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1. 发明授权

US08553749B2 Signal encoding for frequency division multiplexing on transmission lines 失效
标题翻译：用于传输线上频分复用的信号编码
公开(公告)号：US08553749B2
公开(公告)日：2013-10-08
申请号：US12666733
申请日：2008-02-21
申请人： Richard H Carter , Mark Hathaway
发明人： Richard H Carter , Mark Hathaway
IPC分类号： H04B3/32
CPC分类号： H04L5/0044 , H04L27/2626 , H04L27/2647
摘要： A method of transmitting on a transmission line a set of carrier signals of which at least one component represents a respective data value and the carrier signals are of different frequencies ranging from a lowest frequency to a highest frequency, in which the respective component of each carrier above the lowest frequency is adjusted on transmission in accordance with a selected relationship between that respective component and the corresponding component of the next lower frequency so as to compensate for the frequency-dependent effect of the transmission line on those components. The components may be amplitudes. The relationship may be a ratio of the respective and corresponding components. Alternatively each respective component may be adjusted in accordance with a scaling factor dependent on the previous data value presented by the corresponding component of next lower carrier frequency, the scaling factor being a ratio between a predetermined value and the said corresponding component, the predetermined value depending on the said previous data value. The components may be phases and the phase of each carrier after the first may be set from the phase of the previous lower frequency carrier augmented by the ratio of the data value in bits and the number of bits that can be carried by the respective component.
摘要翻译：一种在传输线上传输一组载波信号的方法，其中至少一个分量表示相应数据值，载波信号具有从最低频率到最高频率的不同频率，其中每个载波的相应分量根据所述相应部件和下一个较低频率的相应部件之间的选择关系，在传输时调整最低频率以便补偿传输线对这些部件的频率依赖性影响。组件可以是振幅。该关系可以是相应和相应组件的比率。或者，可以根据取决于由下一个较低载波频率的对应分量呈现的先前数据值的缩放因子来调整每个相应分量，缩放因子是预定值和所述对应分量之间的比率，预定值依赖关于上述数据值。这些分量可以是相位，并且可以从先前的较低频率载波的相位增加第一数据后的每个载波的相位，由比特中的数据值和可由各个分量携带的比特数的比率来设置。

2. 发明授权

US08274920B2 Token bus communication system 有权
标题翻译：令牌总线通信系统
公开(公告)号：US08274920B2
公开(公告)日：2012-09-25
申请号：US12593817
申请日：2008-02-08
申请人： Richard H Carter
发明人： Richard H Carter
IPC分类号： H04L12/28
CPC分类号： H04L12/417 , H04L12/403 , H04L12/433 , H04L29/12009 , H04L61/00
摘要： In a token bus system a node with the token can transmit on the bus a packet that contains two destination addresses. One address specifies the node that should receive the data component (payload) of the transmitted packet. The other address specifies the node that should receive the token. The network protocol specifies that a node with the token must immediately transmit a packet containing just the token or a packet with token and data if it has data to send. When no data is being passed from one node to another on the network, the token may be passed from one node to the next in order. Each node will pass the token to the next highest node number. If a node has the token has some data for sending it transmits a packet with the token for the next node and data for any of the nodes. The bus system requires every node to receive all packets and process them to determine whether the token or the data (or both) is destined for that node.
摘要翻译：在令牌总线系统中，具有令牌的节点可以在总线上传送包含两个目的地址的数据包。一个地址指定应该接收所发送的数据包的数据组件（有效载荷）的节点。另一个地址指定应该接收令牌的节点。网络协议指定具有令牌的节点必须立即发送包含令牌的数据包或具有令牌和数据的数据包，如果它具有要发送的数据。当网络上没有数据从一个节点传递到另一个节点时，令牌可以按顺序从一个节点传递到下一个节点。每个节点将令牌传递到下一个最高节点号。如果节点具有令牌具有用于发送的一些数据，则发送具有用于下一个节点的令牌的分组以及用于任何节点的数据。总线系统要求每个节点接收所有数据包，并处理它们以确定令牌或数据（或两者）是否发往该节点。

3. 发明授权

US08532165B2 Indicating and detecting the start of signal transmission employing frequency division multiplexing 有权
标题翻译：指示和检测采用频分复用的信号传输开始
公开(公告)号：US08532165B2
公开(公告)日：2013-09-10
申请号：US12595913
申请日：2008-02-12
申请人： Richard H Carter , Mark Hathaway
发明人： Richard H Carter , Mark Hathaway
IPC分类号： H04B1/38
CPC分类号： H04L27/2656 , H03G3/3078 , H04L25/03834 , H04L27/2675
摘要： A modem for use with a subsea transmission line comprises a digital signal processor responsive to a succession of segments of a data signal to produce a respective set of orthogonal frequency division multiplexed signals and to transmit those signals as a burst on the transmission line, and to prepend the burst with a start signal comprising a cyclically time-varying signal envelope-modulated with a Gaussian waveform. The modem is also arranged to convert signals received from the transmission line into a succession of digital samples and to process those samples to obtain an indication of the peak of the Gaussian waveform whereby to provide a datum for decoding a received burst of OFDM signals.
摘要翻译：用于海底传输线的调制解调器包括数字信号处理器，其响应于数据信号的一系列段以产生相应的正交频分多路复用信号集，并将这些信号作为突发传送到传输线上，并且用包括用高斯波形包络调制的周期性时变信号的起始信号预加入脉冲串。调制解调器还被布置成将从传输线接收的信号转换为一系列数字样本，并且处理这些样本以获得高斯波形的峰值的指示，从而提供用于对接收到的OFDM信号的突发进行解码的数据。

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