METHOD AND APPARATUS FOR ESTIMATING SIGNAL TO INTERFERENCE PLUS NOISE RATIO FOR A RANDOM ACCESS CHANNEL OF A WIRELESS NETWORK

摘要

In described examples, a wireless device (101) includes a preamble detector configured to identify preambles transmitted via a random access channel of a wireless network (100). The preamble detector includes a noise floor estimator. The noise floor estimator is configured to estimate, for a given preamble root sequence identified by the preamble detector, a noise floor value as mean energy of received signal samples, excluding detected preamble samples on the given preamble root sequence, below a noise floor threshold assigned to the given preamble root sequence. The noise floor estimator is configured to compute the noise floor threshold as a product of: average energy of the received signal samples less total signal energy contained in each cyclic prefix window in which a preamble is detected using the given preamble root sequence; and a predetermined normalized relative noise floor threshold based on a target false preamble detection rate.