公开(公告)号：US20050047492A1

公开(公告)日：2005-03-03

申请号：US10650547

申请日：2003-08-27

Applicant: Messay Amerga ,  Thomas Wilborn ,  Gurdeep Singh

Inventor： Messay Amerga ,  Thomas Wilborn ,  Gurdeep Singh

IPC: H04B1/707

CPC classification number: H04B1/70735 ,  H04B1/7083 ,  H04B2201/70702

Abstract: Techniques for reducing search time using known scrambling code offsets are disclosed. In one embodiment, a plurality of search results is generated by correlating a received signal with a synchronization sequence. The plurality of search results is reduced by removing any results whose offset is within a threshold of a stored offset. In another embodiment, stored offsets correspond to previously identified cells. In yet another embodiment, a searcher further correlates the received signal with a scrambling code over a search window to produce a list search result. The scrambling code may be associated with one of the cells in a neighbor list. Various other embodiments are also presented. Benefits include efficient searching which allows for improved base station selection and therefore improved performance and system capacity.

Abstract translation: 公开了使用已知的扰码偏移减少搜索时间的技术。 在一个实施例中，通过将接收的信号与同步序列相关联来产生多个搜索结果。 通过去除其偏移在所存储的偏移的阈值内的任何结果来减少多个搜索结果。 在另一个实施例中，存储的偏移对应于先前识别的小区。 在另一个实施例中，搜索者进一步将接收到的信号与搜索窗口上的扰码相关联，以产生列表搜索结果。 扰码可以与邻居列表中的一个小区相关联。 还提出了各种其它实施例。 优点包括有效的搜索，可以改善基站选择，从而提高性能和系统容量。

公开(公告)号：US06731676B2

公开(公告)日：2004-05-04

申请号：US09968344

申请日：2001-09-28

Applicant: Roland R. Rick ,  Serguei Glazko ,  Rohit Malhotra ,  Messay Amerga

Inventor： Roland R. Rick ,  Serguei Glazko ,  Rohit Malhotra ,  Messay Amerga

IPC: H04J1302

CPC classification number: H04B1/7117 ,  H04B7/0697

Abstract: An apparatus, such as a subscriber unit or a base station within a spread spectrum communication system, may add one or more additional “virtual” paths to a list of candidate paths when assigning demodulation elements. These “virtual” paths are added as candidate paths even though a corresponding peak was not necessarily detected within a received spread spectrum system. The list of paths may include a first path having a time offset approximately equal to a time offset for one of the demodulation elements, and the virtual path having a short time separation from the first path. The time separation between the paths may be, for example, less than 2 chips.

Abstract translation: 扩展频谱通信系统中的诸如用户单元或基站之类的装置在分配解调元件时可以向候选路径列表添加一个或多个附加的“虚拟”路径。 这些“虚拟”路径被添加为候选路径，即使在接收的扩频系统中不一定检测到相应的峰值。 路径列表可以包括具有近似等于解调元件之一的时间偏移的时间偏移的第一路径，并且虚拟路径具有与第一路径的短时间间隔。 路径之间的时间间隔可以是例如小于2个码片。

公开(公告)号：US08145132B2

公开(公告)日：2012-03-27

申请号：US12212064

申请日：2008-09-17

Applicant: Messay Amerga ,  Vivek Chawla ,  Deepali Garg

Inventor： Messay Amerga ,  Vivek Chawla ,  Deepali Garg

IPC: H04B15/00 ,  H04B17/00

CPC classification number: H04W48/16 ,  H04W52/0229 ,  Y02D70/1222 ,  Y02D70/1242 ,  Y02D70/1262 ,  Y02D70/142 ,  Y02D70/146 ,  Y02D70/24

Abstract: A method and apparatus for reducing frequency space from code space search is disclosed in a wireless network. The method and apparatus reduces the frequency space without compromising the probability of detection, so that user equipment can expedite system acquisition and reduce power consumption. To reduce the frequency space, the described aspects note that the power spectral density of the WCDMA signal is essentially flat within the channel bandwidth. By capturing in-phase quadrature samples and doing frequency domain analysis of the signal in bandwidth around the center frequency, to the described aspects can eliminate some channels from the WCDMA code space search during frequency scan.

Abstract translation: 在无线网络中公开了一种用于从代码空间搜索减少频率空间的方法和装置。 该方法和装置降低了频率空间，而不损害检测的概率，使得用户设备可以加快系统采集并降低功耗。 为了降低频率空间，所描述的方面注意到WCDMA信号的功率谱密度在信道带宽内基本上是平坦的。 通过捕获同相正交采样并对围绕中心频率的带宽中的信号进行频域分析，所描述的方面可以在频率扫描期间从WCDMA码空间搜索中消除一些信道。

公开(公告)号：US07877100B2

公开(公告)日：2011-01-25

申请号：US12482299

申请日：2009-06-10

Applicant: Roland R. Rick ,  Ivan Fernandez-Corbaton ,  Jeremy M. Stein ,  Messay Amerga ,  Borislav Ristic ,  Ashok Bhatia

Inventor： Roland R. Rick ,  Ivan Fernandez-Corbaton ,  Jeremy M. Stein ,  Messay Amerga ,  Borislav Ristic ,  Ashok Bhatia

IPC: H04W24/00

CPC classification number: H04W64/00 ,  G01S5/0257 ,  G01S19/48

Abstract: A position determination system and apparatus for utilizing a network of cellular base stations to determine position of a mobile station includes taking a plurality of statistically independent data measurements of the pilot signals from the base stations. Each of the data measurements includes an earliest time of arrival, providing multiple independent measurements for each of the pilot signals. For each cellular base station, a representative measurement is calculated responsive to the independent measurements, which is used to determine position of the mobile station using an AFLT algorithm and/or in conjunction with a GPS algorithm. In some embodiments, the data measurements for each pilot signal further include an RMSE estimate and time of measurement for each time of arrival, and an energy measurement for all resolvable paths. If the mobile station comprises a cell phone, a cell search list and a GPS search list may be provided by a cell base station.

Abstract translation: 用于利用蜂窝基站的网络来确定移动站的位置的位置确定系统和装置包括对来自基站的导频信号进行多个统计上独立的数据测量。 每个数据测量包括最早的到达时间，为每个导频信号提供多个独立测量。 对于每个蜂窝基站，响应于使用AFLT算法和/或结合GPS算法来确定移动站的位置的独立测量来计算代表性测量。 在一些实施例中，每个导频信号的数据测量还包括对于每个到达时间的RMSE估计和测量时间以及针对所有可解析路径的能量测量。 如果移动站包括蜂窝电话，小区搜索列表和GPS搜索列表可以由小区基站提供。

公开(公告)号：US07369534B2

公开(公告)日：2008-05-06

申请号：US10650547

申请日：2003-08-27

Applicant: Messay Amerga ,  Thomas B. Wilborn ,  Gurdeep Singh

Inventor： Messay Amerga ,  Thomas B. Wilborn ,  Gurdeep Singh

IPC: H04J3/06

CPC classification number: H04B1/70735 ,  H04B1/7083 ,  H04B2201/70702

Abstract: Techniques for reducing search time using known scrambling code offsets are disclosed. In one embodiment, a plurality of search results is generated by correlating a received signal with a synchronization sequence. The plurality of search results is reduced by removing any results whose offset is within a threshold of a stored offset. In another embodiment, stored offsets correspond to previously identified cells. In yet another embodiment, a searcher further correlates the received signal with a scrambling code over a search window to produce a list search result. The scrambling code may be associated with one of the cells in a neighbor list. Various other embodiments are also presented. Benefits include efficient searching which allows for improved base station selection and therefore improved performance and system capacity.

Abstract translation: 公开了使用已知的扰码偏移减少搜索时间的技术。 在一个实施例中，通过将接收的信号与同步序列相关联来产生多个搜索结果。 通过去除其偏移在所存储的偏移的阈值内的任何结果来减少多个搜索结果。 在另一个实施例中，存储的偏移对应于先前识别的小区。 在另一个实施例中，搜索者进一步将接收到的信号与搜索窗口上的扰码相关联，以产生列表搜索结果。 扰码可以与邻居列表中的一个小区相关联。 还提出了各种其它实施例。 优点包括有效的搜索，可以改善基站选择，从而提高性能和系统容量。

公开(公告)号：US07085537B2

公开(公告)日：2006-08-01

申请号：US10932511

申请日：2004-09-01

Applicant: Ivan J. Fernandez-Corbaton ,  Roland Rick ,  Messay Amerga

Inventor： Ivan J. Fernandez-Corbaton ,  Roland Rick ,  Messay Amerga

IPC: H04B1/00

CPC classification number: G01S19/22 ,  G01S5/0215 ,  G01S5/0273 ,  G01S5/10 ,  G01S19/40 ,  G01S19/42 ,  G01S19/428 ,  G01S19/46 ,  H04B1/1081 ,  H04B1/711 ,  H04B1/7117 ,  H04W24/00 ,  H04W84/06

Abstract: A system and method are disclosed by which the effects of time of arrival errors may be reduced. In a mobile unit, such as a CDMA device, a correlation pulse is generated when a transmitted code matches a stored reference code. In the absence of multipath effects, correlation pulses are generated in response to the detection of multiple transmissions of the reference code from multiple transmitters. However, multipath effects distort the generated correlation pulses leading to errors in the time of arrival measurements. The present invention calculates the width of the correlation pulses and determines a delay correction factor based on the pulse width. The delay correction factor is added to the measured delay time to provide a more accurate delay time, thus permitting more accurate location measurements based on time of arrival. In alternative embodiments, other signal factors may also be used to apply delay correction factors. The actual location determination may be performed by the mobile unit, or any other positioning determining entity (PDE). The system is also capable of applying correction factors to time of arrival signals received from global positioning system (GPS) satellites.

公开(公告)号：US20050032477A1

公开(公告)日：2005-02-10

申请号：US10932511

申请日：2004-09-01

Applicant: Ivan Fernandez-Corbaton ,  Roland Rick ,  Messay Amerga

Inventor： Ivan Fernandez-Corbaton ,  Roland Rick ,  Messay Amerga

IPC: G01S1/00 ,  G01S1/02 ,  G01S5/02 ,  G01S5/10 ,  G01S19/22 ,  G01S19/40 ,  G01S19/42 ,  G01S19/48 ,  H04B1/10 ,  H04B1/711 ,  H04B1/7117 ,  H04W24/00 ,  H04W28/04 ,  H04W84/06 ,  H04B15/00

CPC classification number: G01S19/22 ,  G01S5/0215 ,  G01S5/0273 ,  G01S5/10 ,  G01S19/40 ,  G01S19/42 ,  G01S19/428 ,  G01S19/46 ,  H04B1/1081 ,  H04B1/711 ,  H04B1/7117 ,  H04W24/00 ,  H04W84/06

Abstract: A system and method are disclosed by which the effects of time of arrival errors may be reduced. In a mobile unit, such as a CDMA device, a correlation pulse is generated when a transmitted code matches a stored reference code. In the absence of multipath effects, correlation pulses are generated in response to the detection of multiple transmissions of the reference code from multiple transmitters. However, multipath effects distort the generated correlation pulses leading to errors in the time of arrival measurements. The present invention calculates the width of the correlation pulses and determines a delay correction factor based on the pulse width. The delay correction factor is added to the measured delay time to provide a more accurate delay time, thus permitting more accurate location measurements based on time of arrival. In alternative embodiments, other signal factors may also be used to apply delay correction factors. The actual location determination may be performed by the mobile unit, or any other positioning determining entity (PDE). The system is also capable of applying correction factors to time of arrival signals received from global positioning system (GPS) satellites.

Abstract translation: 公开了一种可以减少到达时间错误的影响的系统和方法。 在诸如CDMA设备的移动单元中，当发送的码与存储的参考码匹配时，产生相关脉冲。 在没有多路径效应的情况下，响应于来自多个发射机的参考码的多次传输的检测而产生相关脉冲。 然而，多路径效应使所产生的相关脉冲失真导致到达时间测量的误差。 本发明计算相关脉冲的宽度，并且基于脉冲宽度确定延迟校正因子。 将延迟校正因子加到测量的延迟时间上，以提供更精确的延迟时间，从而根据到达时间进行更准确的位置测量。 在替代实施例中，也可以使用其他信号因子来应用延迟校正因子。 实际位置确定可以由移动单元或任何其他定位确定实体（PDE）执行。 该系统还能够对从全球定位系统（GPS）卫星接收的到达时间信号应用校正因子。

公开(公告)号：US06804494B2

公开(公告)日：2004-10-12

申请号：US09879074

申请日：2001-06-11

Applicant: Ivan J. Fernandez-Corbaton ,  Roland Rick ,  Messay Amerga

Inventor： Ivan J. Fernandez-Corbaton ,  Roland Rick ,  Messay Amerga

IPC: H04B110

CPC classification number: G01S19/22 ,  G01S5/0215 ,  G01S5/0273 ,  G01S5/10 ,  G01S19/40 ,  G01S19/42 ,  G01S19/428 ,  G01S19/46 ,  H04B1/1081 ,  H04B1/711 ,  H04B1/7117 ,  H04W24/00 ,  H04W84/06

Abstract: A system and method are disclosed by which the effects of time of arrival errors may be reduced. In a mobile unit, such as a CDMA device, a correlation pulse is generated when a transmitted code matches a stored reference code. In the absence of multipath effects, correlation pulses are generated in response to the detection of multiple transmissions of the reference code from multiple transmitters. However, multipath effects distort the generated correlation pulses leading to errors in the time of arrival measurements. The present invention calculates the width of the correlation pulses and determines a delay correction factor based on the pulse width. The delay correction factor is added to the measured delay time to provide a more accurate delay time, thus permitting more accurate location measurements based on time of arrival. In alternative embodiments, other signal factors may also be used to apply delay correction factors. The actual location determination may be performed by the mobile unit, or any other positioning determining entity (PDE). The system is also capable of applying correction factors to time of arrival signals received from global positioning system (GPS) satellites.

Abstract translation: 公开了一种可以减少到达时间错误的影响的系统和方法。 在诸如CDMA设备的移动单元中，当发送的码与存储的参考码匹配时，产生相关脉冲。 在没有多路径效应的情况下，响应于来自多个发射机的参考码的多次传输的检测而产生相关脉冲。 然而，多路径效应使所产生的相关脉冲失真导致到达时间测量的错误。 本发明计算相关脉冲的宽度，并且基于脉冲宽度确定延迟校正因子。 将延迟校正因子加到测量的延迟时间上，以提供更精确的延迟时间，从而根据到达时间进行更准确的位置测量。 在替代实施例中，也可以使用其他信号因子来应用延迟校正因子。 实际位置确定可以由移动单元或任何其他定位确定实体（PDE）执行。 该系统还能够对从全球定位系统（GPS）卫星接收的到达时间信号应用校正因子。

公开(公告)号：US06711420B1

公开(公告)日：2004-03-23

申请号：US09398905

申请日：1999-09-15

Applicant: Messay Amerga ,  Serguei A. Glazko ,  Baaziz Achour

Inventor： Messay Amerga ,  Serguei A. Glazko ,  Baaziz Achour

IPC: H04B138

CPC classification number: H04B1/7117 ,  H04B7/022 ,  H04B7/0491

Abstract: A method of creating a path list for use in finger assignments comprising clearing a list of paths (12), choosing a sector for consideration from an active set of sectors (14), establishing a searcher window around the sector for cosideration (16), and determining up to “n” local maxima stronger than a threshold value (18). If a sector under consideration is transmitting on supplemental channels(19), the method involves artificially biasing the findings of the searcher window by a predetermined value (20). The biasing value may be constant, variable or proportional to the number of supplemental channels on the base station. After the local maxima corresponding to base stations transmitting on supplemental channels have been biased (20), the path lists are created (21).

Abstract translation: 一种用于创建用于手指分配的路径列表的方法，包括清除路径列表（12），从活动的扇区集合（14）中选择要考虑的扇区，在所述扇区周围建立围绕所述扇区的搜索器窗口（16） 并且确定比阈值（18）更强的“n”个局部最大值。 如果正在考虑的扇区在补充信道（19）上进行发送，则该方法涉及人为地将搜索器窗口的发现偏移预定值（20）。 偏置值可以是恒定的，可变的或与基站上的补充信道的数量成比例的。 在对应于在补充信道上发送的基站的局部最大值已经被偏置（20）之后，创建路径列表（21）。

公开(公告)号：US07986661B2

公开(公告)日：2011-07-26

申请号：US11367498

申请日：2006-03-02

Applicant: Supratik Bhattacharjee ,  Messay Amerga ,  Brian Dong ,  Gurdeep Singh

Inventor： Supratik Bhattacharjee ,  Messay Amerga ,  Brian Dong ,  Gurdeep Singh

IPC: H04W4/00

CPC classification number: H04W24/10

Abstract: A terminal communicates with a first wireless network and obtains a list of cells in a second wireless network to measure. The terminal operates in a compressed mode and receives multiple transmission gap pattern sequences for different measurement purposes, e.g., RSSI measurements, BSIC identification, and BSIC re-confirmation. The terminal utilizes each transmission gap for its designated purpose or an alternate purpose. For each transmission gap, the designated purpose for the transmission gap is ascertained, and whether the transmission gap is usable for an alternate purpose is also determined based on at least one criterion. The transmission gap is used for the alternate purpose if the at least one criterion is satisfied and is used for the designated purpose otherwise. For example, a transmission gap designated for RSSI measurement may be used for BSIC identification, a transmission gap designed for BSIC identification or BSIC re-confirmation may be used for RSSI measurement, and so on.

Abstract translation: 终端与第一无线网络进行通信，并获得第二无线网络中的小区列表以进行测量。 终端以压缩模式操作并且接收用于不同测量目的的多个传输间隙模式序列，例如RSSI测量，BSIC标识和BSIC重新确认。 终端利用每个传输间隙用于其指定目的或替代目的。 对于每个传输间隙，确定传输间隙的指定目的，并且传输间隙是否可用于替代目的也基于至少一个标准来确定。 如果满足至少一个标准并且用于指定目的，则传输间隙用于替代目的。 例如，指定用于RSSI测量的传输间隙可以用于BSIC标识，为BSIC标识设计的传输间隙或BSIC重新确认可以用于RSSI测量，等等。