Orthogonal frequency division multiplexing index modulation (OFDM-IM) has been emerging as a promising solution to increase the reliability at low complexity. However, the transmit diversity of the OFDM-IM schemes has been limited to two, due to unbalanced transmit diversity between index bits and complex data bits. In this work, we propose a new precoded OFDM-IM employing several spread matrices, named as (S-OFDM-IM). This aims to increase the transmit diversity, exploiting not only a subset of active sub-carrier indices, but also spreading the active indices over all the sub-carriers available. In this context, the transmit diversity in the detection of both index bits and data bits will be increased, properly taking into account both the multipath and index diversities. As for low-complexity detection, we propose two linear-complexity detections that exploit the minimum mean square error and the zero-forcing, along with the likelihood ratio. To analyse the performance, the bit error probability is derived and the transmit diversity analysis is provided. Through simulation results, it is clearly presented that the proposed scheme can outperform the benchmarks in terms of the transmit diversity, being higher than two. The enhanced transmit diversity is desired to the low complexity machine type applications with high reliability.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Precoding for Spread OFDM IM


    Contributors:


    Publication date :

    2018-06-01


    Size :

    1765339 byte





    Type of media :

    Conference paper


    Type of material :

    Electronic Resource


    Language :

    English



    Hybrid Spectral Precoding/Windowing for Low-Latency OFDM

    Taheri, Tayebeh / Nilsson, Rickard / van de Beek, Jaap | IEEE | 2017


    A Precoding OFDM MIMO Radar Coexisting With a Communication System

    Bao, Dan / Qin, Guodong / Cai, Jingjing et al. | IEEE | 2019


    Open-Loop Correlation Reduction Precoding in Overloaded MIMO-OFDM Systems

    Matsuoka, Hikari / Doi, Yoshihito / Yabe, Tatsuro et al. | IEEE | 2015


    Dispersion-Tolerant DDO-OFDM System and Simplified Adaptive Modulation Scheme Using CAZAC Precoding

    Feng, Z. / Wu, Q. / Tang, M. et al. | British Library Online Contents | 2016


    Unique Word DFT-Spread-OFDM for Fast Time-Varying Channels

    Berardinelli, Gilberto / Pedersen, Klaus / Frederiksen, Frank et al. | IEEE | 2017