A transmission/equalisation procedure for mobile digital radio links using interpolated channel estimates

A transmission/equalisation strategy is proposed for frequency-selective, fast time-varying noisy digital channels. Each information data sequence is surrounded by a pair of training sequences of known symbols; these are employed by the receiver to estimate the channel impulse response (CIR) at the beginning and at the end of the timeslot, via a suitable Kalman-like filter with fast convergence properties. The CIR behavior along the data sequence is then linearly interpolated and exploited step-by-step by a maximum likelihood sequence equaliser (MLSE). A simple transmitter/receiver structure is then obtained and its performance analysed via computer simulations.