公开(公告)号：US20040223540A1

公开(公告)日：2004-11-11

申请号：US10434252

申请日：2003-05-08

Applicant: RF MICRO DEVICES, INC.

Inventor： Peijun Shan

IPC: H04B001/707

CPC classification number: H04B1/70757 ,  H04B1/7115 ,  H04L25/0212

Abstract: The present invention provides a method and apparatus for estimating a multipath channel with sub-chip resolution. In general, secondary signals are characterized based on correlating a received signal including multipath signals, which include a main and the secondary signals, with a pseudo-random noise code. An inverse filter operates to increase a temporal resolution of results of the correlation of the received signal and the pseudo-random noise code, thereby allowing secondary multipath signals occurring within the same chip interval as another multipath signal to be detected and estimated correctly.

Abstract translation: 本发明提供一种用于估计具有子芯片分辨率的多径信道的方法和装置。 通常，二次信号的特征在于，将包括主信号和次信号的多径信号的接收信号与伪随机噪声码相关。 逆滤波器用于增加接收信号和伪随机噪声码的相关结果的时间分辨率，从而允许在与另一个多径信号相同的码片间隔内发生的次多径信号被正确检测和估计。

公开(公告)号：US20040196933A1

公开(公告)日：2004-10-07

申请号：US10831026

申请日：2004-04-23

Applicant: RF MICRO DEVICES, INC.

Inventor： Peijun Shan ,  Eric J. King

IPC: H04L001/00

CPC classification number: H04B1/7107 ,  H04B1/7113 ,  H04B1/7115 ,  H04B1/7117 ,  H04B2201/70707

Abstract: An equalizer operates on chip or sub-chip resolution input samples of a received spread-spectrum multipath signal to remove interference from one or more secondary propagation path signals within the multipath signal. The equalizer may be configured for cancellation of secondary signals arriving before and after a main propagation path signal. The length of sample delay buffers and the input sample rate determine the maximum secondary signal delay accommodated by the equalizer. The equalizer makes a hard-decision about the phase value of each input sample and buffers these hard-decision values for use in secondary signal cancellation. The hard-decision values are used to rotate the phase of corresponding path coefficients. These adjusted values are fed back for subtraction from input samples for post-cursor cancellation, and fed forward for subtraction from delayed input samples for pre-cursor cancellation.

Abstract translation: 均衡器对接收的扩频多径信号的芯片或子芯片分辨率输入样本进行操作，以去除多径信号内的一个或多个次传播路径信号的干扰。 均衡器可以被配置为消除在主传播路径信号之前和之后到达的二次信号。 采样延迟缓冲器的长度和输入采样速率决定均衡器容纳的最大次级信号延迟。 均衡器对每个输入采样的相位值作出硬判决，并缓冲这些硬判决值用于二次信号消除。 硬判决值用于旋转相应路径系数的相位。 这些调整后的值被反馈，用于从输入样本中进行减号以进行后置光标取消，并将其从延迟输入样本中进行前馈以进行前置取消。