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1. 发明授权

US07733971B2 Apparatus and method for recovering frequency in an orthogonal frequency division multiplexing system 有权
标题翻译：在正交频分复用系统中恢复频率的装置和方法
公开(公告)号：US07733971B2
公开(公告)日：2010-06-08
申请号：US11606353
申请日：2006-11-30
申请人： Hee-Jin Roh , Su-Jin Yoon , Min-Goo Kim
发明人： Hee-Jin Roh , Su-Jin Yoon , Min-Goo Kim
IPC分类号： H04K1/10
CPC分类号： H04L27/266 , H04L27/2659 , H04L27/2675 , H04L27/2686
摘要： An apparatus and method for recovering a carrier frequency of a received signal using a predefined symbol in an OFDM system is provided. A maximum value detector detects at least three values and their corresponding offsets in descending order among auto-correlation values calculated within a specific frequency offset range between a received signal and a predefined symbol. A frequency offset corrector compares a ratio of a first auto-correlation value to a second auto-correlation value with a predetermined first threshold, determines whether first and second frequency offsets corresponding to the first and second auto-correlation values are adjacent to each other if the ratio of the auto-correlation values is less than the first threshold, and determines an initial carrier frequency offset using a difference between the first frequency offset and a frequency offset correction value determined according to system, if the first and second frequency offsets are adjacent to each other and a ratio of the second auto-correlation value and a third auto-correlation value is greater than a predetermined second threshold.
摘要翻译：提供了一种用于在OFDM系统中使用预定符号来恢复接收信号的载波频率的装置和方法。最大值检测器在接收信号和预定义符号之间的特定频率偏移范围内计算的自相关值之中以降序检测至少三个值及其相应的偏移。频率偏移校正器将第一自相关值与第二自相关值的比率与预定的第一阈值进行比较，确定与第一和第二自相关值对应的第一和第二频率偏移是否彼此相邻如果所述自相关值的比率小于所述第一阈值，并且如果所述第一和第二频率偏移相邻，则使用根据系统确定的所述第一频率偏移和频率偏移校正值之间的差来确定初始载波频率偏移并且第二自相关值和第三自相关值的比率大于预定的第二阈值。

2. 发明申请

US20070133391A1 Apparatus and method for carrier frequency synchronization in an OFDM system 有权
标题翻译： OFDM系统中载波频率同步的装置和方法
公开(公告)号：US20070133391A1
公开(公告)日：2007-06-14
申请号：US11605484
申请日：2006-11-29
申请人： Hee-Jin Roh , Su-Jin Yoon , Min-Goo Kim
发明人： Hee-Jin Roh , Su-Jin Yoon , Min-Goo Kim
IPC分类号： H04J11/00 , H04J1/00
CPC分类号： H04L27/2675 , H04L27/2659 , H04L27/2672 , H04L27/2684 , H04L27/2688
摘要： An apparatus and method for carrier frequency synchronization in an Orthogonal Frequency Division Multiplexing (OFDM) system are provided for correcting an initial carrier frequency offset in the OFDM system. A metric generator for frequency estimation performs a first accumulation process for a value computed by multiplying a Phase Reference Symbol (PRS) generated from a reception stage by a Fast Fourier Transform (FFT) output signal for an OFDM symbol in a PRS position within a frame, acquires a differential symbol from a product of adjacent FFT output symbols, performs a second accumulation process for a real part extracted from the differential symbol, and outputs a metric value for the frequency estimation. A maximal value-related index generator compares metric values for initial frequency estimation within a predetermined frequency offset estimation range, and selects and outputs a maximal metric value as a frequency offset estimate.
摘要翻译：提供了一种用于正交频分复用（OFDM）系统中的载波频率同步的装置和方法，用于校正OFDM系统中的初始载波频率偏移。用于频率估计的度量发生器对通过将从接收级产生的相位参考符号（PRS）乘以帧内的PRS位置中的OFDM符号的快速傅立叶变换（FFT）输出信号而计算的值进行第一累积处理从相邻FFT输出符号的乘积获取差分符号，对从差分符号提取的实部执行第二累积处理，并输出用于频率估计的度量值。最大值相关索引发生器将预定频率偏移估计范围内的初始频率估计的度量值进行比较，并且选择并输出最大度量值作为频率偏移估计。

3. 发明申请

US20070133699A1 Apparatus and method for recovering frequency in an orthogonal frequency division multiplexing system 有权
标题翻译：在正交频分复用系统中恢复频率的装置和方法
公开(公告)号：US20070133699A1
公开(公告)日：2007-06-14
申请号：US11606353
申请日：2006-11-30
申请人： Hee-Jin Roh , Su-Jin Yoon , Min-Goo Kim
发明人： Hee-Jin Roh , Su-Jin Yoon , Min-Goo Kim
IPC分类号： H04K1/10
CPC分类号： H04L27/266 , H04L27/2659 , H04L27/2675 , H04L27/2686
摘要： An apparatus and method for recovering a carrier frequency of a received signal using a predefined symbol in an OFDM system is provided. A maximum value detector detects at least three values and their corresponding offsets in descending order among auto-correlation values calculated within a specific frequency offset range between a received signal and a predefined symbol. A frequency offset corrector compares a ratio of a first auto-correlation value to a second auto-correlation value with a predetermined first threshold, determines whether first and second frequency offsets corresponding to the first and second auto-correlation values are adjacent to each other if the ratio of the auto-correlation values is less than the first threshold, and determines an initial carrier frequency offset using a difference between the first frequency offset and a frequency offset correction value determined according to system, if the first and second frequency offsets are adjacent to each other and a ratio of the second auto-correlation value and a third auto-correlation value is greater than a predetermined second threshold.
摘要翻译：提供了一种用于在OFDM系统中使用预定符号来恢复接收信号的载波频率的装置和方法。最大值检测器在接收信号和预定义符号之间的特定频率偏移范围内计算的自相关值之中以降序检测至少三个值及其相应的偏移。频率偏移校正器将第一自相关值与第二自相关值的比率与预定的第一阈值进行比较，确定与第一和第二自相关值对应的第一和第二频率偏移是否彼此相邻如果所述自相关值的比率小于所述第一阈值，并且如果所述第一和第二频率偏移相邻，则使用根据系统确定的所述第一频率偏移和频率偏移校正值之间的差来确定初始载波频率偏移并且第二自相关值和第三自相关值的比率大于预定的第二阈值。

4. 发明授权

US07693039B2 Apparatus and method for carrier frequency synchronization in an OFDM system 有权
标题翻译： OFDM系统中载波频率同步的装置和方法
公开(公告)号：US07693039B2
公开(公告)日：2010-04-06
申请号：US11605484
申请日：2006-11-29
申请人： Hee-Jin Roh , Su-Jin Yoon , Min-Goo Kim
发明人： Hee-Jin Roh , Su-Jin Yoon , Min-Goo Kim
IPC分类号： H04J1/00 , H04L7/00
CPC分类号： H04L27/2675 , H04L27/2659 , H04L27/2672 , H04L27/2684 , H04L27/2688
摘要： An apparatus and method for carrier frequency synchronization in an Orthogonal Frequency Division Multiplexing (OFDM) system are provided for correcting an initial carrier frequency offset in the OFDM system. A metric generator for frequency estimation performs a first accumulation process for a value computed by multiplying a Phase Reference Symbol (PRS) generated from a reception stage by a Fast Fourier Transform (FFT) output signal for an OFDM symbol in a PRS position within a frame, acquires a differential symbol from a product of adjacent FFT output symbols, performs a second accumulation process for a real part extracted from the differential symbol, and outputs a metric value for the frequency estimation. A maximal value-related index generator compares metric values for initial frequency estimation within a predetermined frequency offset estimation range, and selects and outputs a maximal metric value as a frequency offset estimate.
摘要翻译：提供了一种用于正交频分复用（OFDM）系统中的载波频率同步的装置和方法，用于校正OFDM系统中的初始载波频率偏移。用于频率估计的度量发生器对通过将从接收级产生的相位参考符号（PRS）乘以帧内的PRS位置中的OFDM符号的快速傅立叶变换（FFT）输出信号而计算的值进行第一累积处理从相邻FFT输出符号的乘积获取差分符号，对从差分符号提取的实部执行第二累积处理，并输出用于频率估计的度量值。最大值相关索引发生器将预定频率偏移估计范围内的初始频率估计的度量值进行比较，并且选择并输出最大度量值作为频率偏移估计。

5. 发明授权

US07688149B2 Phase locked loop, phase detecting method for the phase locked loop, and receiver using the same 有权
标题翻译：锁相环，锁相环的相位检测方法和使用该锁相环的接收机
公开(公告)号：US07688149B2
公开(公告)日：2010-03-30
申请号：US11453852
申请日：2006-06-16
申请人： Hee-Jin Roh , Su-Jin Yoon , Min-Goo Kim
发明人： Hee-Jin Roh , Su-Jin Yoon , Min-Goo Kim
IPC分类号： H03L7/093
CPC分类号： H03L7/085 , G01R25/005 , H04L7/033
摘要： A Phase Locked Loop (PLL) is provided for improving acquisition performance in an acquisition state, while preventing performance degradation in a steady state under a low SNR environment, during phase detection, a phase detecting method for the PLL, and a receiver using the same. The PLL determines a period to which an input signal belongs according to the input signal and a feedback signal, outputs an error signal corresponding to the input signal by using a formula (or algorithm) set for the determined period, oscillates a predetermined frequency signal according to the error signal, and feeds back the oscillated signal.
摘要翻译：提供锁相环（PLL），用于在采集状态下改善采集性能，同时在相位检测期间防止在低SNR环境下的稳定状态下的性能下降，PLL的相位检测方法和使用该锁相环的接收机。 PLL根据输入信号和反馈信号确定输入信号所属的周期，通过使用为所确定的周期设置的公式（或算法）输出与输入信号相对应的误差信号，根据到错误信号，并反馈振荡的信号。

6. 发明申请

US20060284690A1 Phase locked loop, phase detecting method for the phase locked loop, and receiver using the same 有权
标题翻译：锁相环，锁相环的相位检测方法和使用该锁相环的接收机
公开(公告)号：US20060284690A1
公开(公告)日：2006-12-21
申请号：US11453852
申请日：2006-06-16
申请人： Hee-Jin Roh , Su-Jin Yoon , Min-Goo Kim
发明人： Hee-Jin Roh , Su-Jin Yoon , Min-Goo Kim
IPC分类号： H03L7/00
CPC分类号： H03L7/085 , G01R25/005 , H04L7/033
摘要： A Phase Locked Loop (PLL) is provided for improving acquisition performance in an acquisition state, while preventing performance degradation in a steady state under a low SNR environment, during phase detection, a phase detecting method for the PLL, and a receiver using the same. The PLL determines a period to which an input signal belongs according to the input signal and a feedback signal, outputs an error signal corresponding to the input signal by using a formula (or algorithm) set for the determined period, oscillates a predetermined frequency signal according to the error signal, and feeds back the oscillated signal.
摘要翻译：提供锁相环（PLL），用于在采集状态下改善采集性能，同时在相位检测期间防止在低SNR环境下的稳定状态下的性能下降，PLL的相位检测方法和使用该锁相环的接收机。 PLL根据输入信号和反馈信号确定输入信号所属的周期，通过使用为所确定的周期设置的公式（或算法）输出与输入信号相对应的误差信号，根据到错误信号，并反馈振荡的信号。

7. 发明授权

US08351550B2 Correlation apparatus and method for frequency synchronization in broadband wireless access communication system 有权
标题翻译：宽带无线接入通信系统中频率同步的相关装置和方法
公开(公告)号：US08351550B2
公开(公告)日：2013-01-08
申请号：US12363484
申请日：2009-01-30
申请人： Hee-Jin Roh , Jeoung-Gil Lee , Su-Jin Yoon , Hoon Kang , Chang-Hyun Baik , Jun-Kyu Kang , Hyung-Jin Choi , Se-Bin Im , Dae-Hong Lee
发明人： Hee-Jin Roh , Jeoung-Gil Lee , Su-Jin Yoon , Hoon Kang , Chang-Hyun Baik , Jun-Kyu Kang , Hyung-Jin Choi , Se-Bin Im , Dae-Hong Lee
IPC分类号： H03D1/00
CPC分类号： H04L27/2688 , H04L27/2659 , H04L27/2672 , H04L27/2675
摘要： A correlation apparatus and method for frequency synchronization are provided. A frequency synchronization method of a receiver in a broadband wireless access communication system includes acquiring a highest correlation value by conducting a differential correlation of a variable interval between a received signal and a reference signal and performing a frequency synchronization according to the highest correlation value.
摘要翻译：提供了一种用于频率同步的相关装置和方法。宽带无线接入通信系统中的接收机的频率同步方法包括通过对接收信号和参考信号进行可变间隔的差分相关，并根据最高相关值进行频率同步来获取最高相关值。

8. 发明申请

US20080095249A1 Apparatus and method for estimating coarse carrier frequency offset for frequency synchronization in OFDM receiver 审中-公开
标题翻译：用于估计OFDM接收机中频率同步的粗载波频偏的装置和方法
公开(公告)号：US20080095249A1
公开(公告)日：2008-04-24
申请号：US11645743
申请日：2006-12-27
申请人： Su-Jin Yoon , Yun-Ju Kwon , Hee-Jin Roh
发明人： Su-Jin Yoon , Yun-Ju Kwon , Hee-Jin Roh
IPC分类号： H04K1/10
CPC分类号： H04L27/2675 , H04L27/2659 , H04L27/2686
摘要： An apparatus and method for estimating a coarse carrier frequency offset in an OFDM receiver are provided, in which an Fast Fourier Transform (FFT) unit performs FFT for a received signal over one symbol duration and outputs a previously known signal included in the FFT signal, a correlation value calculator evaluates autocorrelation values of the previously known signal for plural candidate offsets, an accumulator accumulates the autocorrelation values to the autocorrelation values evaluated over a previous symbol duration, and a maximum value selector selects first and second maximum values of the autocorrelation values. A threshold tester compares a ratio between the first and second maximum values with a predetermined threshold, and determines a candidate offset corresponding to the first maximum value as the coarse carrier frequency offset if the ratio is less than the threshold. Otherwise, the threshold tester instructs the FFT unit to receive a signal over a next symbol duration.
摘要翻译：提供了一种用于估计OFDM接收机中的粗载波频率偏移的装置和方法，其中快速傅立叶变换（FFT）单元在一个符号持续时间内对接收到的信号执行FFT，并输出包括在FFT信号中的先前已知的信号，相关值计算器对多个候选偏移的先前已知信号的自相关值进行评估，累加器将自相关值累积到在先前符号持续时间内估计的自相关值，最大值选择器选择自相关值的第一和第二最大值。阈值测试器将第一和第二最大值之间的比率与预定阈值进行比较，并且如果该比率小于阈值，则将与第一最大值相对应的候选偏移量确定为粗略载波频率偏移。否则，阈值测试器指示FFT单元在下一个符号持续时间内接收信号。

9. 发明申请

US20060039318A1 Apparatus and method for allocating frequencies in an OFDM mobile communication system supporting high speed downlink packet access service 有权
标题翻译：在支持高速下行链路分组接入业务的OFDM移动通信系统中分配频率的装置和方法
公开(公告)号：US20060039318A1
公开(公告)日：2006-02-23
申请号：US11202091
申请日：2005-08-12
申请人： Hyun-Seok Oh , Kwang-Man Ok , Sang-Hyo Kim , Min-Goo Kim , Su-Jin Yoon
发明人： Hyun-Seok Oh , Kwang-Man Ok , Sang-Hyo Kim , Min-Goo Kim , Su-Jin Yoon
IPC分类号： H04Q7/00
CPC分类号： H04W72/048 , H04L5/0007 , H04L5/0037 , H04L5/006 , H04L5/0082 , H04L5/0087 , H04L5/026 , H04W64/006 , H04W72/0453
摘要： An apparatus and method for allocating a frequency resource to a user equipment (UE) in an orthogonal frequency division multiplexing (OFDM) mobile communication system. A base station receives feedback information including at least mobility information from the UE, and determines from the mobility information whether the UE belongs to a fast group or a slow group. The base station allocates a frequency resource for the UE according to an open-loop solution if the UE belongs to the fast group, allocates a frequency resource for the UE according to a closed-loop solution if the UE belongs to the slow group, and transmits data for the UE using the allocated frequency resource.
摘要翻译：一种用于在正交频分复用（OFDM）移动通信系统中向用户设备（UE）分配频率资源的装置和方法。基站从UE接收至少包括移动性信息的反馈信息，并根据移动性信息确定UE是属于快速组还是慢组。如果UE属于快速组，则基站根据开环方案为UE分配频率资源，如果UE属于慢速组，则根据闭环解决方案为UE分配频率资源;以及使用分配的频率资源发送UE的数据。

10. 发明授权

US07826415B2 Apparatus and method for allocating frequencies in an OFDM mobile communication system supporting high speed downlink packet access service 有权
标题翻译：在支持高速下行链路分组接入业务的OFDM移动通信系统中分配频率的装置和方法
公开(公告)号：US07826415B2
公开(公告)日：2010-11-02
申请号：US11202091
申请日：2005-08-12
申请人： Hyun-Seok Oh , Kwang-Man Ok , Sang-Hyo Kim , Min-Goo Kim , Su-Jin Yoon
发明人： Hyun-Seok Oh , Kwang-Man Ok , Sang-Hyo Kim , Min-Goo Kim , Su-Jin Yoon
IPC分类号： H04W4/00
CPC分类号： H04W72/048 , H04L5/0007 , H04L5/0037 , H04L5/006 , H04L5/0082 , H04L5/0087 , H04L5/026 , H04W64/006 , H04W72/0453
摘要： An apparatus and method for allocating a frequency resource to a user equipment (UE) in an orthogonal frequency division multiplexing (OFDM) mobile communication system. A base station receives feedback information including at least mobility information from the UE, and determines from the mobility information whether the UE belongs to a fast group or a slow group. The base station allocates a frequency resource for the UE according to an open-loop solution if the UE belongs to the fast group, allocates a frequency resource for the UE according to a closed-loop solution if the UE belongs to the slow group, and transmits data for the UE using the allocated frequency resource.
摘要翻译：一种用于在正交频分复用（OFDM）移动通信系统中向用户设备（UE）分配频率资源的装置和方法。基站从UE接收至少包括移动性信息的反馈信息，并根据移动性信息确定UE是属于快速组还是慢组。如果UE属于快速组，则基站根据开环方案为UE分配频率资源，如果UE属于慢速组，则根据闭环解决方案为UE分配频率资源;以及使用分配的频率资源发送UE的数据。

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