)日：2010-02-25

申请号：US12194673

申请日：2008-08-20

申请人： Jung-Jen Liu

发明人： Jung-Jen Liu

IPC分类号： H04L7/06

CPC分类号： H04L27/2656 ,  H04L27/2659 ,  H04L27/2662 ,  H04L27/2675 ,  H04L27/2678

摘要： A method and system for reducing power consumption of OFDM (Orthogonal Frequency Division Multiplexing) signal synchronization circuit comprises a sync setting, a sync controller, a sync pipeline and a data corrector. The sync setting dynamically changes correlation data sample rate based on synchronization statuses and results. The sync controller controls and schedules frame and symbol synchronizations, and turns on and off the sync pipeline based on synchronization activities. The sync pipeline integrates frame and symbol synchronization operations, synchronizes receiving signal with scalable synchronization window, synchronization sequence length, synchronization delay and variable data sample rate. Data corrector adjusts input data with coarse timing and fine frequency offsets estimated in sync pipeline, and generates corrected output data for further processing. By using the above techniques, the power consumption of signal synchronization circuit is reduced.

摘要翻译： 用于降低OFDM（正交频分复用）信号同步电路的功耗的方法和系统包括同步设置，同步控制器，同步线路和数据校正器。 同步设置基于同步状态和结果动态地改变相关数据采样率。 同步控制器控制和调度帧和符号同步，并基于同步活动打开和关闭同步流水线。 同步流水线集成了帧和符号同步操作，将接收信号与可伸缩同步窗口同步，同步序列长度，同步延迟和可变数据采样率。 数据校正器以同步流水线估计的粗定时和精细频率偏移来调整输入数据，并生成校正输出数据进行进一步处理。 通过使用上述技术，信号同步电路的功耗降低。

公开(公告)号：US20090103672A1

公开(公告)日：2009-04-23

申请号：US11770742

申请日：2007-06-29

申请人： KIYOTAKA ICHIYAMA ,  MASAHIRO ISHIDA

发明人： KIYOTAKA ICHIYAMA ,  MASAHIRO ISHIDA

IPC分类号： H04L7/06

CPC分类号： H04L7/0008 ,  H04L25/493

摘要： There is provided a circuit constituted by small-sized and simple logical gates which reduces the bit errors generated in a data sequence received by a receiver. A transmission system, in which a data sequence is transferred, includes a transmitter that transmits a first transfer signal including an edge-present data waveform which has (i) a first timing edge indicating a timing to obtain data included in the data sequence and (ii) a level signal indicating a signal level corresponding to a value of the data, and a receiver that outputs the value of the data in accordance with the signal level which is detected at the timing indicated by the first timing edge of the edge-present data waveform.

摘要翻译： 提供了由小型和简单的逻辑门构成的电路，其减少了由接收器接收的数据序列中产生的位错误。 传输数据序列的传输系统包括发送包括边缘存在数据波形的第一传输信号的发射机，该第一传输信号具有（i）指示定时的第一定时边缘以获得数据序列中包括的数据， ii）指示与数据值相对应的信号电平的电平信号，以及接收器，其根据在由边缘存在的第一定时边缘指示的定时检测到的信号电平输出数据值 数据波形。

公开(公告)号：US07379517B1

公开(公告)日：2008-05-27

申请号：US10444913

申请日：2003-05-23

申请人： William C. Black

发明人： William C. Black

IPC分类号： H04L7/00 ,  H04L7/06

CPC分类号： H04L7/04 ,  H04L5/20 ,  H04L7/043

摘要： A method and apparatus are provided that allow exploitation of the common mode characteristics of a differential transmission network to provide an additional data signal. Signal (MODE) represents either a binary signal or a multi-valued signal to allow signaling of one or more bits of information. The signaling occurs through the variation of the common mode voltage in transmitters (300 and 400) and is detected using differential receiver (600). One embodiment is presented that achieves signaling of an extended run length data sequence to allow continued transmitter/receiver synchronization throughout the transmission of the sequence. In an alternate embodiment, a separate data path is provided to signal the extended run length sequence when a common mode signaling path is not available.

摘要翻译： 提供了一种允许利用差分传输网络的共模特性以提供附加数据信号的方法和装置。 信号（MODE）表示二进制信号或多值信号，以允许一个或多个信息位的信令。 通过发射机（300和400）中的共模电压的变化发生信令，并使用差分接收机（600）进行检测。 呈现一个实施例，其实现扩展游程长度数据序列的信令，以允许在序列的整个传输过程中继续的发射机/接收机同步。 在替代实施例中，当共模信令路径不可用时，提供单独的数据路径来用信号通知延长的游程长度序列。

公开(公告)号：US07292669B2

公开(公告)日：2007-11-06

申请号：US10730271

申请日：2003-12-09

申请人： Hiroki Furukawa

发明人： Hiroki Furukawa

IPC分类号： H04L7/06

CPC分类号： H04H60/11 ,  H04H40/18 ,  H04H60/37 ,  H04H2201/20 ,  H04L27/261 ,  H04L27/2647 ,  H04L27/2656 ,  H04L27/2676

摘要： In a null symbol detection device, at the time of receiving a terrestrial digital broadcast, a null symbol can be stably detected even under a fading environment. A synchronous addition buffer group is provided subsequent to an amplitude detector so as to synchronously add an OFDM signal at a null symbol repetition period. A moving average processing unit performs a moving average operation upon synchronous addition data with the number of samples corresponding to a null symbol to output a moving average value. A transmission mode determining unit detects the minimum value among the moving average values normalized in a correction processing unit and compares levels of the minimum values to determine a reception mode. A null position detector generates a synchronous pulse at a null position.

摘要翻译： 在零符号检测装置中，在接收地面数字广播时，即使在褪色环境下也能够稳定地检测到零符号。 在幅度检测器之后提供同步加法缓冲器组，以便以零符号重复周期同步地添加OFDM信号。 移动平均处理单元对具有对应于零符号的采样数的同步相加数据执行移动平均操作，以输出移动平均值。 传输模式确定单元检测在校正处理单元中归一化的移动平均值中的最小值，并且比较最小值的电平以确定接收模式。 空位检测器在零位置产生同步脉冲。