FIR transceiver design for broadband MIMO multicast system

For broadband wireless systems, the channel between the transmitter and the receiver exhibits frequency selectivity in nature. In this paper, an Finite impulse response (FIR) precoder which supports multiple streams at the transmitter and an FIR minimum mean-squared-error decision feedback equalizer (MMSE-DFE) at the receiver are jointly designed for broadband multi-input multi-output (MIMO) multicast systems. At the base station (transmitter), the FIR precoder design is combined by an FIR matrix multiplied by a unitary one, where the first one is optimized to maximize the system throughput, and the second one is aiming for the signal-to-noise ratio (SNR) fairness among different data streams. Moreover, a Givens-based algorithm is employed to construct the unitary matrix in the multicast system. For each user (receiver), the corresponding FIR MMSE-DFE is derived to eliminate inter-symbol interference (ISI) introduced by both the multicast channel and the FIR filter used at the transmitter. The numerical simulations indicate that the proposed transceiver design with FIR structure has considerable improvement over the existing schemes in terms of BER performance.