Detecting a periodic timing reference in a received signal

摘要

An apparatus for detecting a periodic timing reference in a received signal comprises a correlator and an integrator. The correlator is configured to correlate the received signal with a template to produce a correlated signal indicating the presence of the periodic timing reference in the received signal. The integrator is configured to produce an accumulated signal by overlaying one or more delayed versions of the accumulated signal onto the correlated signal, and is further configured to delay the accumulated signals by integer multiples L of a period of the periodic timing reference, the integer multiples L being at least two.

主权项

1. An apparatus for detecting a timing reference that occurs periodically in a received signal every P seconds, the apparatus comprising:
a correlator configured to correlate the received signal with a template to produce a correlated signal indicating the presence of the timing reference in the received signal; an integrator configured to produce an accumulated signal by overlaying one or more delayed versions of the accumulated signal onto the correlated signal, wherein the integrator is configured to delay the accumulated signals by integer multiples L of P, the integer multiples L being at least two; and a timing detector configured to receive the accumulated signal from the integrator and to indicate timing acquisition or no timing acquisition based on determining a corroboration between:
a first plurality of peak values of the accumulated signal that are separated in time by L times P, anda second plurality of peak values of the accumulated signals that are separated in time by integer multiples K of P, where K is an integer different than L, and K is not an integer multiple of L.