A new Approach to Blind Channel Identi cation for Mobile Radio Fading Channels

Channels Andreas Schmidbauer, Werner Specht and Rupert Herzog Technical University of Munich, Department of Communications Engineering, Arcisstra e 21, D-80290 Munich Phone: +49-89-289-25008, Fax: +49-89-289-23490, Email: [email protected] Abstract A new algorithm for blind channel identi cation based on the Super-Exponential-Algorithm [4] is introduced. Combining the impulse response of the equalizer with the channel impulse response leads to an iterative algorithm with fast convergence qualities and short block length on the assumption of independent, identically distributed (i.i.d.) data. The algorithm is robust with respect to system over t (supernumerarily assumed channel coe cients converge to zero) and in uence of additive white Gaussian noise even in mixed-phase moving average (MA) channels. Despite of the use of fourth order cumulants the complexity of the algorithm is rather simple compared with alternative blind methodes. The implementation on a signal processor (TMS320C40) performs nearly in realtime under GSM conditions.