公开(公告)号：US5946344A

公开(公告)日：1999-08-31

申请号：US826777

申请日：1997-04-07

申请人： Bruce G. Warren ,  Alan F. Jovanovich ,  John W. Mensonides ,  Duane G. Charron

发明人： Bruce G. Warren ,  Alan F. Jovanovich ,  John W. Mensonides ,  Duane G. Charron

IPC分类号： H03H17/02 ,  H04B1/7093 ,  H04B15/00

CPC分类号： H04B1/7093

摘要： A spread spectrum communication system is provided in which a receiver is adapted to despread multi-bit digital signals transmitted with a fixed chipping rate using two or more different spreading code lengths. As a result, a longer spreading code could be utilized to transmit at a lower data rate for conditions in which jamming resistance is more critical, such as over longer distances, and a shorter spreading code could be utilized to transmit at a higher data rate for conditions in which jamming resistance is less critical, such as over shorter distances. The receiver further comprises a digital matched filter adapted to correlate to the two different spreading codes. The digital matched filter comprises a digital delay line having a plurality of successive delay stages that propagate the received digital signal therethrough at a fixed rate corresponding to the chipping rate of the digital signal. A first correlator compares the digital signal to a first spreading code having a length M, and a second correlator compares the digital signal to a second spreading code having a length N, in which N is less than M. A multiplexer is adapted to select an output from one of the two correlators.

摘要翻译： 提供了一种扩展频谱通信系统，其中接收机适于使用两个或多个不同的扩展码长度对以固定码片速率发射的多位数字信号进行解扩。 结果，可以利用较长的扩展码来以较低的数据速率发送干扰电阻更为关键的条件，例如较长的距离，并且较短的扩展码可以用于以更高的数据速率传输，以便 干扰电阻不太重要的条件，例如越来越短的距离。 接收机还包括适于与两个不同扩展码相关联的数字匹配滤波器。 数字匹配滤波器包括具有多个连续延迟级的数字延迟线，其以对应于数字信号的切片速率的固定速率传播所接收的数字信号。 第一相关器将数字信号与具有长度M的第一扩展码进行比较，第二相关器将数字信号与长度为N的第二扩展码进行比较，其中N小于M。多路复用器适于选择 从两个相关器之一输出。

公开(公告)号：US5940509A

公开(公告)日：1999-08-17

申请号：US972905

申请日：1997-11-18

申请人： Alan F. Jovanovich ,  Bruce G. Warren ,  Duane G. Charron ,  Steven B. Duke

发明人： Alan F. Jovanovich ,  Bruce G. Warren ,  Duane G. Charron ,  Steven B. Duke

IPC分类号： H04K3/00 ,  H04L9/32

CPC分类号： H04K3/20 ,  H04L9/3226 ,  H04L2209/80

摘要： A secure communication system is provided for transmitting a country specific frequency allocation in encrypted form between a host processor and a remote device. The secure communication system comprises a host processor and a remote device capable of communicating with the host processor over a communication link. The host processor has a plurality of stored data sets and a predefined encryption algorithm. Each one of the stored data sets comprises a country specific frequency allocation. The remote device has a unique identifier code and also has the predefined encryption algorithm. Responsive to the unique identifier code, the host processor provides a selected one of the plurality of data sets in encrypted form by utilizing the predefined encryption algorithm. The unique identifier code provides an encryption key for the predefined encryption algorithm. The remote device then decrypts the encrypted data set using the predefined encryption algorithm with the identifier code as a decryption key.

摘要翻译： 提供了一种安全通信系统，用于在主处理器和远程设备之间以加密形式发送国家特定频率分配。 安全通信系统包括主处理器和能够通过通信链路与主机处理器进行通信的远程设备。 主处理器具有多个存储的数据集和预定义的加密算法。 所存储的数据集中的每一个包括国家特定的频率分配。 远程设备具有唯一的标识符代码，并且还具有预定义的加密算法。 响应于唯一标识符代码，主机处理器通过利用预定义的加密算法提供加密形式的多个数据集中的所选择的一个。 唯一标识符代码为预定义的加密算法提供加密密钥。 然后，远程设备使用具有标识码作为解密密钥的预定义加密算法对加密数据集进行解密。

公开(公告)号：US5703950A

公开(公告)日：1997-12-30

申请号：US497698

申请日：1995-06-30

申请人： Alan F. Jovanovich ,  Bruce G. Warren ,  Duane G. Charron ,  Steven B. Duke

发明人： Alan F. Jovanovich ,  Bruce G. Warren ,  Duane G. Charron ,  Steven B. Duke

IPC分类号： H04K3/00 ,  H04L9/32

CPC分类号： H04K3/20 ,  H04L9/3226 ,  H04L2209/80

摘要： A secure communication system is provided for transmitting a country specific frequency allocation in encrypted form between a host processor and a remote device. The secure communication system comprises a host processor and a remote device capable of communicating with the host processor over a communication link. The host processor has a plurality of stored data sets and a predefined encryption algorithm. Each one of the stored data sets comprises a country specific frequency allocation. The remote device has a unique identifier code and also has the predefined encryption algorithm. Responsive to the unique identifier code, the host processor provides a selected one of the plurality of data sets in encrypted form by utilizing the predefined encryption algorithm. The unique identifier code provides an encryption key for the predefined encryption algorithm. The remote device then decrypts the encrypted data set using the predefined encryption algorithm with the identifier code as a decryption key.

摘要翻译： 提供了一种安全通信系统，用于在主处理器和远程设备之间以加密形式发送国家特定频率分配。 安全通信系统包括主处理器和能够通过通信链路与主机处理器进行通信的远程设备。 主处理器具有多个存储的数据集和预定义的加密算法。 所存储的数据集中的每一个包括国家特定的频率分配。 远程设备具有唯一的标识符代码，并且还具有预定义的加密算法。 响应于唯一标识符代码，主机处理器通过利用预定义的加密算法提供加密形式的多个数据集中的所选择的一个。 唯一标识符代码为预定义的加密算法提供加密密钥。 然后，远程设备使用具有标识码作为解密密钥的预定义加密算法对加密数据集进行解密。