Modified TFRI Channel Estimation Scheme in OFDM-IM for 802.11p

EasyChair Preprint no. 10822

Abstract

IEEE 802.11p is developed to support cooperative intelligent transport systems. In such systems, channel estimation is a challenging problem due to the channel’s double dispersive nature. This paper proposes a modified time domain reliable test frequency domain interpolation (M-TFRI) scheme for 802.11p orthogonal frequency division multiplexing with index modulation (OFDM-IM) systems is proposed. Unlike OFDM, OFDMIM can achieve better performance in vehicular communication environments. However, due to the in-active subcarriers, channel estimation for OFDM-IM is more difficult than OFDM. Inspired by the OFDM TFRI and the structure of OFDM-IM, the proposed M-TFRI utilizes preambles and least square (LS) methods to fill in the missing channel information on in-active subcarriers, reducing the serious performance degradation caused by the conventional TFRI used in OFDM-IM. Simulation results show that the proposed M-TFRI achieves a similar estimation performance as that of the OFDM TFRI. Moreover, the proposed M-TFRI significantly outperforms the existing channel estimation performance designed for OFDM-IM systems.

Keyphrases: IEEE 802.11p, Index Modulation (IM), Least Square (LS), Orthogonal Frequency Division Multiplexing(OFDM), test frequency domain interpolation (TFRI), vehicular channels

@Booklet{EasyChair:10822,
  author = {Si-Yu Zhang and Qing-Shang Dong and Behnam Shahrrava and Yue-Xia Zhang},
  title = {Modified TFRI Channel Estimation Scheme in OFDM-IM for 802.11p},
  howpublished = {EasyChair Preprint no. 10822},

  year = {EasyChair, 2023}}