In this work, the authors extend their previous work  on the design of sum rate maximizing beamformers for a MIMO OFDM scenario under high Doppler. We first justify the linear approximation for the channel variation over an orthogonal frequency division multiplexing (OFDM) symbol. Then, a modified power update for the optimized spatio-frequential precoder is presented. Of great interest is the exploitation of the Excess Cyclic Prefix (ExCP) at the receiver through windowing. We prove that the sum rate metric is a convex function of the window parameters and present a novel majorization based algorithm to design an optimal window. The convergence of the iterative approach is proved and the theory is validated via numerical simulations.
Excess cyclic prefix Window optimization for high doppler MIMO OFDM capacity
ICASSP 2019, International Conference on Acoustics, Speech, and Signal Processing, 12-17 May 2019, Brighton, UK
Systèmes de Communication
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