Method and system for iterative multiple frequency hypothesis testing with Cell-ID detection in an E-UTRA/LTE UE receiver

摘要

A mobile device receives a signal comprising a PSS and a SSS. The mobile device performs iterative MFHT utilizing a reduced number of MFH branches. At each iteration, frequency offset estimation and Cell-ID detection are concurrently performed. An iteration starts with selecting initial frequency offsets spanning a frequency offset estimation range. The selected initial frequency offsets are placed in the MFH branches. A particular MFH branch with a maximum PSS correlation peak magnitude is selected at the iteration. A frequency offset estimate in the selected MFH branch is utilized for frequency control. The frequency offset estimation range utilized for the current iteration is reduced for the next iteration. A Cell-ID is declared if the Cell-ID is consistently detected not only within a particular iteration on the basis of having detected consistent cell ID information for the first and second halves of a radio frame, but also from iteration to iteration.

主权项

1. A baseband processor for processing communication signals in a wireless communication device, comprising:
a mixing frequency generator configured to select a plurality of frequency offsets for an iteration of multiple frequency hypothesis (MFH) testing; a plurality of MFH branches, coupled to the mixing frequency generator, configured to receive respective frequency offsets in the plurality of frequency offsets; and an MFH branch selector, coupled to the plurality of MFH branches, wherein, for each iteration of the MFH testing, the MFH branch selector is configured to:
determine, based on respective primary synchronization sequence (PSS) correlation peak magnitudes of the plurality of MFH branches, a selected MFH branch in the plurality of MFH branches, andcheck a consistency of cell identification (ID) information between a first portion of a radio frame for the selected MFH branch and a second portion of the radio frame for the selected MFH branch.