Iterative receiver for millimeter-wave OFDM systems: Evaluation of high Doppler shift by dynamic channel model

An iterative receiver, proposed in our previous works, employs decision directed phase noise compensation (DD-PNC) and decision directed channel estimation (DDCE), and thus can effectively reduce the effects of phase noise on millimeter-wave (mm-wave) orthogonal frequency division multiplexing (OFDM) systems. When the iterative receiver is applied to mm-wave communications between fixed points and high speed trains (HSTs), not only phase noise but also Doppler shift should be considered. In this paper, we evaluate the iterative DD-PNC and DDCE scheme in the HST environment by using a dynamic multipath channel model. Computer simulations show that the proposed scheme can reduce not only the effects of phase noise but also that of Doppler shift, when angle spread (AS) is small. However, when AS becomes larger, it is demonstrated that the performance of the proposed scheme degrades. For alleviating the degradation, we modify DDCE into a symbol by symbol manner, symbol-DDCE (SDDCE) that improves the performance remarkably.