Spatial modulation orthogonal frequency division multiplexing with subcarrier index modulation for V2X communications
Spatial modulation orthogonal frequency division multiplexing (SM OFDM) is a novel OFDM technique which conveys additional information by active antenna indices of subcarriers, and thus achieves enhanced data rate and robustness against inter antenna interference within subcarriers. Index modulated OFDM (IM OFDM) applies the concept of index modulation to subcarrier domain and is shown to have reduced inter carrier interference (ICI) In this paper, we propose SM OFDM with subcarrier index modulation (ISM OFDM) for vehicle to vehicle and vehicle to infrastructure (V2X) to mitigate the ICI caused by Doppler effects. The idea is to to embed subcarrier index modulation to SM OFDM and conduct SM at the active subcarriers independently. It is shown via computer simulations that the proposed scheme achieves better bit error rate (BER) performance than classical SM OFDM systems under V2X channel models.
2016 International Conference on Computing, Networking and Communications (ICNC)