Patent ID: 8958754
Filing Date: 2015-02-17
Classification: G01S

Abstract:
1. A method for determining a time of arrival of a signal transmitted by a mobile device, the method comprising: receiving a signal from a mobile device as a plurality of data samples, the received signal including a first component corresponding to a known reference signal and a second component corresponding to at least one of an unknown channel impairment and an unknown noise; forming a sequence of blocks based on the received samples, wherein the first component of the received signal corresponding to the reference signal is known to within a constant phase shift over each block; generating a first plurality of function values as a function of time, frequency, and phase, based on the received signal, wherein the function values of the first plurality correspond to a plurality of times, a plurality of frequencies, and a plurality of phase sequences, and the function values of the first plurality are calculated to compensate for frequency and phase discontinuities and drift; determining a time, a frequency, and a phase sequence corresponding to an optimal value of the first plurality of function values; and outputting the determined time as the time of arrival of the received signal.