Excess Cyclic Prefix Window Optimization for High Doppler MIMO OFDM Capacity

Kalyana Gopala; Dirk T. M. Slock

ICASSP 2019accepted0 citations

Excess Cyclic Prefix Window Optimization for High Doppler MIMO OFDM Capacity

Abstract

In this work, the authors extend their previous work [1] 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.

BibTeX

@inproceedings{icassp2019_excesscyclicpref,
  title = {Excess Cyclic Prefix Window Optimization for High Doppler MIMO OFDM Capacity},
  author = {Kalyana Gopala and Dirk T. M. Slock},
  booktitle = {ICASSP 2019},
  year = {2019}
}