A telecommunication system including a receiver to receive a signal including a sequence of Np pulses, each pulse included in a separate time window, and each pulse enclosed within a time chip whose position within the corresponding time window is defined by a chip number that is included in a known signature; and a detector configured to detect Np pulses in each of the separate time windows by using Np detection windows, a location of the detection windows defined by the known signature, the detection windows being shorter than the separate time windows, and longer than the time chip duration of the time chips, to search an expected pulse sequence.