SOFT HANDOFF FOR OFDM
    91.
    发明申请
    SOFT HANDOFF FOR OFDM 有权
    OFDM的软切换

    公开(公告)号:US20090103494A1

    公开(公告)日:2009-04-23

    申请号:US12343866

    申请日:2008-12-24

    IPC分类号: H04W36/00

    摘要: The present invention relates to soft handoffs in an OFDM system. Each mobile terminal measures pilot signal strengths of transmissions from adjacent base stations. If the pilot signal strength for a base station exceeds the defined threshold, that base station is added to an active set list. Each mobile terminal notifies the base stations of their active set lists. By providing the set list to the base station controller and the servicing base station, the mobile terminal identifies the sole servicing base station or triggers a soft handoff mode when multiple base stations appear on the active set list. The soft handoff mode uses a combination of scheduling and space-time coding to affect efficient and reliable handoffs.

    摘要翻译: 本发明涉及OFDM系统中的软切换。 每个移动终端测量来自相邻基站的传输的导频信号强度。 如果基站的导频信号强度超过定义的阈值,则该基站被添加到活动集列表中。 每个移动终端向基站通知其活动集列表。 通过将设置列表提供给基站控制器和服务基站,移动终端识别唯一服务基站,或者当多个基站出现在活动集列表上时触发软切换模式。 软切换模式使用调度和时空编码的组合来影响有效和可靠的切换。

    Method and System for Retransmitting Data Packets
    92.
    发明申请
    Method and System for Retransmitting Data Packets 有权
    重新发送数据包的方法和系统

    公开(公告)号:US20090046797A1

    公开(公告)日:2009-02-19

    申请号:US11795530

    申请日:2005-12-28

    IPC分类号: H04B7/02

    CPC分类号: H04L1/0643 H04L1/1867

    摘要: A method and system are provided for minimizing errors by retransmitting packets in a multiple-input-multiple-output (MIMO) space-time coded packet radio. A packet is transmitted using a first STC code mapping, the mapping including well-known symbol operations, and optional signal weighting. When transmission errors are detected the packet is re-transmitted using STC code mappings selected in turn from a deterministic sequence of STC code mappings. The STC code mappings are chosen in accordance with one or more principles.

    摘要翻译: 提供了一种用于通过在多输入多输出(MIMO)空时编码分组无线电中重传分组来最小化错误的方法和系统。 使用第一STC码映射来发送分组,该映射包括公知的符号操作和可选的信号加权。 当检测到传输错误时,使用从确定性序列的STC码映射依次选择的STC码映射来重新发送分组。 根据一个或多个原则选择STC代码映射。

    Closed-loop MIMO systems and methods
    97.
    发明授权
    Closed-loop MIMO systems and methods 有权
    闭环MIMO系统和方法

    公开(公告)号:US08774151B2

    公开(公告)日:2014-07-08

    申请号:US13435002

    申请日:2012-03-30

    IPC分类号: H04W4/00

    摘要: Methods, devices and systems are provided for transmitting and receiving MIMO signals. In one embodiment, transmitting of the MIMO signals involves pre-coding each of at least two data symbols using a respective pre-coding codeword to preclude a corresponding plurality of pre-coded data symbols. A respective signal is transmitted from each of a plurality of antennas, the respective signal including one of the pre-coded signals and at least one pilot for use in channel estimation. The signals collectively further include at least one beacon pilot vector consisting of a respective beacon pilot per antenna, the beacon pilot vector containing contents known to a receiver for use by the receiver in determining the codeword used to pre-code the at least one data signal.

    摘要翻译: 提供了发送和接收MIMO信号的方法,设备和系统。 在一个实施例中,MIMO信号的发送涉及使用相应的预编码码字对至少两个数据符号中的每一个进行预编码,以排除相应的多个预编码数据符号。 相应的信号从多个天线中的每一个发送,各个信号包括一个预编码信号和至少一个导频,用于信道估计。 信号集体地进一步包括由每个天线的每个信标导频组成的至少一个信标导频向量,信标导频向量包含接收机已知的内容,以供接收机在确定用于对所述至少一个数据信号进行预编码的码字时使用 。

    Soft handoff for OFDM
    98.
    发明授权
    Soft handoff for OFDM 有权
    OFDM的软切换

    公开(公告)号:US08619713B2

    公开(公告)日:2013-12-31

    申请号:US12983636

    申请日:2011-01-03

    IPC分类号: H04W4/00 H04J11/00 H04J1/00

    摘要: The present invention relates to soft handoffs in an OFDM system. Each mobile terminal measures pilot signal strengths of transmissions from adjacent base stations. If the pilot signal strength for a base station exceeds the defined threshold, that base station is added to an active set list. Each mobile terminal notifies the base stations of their active set lists. By providing the set list to the base station controller and the servicing base station, the mobile terminal identifies the sole servicing base station or triggers a soft handoff mode when multiple base stations appear on the active set list. The soft handoff mode uses a combination of scheduling and space-time coding to affect efficient and reliable handoffs.

    摘要翻译: 本发明涉及OFDM系统中的软切换。 每个移动终端测量来自相邻基站的传输的导频信号强度。 如果基站的导频信号强度超过定义的阈值,则该基站被添加到活动集列表中。 每个移动终端向基站通知其活动集列表。 通过将设置列表提供给基站控制器和服务基站,移动终端识别唯一服务基站,或者当多个基站出现在活动集列表上时触发软切换模式。 软切换模式使用调度和时空编码的组合来影响有效和可靠的切换。

    Method and apparatus for channel quality measurements
    99.
    发明授权
    Method and apparatus for channel quality measurements 有权
    用于信道质量测量的方法和装置

    公开(公告)号:US08594247B2

    公开(公告)日:2013-11-26

    申请号:US13437066

    申请日:2012-04-02

    IPC分类号: H03D1/00 H04L27/06

    摘要: A method and apparatus for measuring channel quality over which has been transmitted a sequence of symbols produced by encoding and constellation mapping a source data element sequence. A sequence of received symbols is received over the channel. The sequence of received symbols is de-mapped based on a first channel quality indicator previously transmitted to a transmitter of the sequence of symbols. The de-mapped symbols are decoded to produce a decoded output sequence. In some embodiments, the decoding may be based on the first channel quality indicator. The decoded output sequence is re-encoded to produce a re-encoded output sequence. The de-mapped symbols are correlated with the re-encoded output sequence to produce a second channel quality indicator. The second channel quality indicator is transmitted to the transmitter to adaptively select a type of mapping based on the second channel quality indicator.

    摘要翻译: 一种用于测量信道质量的方法和装置,已经发送了通过对源数据元素序列进行编码和星座映射而产生的符号序列。 通过该信道接收一系列接收到的符号。 基于先前发送到符号序列的发射机的第一信道质量指示符来对接收符号的序列进行解映射。 解映射的符号被解码以产生解码的输出序列。 在一些实施例中,解码可以基于第一信道质量指示符。 解码的输出序列被重新编码以产生重新编码的输出序列。 去映射符号与重新编码的输出序列相关,以产生第二信道质量指示符。 第二信道质量指示符被发送到发射机,以基于第二信道质量指示符自适应地选择一种类型的映射。

    Methods and systems for OFDM using code division multiplexing
    100.
    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:US08588276B2

    公开(公告)日:2013-11-19

    申请号:US13333463

    申请日:2011-12-21

    IPC分类号: H04B1/707

    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。