Methods and systems for transmission of orthogonal frequency division multiplexed symbols
    41.
    发明申请
    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:US20090028258A1

    公开(公告)日:2009-01-29

    申请号:US11887115

    申请日:2006-03-30

    IPC分类号: H04L27/28

    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。

    Method and System For Combining Ofdm and Transformed Ofdm
    42.
    发明申请
    Method and System For Combining Ofdm and Transformed Ofdm 有权
    结合Ofdm和变换的方法和系统

    公开(公告)号:US20080186843A1

    公开(公告)日:2008-08-07

    申请号:US11909567

    申请日:2006-03-30

    IPC分类号: H04J11/00 H04L27/26 H04J15/00

    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。

    Combined space-time decoding
    43.
    发明授权
    Combined space-time decoding 有权
    组合时空解码

    公开(公告)号:US07394860B2

    公开(公告)日:2008-07-01

    申请号:US10263268

    申请日:2002-10-02

    IPC分类号: H04B7/02 H04L1/02

    CPC分类号: H04L1/0618

    摘要: The present invention relates to decoding space time coded (STC) signals transmitted from a number of transmit antennas. First, a separate detection technique is used to determine initial decoding solutions corresponding to the symbols transmitted from each of a number of transmit antennas at a given time. For each initial solution, a limited area about the initial solution is defined. Each of the limited areas will correspond to regions including constellation points proximate the initial solution. The initial solutions are used to define a limited, multi-dimensional space. Accordingly, the initial solutions are used to reduce the search complexity associated with joint decoding by defining a limited space about the initial solutions. Finally, a joint decoding technique is implemented within the limited space to find a final solution.

    摘要翻译: 本发明涉及解码从多个发射天线发射的空时编码(STC)信号。 首先,使用单独的检测技术来确定在给定时间从与多个发射天线中的每一个发送的符号相对应的初始解码解。 对于每个初始解决方案,定义关于初始解决方案的有限区域。 每个有限区域将对应于包括邻近初始解决方案的星座点的区域。 初始解决方案用于定义有限的多维空间。 因此,初始解决方案用于通过定义关于初始解决方案的有限空间来减少与联合解码相关联的搜索复杂度。 最后,在有限的空间内实现联合解码技术,找到最终解决方案。

    Communication Resource Allocation Systems and Methods
    44.
    发明申请
    Communication Resource Allocation Systems and Methods 有权
    通信资源分配系统与方法

    公开(公告)号:US20070286066A1

    公开(公告)日:2007-12-13

    申请号:US11665310

    申请日:2005-10-17

    IPC分类号: H04J11/00

    摘要: A channel descriptor management message is transmitted on a broadcast connection to a mobile terminal. The channel descriptor management message provides a format for a frame. The frame includes a resource space. The channel descriptor management message defines a plurality of channels within the resource space and allocates at least one of the channels to a plurality of users. Subsequent resource allocation messages may refer to a location within a channel rather than a location within the entire resource space.

    摘要翻译: 信道描述符管理消息在广播连接上被发送到移动终端。 信道描述符管理消息提供帧的格式。 该帧包括资源空间。 信道描述符管理消息定义资源空间内的多个信道,并且将至少一个信道分配给多个用户。 随后的资源分配消息可以指代信道内的位置,而不是整个资源空间内的位置。

    Space-time transmit diversity systems and methods for ofdm applications
    47.
    发明授权
    Space-time transmit diversity systems and methods for ofdm applications 有权
    时空发射分集系统和方法应用于ddm

    公开(公告)号:US09450664B2

    公开(公告)日:2016-09-20

    申请号:US11547073

    申请日:2005-04-04

    摘要: Embodiments of the invention provide orthogonal Frequency Division Multiplexing-Space-time Block Codes (OFDMSTBC) mappings for code rate 1, 2 and 4 codes for 4 Transmit Antennas. To overcome the innate weakness of known codes, a new class of STBC codes is provided which is particularly suited for OFDM applications, although other applications are also contemplated. Codes for STBC mappings in the time direction, the frequency direction and a combined time frequency mapping for multiple antennas are provided. In OFDM applications, these codes exploit the properties of OFDM and FEC codes to substantially maintain the advantages of Alamouti codes. Furthermore, while the detailed examples given herein focus on four antenna applications, they can be easily extended to systems with more than four antennas.

    摘要翻译: 本发明的实施例为4个发射天线的码率1,2和4码提供正交频分复用 - 空时块码(OFDMSTBC)映射。 为了克服已知代码的固有缺点,提供了一类新的STBC代码,其特别适用于OFDM应用,尽管也考虑了其他应用。 提供了在时间方向上的STBC映射代码,频率方向和多个天线的组合时间频率映射。 在OFDM应用中,这些代码利用OFDM和FEC码的性质来基本上保持Alamouti码的优点。 此外,虽然本文给出的详细示例集中在四个天线应用,但是它们可以容易地扩展到具有多于四个天线的系统。