Re-configurable semi-blind cancellation of asynchronous interference with an antenna array

Abstract

The antenna array asynchronous interference cancellation problem is addressed by means of semi-blind algorithms with projections to the finite alphabet. It has been observed that the conventional least squares (LS) solution estimated over the training interval may not be suitable for initialization of iterative semi-blind schemes in the case of asynchronous interference. Unlike the synchronous case, a modified LS initialization based on the autocorrelation matrix estimated over the whole burst of data outperforms the conventional LS initialization for the high interference level. We propose a re-configurable receiver which exploits on-line selection of the initialization. Its efficiency is demonstrated in TDMA and OFDM environments.