专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明授权

US08411846B2 Echo path change detection in telecommunications networks 有权
标题翻译：电信网络中的回波路径变化检测
公开(公告)号：US08411846B2
公开(公告)日：2013-04-02
申请号：US12117943
申请日：2008-05-09
申请人： Mizhou Tan
发明人： Mizhou Tan
IPC分类号： H04M9/08
CPC分类号： H04B3/23 , H04B3/234
摘要： In one embodiment, the present invention is a method for detecting an echo path change (EPC) in a telecommunications network. The method detects whether the effectiveness of echo cancellation of an echo canceller has decreased relatively significantly. Once a relatively significant decrease is detected, the method determines whether the decrease was an EPC or an inadvertent detection of double talk (DT). In particular, the method considers whether echo is effectively cancelled over a hangover period. Further, echo return loss (ERL) estimates are generated over the hangover period and compared to a lowest-possible ERL for the network. If both (1) echo cancellation is ineffective and (2) a sufficient number of ERL estimates are not below the worst-case ERL, then an EPC decision is made. If either (1) echo cancellation is effective or (2) a sufficient number of ERL estimates are below the worst-case ERL, then a DT decision is made.
摘要翻译：在一个实施例中，本发明是用于检测电信网络中的回波路径改变（EPC）的方法。该方法检测回声消除器的回声消除的有效性是否相对显着降低。一旦检测到相对显着的下降，该方法确定减少是EPC还是无意识检测双方通话（DT）。特别地，该方法考虑在宿醉期间是否有效地消除回声。此外，在宿醉期间产生回波回波损耗（ERL）估计，并与网络的最低可能的ERL进行比较。如果（1）回波消除无效，并且（2）足够数量的ERL估计不低于最差情况ERL，则作出EPC决定。如果（1）回波消除有效或（2）足够数量的ERL估计值低于最坏情况ERL，则进行DT判定。

2. 发明申请

US20060104373A1 OFDM peak-to-average power ratio reduction by combined symbol rotation and inversion with limited complexity 有权
标题翻译：通过组合符号旋转和反演减少OFDM峰均功率比，复杂度有限
公开(公告)号：US20060104373A1
公开(公告)日：2006-05-18
申请号：US10989895
申请日：2004-11-16
申请人： Yeheskel Bar-Ness , Mizhou Tan
发明人： Yeheskel Bar-Ness , Mizhou Tan
IPC分类号： H04K1/10
CPC分类号： H04L27/2617 , H04K1/00 , H04L27/2621
摘要： A signal scrambling method based on combined symbol rotation and inversion (CSRI) for the peak-to-average power ratio (PAPR) reduction of OFDM signals. By dividing OFDM sequences into subblocks and performing symbol rotation and inversion in each subblock, high degrees of freedom are available to offset the possibility of encounting poor sequences with large PAPR. In order to reduce the complexity of this scheme, two suboptimal CSRI schemes are disclosed, one based on a successive approach combined with symbol grouping, and the other based on a random approach combined with threshold control.
摘要翻译：基于组合符号旋转和反演（CSRI）的信号加扰方法，用于OFDM信号的峰均功率比（PAPR）降低。通过将OFDM序列划分为子块并在每个子块中执行符号旋转和反转，可以获得高自由度来抵消具有较大PAPR的差序列的可能性。为了降低该方案的复杂性，公开了两种次优的CSRI方案，一种是基于与符号分组相结合的连续方法，另一种基于与阈值控制相结合的随机方法。

3. 发明申请

US20050265291A1 Equal BER power control for uplink MC-CDMA with MMSE successive interference cancellation 有权
标题翻译：具有MMSE连续干扰消除的上行MC-CDMA的等效BER功率控制
公开(公告)号：US20050265291A1
公开(公告)日：2005-12-01
申请号：US11036891
申请日：2005-01-14
申请人： Yeheskel Bar-Ness , Mizhou Tan
发明人： Yeheskel Bar-Ness , Mizhou Tan
IPC分类号： H04B1/707 , H04B7/005 , H04B7/216 , H04L5/02
CPC分类号： H04L5/026 , H04B1/7105 , H04B1/71072 , H04W52/20
摘要： For a given decision order, MMSE successive interference cancellation (MMSE-SIC) can simultaneously maximize SIRs of all users. To further increase its efficiency, a power control (PC) algorithm, under equal BER criterion, is disclosed for uplink MC-CDMA. In frequency-selective Rayleigh fading channels, the MMSE-SIC integrated with the equal BER PC suppresses multiple access interference (MAI) effectively, resulting in a performance very close to the single user bound (SUB).
摘要翻译：对于给定的决策顺序，MMSE连续干扰消除（MMSE-SIC）可以同时最大化所有用户的SIR。为了进一步提高其效率，公布了用于上行链路MC-CDMA的相等BER标准下的功率控制（PC）算法。在频率选择性瑞利衰落信道中，与等BER PC集成的MMSE-SIC有效地抑制了多址接入干扰（MAI），导致与单用户绑定（SUB）的性能非常接近。

4. 发明申请

US20060171486A1 Adaptive peak windowing for crest factor reduction in a communication system transmitter 有权
公开(公告)号：US20060171486A1
公开(公告)日：2006-08-03
申请号：US11047387
申请日：2005-01-31
申请人： Mizhou Tan
发明人： Mizhou Tan
IPC分类号： H04L25/03
CPC分类号： H04L27/2624
摘要： In a communication system transmitter, a baseband processor is configured for coupling via an upconverter to an input of a power amplifier of the transmitter. The baseband processor comprises a crest factor reduction element implementing an adaptive peak windowing algorithm for application to an input signal, the adaptive peak windowing algorithm comprising a function that is adaptively adjustable for reducing interference among different peaks of the input signal.

5. 发明授权

US07634024B2 Adaptive peak windowing for crest factor reduction in a communication system transmitter 有权
标题翻译：通信系统发射机中波峰因数降低的自适应峰值窗口
公开(公告)号：US07634024B2
公开(公告)日：2009-12-15
申请号：US11047387
申请日：2005-01-31
申请人： Mizhou Tan
发明人： Mizhou Tan
IPC分类号： H04K1/02
CPC分类号： H04L27/2624
摘要： In a communication system transmitter, a baseband processor is configured for coupling via an upconverter to an input of a power amplifier of the transmitter. The baseband processor comprises a crest factor reduction element implementing an adaptive peak windowing algorithm for application to an input signal, the adaptive peak windowing algorithm comprising a function that is adaptively adjustable for reducing interference among different peaks of the input signal.
摘要翻译：在通信系统发射机中，基带处理器被配置为经由上变频器耦合到发射机的功率放大器的输入端。基带处理器包括实现用于输入信号的自适应峰值窗口化算法的波峰因数降低元件，该自适应峰值窗口算法包括可自适应调整的功能，以减少输入信号的不同峰值之间的干扰。

6. 发明授权

US07620096B2 Equal BER power control for uplink MC-CDMA with MMSE successive interference cancellation 有权
标题翻译：具有MMSE连续干扰消除的上行MC-CDMA的等效BER功率控制
公开(公告)号：US07620096B2
公开(公告)日：2009-11-17
申请号：US11036891
申请日：2005-01-14
申请人： Yeheskel Bar-Ness , Mizhou Tan
发明人： Yeheskel Bar-Ness , Mizhou Tan
IPC分类号： H04B1/713
CPC分类号： H04L5/026 , H04B1/7105 , H04B1/71072 , H04W52/20
摘要： For a given decision order, MMSE successive interference cancellation (MMSE-SIC) can simultaneously maximize SIRs of all users. To further increase its efficiency, a power control (PC) algorithm, under equal BER criterion, is disclosed for uplink MC-CDMA. In frequency-selective Rayleigh fading channels, the MMSE-SIC integrated with the equal BER PC suppresses multiple access interference (MAI) effectively, resulting in a performance very close to the single user bound (SUB).
摘要翻译：对于给定的决策顺序，MMSE连续干扰消除（MMSE-SIC）可以同时最大化所有用户的SIR。为了进一步提高其效率，公布了用于上行链路MC-CDMA的相等BER标准下的功率控制（PC）算法。在频率选择性瑞利衰落信道中，与等BER PC集成的MMSE-SIC有效地抑制了多址接入干扰（MAI），导致与单用户绑定（SUB）的性能非常接近。

7. 发明授权

US08331552B2 Detection of double talk in telecommunications networks 有权
标题翻译：检测电信网络中的双重通话
公开(公告)号：US08331552B2
公开(公告)日：2012-12-11
申请号：US12117901
申请日：2008-05-09
申请人： Mizhou Tan
发明人： Mizhou Tan
IPC分类号： H04M9/08
CPC分类号： H04B3/234 , H04M3/36 , H04M9/085
摘要： In one embodiment, the presence of double talk (DT) is detected in a telecommunications network having a near-end user and a far-end user. The energies of both (1) a signal received from the far-end user by the near-end user and (2) a signal to be communicated from the near-end user to the far-end user are computed. An echo return loss (ERL) estimate is calculated based on the energy calculations, and a preliminary decision is made as to whether DT is present based on the ERL estimate and the energy calculations. If DT is detected, then a counter is set to a hangover value. If DT is not detected, then the counter is reduced. This process is repeated, and, for each iteration, a final decision as to whether DT is present is made based on the counter value.
摘要翻译：在一个实施例中，在具有近端用户和远端用户的电信网络中检测出双重通话（DT）的存在。计算（1）远端用户从远端用户接收的信号和（2）要从近端用户传送到远端用户的信号的能量。基于能量计算计算回波回波损耗（ERL）估计，并且基于ERL估计和能量计算作出关于DT是否存在的初步决定。如果检测到DT，则将计数器设置为宿醉值。如果没有检测到DT，则计数器减少。该过程重复，并且对于每次迭代，基于计数器值进行关于DT是否存在的最终决定。

8. 发明申请

US20090279686A1 ECHO PATH CHANGE DETECTION IN TELECOMMUNICATIONS NETWORKS 有权
标题翻译：电信网络中的ECHO路径变化检测
公开(公告)号：US20090279686A1
公开(公告)日：2009-11-12
申请号：US12117943
申请日：2008-05-09
申请人： Mizhou Tan
发明人： Mizhou Tan
IPC分类号： H04M9/08
CPC分类号： H04B3/23 , H04B3/234
摘要： In one embodiment, the present invention is a method for detecting an echo path change (EPC) in a telecommunications network. The method detects whether the effectiveness of echo cancellation of an echo canceller has decreased relatively significantly. Once a relatively significant decrease is detected, the method determines whether the decrease was an EPC or an inadvertent detection of double talk (DT). In particular, the method considers whether echo is effectively cancelled over a hangover period. Further, echo return loss (ERL) estimates are generated over the hangover period and compared to a lowest-possible ERL for the network. If both (1) echo cancellation is ineffective and (2) a sufficient number of ERL estimates are not below the worst-case ERL, then an EPC decision is made. If either (1) echo cancellation is effective or (2) a sufficient number of ERL estimates are below the worst-case ERL, then a DT decision is made.
摘要翻译：在一个实施例中，本发明是用于检测电信网络中的回波路径改变（EPC）的方法。该方法检测回声消除器的回声消除的有效性是否相对显着降低。一旦检测到相对显着的下降，该方法确定减少是EPC还是无意识检测双方通话（DT）。特别地，该方法考虑在宿醉期间是否有效地消除回声。此外，在宿醉期间产生回波回波损耗（ERL）估计，并与网络的最低可能的ERL进行比较。如果（1）回波消除无效，并且（2）足够数量的ERL估计不低于最差情况ERL，则作出EPC决定。如果（1）回波消除有效或（2）足够数量的ERL估计值低于最坏情况ERL，则进行DT判定。

9. 发明申请

US20090279685A1 DETECTION OF DOUBLE TALK IN TELECOMMUNICATIONS NETWORKS 有权
标题翻译：在电信网络中检测双向通话
公开(公告)号：US20090279685A1
公开(公告)日：2009-11-12
申请号：US12117901
申请日：2008-05-09
申请人： Mizhou Tan
发明人： Mizhou Tan
IPC分类号： H04M9/08
CPC分类号： H04B3/234 , H04M3/36 , H04M9/085
摘要： In one embodiment, the presence of double talk (DT) is detected in a telecommunications network having a near-end user and a far-end user. The energies of both (1) a signal received from the far-end user by the near-end user and (2) a signal to be communicated from the near-end user to the far-end user are computed. An echo return loss (ERL) estimate is calculated based on the energy calculations, and a preliminary decision is made as to whether DT is present based on the ERL estimate and the energy calculations. If DT is detected, then a counter is set to a hangover value. If DT is not detected, then the counter is reduced. This process is repeated, and, for each iteration, a final decision as to whether DT is present is made based on the counter value.
摘要翻译：在一个实施例中，在具有近端用户和远端用户的电信网络中检测出双重通话（DT）的存在。计算（1）远端用户从远端用户接收的信号和（2）要从近端用户传送到远端用户的信号的能量。基于能量计算计算回波回波损耗（ERL）估计，并且基于ERL估计和能量计算作出关于DT是否存在的初步决定。如果检测到DT，则将计数器设置为宿醉值。如果没有检测到DT，则计数器减少。该过程重复，并且对于每次迭代，基于计数器值进行关于DT是否存在的最终决定。

10. 再颁专利

USRE41433E1 STBC MIMO-OFDM peak-to-average power ratio reduction by cross-antenna rotation and inversion 有权
标题翻译：通过横向天线旋转和反演降低STBC MIMO-OFDM峰值与平均功率比
公开(公告)号：USRE41433E1
公开(公告)日：2010-07-13
申请号：US12469010
申请日：2009-05-20
申请人： Yeheskei Bar-Ness , Mizhou Tan , Zoran Latinovic
发明人： Yeheskei Bar-Ness , Mizhou Tan , Zoran Latinovic
IPC分类号： H04J11/00
CPC分类号： H04L25/03866 , H04L1/0625 , H04L27/2614 , H04L27/3411
摘要： A signal scrambling method is provided for peak-to-average power ratio (PAPR) reduction of STBC MIMO-OFDM signals in a MIMO-OFDM system having Y transmit antenna. In general terms the OFDM sequence of symbols in said signal for each transmit antenna is divided into M sub-blocks of equal size and subclockwise subblockwise rotation and inversions are performed across all transmit antennas to generate [2Y]M permuted sequence sets from the original OFDM sequence. Based on a predetermined criteria, there is then selected from the resulting sets of OFDM sequences the one with the best PAPR properties for transmission. The predetermined criteria preferably comprises identifying maximums for all [2Y]M sequence sets, by calculating the largest PAPR value of Y sequences in each set and selecting a set with the minimum maximum for transmission.
摘要翻译：提供信号加扰方法，用于具有Y发送天线的MIMO-OFDM系统中的STBC MIMO-OFDM信号的峰均功率比（PAPR）降低。一般来说，用于每个发射天线的所述信号中的符号的OFDM序列被划分为相等大小的M个子块，并且在亚频分复用子空间中进行逆运算，并且在所有发射天线之间执行反转以从原始OFDM产生[2Y] M个置换序列集序列。基于预定标准，从所得到的OFDM序列组中选择具有最佳PAPR属性的传输序列。预定标准优选地包括通过计算每组中Y序列的最大PAPR值并选择具有最小传输限制的集合来识别所有[2Y] M个序列集的最大值。

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式