Zones for wireless networks with relays
    31.
    发明授权
    Zones for wireless networks with relays 有权
    带继电器的无线网络区域

    公开(公告)号:US08774019B2

    公开(公告)日:2014-07-08

    申请号:US12093202

    申请日:2006-11-10

    IPC分类号: H04B7/14

    摘要: Methods and systems are provided for use with wireless networks having once or more cell in which each cell includes a base station (BS), at least one relay station (RS) and at least one mobile station (MS). The at least one relay station can be used as an intermediate station for providing communication between the BS and MS. Methods are provided for an RS to initially access the network, access of the RS by MSs initially accessing the network, methods of allocating OFDM resources for communicating between the BS, RS and/or MS for example dividing transmission resources into uplink and downlink transmissions, and methods of inserting pilot symbols into transmission resources used by the RS. In some embodiments on the invention, the methods are consistent and/or can be used in conjunction with existing standards such as 802.16e.

    摘要翻译: 方法和系统被提供用于具有一个或多个小区的无线网络,其中每个小区包括基站(BS),至少一个中继站(RS)和至少一个移动台(MS)。 所述至少一个中继站可以用作在BS和MS之间提供通信的中间站。 提供了用于RS初始接入网络的方法,初始访问网络的MS接入RS的方法,用于分配用于BS,RS和/或MS之间通信的OFDM资源的方法,例如将传输资源划分为上行链路和下行链路传输, 以及将导频符号插入到由RS使用的传输资源中的方法。 在本发明的一些实施例中,所述方法是一致的和/或可以与诸如802.16e的现有标准结合使用。

    ADAPTIVE TWO-DIMENSIONAL CHANNEL INTERPOLATION
    36.
    发明申请
    ADAPTIVE TWO-DIMENSIONAL CHANNEL INTERPOLATION 有权
    自适应二维通道插值

    公开(公告)号:US20090213948A1

    公开(公告)日:2009-08-27

    申请号:US12064566

    申请日:2006-08-22

    IPC分类号: H04J11/00 H04L27/00 H04L27/28

    摘要: A method and apparatus for improving channel estimation within an OFDM communication system. Channel estimation in OFDM is usually performed with the aid of pilot symbols. The pilot symbols are typically spaced in time and frequency. The set of frequencies and times at which pilot symbols are inserted is referred to as a pilot pattern. In some cases, the pilot pattern is a diagonal-shaped lattice, either regular or irregular. The method first interpolates in the direction of larger coherence (time or frequency). Using these measurements, the density of pilot symbols in the direction of faster change will be increased thereby improving channel estimation without increasing overhead. As such, the results of the first interpolating step can then be used to assist the interpolation in the dimension of smaller coherence (time or frequency).

    摘要翻译: 一种用于改善OFDM通信系统内的信道估计的方法和装置。 OFDM中的信道估计通常借助于导频符号来执行。 导频符号通常在时间和频率上间隔开。 将导频符号插入的频率和时间的集合称为导频模式。 在一些情况下,导频图案是对角线形格子,规则的或不规则的。 该方法首先在较大相干性(时间或频率)的方向内插。 使用这些测量,导频符号在更快变化方向上的密度将增加,从而改善信道估计而不增加开销。 因此,第一内插步骤的结果然后可以用于辅助尺寸较小的相干性(时间或频率)的内插。

    Soft handoff in Ofdma system
    37.
    发明申请
    Soft handoff in Ofdma system 有权
    Ofdma系统中的软切换

    公开(公告)号:US20090129334A1

    公开(公告)日:2009-05-21

    申请号:US11630473

    申请日:2005-06-22

    IPC分类号: H04W36/00

    摘要: The soft handoff in an OFDMA system. 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 have subcarriers with a subchannel definition, for example, an identical permutation.

    摘要翻译: 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,例如相同的置换。

    Method and system for combining OFDM and transformed OFDM
    40.
    发明授权
    Method and system for combining OFDM and transformed OFDM 有权
    用于组合OFDM和变换OFDM的方法和系统

    公开(公告)号:US08724445B2

    公开(公告)日:2014-05-13

    申请号:US13047291

    申请日:2011-03-14

    IPC分类号: H04J9/00

    摘要: Methods and systems are provided that enable an OFDM transmitter to be used for transmitting conventional OFDM or a form of transformed OFDM. A technique is provided for transforming a coded and modulated sequence of samples prior to an IFFT that enables the transformed sequence of samples to be transmitted using conventional OFDM or transformed OFDM. The selection of a transform function for transforming the coded and modulated sequence of samples may be based on optimizing the transform function for particular operating conditions between the transmitter and receiver. In some embodiments of the invention OFDM and time transformed OFDM are multiplexed in time and/or frequency in a transmission frame. In some embodiments of the invention a pilot pattern is provided in which the pilot are sent using OFDM and data is sent using OFDM and/or transformed OFDM.

    摘要翻译: 提供了使OFDM发射机能够用于传输常规OFDM或变换OFDM形式的方法和系统。 提供了一种用于在IFFT之前变换样本的编码和调制序列的技术,其使得能够使用常规OFDM或变换OFDM来发送变换的样本序列。 用于变换样本的编码和调制序列的变换函数的选择可以基于优化发射机和接收机之间的特定操作条件的变换函数。 在本发明的一些实施例中,OFDM和时变OFDM在传输帧中以时间和/或频率被复用。 在本发明的一些实施例中,提供了导频模式,其中使用OFDM发送导频,并且使用OFDM和/或经变换的OFDM发送数据。