Low Complexity Duplex Model For Multi-User LTE System In High Speed Train Environment

摘要

This paper presents a low complexity duplex model for multi-user long term evolution (LTE) system well-suited in high speed train (HST) environment. In the fast time-varying channel the time-selective fading is a major concern for block-type estimation process implemented in time-division duplex long term evolution (TDD-LTE) system. In HST environment, the coherence time of the channel is comparable with sub-frame duration; the tracking of time-varying channel coefficients has to be included in the estimation process. The complexities involved in processes of tracking of the time-varying channel coefficients given in the literatures are very high. In the proposed model the time-varying channel state information (CSI) is updated in frequency domain by utilizing the detected information symbols during intermediate uplink blocks and the complexity involved is much lower than that present in literature as it does not require the estimation of Doppler shift or huge memory space.