Blind channel shortening in ZP-OFDM systems with controlled TIR quality

We consider a zero padding OFDM system to which we apply channel shortening to cope with channel responses larger than the guard interval (GI) redundancy. In this article, we propose a blind channel shortening algorithm based on the restoration of zero padding (ZP) redundancy. A main contribution consists in the introduction of a new optimization constraint that allows us to control the target impulse response (TIR) quality and to improve significantly the system performance. Finally, we present a performance comparison between this new technique and similar existing techniques from the literature: MERRY and FRODO algorithms.