Generating signals for transmission of information
    61.
    发明授权
    Generating signals for transmission of information 有权
    生成信号传输信息

    公开(公告)号:US07590183B2

    公开(公告)日:2009-09-15

    申请号:US11127401

    申请日:2005-05-12

    IPC分类号: H04K1/00 H04L27/28

    CPC分类号: H04L27/2608 H04L27/2602

    摘要: A method for generating a signal is presented. The method includes selecting a first set of carrier frequencies that are integral multiples of a first frequency interval, and selecting a second set of carrier frequencies that are integral multiples of a second frequency interval. The second frequency interval is an integral multiple of the first frequency interval and the second set is a subset of the first set. The method includes, for each of one or more signal carrier frequencies in the second set, selecting a plurality of associated carrier frequencies in the first set including a peak carrier frequency having substantially the same value as the signal carrier frequency, and modulating waveform frequency components at each of the selected plurality of associated carrier frequencies according to the same data value.

    摘要翻译: 提出了一种产生信号的方法。 该方法包括选择作为第一频率间隔的整数倍的第一组载波频率,以及选择作为第二频率间隔的整数倍的第二组载波频率。 第二频率间隔是第一频率间隔的整数倍,第二组是第一组的子集。 该方法包括对于第二组中的一个或多个信号载波频率中的每一个,选择包括具有与信号载波频率基本相同的值的峰值载波频率的第一组中的多个相关联的载波频率,以及调制波形频率分量 根据相同的数据值在所选择的多个相关联的载波频率中的每一个。

    CLOCK SYNCHRONIZATION OVER A SHARED MEDIUM
    63.
    发明申请
    CLOCK SYNCHRONIZATION OVER A SHARED MEDIUM 有权
    时钟同步在一个共享的媒体

    公开(公告)号:US20090011782A1

    公开(公告)日:2009-01-08

    申请号:US12133233

    申请日:2008-06-04

    IPC分类号: H04B7/01

    摘要: Communicating among stations in a network includes providing repeated beacon transmissions from at least some of the stations including a first station. The first station is assigned to a first level. Any stations that can reliably receive transmissions from the first station are assigned to a second level. Any stations not assigned to any of the preceding levels that can reliably receive transmissions from the preceding level are assigned to each of one or more higher levels. Timing information at each station in a given level is synchronized according to transmissions received from at least one station in the preceding level.

    摘要翻译: 在网络中的站之间进行通信包括提供来自包括第一站在内的至少一些站的重复信标传输。 第一站被分配到第一级。 能够可靠地接收来自第一站的传输的任何站被分配到第二级。 没有分配给可以从前一级别可靠地接收传输的任何前述级别的任何站被分配给一个或多个更高级别的每一个。 在给定级别的每个站处的定时信息根据从前一级中的至少一个站接收的传输来同步。

    Media access control protocol with priority and contention-free intervals
    64.
    发明授权
    Media access control protocol with priority and contention-free intervals 有权
    媒体访问控制协议具有优先级和无争用间隔

    公开(公告)号:US07352770B1

    公开(公告)日:2008-04-01

    申请号:US09632303

    申请日:2000-08-04

    摘要: An access contention scheme having both multi-level priorities and a contention-free access indicator for use by a station in a network of stations. When a contention control indicator is detected for a contention period, a station having a frame to transmit determines from the contention control indicator if it is permitted to contend for access to the transmission medium during the contention period. The station determines if the contention control indicator indicates a contention-free access and, if the contention control information indicates a contention-free access, the station determines if a channel access priority level associated with the frame to be transmitted is higher than a channel access priority level associated with a last transmitted frame. If the channel access priority level associated with the frame to be transmitted is higher, the station detects whether any station in the network of stations intends to contend for access to the medium at a channel access priority level that is higher than the channel access priority level associated with the frame to be transmitted. If so, the station defers contention for access. Each station listens for channel access priority levels of other stations and may signal its own channel access priority level during a priority resolution period preceding the contention period. The channel access priority is signaled as a two bit value and the priority resolution period includes two priority resolution slots corresponding to the two bit value and is used to separate higher channel access priority values from lower channel access priority values.

    摘要翻译: 具有多级优先级和无争用访问指示符的访问争用方案,用于站点网络中的站。 当在争用期间检测到竞争控制指示符时,具有发送帧的站从竞争控制指示符确定在争用期间是否允许竞争访问传输介质。 该站确定竞争控制指示符是否指示无争用接入,并且如果争用控制信息指示无争用接入,则该站确定与要发送的帧相关联的信道接入优先级是否高于信道接入 与最后传输的帧相关联的优先级。 如果与要发送的帧相关联的信道接入优先级较高,则站检测站中网络中的任何站是否意图在信道接入优先级高于信道接入优先级的情况下竞争接入介质 与要发送的帧相关联。 如果是这样,那么这个车站就会争取进场。 每个站监听其他站的信道接入优先级,并且可以在争用周期之前的优先级分辨周期期间发信号通知其自身的信道接入优先级。 信道接入优先级被用信号通知为两比特值,优先级分辨率周期包括与两比特值对应的两个优先级分辨率时隙,并用于将较高信道接入优先级值与较低信道接入优先级值分开。

    Frame control for efficient media access
    66.
    发明授权
    Frame control for efficient media access 有权
    帧控制,用于高效的媒体访问

    公开(公告)号:US06671284B1

    公开(公告)日:2003-12-30

    申请号:US09632596

    申请日:2000-08-04

    IPC分类号: H04J302

    摘要: A robust Media Access Control (MAC) scheme for network stations operating in an OFDM transmissions network. The MAC scheme uses robustly transmitted frame control information to ensure network synchronization (for media access) and convey channel access prioritization for QoS. Frame control information can occur in a frame before and after the frame's payload, or in a response.

    摘要翻译: 用于在OFDM传输网络中操作的网络站的强大的媒体访问控制(MAC)方案。 MAC方案使用强大的传输帧控制信息来确保网络同步(用于媒体接入)并传送QoS的信道接入优先级。 帧控制信息可以在帧的有效载荷之前和之后的帧中或在响应中发生。

    Frame control encoder/decoder for robust OFDM frame transmissions
    67.
    发明授权
    Frame control encoder/decoder for robust OFDM frame transmissions 有权
    用于鲁棒OFDM帧传输的帧控制编码器/解码器

    公开(公告)号:US06289000B1

    公开(公告)日:2001-09-11

    申请号:US09574959

    申请日:2000-05-19

    IPC分类号: H04J1100

    摘要: An encoder/decoder scheme for robust transmission of PHY layer frame control information (to support medium access) in OFDM frames (or packets). The PHY layer frame control information to be modulated onto carriers in OFDM symbols is encoded using a product coding to form a product code block or matrix. The product coding is based on a shortened hamming code codeword set having properties of symmetry. Elements of the product code matrix are interleaved so that the elements are modulated onto the carriers of the symbols in diagonal groupings (across time and frequency) and with some degree of redundancy. The modulated elements are demodulated to produce soft decision values, which are de-interleaved to combine copies of the soft values for elements and re-order the soft values in the order of the elements prior to interleaving. The soft values for each row and each column are provided to a turbo product decoder, which performs a number of iterations of row/column decoding, each iteration applying a weighting to the results to enhance the reliability of the results of each next successive iteration. Upon completion of the final iteration, the decoder applies a hard decision to the soft values to produce a set of hard values for each of the soft values that corresponds to the frame control information. Given the symmetry of the code set, the row/column decoding generates a complete set of correlation values from only a subset of the complete set of correlation values and uses a reduced number of MAP decoding operations to select the best correlation values for each of the soft values.

    摘要翻译: 用于OFDM帧(或分组)中的PHY层帧控制信息(以支持媒体接入)的鲁棒传输的编码器/解码器方案。 要使用产品编码对OFDM符号中要调制到载波上的PHY层帧控制信息进行编码以形成乘积码块或矩阵。 产品编码基于具有对称特性的缩短的汉明码码字集合。 产品代码矩阵的元素被交织,使得元素在对角线分组(跨越时间和频率)并以一定程度的冗余度被调制到符号的载波上。 经调制的元件被解调以产生软判决值,其被解交织以组合元件的软值的副本并且在交织之前按照元素的顺序重新排序软值。 每行和每列的软值被提供给turbo产品解码器,该turbo产品解码器执行行/列解码的多次迭代,每次迭代对结果应用加权以增强每个下一个连续迭代的结果的可靠性。 在完成最终迭代之后,解码器对软值应用硬判决,以产生对应于帧控制信息的每个软值的一组硬值。 给定代码集的对称性,行/列解码从完整的相关值集合的子集中生成完整的一组相关值,并且使用减少数量的MAP解码操作来选择每个的最佳相关值 软值。

    Synchronization of OFDM signals
    68.
    发明授权
    Synchronization of OFDM signals 有权
    OFDM信号同步

    公开(公告)号:US6111919A

    公开(公告)日:2000-08-29

    申请号:US234289

    申请日:1999-01-20

    CPC分类号: H04L27/2662 H04L27/2679

    摘要: A method is described for temporally aligning a received symbol that is transmitted via orthogonal channels, e.g., OFDM channels, with a reference symbol and/or an earlier received symbol. The method includes computing phases of the first symbol for the orthogonal transmission channels and comparing the computed phases of the first symbol with phases of the reference. The phases of the first symbol are successively displaced by a predetermined phase shift which depends on the channel frequency to obtain a correlation result. The temporal alignment is determined by detecting a correlation maximum based on the correlation result and used to synchronize the first symbol with the reference. The reference can also be an earlier received symbol to provide autocorrelation. The received symbols can be processed by applying a window function, e.g. a Hanning, Hamming or Blackman window. Phase correlation provides reliable time synchronization in the presence of jammers emitting narrowband signals in excess of 32 dB above the signal level.

    摘要翻译: 描述了一种用于将经由诸如OFDM信道的正交信道发送的接收符号与参考符号和/或较早接收到的符号进行时间对准的方法。 该方法包括计算用于正交传输信道的第一符号的相位,并将计算出的第一符号的相位与参考的相位进行比较。 第一符号的相位依次取决于通道频率以获得相关结果而相继移位预定的相移。 通过基于相关结果检测相关最大值并用于使第一符号与参考同步来确定时间对准。 该参考也可以是较早接收的符号以提供自相关。 可以通过应用窗口功能来处理所接收的符号,例如, 汉宁,汉明或布莱克曼窗。 相位相位提供可靠的时间同步,存在干扰信号发射超过信号电平32 dB的窄带信号。

    Communication between network nodes
    69.
    发明授权
    Communication between network nodes 有权
    网络节点之间的通信

    公开(公告)号:US09385782B1

    公开(公告)日:2016-07-05

    申请号:US12979780

    申请日:2010-12-28

    IPC分类号: H04L12/66 H04B3/54

    摘要: Network signals are coupled to and from a first communication medium that is coupled to one or more nodes of a first network that exchange signals according to at least one scheduling constraint of the first communication medium. Network signals are coupled to and from a second communication medium that is coupled to one or more nodes of a second network that exchange signals according to a schedule compatible with scheduling information received from the first network. Information conveyed by the coupled network signals is communicated between a first network node and a second network node, according to the schedule compatible with the scheduling information received from the first network.

    摘要翻译: 网络信号被耦合到耦合到第一通信介质,第一通信介质被耦合到根据第一通信介质的至少一个调度约束来交换信号的第一网络的一个或多个节点。 网络信号耦合到第二通信介质,该第二通信介质耦合到第二网络的一个或多个节点,其根据与从第一网络接收的调度信息兼容的调度来交换信号。 根据与从第一网络接收到的调度信息兼容的调度,在第一网络节点和第二网络节点之间传送由耦合网络信号传送的信息。

    Repeating for low-overhead communication in a network
    70.
    发明授权
    Repeating for low-overhead communication in a network 有权
    重复在网络中的低开销通信

    公开(公告)号:US09326316B2

    公开(公告)日:2016-04-26

    申请号:US13085277

    申请日:2011-04-12

    摘要: Communicating between stations over a shared medium comprises: receiving, at a destination station, a first waveform that includes one or more segments of a payload that originated from an origin station with a sequence of multiple segments, the one or more segments included in the first waveform having been transmitted over the shared medium by the origin station and by each of one or more repeater stations, and the first waveform indicating which of the sequence of multiple segments were not correctly decoded by at least one of the repeater stations; generating, based on the first waveform, acknowledgement information that specifies which of the sequence of multiple segments have been correctly decoded by the destination station; and transmitting a second waveform from the destination station over the shared medium, the second waveform including the acknowledgement information.

    摘要翻译: 通过共享介质在站之间进行通信包括:在目的地站处接收第一波形,该第一波形包括源自源站的有效载荷的一个或多个段,其具有多个段的序列,所述一个或多个段包括在第一个 已经由原始站和一个或多个中继站中的每一个通过共享介质发送的波形,以及指示多个段的序列中的哪一个未被至少一个中继站正确解码的第一波形; 基于所述第一波形生成确定所述多个片段的序列中的哪一个已被所述目的地站正确解码的确认信息; 以及通过所述共享介质从所述目的地站发送第二波形,所述第二波形包括所述确认信息。