公开(公告)号：US20150139283A1

公开(公告)日：2015-05-21

申请号：US14085443

申请日：2013-11-20

Applicant: Analog Devices Technology

Inventor： Michael Dalton

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

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 comprises demodulating a received radio signal based on a carrier derived from a local timing source to provide a digital signal comprising 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 have a combined width within a threshold value, 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 comprising 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 said measure.

Abstract translation: 用于检测接收到的无线电信号中的前同步码的方法包括基于从本地定时源导出的载波来解调所接收的无线电信号，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在阈值内的组合宽度，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指示为潜在地包括前导码。 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，并且可以根据所述测量来调整本地定时源的频率。