Patent ID: 9247509
Filing Date: 2016-01-26
CPC Classification: H04B,H04J,H04W

Claim Text:
1. A method comprising: detecting a communication signal from a base station on a shared downlink channel; sampling the communication signal at a sample rate higher than a chip rate of the shared downlink channel to generate a sampled communication signal, wherein the sampled communication signal comprises a frame including a plurality of slots, and chip rate of the of shared downlink channel comprises a number of chip in each of the plurality of slots; splitting the sampled communication signal into a first group of samples and a second group of samples; correlating the first group of samples and second group of samples with a primary synchronization code (PSC) of the communication signal and generating complex values of the first group of samples and the second group of samples, the complex values being complex numbers including a real component and an imaginary component; obtaining an absolute value for the complex values of the first group of samples and the second group of samples, wherein obtaining an absolute value for the complex values of the first group of samples and the second group of samples includes approximating the absolute value of a sample as a maximum of the absolute value of the real component and the absolute value of the imaginary component plus one-half of a minimum of the absolute value of the real component and the absolute value of the imaginary component; combining the absolute values of the first group of samples and the second group of samples to generate a plurality of signal strength values; and generating an index value associated with the primary synchronization code within the communication signal based, at least in part, on a highest signal strength value of the plurality of signal strength values.