Performance Analysis of Time-Reversal Based Precoding Schemes in MISO-OFDM Systems
Résumé
Time-Reversal (TR) precoding schemes are regarded as promising candidates for robust and energy-efficient wireless systems. These schemes are characterized by their low computa- tional complexity at the receiver side. In this paper, we present novel analytical expressions of the average bit error rate (BER) of TR technique and the Equal Gain Transmission (EGT) scheme in MISO-OFDM systems. We further provide simple and tight upper bounds on the ergodic capacity of these schemes. Hence, these theoretical analyses might be very useful to avoid lengthy simulations. This paper also provides an interesting conclusion: For large number of transmit antennas, i.e. in Massive MIMO, TR technique outperforms the EGT scheme and its performance approaches that of Maximum Ratio Transmission (MRT) scheme. Hence, it confirms the applicability of TR scheme in the future Massive MIMO systems. Simulation results with LTE-A system parameters are provided in order to corroborate our analysis.