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1. 发明授权

US06678339B1 Globally optimum maximum likelihood estimation of joint carrier frequency offset and symbol timing error in multi-carrier systems 失效
标题翻译：多载波系统中联合载波频率偏移和符号定时误差的全局最优最大似然估计
公开(公告)号：US06678339B1
公开(公告)日：2004-01-13
申请号：US09496890
申请日：2000-02-02
申请人： Navid Lashkarian
发明人： Navid Lashkarian
IPC分类号： H03D100
CPC分类号： H04L27/2657 , H04L27/2662 , H04L27/2668 , H04L27/2689
摘要： A method for synchronizing multi-carrier signals in an orthogonal frequency division modulation (OFDM) data transmission system is disclosed which provides maximum likelihood estimation of timing offset and frequency offset. The estimates are able to compensate the estimation error over an entire span of observed data samples. The method requires no training sequence thus enabling blind frequency compensation. The method provides a joint probability density function for the estimates which consists of two terms; one generated from observed data received during a first interval and one generated from observed data received during a second, following, interval. The estimates provided by the method are therefore maximal likelihood over the entire span of observed signals and are a significant improvement over estimates provided by methods based only observations during the first interval. The method is mathematically robust and computationally and statistically efficient. Comparison studies generated by computer simulation graphically display the improved estimates provided by the invention over previous estimation techniques.
摘要翻译：公开了一种在正交频分调制（OFDM）数据传输系统中同步多载波信号的方法，其提供定时偏移和频率偏移的最大似然估计。估计可以补偿观测数据样本整个跨度的估计误差。该方法不需要训练序列，从而实现盲频补偿。该方法为由两个项组成的估计提供联合概率密度函数; 从在第一间隔期间接收的观测数据生成的一个，以及在第二间隔期间接收到的观测数据产生的一个。因此，该方法提供的估计是在观察信号的整个跨度上的最大可能性，并且比仅基于第一间隔期间的观察的方法提供的估计值显着改善。该方法在数学上是稳健的，计算上和统计学上有效的。通过计算机模拟产生的比较研究以图形方式显示了本发明提供的改进的估计与先前的估计技术。

2. 发明授权

US09584245B2 Non-coherent neighbor cell searching method 有权
标题翻译：非相干相邻小区搜索方法
公开(公告)号：US09584245B2
公开(公告)日：2017-02-28
申请号：US14226196
申请日：2014-03-26
申请人： National Central University
发明人： Pei-Yun Tsai , Shun-Fang Liu
IPC分类号： H04L27/26 , H04J11/00
CPC分类号： H04J11/0076 , H04J11/004 , H04J11/0093 , H04L27/2657 , H04L27/2668 , H04L27/2672 , H04L27/2692
摘要： The present invention relates to a non-coherent neighbor cell search method for primary synchronization signal (PSS) and secondary synchronization signal (SSS). In order to eliminate the channel response of the home cell, the present invention utilizes the similarity of channel responses at adjacent subcarriers, components at the kth subcarrier and the (k+1)th subcarrier of the received signal are respectively multiplied by the conjugation of the corresponding local synchronization signal to respectively obtain the kth product and the (k+1)th product. Afterward, a combination signal is obtained by examining the difference of the kth product and the (k+1)th product. By mathematical simplification and analysis, the main unknown component of the combination signal is the synchronization signal of neighbor cell, also in a compound form. Thus, the neighbor cell ID can be obtained by performing the correlation operation of the combination signal to the compound reference sequence.
摘要翻译：本发明涉及用于主同步信号（PSS）和次同步信号（SSS）的非相干相邻小区搜索方法。为了消除家庭小区的信道响应，本发明利用相邻子载波的信道响应的相似性，第k个子载波的分量和接收信号的第（k + 1）个子载波分别乘以相应的本地同步信号分别获得第k个乘积和第（k + 1）个乘积。之后，通过检查第k个乘积和第（k + 1）个乘积的差异来获得组合信号。通过数学简化和分析，组合信号的主要未知分量是相邻单元的同步信号，也是复合形式。因此，可以通过执行组合信号与复合参考序列的相关操作来获得相邻小区ID。

3. 发明申请

US20150280849A1 NON-COHERENT NEIGHBOR CELL SEARCHING METHOD 有权
标题翻译：非相邻邻域细胞检索方法
公开(公告)号：US20150280849A1
公开(公告)日：2015-10-01
申请号：US14226196
申请日：2014-03-26
申请人： National Central University
发明人： Pei-Yun Tsai , Shun-Fang Liu
IPC分类号： H04J11/00 , H04L27/26
CPC分类号： H04J11/0076 , H04J11/004 , H04J11/0093 , H04L27/2657 , H04L27/2668 , H04L27/2672 , H04L27/2692
摘要： The present invention relates to a non-coherent neighbor cell search method for primary synchronization signal (PSS) and secondary synchronization signal (SSS). In order to eliminate the channel response of the home cell, the present invention utilizes the similarity of channel responses at adjacent subcarriers, components at the kth subcarrier and the (k+1)th subcarrier of the received signal are respectively multiplied by the conjugation of the corresponding local synchronization signal to respectively obtain the kth product and the (k+1)th product. Afterward, a combination signal is obtained by examining the difference of the kth product and the (k+1)th product. By mathematical simplification and analysis, the main unknown component of the combination signal is the synchronization signal of neighbor cell, also in a compound form. Thus, the neighbor cell ID can be obtained by performing the correlation operation of the combination signal to the compound reference sequence.
摘要翻译：本发明涉及用于主同步信号（PSS）和次同步信号（SSS）的非相干相邻小区搜索方法。为了消除家庭小区的信道响应，本发明利用相邻子载波处的信道响应的相似性，第k个子载波的分量和接收信号的第（k + 1）个子载波分别乘以相应的本地同步信号分别获得第k个乘积和第（k + 1）个乘积。之后，通过检查第k个乘积和第（k + 1）个乘积的差异来获得组合信号。通过数学简化和分析，组合信号的主要未知分量是相邻单元的同步信号，也是复合形式。因此，可以通过执行组合信号与复合参考序列的相关操作来获得相邻小区ID。

4. 发明申请

US20120163367A1 APPARATUS AND METHOD FOR ACQUIRING SYNCHRONIZATION IN WIRELESS COMMUNICATION SYSTEM 审中-公开
标题翻译：在无线通信系统中获取同步的装置和方法
公开(公告)号：US20120163367A1
公开(公告)日：2012-06-28
申请号：US13333735
申请日：2011-12-21
申请人： Eun Young CHOI , Hun Sik KANG , Sok Kyu LEE
发明人： Eun Young CHOI , Hun Sik KANG , Sok Kyu LEE
IPC分类号： H04J3/06
CPC分类号： H04W56/00 , H04L27/2655 , H04L27/2656 , H04L27/2657 , H04L27/2662 , H04L27/2668
摘要： An apparatus for acquiring synchronization using a signal having repetition patterns is provided. The apparatus includes: a signal reception unit for receiving signal streams transmitted in the repetition patterns, a synchronization point tracking unit for calculating, during one period in which the signal streams are repeated in the repetition patterns, an add-sum of the signal streams, a sub-sum of the signal streams and an add-sub-sum which is a difference between the add-sum and the sub-sum, and for tracking an estimated synchronization point by comparing the sub-sum and the add-sub-sum, and a synchronization acquisition unit for acquiring, based on the estimated synchronization point, a synchronization point by searching for a point where the repetition of some of the signal streams is ended or a point where new signal streams having different characteristics from the signal streams are started.
摘要翻译：提供了一种使用具有重复图案的信号获取同步的装置。该装置包括：信号接收单元，用于接收以重复模式发送的信号流;同步点跟踪单元，用于在信号流在重复模式中重复的一个周期期间计算信号流的相加，信号流的子和作为加法和次和之差的加和和，并且通过比较子和和加和来跟踪估计的同步点以及同步获取单元，用于通过搜索一些信号流的重复结束的点或者与信号流具有不同特征的新信号流来基于所估计的同步点来获取同步点开始了

5. 发明授权

US08917704B2 Method and system for automatically rescaling an accumulation buffer in synchronization systems 有权
标题翻译：在同步系统中自动重新调整累加缓冲区的方法和系统
公开(公告)号：US08917704B2
公开(公告)日：2014-12-23
申请号：US12768415
申请日：2010-04-27
申请人： Francis Swarts , Mark Kent
发明人： Francis Swarts , Mark Kent
IPC分类号： H04J3/00 , H04L27/26 , H04L7/04 , H04L5/00
CPC分类号： H04L7/042 , H04L5/0048 , H04L27/2662 , H04L27/2668
摘要： A mobile device accumulates energy associated with each of successive PSS transmissions received from a base station. Accumulated energy values may be rescaled by a same number of bits whenever a buffer overflow condition occurs within the accumulation buffer. The mobile device may detect a correct PSS timing hypothesis utilizing the rescaled accumulated energy values within the accumulation buffer. A significant bit such as, for example, the most significant bit (MSB) or one of lesser significant bits, of each of the accumulated energy values may be monitored during the energy accumulation process to detect a buffer overflow condition. The mobile device may determine number of bits for rescaling or right shift each of the accumulated energy values in response to the detected buffer overflow condition. The resulting shifted accumulated energy values may be utilized for PSS detection. Either an integrating or filtering method is utilized during the energy accumulation process.
摘要翻译：移动设备累积与从基站接收的每个连续PSS传输相关联的能量。每当缓冲区溢出条件发生在累加缓冲区内时，累加的能量值可以被相同数量的位重新定标。移动设备可以使用累积缓冲器内的重新标定的累积能量值来检测正确的PSS定时假设。可以在能量累积过程期间监视每个累积能量值的诸如例如最高有效位（MSB）或较低有效位之一的有效位以检测缓冲器溢出状况。响应于检测到的缓冲器溢出条件，移动设备可以确定用于重新缩放的位数或者对每个累积的能量值进行右移。所得到的移位累积能量值可用于PSS检测。在能量积累过程中使用积分或滤波方法。

6. 发明申请

US20110243105A1 METHOD AND SYSTEM FOR AUTOMATICALLY RESCALING AN ACCUMULATION BUFFER IN SYNCHRONIZATION SYSTEMS 有权
标题翻译：在同步系统中自动调整累积缓冲器的方法和系统
公开(公告)号：US20110243105A1
公开(公告)日：2011-10-06
申请号：US12768415
申请日：2010-04-27
申请人： Francis Swarts , Mark Kent
发明人： Francis Swarts , Mark Kent
IPC分类号： H04W56/00 , H04J3/00
CPC分类号： H04L7/042 , H04L5/0048 , H04L27/2662 , H04L27/2668
摘要： A mobile device accumulates energy associated with each of successive PSS transmissions received from a base station. Accumulated energy values may be rescaled by a same number of bits whenever a buffer overflow condition occurs within the accumulation buffer. The mobile device may detect a correct PSS timing hypothesis utilizing the rescaled accumulated energy values within the accumulation buffer. A significant bit such as, for example, the most significant bit (MSB) or one of lesser significant bits, of each of the accumulated energy values may be monitored during the energy accumulation process to detect a buffer overflow condition. The mobile device may determine number of bits for rescaling or right shift each of the accumulated energy values in response to the detected buffer overflow condition. The resulting shifted accumulated energy values may be utilized for PSS detection. Either an integrating or filtering method is utilized during the energy accumulation process.
摘要翻译：移动设备累积与从基站接收的每个连续PSS传输相关联的能量。每当缓冲区溢出条件发生在累加缓冲区内时，累加的能量值可以被相同数量的位重新定标。移动设备可以使用累积缓冲器内的重新标定的累积能量值来检测正确的PSS定时假设。可以在能量累积过程期间监视每个累积能量值的诸如例如最高有效位（MSB）或较低有效位之一的有效位以检测缓冲器溢出状况。响应于检测到的缓冲器溢出条件，移动设备可以确定用于重新缩放的位数或者对每个累积的能量值进行右移。所得到的移位累积能量值可用于PSS检测。在能量积累过程中使用积分或滤波方法。

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