Patent ID: 8660013
Filing Date: 2014-02-25
Classification: H04L,H04W

Abstract:
1. A method comprising: monitoring a shared medium at a second station, before receiving a waveform from a first station, to detect a start of a first symbol of the waveform at one of multiple time slot boundaries, the monitoring including, after each of multiple time slot boundaries, periodically sampling a series of values received over the shared medium starting at a beginning of a most recent time slot boundary and processing the sampled values to generate a metric value that indicates whether the start of the first symbol of the waveform has been detected; receiving the waveform from the first station over the shared medium at a time that is based on a shared time reference shared by the first station and the second station, the waveform including at least the first symbol, having a predetermined symbol length, comprising a first set of frequency components at predetermined carrier frequencies modulated with preamble information and a second set of frequency components at predetermined carrier frequencies modulated with frame control information, with the carrier frequencies of the first and second sets of frequency components being integral multiples of a frequency interval determined by an inverse of the symbol length; and in response to detecting the start of the first symbol of the waveform, demodulating, at the second station, the first symbol of the waveform from values sampled based on the shared time reference.