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公开(公告)号：US20090154388A1
公开(公告)日：2009-06-18
申请号：US12002208
申请日：2007-12-14
IPC分类号： H04H20/71
CPC分类号： H04L1/0019 , H04L1/0003 , H04L1/0026 , H04L1/0027 , H04L2001/0093
摘要： A method and apparatus of link adaptation of a broadcast system is disclosed. The method includes a base station adaptively determining a signal quality threshold. The base station broadcasts a signal, wherein the signal includes the signal quality threshold. A plurality of subscribers receives the signal, and measure a signal quality. Each of a subset of the plurality of subscribers transmits back to the base station an indicator of whether the received signal has a measured signal quality that is either above or below the signal quality threshold. A percentage of subscribers that receive the signal having a received signal quality above the signal quality threshold is estimated. A transmission modulation format and coding is selected based on the estimated percentage.
摘要翻译： 公开了广播系统的链路自适应的方法和装置。 该方法包括基站自适应地确定信号质量阈值。 基站广播信号，其中信号包括信号质量阈值。 多个用户接收信号，并测量信号质量。 多个用户的子集中的每一个向基站发送接收信号是否具有高于或低于信号质量阈值的测量信号质量的指示符。 估计接收信号质量高于信号质量阈值的信号的用户的百分比。 基于估计的百分比来选择传输调制格式和编码。
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公开(公告)号：US08654695B2
公开(公告)日：2014-02-18
申请号：US12002208
申请日：2007-12-14
IPC分类号： H04H20/71
CPC分类号： H04L1/0019 , H04L1/0003 , H04L1/0026 , H04L1/0027 , H04L2001/0093
摘要： A method and apparatus of link adaptation of a broadcast system is disclosed. The method includes a base station adaptively determining a signal quality threshold. The base station broadcasts a signal, wherein the signal includes the signal quality threshold. A plurality of subscribers receives the signal, and measure a signal quality. Each of a subset of the plurality of subscribers transmits back to the base station an indicator of whether the received signal has a measured signal quality that is either above or below the signal quality threshold. A percentage of subscribers that receive the signal having a received signal quality above the signal quality threshold is estimated. A transmission modulation format and coding is selected based on the estimated percentage.
摘要翻译： 公开了广播系统的链路自适应的方法和装置。 该方法包括基站自适应地确定信号质量阈值。 基站广播信号，其中信号包括信号质量阈值。 多个用户接收信号，并测量信号质量。 多个用户的子集中的每一个向基站发送接收信号是否具有高于或低于信号质量阈值的测量信号质量的指示符。 估计接收信号质量高于信号质量阈值的信号的用户的百分比。 基于估计的百分比来选择传输调制格式和编码。
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3.发明授权Method and apparatus for estimating frequency offset and timing offset of one or more mobile stations (MSs) 有权用于估计一个或多个移动站（MS）的频率偏移和定时偏移的方法和装置公开(公告)号：US07852909B2
公开(公告)日：2010-12-14
申请号：US12004570
申请日：2007-12-21
申请人： Rajesh Raja Manakkal , Louay Jalloul , Sam P. Alex , Anupama Lakshmanan , Djordje Tujkovic , Sriram Mudulodu
发明人： Rajesh Raja Manakkal , Louay Jalloul , Sam P. Alex , Anupama Lakshmanan , Djordje Tujkovic , Sriram Mudulodu
IPC分类号： H04B1/38
CPC分类号： H04L27/2662 , H04L5/0007 , H04L5/0051 , H04L27/2657 , H04L27/2675
摘要： A method and apparatus for estimating frequency offset and timing offset of a first Mobile Station (MS) in a communication system is provided. The method includes receiving a composite signal at a plurality of receiver antennas of a Base Transceiver Station (BTS). The composite signal includes a first signal transmitted from a first MS and a second signal transmitted from a second MS. The composite signal includes one or more tiles. Each tile includes a plurality of data sub-carriers, a plurality of first pilot sub-carriers, and a plurality of second pilot sub-carriers. A total phase offset of the first MS is estimated based on a complex conjugate product of pilot symbols of the plurality of first pilot sub-carriers. Thereafter, a first phase offset corresponding to the timing offset of the first MS is estimated based on a Power Delay Profile (PDP) of one or more first pilot sub-carriers. Finally, a second phase offset corresponding to the frequency offset of the first MS is determined based on the total phase offset and the first phase offset.
摘要翻译： 提供了一种用于估计通信系统中的第一移动台（MS）的频率偏移和定时偏移的方法和装置。 该方法包括在基站收发台（BTS）的多个接收机天线处接收复合信号。 复合信号包括从第一MS发送的第一信号和从第二MS发送的第二信号。 复合信号包括一个或多个瓦片。 每个瓦片包括多个数据副载波，多个第一导频子载波和多个第二导频子载波。 基于多个第一导频子载波的导频符号的复共轭乘积来估计第一MS的总相位偏移。 此后，基于一个或多个第一导频子载波的功率延迟曲线（PDP）来估计与第一MS的定时偏移相对应的第一相位偏移。 最后，基于总相位偏移和第一相位偏移来确定与第一MS的频率偏移相对应的第二相位偏移。
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4.发明授权Method and apparatus for estimating frequency offset and timing offset of one or more mobile stations 失效用于估计一个或多个移动台的频率偏移和定时偏移的方法和装置公开(公告)号：US08139667B2
公开(公告)日：2012-03-20
申请号：US12951185
申请日：2010-11-22
申请人： Rajesh Raja Manakkal , Louay Jalloul , Sam P. Alex , Anupama Lakshmanan , Djordje Tujkovic , Sriram Mudulodu
发明人： Rajesh Raja Manakkal , Louay Jalloul , Sam P. Alex , Anupama Lakshmanan , Djordje Tujkovic , Sriram Mudulodu
IPC分类号： H04L27/28
CPC分类号： H04L27/2662 , H04L5/0007 , H04L5/0051 , H04L27/2657 , H04L27/2675
摘要： A method and apparatus for estimating frequency offset and timing offset of a first Mobile Station (MS) in a communication system is provided. The method includes receiving a composite signal at a plurality of receiver antennas of a Base Transceiver Station (BTS). The composite signal includes a first signal transmitted from a first MS and a second signal transmitted from a second MS. The composite signal includes one or more tiles. Each tile includes a plurality of data sub-carriers, a plurality of first pilot sub-carriers, and a plurality of second pilot sub-carriers. A total phase offset of the first MS is estimated based on a complex conjugate product of pilot symbols of the plurality of first pilot sub-carriers. Thereafter, a first phase offset corresponding to the timing offset of the first MS is estimated based on a Power Delay Profile (PDP) of one or more first pilot sub-carriers. Finally, a second phase offset corresponding to the frequency offset of the first MS is determined based on the total phase offset and the first phase offset.
摘要翻译： 提供了一种用于估计通信系统中的第一移动站（MS）的频率偏移和定时偏移的方法和装置。 该方法包括在基站收发台（BTS）的多个接收机天线处接收复合信号。 复合信号包括从第一MS发送的第一信号和从第二MS发送的第二信号。 复合信号包括一个或多个瓦片。 每个瓦片包括多个数据副载波，多个第一导频子载波和多个第二导频子载波。 基于多个第一导频子载波的导频符号的复共轭乘积来估计第一MS的总相位偏移。 此后，基于一个或多个第一导频子载波的功率延迟曲线（PDP）来估计与第一MS的定时偏移相对应的第一相位偏移。 最后，基于总相位偏移和第一相位偏移来确定与第一MS的频率偏移相对应的第二相位偏移。
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5.发明授权Method and system for time synchronization of WiMAX and LTE-TDD networks 有权WiMAX和LTE-TDD网络时间同步的方法和系统公开(公告)号：US09107077B2
公开(公告)日：2015-08-11
申请号：US13189254
申请日：2011-07-22
摘要： Embodiments of a method and system for supporting co-existence of first and second cellular networks in adjacent channels in the same geographical area are provided. The method and system synchronize the two cellular networks such that their respective uplink transmissions are aligned in time and their respective downlink transmissions are aligned in time. Such synchronization prevents (or substantially prevents) the uplink transmissions from one of the two cellular networks from overlapping with the downlink transmissions of the other cellular network, and vice versa, thereby mitigating interference between the two networks.
摘要翻译： 提供了用于支持同一地理区域中的相邻信道中的第一和第二蜂窝网络的共存的方法和系统的实施例。 该方法和系统使两个蜂窝网络同步，使得它们各自的上行链路传输在时间上对准，并且它们各自的下行链路传输在时间上对准。 这种同步防止（或基本上防止）来自两个蜂窝网络之一的上行链路传输与其他蜂窝网络的下行链路传输重叠，反之亦然，从而减轻了两个网络之间的干扰。
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公开(公告)号：US20090316636A1
公开(公告)日：2009-12-24
申请号：US12456562
申请日：2009-06-18
IPC分类号： H04W74/00
CPC分类号： H04W72/085 , H04L1/002 , H04L5/0007 , H04L5/006 , H04L5/0094
摘要： Embodiments for a method and apparatus of selecting a transmission mode between the subscriber and a base station are disclosed. One method includes determining a predictive window. Instantaneous channel quality measurements are averaged, wherein the averaging is dependent upon a size of the predictive window. A first estimate of the transmission mode is determined based on the averaged instantaneous channel quality measurements. A margin is calculated based on reception of a qualifying downlink transmission. The transmission mode is selected by updating the first estimate with the margin.
摘要翻译： 公开了在用户和基站之间选择传输模式的方法和装置的实施例。 一种方法包括确定预测窗口。 对瞬时信道质量测量进行平均，其中平均取决于预测窗口的大小。 基于平均的瞬时信道质量测量来确定传输模式的第一估计。 基于合格的下行链路传输的接收来计算余量。 通过用余量更新第一估计来选择传输模式。
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公开(公告)号：US20130072191A1
公开(公告)日：2013-03-21
申请号：US13620449
申请日：2012-09-14
CPC分类号： H04W36/30 , H04B17/26 , H04B17/318 , H04B17/382 , H04W24/08
摘要： A method and apparatus of determining a hand-off metric are disclosed. One method includes a subscriber receiving identifications of a neighboring set of base stations from a serving base station, determining an active set of base stations by measuring received signal power from each of the base stations of the neighboring set at first discrete points in time, averaging the received signal power for each of these base stations, and selecting the active set based on the average received signal power. Determining the hand-off metric further includes calculating a ratio of average receive signal power to average excess received signal power, for each base station of the active set, wherein the excess received signal power includes signal power received by the subscriber in excess of power received from the base station.
摘要翻译： 公开了一种确定越区切换度量的方法和装置。 一种方法包括用户从服务基站接收相邻的基站集合的标识，通过在第一离散时间点测量来自相邻集合的每个基站的接收信号功率来确定基站的活动集合，平均 每个这些基站的接收信号功率，以及基于平均接收信号功率选择有效集合。 确定越区切换度量还包括计算有源集合的每个基站的平均接收信号功率与平均多余的接收信号功率的比率，其中多余的接收信号功率包括由用户接收的超过接收的功率的信号功率 从基站。
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8.发明授权Downlink coordinated transmission in OFDMA systems, including WiMax systems 失效OFDMA系统中的下行协调传输，包括WiMax系统公开(公告)号：US07764658B2
公开(公告)日：2010-07-27
申请号：US11725920
申请日：2007-03-20
IPC分类号： H04J3/00
CPC分类号： H04L5/0058 , H04L5/0023 , H04L5/0037 , H04L5/023 , H04L27/2608 , H04W16/10 , H04W16/24 , H04W72/082 , H04W72/085
摘要： Embodiments described herein include methods for improving the SINR, and therefore communication quality or rate, in the downlink of a cellular communication system. In an embodiment, the system is an orthogonal-frequency-division multiple-access (OFDMA) system. In an embodiment, a set of terminals is designated a coordinated-transmission group. The set of terminal is chosen such that the slot-allocations of the set are given special treatment to alleviate interference from other sectors or cells. In an embodiment, “zones” defined in the WiMax standard are “repurposed” to handle the coordinated-transmission, although the zone was originally intended for another purpose.
摘要翻译： 本文描述的实施例包括用于在蜂窝通信系统的下行链路中改善SINR以及因此通信质量或速率的方法。 在一个实施例中，该系统是正交频分多址（OFDMA）系统。 在一个实施例中，一组终端被指定为协调传输组。 选择终端的集合，使得该组的时隙分配被给予特殊处理以减轻来自其他扇区或小区的干扰。 在一个实施例中，WiMax标准中定义的“区域”被“重新利用”以处理协调传输，尽管该区域原本是为了另一目的。
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公开(公告)号：US07706335B2
公开(公告)日：2010-04-27
申请号：US11725919
申请日：2007-03-20
IPC分类号： H04J3/00
CPC分类号： H04L5/0058 , H04L5/0023 , H04L5/0037 , H04L5/023 , H04L27/2608 , H04W16/10 , H04W16/24 , H04W72/082 , H04W72/085
摘要： Embodiments described herein include methods for improving the SINR, and therefore communication quality or rate, in the downlink of a cellular communication system. In an embodiment, the system is an orthogonal-frequency-division multiple-access (OFDMA) system. In an embodiment, a set of terminals is designated a coordinated-transmission group. The set of terminal is chosen such that the slot-allocations of the set are given special treatment to alleviate interference from other sectors or cells. All terminals within a coordination group generally use the same slot, but embodiments are not so limited.
摘要翻译： 本文描述的实施例包括用于在蜂窝通信系统的下行链路中改善SINR以及因此通信质量或速率的方法。 在一个实施例中，该系统是正交频分多址（OFDMA）系统。 在一个实施例中，一组终端被指定为协调传输组。 选择终端的集合，使得该组的时隙分配被给予特殊处理以减轻来自其他扇区或小区的干扰。 协调组中的所有终端通常使用相同的时隙，但实施例不限于此。
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10.发明申请公开(公告)号：US20080239938A1
公开(公告)日：2008-10-02
申请号：US11731714
申请日：2007-03-30
申请人： Louay Jalloul , Djordje Tujkovic , Vummintala Shashidhar , Bertrand Hochwald , Arogyaswami Paulraj
发明人： Louay Jalloul , Djordje Tujkovic , Vummintala Shashidhar , Bertrand Hochwald , Arogyaswami Paulraj
IPC分类号： H04J1/12
CPC分类号： H04W72/082 , H04B7/0491 , H04L5/023 , H04L2025/03414 , H04L2025/03426 , H04W52/24 , H04W52/241 , H04W52/243
摘要： Embodiments disclose a method of coordinating reception of uplink transmissions in order to reduce interference among transceivers in an OFDM wireless transmission system, or similar communication system, including a number of receivers communicating with one or more basestations in cell or sector arrangements. A basestation within each sector includes an uplink coordinated reception process that imposes coordinated reception techniques across sector or cell boundaries in order to improve uplink transmission quality between target terminals and basestations within each sector.
摘要翻译： 实施例公开了一种协调上行链路传输的接收的方法，以便减少OFDM无线传输系统中的收发器之间的干扰，或者类似的通信系统，包括与小区或扇区布置中的一个或多个基站通信的多个接收机。 每个扇区内的基站包括上行链路协调接收过程，其跨扇区或小区边界施加协调的接收技术，以便改善目标终端与每个扇区内的基站之间的上行传输质量。
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