Computationally-Efficient, Low-Order Filtering Technique for TETRA Release 2 Synchronization

The new TETRA Release 2 standard aims to increase the data throughput of the current TETRA 1 standard by a factor of 10. However there are serious issues with the cross-correlation based timing recovery, as specified in the standard. In this paper, we highlight the TETRA release 2 timing recovery issues in narrow-band mode as well as the adjacent channel interference (ACI). A computationally efficient method, based on low-order filtering of the adjacent channel with low peak rejection has been proposed in this paper, which not only completely removes the adjacent channel impact, but substantially reduces the dependence of timing extraction on signal to noise ratio (SNR) level in the region of interest.