利索-全球专利检索

  1. 登录
  2. 注册

搜索结果

145 条记录 (耗时 0.044 秒)

    Pilot signal searching technique for a cellular communications system
    1.
    发明授权
    Pilot signal searching technique for a cellular communications system 失效
    蜂窝通信系统的导频信号搜索技术

    公开(公告)号：US5577022A

    公开(公告)日：1996-11-19

    申请号：US344321

    申请日：1994-11-22

    申请人： Roberto Padovani ,  Walid M. Hamdy ,  Gil Bar-David

    发明人： Roberto Padovani ,  Walid M. Hamdy ,  Gil Bar-David

    IPC分类号： H04B1/707 ,  H04B7/26 ,  H04W36/30 ,  H04B7/216 ,  H04J13/02 ,  H04L27/30

    CPC分类号： H04W36/30 ,  H04B1/707 ,  H04B7/2637

    摘要： An improved method and system for performing a pilot signal searching operation in anticipation of handoff in mobile station communication between base stations is disclosed herein. The searching operation is described herein as being implemented within a cellular communication system which uses code division multiple access (CDMA) modulation techniques. The mobile station maintains a list of an Active Set of pilot signals transmitted from base stations with which the mobile station is to communicate through, and a Neighbor Set of pilots from base stations within a predetermined proximity of the mobile station. In addition to the Neighbor and Active Sets of pilots, the mobile station maintains a list of Candidate and Pre-Candidate Sets of pilots. Based on analysis of the signal strength of the pilot signals received at the mobile station, base station entries from the Neighbor Set may be assigned to the Pre-Candidate and Candidate Sets, and eventually to the Active set. The searching operation contemplates comparing pilot signal strength measurements corresponding to each base station entry within the Neighbor Set to a first predetermined level. One or more entries from the Neighbor Set having a base station signal strength measurement greater than the first predetermined level may be placed in the Pre-Candidate Set. The strength of the pilot signals associated with entries in the Pre-Candidate Set are then further evaluated to determine eligibility within the Candidate Set, from which are selected the entries comprising the Active Set.

    摘要翻译： 这里公开了一种用于在预期基站之间的移动台通信中切换的执行导频信号搜索操作的改进方法和系统。 搜索操作在本文中被描述为在使用码分多址（CDMA）调制技术的蜂窝通信系统内实现。 移动台维护从移动台要与之进行通信的基站发送的导频信号的活动集的列表，以及来自移动台的预定接近范围内的基站的导频的相邻集合。 除了邻近和有效的飞行员组外，移动台还保留有候选和预先考虑的飞行员组列表。 基于在移动站处接收的导频信号的信号强度的分析，可以将来自邻居集的基站条目分配给预先考虑和候选集，并最终分配给活动集。 搜索操作考虑将对应于相邻集合内的每个基站条目的导频信号强度测量值与第一预定电平进行比较。 具有大于第一预定水平的基站信号强度测量的来自邻居集合的一个或多个条目可以被放置在预先考虑集合中。 然后进一步评估与候选集中的条目相关联的导频信号的强度，以确定候选集中的资格，从中选择包含活动集的条目。

    Method and apparatus for canceling pilot interference in a wireless communication system
    2.
    发明授权
    Method and apparatus for canceling pilot interference in a wireless communication system 有权
    用于消除无线通信系统中的导频干扰的方法和装置

    公开(公告)号：US08644264B2

    公开(公告)日：2014-02-04

    申请号：US12900394

    申请日：2010-10-07

    申请人： Alessandro Vanelli Coralli ,  Henry David Pfister ,  Jilei Hou ,  John Edward Smee ,  Roberto Padovani ,  Brian K. Butler ,  Jeffrey A. Levin ,  Thomas B. Wilborn ,  Paul E. Bender

    发明人： Alessandro Vanelli Coralli ,  Henry David Pfister ,  Jilei Hou ,  John Edward Smee ,  Roberto Padovani ,  Brian K. Butler ,  Jeffrey A. Levin ,  Thomas B. Wilborn ,  Paul E. Bender

    IPC分类号： H03D1/04

    CPC分类号： H04B1/7107 ,  H04B2201/70701

    摘要： Methods and systems for estimating and canceling pilot interference in a wireless (e.g., CDMA) communication system. In one method, a received signal comprised of a number of signal instances, each including a pilot, is initially processed to provide data samples. Each signal instance's pilot interference may be estimated by despreading the data samples with a spreading sequence for the signal instance, channelizing the despread data to provide pilot symbols, filtering the pilot symbols to estimate the channel response of the signal instance, and multiplying the estimated channel response with the spreading sequence. The pilot interference estimates due to a plurality of interfering multipaths are accumulated to derive the total pilot interference, which is subtracted from the data samples to provide pilot-canceled data samples. These samples are then processed to derive demodulated data for each of at least one (desired) signal instance in the received signal.

    摘要翻译： 用于估计和消除无线（例如，CDMA）通信系统中的导频干扰的方法和系统。 在一种方法中，最初处理包括多个信号实例（每个包括导频）的接收信号以提供数据样本。 每个信号实例的导频干扰可以通过用信号实例的扩展序列解扩数据样本来估计，对解扩数据进行信道化以提供导频符号，对导频符号进行滤波以估计信号实例的信道响应，并将估计信道 响应与扩展序列。 由多个干扰多径导致的导频干扰估计被累加以导出总导频干扰，其从数据样本中减去以提供导频取消的数据采样。 然后处理这些样本以便为接收信号中的至少一个（期望的）信号实例中的每一个导出解调数据。

    PN generators for spread spectrum communications systems
    3.
    发明授权
    PN generators for spread spectrum communications systems 有权
    用于扩频通信系统的PN发生器

    公开(公告)号：US08611310B2

    公开(公告)日：2013-12-17

    申请号：US10659831

    申请日：2003-09-10

    申请人： Peter J. Black ,  Roberto Padovani ,  Lindsay A. Weaver, Jr.

    发明人： Peter J. Black ,  Roberto Padovani ,  Lindsay A. Weaver, Jr.

    IPC分类号： H04B7/216 ,  H04B1/69

    CPC分类号： H04J13/10 ,  H03K3/84 ,  H04B1/707 ,  H04J13/0022

    摘要： Techniques to improve the acquisition process in a spread spectrum environment. The signals from different CDMA systems are spread with different sets of PN sequences, with the PN sequences in each set being uncorrelated to the PN sequences in the other sets. The mobile station can attempt to acquire the pilot signal by processing the received signal with a first set of PN sequences corresponding to a first hypothesis of the particular signal being acquired. If acquisition of the pilot signal fails, a second set of PN sequences corresponding to a second hypothesis is selected and used to process the received signal. The PN sequences in the second set are uncorrelated to the PN sequences in the first set.

    摘要翻译： 在扩展频谱环境中改进采集过程的技术。 来自不同CDMA系统的信号用不同的PN序列集合扩展，每组中的PN序列与其他集合中的PN序列不相关。 移动台可以尝试通过用对应于所获取的特定信号的第一假设的第一组PN序列处理接收信号来获取导频信号。 如果导频信号的获取失败，则选择对应于第二假设的第二组PN序列来处理接收到的信号。 第二组中的PN序列与第一组中的PN序列不相关。

    Method and apparatus for robust handoff in wireless communication systems
    4.
    发明授权
    Method and apparatus for robust handoff in wireless communication systems 有权
    无线通信系统中鲁棒切换的方法和装置

    公开(公告)号：US08588777B2

    公开(公告)日：2013-11-19

    申请号：US11619550

    申请日：2007-01-03

    申请人： Matthew Stuart Grob ,  Roberto Padovani ,  Paul E. Bender ,  Gadi Karmi ,  Robert H. Kimball ,  Greg M. Hoagland

    发明人： Matthew Stuart Grob ,  Roberto Padovani ,  Paul E. Bender ,  Gadi Karmi ,  Robert H. Kimball ,  Greg M. Hoagland

    IPC分类号： H04W36/00

    CPC分类号： H04W36/18 ,  H04B17/318 ,  H04W36/30

    摘要： A communication system that allows a soft handoff to be completed, even when the communications link between the active base station and the mobile station deteriorates before the mobile station has received the handoff direction message. The mobile station maintains a list of base stations that the mobile station is in communication with, referred to as an “Active Set”. In addition, the mobile station maintains another list of base stations that are proximate to the base stations in the active set. This list is referred to as the “Neighbor Set”. In accordance with the disclosed method and apparatus, the mobile station places a base station in the active set upon including the base station in a pilot strength measurement message (PSMM). The mobile station monitors transmissions from all of the base stations on the active set to receive a handoff direction message (HDM).

    摘要翻译： 即使在移动台已经接收到切换方向消息之前，即使当活动基站和移动台之间的通信链路恶化时，也能够完成软越区切换的通信系统。 移动台保持移动台与之通信的基站的列表，称为“活动集”。 此外，移动站维护在活动集合中靠近基站的另一个基站列表。 该列表被称为“邻居集”。 根据所公开的方法和装置，移动台在将基站包括在导频强度测量消息（PSMM）中时将基站放置在活动集中。 移动站监视来自主动集合上的所有基站的传输以接收切换方向消息（HDM）。

    APPARATUS AND METHOD FOR REDUCING MESSAGE COLLISION BETWEEN MOBILE STATIONS SIMULTANEOUSLY ACCESSING A BASE STATION IN A CDMA CELLULAR COMMUNICATIONS SYSTEM
    8.
    发明申请
    APPARATUS AND METHOD FOR REDUCING MESSAGE COLLISION BETWEEN MOBILE STATIONS SIMULTANEOUSLY ACCESSING A BASE STATION IN A CDMA CELLULAR COMMUNICATIONS SYSTEM 失效
    CDMA CDMA蜂窝通信系统中同步接入基站的移动台之间的消息冲突降低的装置和方法

    公开(公告)号：US20070274267A1

    公开(公告)日：2007-11-29

    申请号：US11622403

    申请日：2007-01-11

    申请人： Edward Tiedemann ,  Lindsay Weaver ,  Roberto Padovani

    发明人： Edward Tiedemann ,  Lindsay Weaver ,  Roberto Padovani

    IPC分类号： H04B7/216

    CPC分类号： H04W74/0841 ,  H04B1/707 ,  H04B1/7103 ,  H04B7/2628 ,  H04B2201/709709 ,  H04J13/0022 ,  H04J13/10 ,  H04J13/16 ,  H04L1/188 ,  H04L1/1887 ,  H04W52/48 ,  H04W52/50 ,  H04W74/002 ,  H04W74/08 ,  H04W74/0833 ,  H04W74/0866

    摘要： Collisions between messages simultaneously transmitted by multiple spread-spectrum transmitters are reduced by distributing the transmissions over the available resources of the receiver. Each mobile station in a CDMA system uses one or more randomization methods to distribute its transmissions. In the first randomization, the mobile station time-delays its transmissions by a number of chips of the PN code with which it spreads the transmitted signal. In a second randomization, the mobile station randomly selects the PN code. In a third randomization, the mobile station inserts a random delay between successive message transmissions or probes if it does not receive an acknowledgement after a predetermined timeout period. A predetermined number of such transmissions is called a probe sequence. In a fourth randomization, the mobile station inserts a relatively long random delay between successive probe sequences if it does not receive an acknowledgement of any probe in the sequence.

    摘要翻译： 通过在接收机的可用资源上分发传输来减少由多个扩频发射机同时发送的消息之间的冲突。 CDMA系统中的每个移动站使用一种或多种随机化方法来分发其传输。 在第一次随机化中，移动台通过PN码的多个码片对其发送进行时间延迟，并通过该芯片扩展发送的信号。 在第二随机化中，移动台随机选择PN码。 在第三次随机化中，如果移动台在预定的超时时段之后没有接收到确认，则在连续的消息传输或探测之间插入随机延迟。 预定数量的这种传输被称为探测序列。 在第四随机化中，如果移动台在序列中没有接收到任何探测器的确认，则在连续探测序列之间插入相对长的随机延迟。

    Pilot reference transmission for a wireless communication system
    9.
    发明授权
    Pilot reference transmission for a wireless communication system 有权
    无线通信系统的导频参考传输

    公开(公告)号：US07289473B1

    公开(公告)日：2007-10-30

    申请号：US09702142

    申请日：2000-10-30

    申请人： Roberto Padovani ,  Peter J. Black ,  Nagabhushana T. Sindhushayana

    发明人： Roberto Padovani ,  Peter J. Black ,  Nagabhushana T. Sindhushayana

    IPC分类号： H04Q7/00 ,  H04J3/06

    CPC分类号： H04B1/707 ,  H04B2201/70701

    摘要： A pilot reference transmission scheme well suited for high data rate wireless communication systems is disclosed. To maximize the amount of interference from transmissions from neighboring transmission sources (e.g., access points or base stations) during the pilot interval, and hence minimize the amount of interference from non-transmitting sources during the data intervals, the pilot references are transmitted in bursts at predetermined time intervals, and the pilot bursts from the access points are synchronized. This results in maximum interference contributions from non-transmitting neighboring access points, facilitating reliable estimation of worst case carrier-to-interference (C/I), and further allows the receiving devices (e.g., access terminals) to easily recognize the bursts as pilot reference. In one embodiment, each access point transmits the pilot bursts at or near its maximum transmit power level and no user-specific data is transmitted during the pilot bursts.

    摘要翻译： 公开了一种非常适合高数据速率无线通信系统的导频参考传输方案。 为了在导频间隔期间使来自相邻传输源（例如，接入点或基站）的传输的干扰量最大化，并且因此在数据间隔期间最小化来自非发射源的干扰量，导频参考以突发 并且来自接入点的导频突发是同步的。 这导致来自非发射相邻接入点的最大干扰贡献，促进对最差情况下的载波干扰（C / I）的可靠估计，并且还允许接收设备（例如，接入终端）容易地将突发识别为导频 参考。 在一个实施例中，每个接入点在其最大发射功率电平处或其附近发射导频脉冲串，并且在导频突发期间不发送用户特定数据。

    Reverse link interference cancellation
    10.
    发明申请
    Reverse link interference cancellation 有权
    反向链路干扰消除

    公开(公告)号：US20070040704A1

    公开(公告)日：2007-02-22

    申请号：US11334977

    申请日：2006-01-18

    申请人： John Smee ,  Jilei Hou ,  Roberto Padovani ,  Peter Black ,  Kenneth Easton

    发明人： John Smee ,  Jilei Hou ,  Roberto Padovani ,  Peter Black ,  Kenneth Easton

    IPC分类号： B64D47/06

    CPC分类号： H04B1/7107 ,  H04W52/12

    摘要： A method and system for reverse link interference cancellation. One method comprises demodulating and decoding at least one signal sent from at least one access terminal and received by a first base station, sending demodulated, decoded information of the signal to a second base station, reconstructing the signal at the second base station, and subtracting the reconstructed signal from a buffer at the second base station.

    摘要翻译： 一种用于反向链路干扰消除的方法和系统。 一种方法包括对从至少一个接入终端发送并由第一基站接收的至少一个信号进行解调和解码，向第二基站发送解调后的解码的信号信息，重构第二基站的信号，以及减去 来自第二基站的缓冲器的重建信号。