公开(公告)号：US20040240597A1

公开(公告)日：2004-12-02

申请号：US10814824

申请日：2004-03-31

Applicant: STMicroelectronics N.V.

Inventor： Chiara Cattaneo ,  Nils Rinaldi ,  Matteo Frigerio ,  Regis Cattenoz

IPC: H04L027/06

CPC classification number: H04B1/7183 ,  H04B2001/6908

Abstract: An incident signal contains a preamble including a training sequence having a series of pulses whose polarity and time shifts are defined by respective polarity code and time-hopping code. A method includes a digital cross-correlation of the received signal with the training sequence. The cross-correlation algebraically sums in accordance with the polarity code windows of the received signal. The starting points of the windows are determined by the time-hopping code. The cross-correlation further includes detecting the end point of the preamble from the result of the digital cross-correlation. When the size of the receiving buffer, i.e., the size of the window is smaller than the number N of samples of each replica of the training sequence, it is particularly advantageous that the digital cross-correlation be performed iteratively in a block-by-block fashion. The computation of each block is split into M slices which are computed by algebraically summing windows N/M samples long.

Abstract translation: 入射信号包含前导码，其包括具有一系列脉冲的训练序列，其极性和时间偏移由相应的极性码和跳时码定义。 一种方法包括接收信号与训练序列的数字互相关。 互相关代数根据接收信号的极性码窗口相加。 窗口的起点由跳时码决定。 互相关还包括从数字互相关的结果检测前同步码的终点。 当接收缓冲器的大小（即，窗口的大小）小于训练序列的每个副本的样本数N时，特别有利的是，数字互相关是逐个逐行执行的， 块时尚。 每个块的计算被分成M个片段，它们通过对N / M个样本长的代数求和来计算。