Patent ID: 9749124
Date: 2017-08-29
CPC Classifications: H04L

Claim:
1. A method for detecting a symbol boundary between symbol intervals in a data packet comprising a guard interval preceding a preamble having a predetermined sequence of symbols, the method comprising: receiving a signal representing a data packet, the signal comprising a first signal transmitted from one antenna and one or more other signals transmitted from respective one or more other antennas, said other signals being the same as the first signal and shifted by predetermined amount of time; sampling the received signal at a specified sampling rate to obtain a set of samples; estimating channel impulse responses from the set of samples in dependence on the predetermined sequence of symbols of the preamble; determining an energy value for each of a plurality of first windows of channel impulse responses, each of the first windows corresponding to W number of consecutive samples, W being an integer greater than 1, the energy value for each of the first windows being indicative of the total energy associated with the channel impulse responses of that window; determining which of the first windows has the greatest energy value; identifying the earliest sample n calculating a sample range in dependence on sample n determining an energy value for each of a plurality of second windows of channel impulse responses, each second window corresponding to W determining which second window has the greatest estimated energy value; and identifying the earliest sample of the consecutive W