A (SEMI)-blind equalization technique for wireless burst transmission systems

In this paper a new indirect channel equalization technique, suitable for wireless burst transmission systems, is proposed. The technique consists of two distinct parts. The first part comprises a parametric method for estimating the unknown channel impulse response (CIR) in a blind or semi-blind manner. The main trait of this method is that instead of seeking the whole CIR sequence only the unknown time delays and attenuation factors of the physical channel multipath components are estimated. The involved CIR estimation method, for the same degree of estimation accuracy, is much simpler as compared to the existing methods. In the second part, a fixed DFE is applied on the current burst yielding the unknown transmitted symbols. The DFE filters are computed in terms of the estimated CIR values via a recently proposed efficient scheme. It should be noted that, since no training or a small number of training symbols are used, the whole technique offers significant bandwidth savings at a reasonable computational cost.