公开(公告)号：US07221701B2

公开(公告)日：2007-05-22

申请号：US10265525

申请日：2002-10-07

申请人： Orhan Arikan ,  Ahmet Kemal Ozdemir

发明人： Orhan Arikan ,  Ahmet Kemal Ozdemir

IPC分类号： H04B1/69 ,  H04B1/707 ,  H04B1/713

CPC分类号： H04B1/7115 ,  H04B1/7117 ,  H04B1/712 ,  H04L25/0202 ,  H04L25/0224

摘要： A system and method for spread spectrum communication primarily for use in mobile CDMA communication systems. The system receiver has simplified architecture, comprising a channel compensator and correlation detector. The channel compensator has a channel estimator and signal constructor. In a preferred embodiment, the channel estimator periodically computes the cross-ambiguity function of the transmitted and received pilot signals of the CDMA system using computationally efficient processing algorithms. The signal constructor uses the estimated multipath parameters to construct a new signal on which effects of the multipath channel is considerably mitigated.

摘要翻译： 主要用于移动CDMA通信系统的扩频通信系统和方法。 系统接收机具有简化的架构，包括信道补偿器和相关检测器。 信道补偿器具有信道估计器和信号构造器。 在优选实施例中，信道估计器使用计算有效的处理算法周期性地计算CDMA系统的发送和接收导频信号的交叉模糊度函数。 信号构造器使用估计的多路径参数来构建一个新的信号，在该信号上，多路径信道的效果被大大减轻。

公开(公告)号：US20070103362A1

公开(公告)日：2007-05-10

申请号：US11645318

申请日：2006-12-21

申请人： Orhan Arikan ,  Ahmet Ozdemir

发明人： Orhan Arikan ,  Ahmet Ozdemir

IPC分类号： G01S13/00

CPC分类号： G01S7/295 ,  G01S13/524

摘要： System and method for detection and tracking of targets, which in a preferred embodiment is based on the use of fractional Fourier transformation of time-domain signals to compute projections of the auto and cross ambiguity functions along arbitrary line segments. The efficient computational algorithms of the preferred embodiment are used to detect the position and estimate the velocity of signals, such as those encountered by active or passive sensor systems. Various applications of the proposed algorithm in the analysis of time-frequency domain signals are also disclosed.

公开(公告)号：US20040085241A1

公开(公告)日：2004-05-06

申请号：US10691245

申请日：2003-10-21

申请人： Altratek, Inc.

发明人： Orhan Arikan ,  Ahmet Kemal Ozdemir

IPC分类号： G01S013/00 ,  G01S007/00

CPC分类号： G01S7/295 ,  G01S13/524

摘要： System and method for detection and tracking of targets, which in a preferred embodiment is based on the use of fractional Fourier transformation of time-domain signals to compute projections of the auto and cross ambiguity functions along arbitrary line segments. The efficient computational algorithms of the preferred embodiment are used to detect the position and estimate the velocity of signals, such as those encountered by active or passive sensor systems. Various applications of the proposed algorithm in the analysis of time-frequency domain signals are also disclosed.

摘要翻译： 目的的检测和跟踪的系统和方法，其在优选实施例中是基于使用时域信号的分数阶傅里叶变换来计算沿着任意线段的自动和交叉模糊函数的投影。 优选实施例的有效计算算法用于检测位置并估计诸如主动或被动传感器系统遇到的信号的速度。 还公开了所提出的算法在时域信号分析中的各种应用。