A fast selective-direction MMSE timing recovery algorithm for spatial-temporal equalization in EDGE

For the EDGE system with multiple antennas, spatial-temporal equalization can reduce the effect of multipath fading, intersymbol interference and cochannel interference, thereby increasing the capacity and range. With time varying delay spread accurate timing recovery is crucial for good equalizer performance especially when the equalizer length is short because of the multiple receivers with a limited number of training symbols. We propose a fast selective-direction minimum mean-square error (MMSE) timing recovery algorithm. The new timing recovery algorithm determines the estimated burst timing and processing direction for the equalizer by computing the MSE for a decision feedback equalizer in both the forward and reverse time directions. Simulation results show that a 2-branch receiver with our techniques requires about 3 dB lower signal-to-interference ratio than a previous approach for 1% raw BER in EDGE