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479 条记录 (耗时 0.052 秒)

    Soft handoff in OFDMA system
    41.
    发明授权
    Soft handoff in OFDMA system 有权
    OFDMA系统中的软切换

    公开(公告)号：US08165094B2

    公开(公告)日：2012-04-24

    申请号：US13221601

    申请日：2011-08-30

    申请人： Jianglei Ma ,  Wen Tong ,  Ming Jia ,  Peiying Zhu ,  Mo-Han Fong ,  Hang Zhang

    发明人： Jianglei Ma ,  Wen Tong ,  Ming Jia ,  Peiying Zhu ,  Mo-Han Fong ,  Hang Zhang

    IPC分类号： H04W36/00

    CPC分类号： H04W36/18 ,  H04B7/022 ,  H04B7/0691

    摘要： Soft handoff in an OFDMA system is disclosed. If the pilot signal strength for a base station exceeds the defined threshold, the base station is added to an active set list. Subcarriers in a plurality of orthogonal frequency division multiplexing (OFDM) symbols are divided and allocated into subchannels. The OFDM symbols are divided and multiplexed. A soft handoff zone with a first dimension of the subchannels and a second dimension of the divided and multiplexed OFDM symbols is defined. The soft handoff zone has subcarriers with a subchannel definition, for example, an identical permutation.

    摘要翻译： 披露了OFDMA系统中的软切换。 如果基站的导频信号强度超过定义的阈值，则将基站添加到活动集列表中。 多个正交频分复用（OFDM）符号中的子载波被划分并分配给子信道。 OFDM符号被分割和多路复用。 定义了具有子信道的第一维度和分割和多路复用的OFDM符号的第二维度的软切换区域。 软切换区具有子信道定义的子载波，例如相同的置换。

    Adaptive scheduling of voice traffic in a multi-carrier communication environment
    42.
    发明授权
    Adaptive scheduling of voice traffic in a multi-carrier communication environment 有权
    多载波通信环境中语音流量的自适应调度

    公开(公告)号：US08165009B2

    公开(公告)日：2012-04-24

    申请号：US10599103

    申请日：2005-03-24

    申请人： Jianming Wu ,  Wen Tong ,  Peiying Zhu

    发明人： Jianming Wu ,  Wen Tong ,  Peiying Zhu

    IPC分类号： H04J11/00

    CPC分类号： H04W72/12 ,  H04L1/0009 ,  H04L1/08 ,  H04L1/1867 ,  H04L5/0007 ,  H04L5/0037 ,  H04L5/006 ,  H04L5/0064 ,  H04W28/26 ,  H04W72/085 ,  H04W72/1263

    摘要： The present invention provides a technique for scheduling data, and in particular, scheduling real-time or voice data for transmissions during a transmit time interval in a multi-carrier communication environment. For each transmit time interval, channel condition indicia for multiple users is determined, and an iterative scheduling process is then implemented based in part on the channel condition indicia. The iterative scheduling initially preassigns select tones for each of the remaining users that have not been permanently assigned tones for the given transmit time interval. Next, the remaining user having the least favorable channel conditions is selected as an active user. The newly selected active user is then permanently assigned the select tones that were initially pre-assigned to that particular user. The permanently assigned tones are removed from consideration, and the process is repeated until all the remaining users are permanently assigned unique tones for scheduling.

    摘要翻译： 本发明提供了一种用于调度数据的技术，特别是在多载波通信环境中的传输时间间隔期间调度实时或话音数据以进行传输。 对于每个发送时间间隔，确定多个用户的信道条件标记，并且部分地基于信道条件标记来实现迭代调度过程。 迭代调度最初预分配对于给定发送时间间隔未被永久分配的音调的剩余用户中的每一个选择音调。 接下来，选择具有最不利条件的剩余用户作为活动用户。 然后，将新选择的活动用户永久分配给最初预分配给该特定用户的选择音。 从考虑中删除永久分配的音调，并重复该过程，直到所有剩余用户被永久分配唯一的音调进行调度。

    Communication signal decoding and soft demapping methods and systems
    43.
    发明授权
    Communication signal decoding and soft demapping methods and systems 有权
    通信信号解码和软解映射方法和系统

    公开(公告)号：US08116410B1

    公开(公告)日：2012-02-14

    申请号：US10913403

    申请日：2004-08-09

    申请人： Ming Jia ,  Peiying Zhu ,  Wen Tong ,  Jianglei Ma

    发明人： Ming Jia ,  Peiying Zhu ,  Wen Tong ,  Jianglei Ma

    IPC分类号： H04L27/06

    CPC分类号： H04L25/02 ,  H04L25/03318 ,  H04L2025/03426 ,  H04L2025/03624

    摘要： Symbol detection and soft dempapping methods and systems are provided. Individual subset symbol detection according to an embodiment of the invention involves identifying a search subset of a transmission symbol set for a transmission symbol. For each other transmission symbol in communication signals, multiple search subsets of the transmission symbol set are identified. The multiple search subsets include respective search subsets based on each transmission symbol in either the search subset for the first identified one of the transmission symbols or each of the multiple search subsets identified for a different one of the other transmission symbols. Symbol detection errors may be detected by identifying competing symbols and computing competing distances. Soft demapping may be provided by calculating soft decision results based on detected symbols and weighting the soft decision result.

    摘要翻译： 提供符号检测和软解压方法和系统。 根据本发明的实施例的个体子集符号检测涉及识别用于传输符号的传输符号组的搜索子集。 对于通信信号中的每个其他传输符号，识别传输符号集合的多个搜索子集。 多个搜索子集包括基于针对第一被识别的一个传输符号的搜索子集中的每个传输符号或为其它传输符号中的不同一个标识的多个搜索子集中的每一个的每个传输符号。 可以通过识别竞争符号和计算竞争距离来检测符号检测错误。 可以通过基于检测到的符号计算软判定结果并对软决策结果加权来提供软解映射。

    Methods and systems for OFDM using code division multiplexing
    44.
    发明授权
    Methods and systems for OFDM using code division multiplexing 有权
    使用码分复用的OFDM方法和系统

    公开(公告)号：US08111763B2

    公开(公告)日：2012-02-07

    申请号：US11910091

    申请日：2006-03-30

    申请人： Jianglei Ma ,  Ming Jia ,  Wen Tong ,  Peiying Zhu ,  Hua Xu ,  Hang Zhang ,  Mo-Han Fong

    发明人： Jianglei Ma ,  Ming Jia ,  Wen Tong ,  Peiying Zhu ,  Hua Xu ,  Hang Zhang ,  Mo-Han Fong

    IPC分类号： H04L27/28

    CPC分类号： H04J13/0003 ,  H04B1/707 ,  H04B7/0404 ,  H04B7/0678 ,  H04J13/00 ,  H04J13/16 ,  H04L5/0016 ,  H04L5/0026 ,  H04L5/0048 ,  H04L5/005 ,  H04L25/0204 ,  H04L25/0226 ,  H04L25/0232 ,  H04L25/03866 ,  H04L27/2613 ,  H04L27/2627 ,  H04W72/044

    摘要： In some embodiments of the invention, OFDM symbols are transmitted as a plurality of clusters. A cluster includes a plurality of OFDM sub-carriers in frequency, over a plurality of OFDM symbol durations in time. Each cluster includes data as well as pilot information as a reference signal for channel estimation. In some embodiments, a plurality of clusters collectively occupy the available sub-carrier set in the frequency domain that is used for transmission. In some embodiments of the invention data and/or pilots are spread within each cluster using code division multiplexing (CDM). In some embodiments pilots and data are separated by distributing data on a particular number of the plurality of OFDM symbol durations and pilots on a remainder of the OFDM symbol durations. CDM spreading can be performed in time and/or frequency directions.

    摘要翻译： 在本发明的一些实施例中，OFDM符号作为多个簇发送。 在多个OFDM符号持续时间内，群集包括频率上的多个OFDM子载波。 每个簇包括数据以及作为信道估计的参考信号的导频信息。 在一些实施例中，多个集群共同地占用用于传输的频域中的可用子载波集合。 在本发明的一些实施例中，使用码分多路复用（CDM）在每个簇内扩展数据和/或导频。 在一些实施例中，通过在OFDM码元持续时间的其余部分上分配关于多个OFDM符号持续时间的特定数目和导频上的数据来分离导频和数据。 可以在时间和/或频率方向上执行CDM扩展。

    Methods and systems for transmission of orthogonal frequency division multiplexed symbols
    50.
    发明授权
    Methods and systems for transmission of orthogonal frequency division multiplexed symbols 有权
    用于传输正交频分复用符号的方法和系统

    公开(公告)号：US07813261B2

    公开(公告)日：2010-10-12

    申请号：US11887115

    申请日：2006-03-30

    申请人： Jianglei Ma ,  Hang Zhang ,  Wen Tong ,  Peiying Zhu ,  Ming Jia

    发明人： Jianglei Ma ,  Hang Zhang ,  Wen Tong ,  Peiying Zhu ,  Ming Jia

    IPC分类号： H04J11/00 ,  H04J3/26 ,  H04H20/71 ,  H04L23/02

    CPC分类号： H04L27/2602 ,  H04L1/0003 ,  H04L1/0009 ,  H04L27/2655

    摘要： In some embodiments of the present invention there is provided a frame structure for transmitting an integer number of OFDM symbols in which some of the OFDM symbols are to be transmitted in a unicast format and some of the OFDM symbols are to be transmitted in a broadcast format. The frame structure includes partitioning of a frame into at least two portions to accommodate both unicast and broadcast modes in the frame. The frame structure is used for transmitting multiple frames in a serial manner from at least one transmitter. The unicast mode supports transmission of OFDM symbols from a single transmitter to a single receiver. The broadcast mode supports transmission of OFDM symbols from multiple transmitters to all receivers within range of the multiple transmitters. The multicast mode supports transmission of OFDM symbols from multiple transmitters to multiple receivers within range of the multiple transmitters.

    摘要翻译： 在本发明的一些实施例中，提供了一种用于发送整数个OFDM符号的帧结构，其中一些OFDM符号将以单播格式发送，并且一些OFDM符号将以广播格式发送 。 帧结构包括将帧划分成至少两个部分以适应帧中的单播和广播模式。 帧结构用于从至少一个发射机以串行方式发送多个帧。 单播模式支持将OFDM符号从单个发射机传输到单个接收机。 广播模式支持从多个发射机向多个发射机的范围内的所有接收机传输OFDM符号。 组播模式支持将多个发射机的OFDM符号从多个发射机的范围内传输到多个接收机。