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    Method for synchronous encryption over a communication medium
    6.
    发明授权
    Method for synchronous encryption over a communication medium 有权
    通信介质同步加密方法

    公开(公告)号：US06944299B1

    公开(公告)日：2005-09-13

    申请号：US09204048

    申请日：1998-12-02

    申请人： Padma P. Mallela ,  Robert Lee Maxwell ,  David J. Nix ,  Gregory J. Veintimilla ,  Adrian M. Yip

    发明人： Padma P. Mallela ,  Robert Lee Maxwell ,  David J. Nix ,  Gregory J. Veintimilla ,  Adrian M. Yip

    IPC分类号： H04L9/00 ,  H04N7/167

    CPC分类号： H04L9/12 ,  H04N21/2347 ,  H04N21/43637

    摘要： An apparatus and method provide for synchronized operation of encryption processes at two remote communication terminals. A first one of the terminals detects information associated with a current time during the establishment of a connection between the two terminals. The current time information is then utilized to create a start encryption time. That start encryption time information is transmitted from the first terminal to the second terminal. Both terminals then monitor the passage of time and begin encryption in a synchronous manner when the current time matches the start encryption time.

    摘要翻译： 一种装置和方法提供两个远程通信终端上的加密过程的同步操作。 在建立两个终端之间的连接时，终端中的第一个检测与当前时间相关联的信息。 然后利用当前时间信息来创建开始加密时间。 该开始加密时间信息从第一终端发送到第二终端。 两个终端随后监视时间的流逝，并在当前时间与开始加密时间匹配时以同步方式开始加密。

    Out of channel cyclic redundancy code method for a discrete multitone spread spectrum communications system
    7.
    发明授权
    Out of channel cyclic redundancy code method for a discrete multitone spread spectrum communications system 失效

    公开(公告)号：US06289037B1

    公开(公告)日：2001-09-11

    申请号：US08803831

    申请日：1997-02-24

    申请人： David Gibbons ,  Robert Lee Maxwell ,  David James Ryan

    发明人： David Gibbons ,  Robert Lee Maxwell ,  David James Ryan

    IPC分类号： H04L2730

    CPC分类号： H04L1/0003 ,  H04B1/69 ,  H04L1/0045 ,  H04L1/0057 ,  H04L1/16

    摘要： A new method makes the most efficient use of the scarce spectral bandwidth in a wireless discrete multitone spread spectrum communications system. Each remote station and each base station in the network prepares an error detection field, such as a cyclic code (CRC), on each block of data to be transmitted over the traffic channels. The sending station prepares an error detection message for transmission over the link control channel of the network. The sending station prepares the error detection message by forming a link control channel vector that will be spread using the discrete multitone spread spectrum (DMT-SS) protocol to distribute the data message over a plurality of discrete tone frequencies, forming a spread signal for the link control channel. A link control channel is associated with communications session using the traffic channels. The instant of transmission of the error detection message is allowed to be different from the instant of transmission of the data message. This permits the error detection messages to be transmitted when capacity is available on the link control channel. The receiving station buffers the error detection messages it receives from the link control channel, so that they are accessible by their block numbers. When the receiving station receives a data message on the traffic channel, it performs a CRC calculation on the data block in the message to obtain a resulting new CRC value. The new CRC value is also buffered at the receiving station with the block number so that it is accessible by its block number. Then, when both the received error message and the new CRC value are both available at the receiving station, they are matched by their common block number. The received CRC value in the error detection message is compared with the new CRC computed from the received data block. If the comparison determines that there is a difference in the values, then an error signal is generated.

    Out of channel cyclic redundancy code method for a discrete multitone spread spectrum communications system
    8.
    发明授权
    Out of channel cyclic redundancy code method for a discrete multitone spread spectrum communications system 失效

    公开(公告)号：US06639935B2

    公开(公告)日：2003-10-28

    申请号：US09902730

    申请日：2001-07-12

    申请人： David Gibbons ,  Robert Lee Maxwell ,  David James Ryan

    发明人： David Gibbons ,  Robert Lee Maxwell ,  David James Ryan

    IPC分类号： H04B169

    CPC分类号： H04L1/0003 ,  H04B1/69 ,  H04L1/0045 ,  H04L1/0057 ,  H04L1/16

    摘要： A new method makes the most efficient use of the scarce spectral bandwidth in a wireless discrete multitone spread spectrum communications system. Each remote station and each base station in the network prepares an error detection field, such as a cyclic redundancy code (CRC), on each block of data to be transmitted over the traffic channels. The sending station prepares an error detection message for transmission over the link control channel of the network. The sending station prepares the error detection message by forming a link control channel vector that will be spread using the discrete multitone spread spectrum (DMT-SS) protocol to distribute the data message over a plurality of discrete tone frequencies, forming a spread signal for the link control channel. A link control channel is associated with communications session using the traffic channels. The instant of transmission of the error detection message is allowed to be different from the instant of transmission of the data message. This permits the error detection messages to be transmitted when capacity is available on the link control channel. The receiving station buffers the error detection messages it receives from the link control channel, so that they are accessible by their block numbers. When the receiving station receives a data message on the traffic channel, it performs a CRC calculation on the data block in the message to obtain a resulting new CRC value. The new CRC value is also buffered at the receiving station with the block number so that it is accessible by its block number. Then, when both the received error message and the new CRC value are both available at the receiving station, they are matched by their common block number. The received CRC value in the error detection message is compared with the new CRC computed from the received data block. If the comparison determines that there is a difference in the values, then an error signal is generated.