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。