公开(公告)号：US09191189B2

公开(公告)日：2015-11-17

申请号：US14085443

申请日：2013-11-20

Applicant: ANALOG DEVICES GLOBAL

Inventor： Michael Dalton

IPC: H04B1/38 ,  H04L7/00 ,  H04L27/00 ,  H04L7/06

CPC classification number: H04L7/0087 ,  H04B1/38 ,  H04L7/042 ,  H04L7/06 ,  H04L27/0014 ,  H04L2027/0036 ,  H04L2027/0095

Abstract: A method for detecting a preamble in a received radio signal includes demodulating the radio signal based on a carrier derived from a local timing source to provide a digital signal including a sequence of bits oscillating at approximately a modulated data rate. A bit width of each successive bit of the digital signal is determined. If a pair of consecutive bit widths has a combined width within a threshold, the bit pair is indicated as potentially belonging to a preamble. If a threshold number of potential preamble bit pairs in a sequence of bit pairs within a given window is detected, the sequence of bit pairs is indicated as potentially belonging to a preamble. A measure of bit widths of at least some bits within a sequence of preamble bit pairs can be provided and a frequency of the local timing source can be adjusted according to the measure.

Abstract translation: 一种在接收的无线电信号中检测前置码的方法包括：基于从本地定时源导出的载波来解调无线电信号，以提供包括以大约调制数据速率振荡的比特序列的数字信号。 确定数字信号的每个连续位的位宽度。 如果一对连续比特宽度具有阈值内的组合宽度，则该比特对被指示为潜在地属于前导码。 如果检测给定窗口内的位对序列中的潜在前导码比特对的阈值数目，则将该比特对的序列表示为可能属于前导码。 可以提供在前导码比特对序列内的至少一些比特的比特宽度的度量，并且可以根据该度量来调整本地定时源的频率。