Adaptive two-dimensional channel interpolation
    12.
    发明授权
    Adaptive two-dimensional channel interpolation 有权
    自适应二维信道插值

    公开(公告)号:US08331465B2

    公开(公告)日:2012-12-11

    申请号:US12064566

    申请日:2006-08-22

    IPC分类号: H04K1/10

    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。

    ADAPTIVE TWO-DIMENSIONAL CHANNEL INTERPOLATION
    17.
    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。

    Method and system for combining OFDM and transformed OFDM
    19.
    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。

    METHOD AND SYSTEM USING RELAYS WITH AGGREGATED SPECTRUM
    20.
    发明申请
    METHOD AND SYSTEM USING RELAYS WITH AGGREGATED SPECTRUM 有权
    使用集成光谱的继电器的方法和系统

    公开(公告)号:US20110158156A1

    公开(公告)日:2011-06-30

    申请号:US12996189

    申请日:2009-06-12

    IPC分类号: H04W72/04 H04W88/04

    摘要: International Mobile Telecommunications (IMT) Advanced technology, also known as 4th Generation (4G) targets to support up to 100 MHz BW. LTE currently supports single carrier bandwidths of up to 20 MHz. The present application describes a multi-carrier approach in which some embodiments of the invention provide a simple solution of aggregating multiple single carrier bandwidths to obtain a wider bandwidth (>20 MHz). Such an approach may extend Long Term Evolution (LTE) bandwidth to greater than that provided by a single carrier, yet maintain full backward compatibility with technologies that predate 4G technology and utilize smaller, single carrier bandwidths. More generally, embodiments of the invention can apply to other communication standards than only LTE.

    摘要翻译: 国际移动电信(IMT)先进技术,也被称为第四代(4G)目标,以支持高达100 MHz的BW。 LTE目前支持高达20 MHz的单载波带宽。 本申请描述了多载波方法,其中本发明的一些实施例提供聚合多个单载波带宽以获得更宽带宽(> 20MHz)的简单解决方案。 这种方法可以将长期演进(LTE)带宽扩展到大于由单个载波提供的带宽,但仍然保持与早于4G技术并利用更小的单载波带宽的技术的完全向后兼容性。 更一般地,本发明的实施例可以应用于仅比LTE的其他通信标准。