公开(公告)号：US20030053625A1

公开(公告)日：2003-03-20

申请号：US10230652

申请日：2002-08-29

Applicant: THE TITAN CORPORATION

Inventor： Theodore Bially ,  Harry B. Lee

IPC: H04L009/00

CPC classification number: H04L9/0631 ,  H04L9/0662 ,  H04L9/083 ,  H04L2209/125 ,  H04L2209/24

Abstract: In an encryption system, a serial data stream is demultiplexed into a plurality N of encryptor input data streams to form a sequence of encryptor input data slices applied to an encryptor having a cascade of stages. Each stage includes a mapping function and a delay function, the mapping function performing a stage-specific direct mapping of data slice values to corresponding generally different data slice values, and the delay function applying stage-specific and generally different delays to individual symbols of data slices. Encrypted data slices generated by the last stage of the encryptor are transmitted through a transmission channel and received at a decryptor having a cascade of stages. Each decryptor stage includes an equalizing delay function and an inverse mapping function to generate output data slices from input data slices. Each output data slice of the last decryptor stage comprises respective values at a given time of a set of N decryptor output data streams, which are multiplexed together to recover the serial data stream.

Abstract translation: 在加密系统中，将串行数据流解复用为多个N个加密器输入数据流，以形成应用于具有级联级别的加密器的加密器输入数据片段序列。 每个阶段包括映射函数和延迟函数，映射函数执行数据切片值的阶段特定直接映射到相应的大体上不同的数据切片值，以及对各个数据符号应用阶段特定且大体上不同的延迟的延迟函数 切片。 由加密器的最后一级生成的加密数据片段通过传输信道传输，并在具有级联级别的解密器处接收。 每个解码器级包括均衡延迟函数和用于从输入数据片生成输出数据片的逆映射函数。 最后解密器级的每个输出数据片包括在一组N个解密器输出数据流的给定时间处的相应值，它们被多路复用在一起以恢复串行数据流。

公开(公告)号：US20020094022A1

公开(公告)日：2002-07-18

申请号：US09919121

申请日：2001-07-30

Applicant: THE TITAN CORPORATION

Inventor： Theodore Bially ,  Paul F. McKenzie

IPC: H04K001/00

CPC classification number: H04B1/7102 ,  H04B2201/70727

Abstract: In a frequency-domain excision system for a wide band receiver, a window function is applied to blocks of received signal samples and a transform function is applied to the windowed blocks. Each block of frequency-domain coefficients from the transform function is morphologically filtered to generate a threshold function representing an estimate of the spectrum of the desired wide band signal, and a non-linear gain function is applied to the coefficients. The gain function has a fixed-gain region for input values less than a threshold value from the threshold function, an excision region for input values greater than a multiple of the threshold value, and a soft limiting region between the fixed-gain region and the excision region. The inverse transform is performed on the excised blocks of coefficients, and an overlap-eliminating central portion of the inverse of the window function is applied to the resulting blocks of signal samples.

Abstract translation: 在用于宽带接收机的频域切除系统中，将窗函数应用于接收信号样本的块，并将变换函数应用于窗口块。 来自变换函数的每个频域系数块被形态滤波以产生表示所需宽带信号的频谱的估计的阈值函数，并且将非线性增益函数应用于系数。 增益函数具有用于小于阈值函数的阈值的输入值的固定增益区域，用于大于阈值的倍数的输入值的切除区域，以及固定增益区域与固定增益区域之间的软限制区域 切除区。 对所切除的系数块执行逆变换，并且将窗函数的逆的重叠消除中心部分应用于所得到的信号样本块。