Open AccessTime reversal time‐domain synchronisation orthogonal frequency division multiplexing over multipath fading channels with significant tap delays
Author(s) -
Esmaiel Hamada,
Jiang Danchi
Publication year - 2014
Publication title -
the journal of engineering
Language(s) - English
Resource type - Journals
ISSN - 2051-3305
DOI - 10.1049/joe.2014.0064
Subject(s) - orthogonal frequency division multiplexing , cyclic prefix , delay spread , fading , multipath propagation , time domain , algorithm , computer science , multipath interference , electronic engineering , channel (broadcasting) , spectral efficiency , frequency domain , interference (communication) , autocorrelation , transmission (telecommunications) , multiplexing , telecommunications , mathematics , engineering , statistics , computer vision
Time‐reversed orthogonal frequency division multiplexing (TR‐OFDM) has recently received attention as a promising spectral efficient scheme for single‐input multiple‐output communications over time‐dispersive fading channels. For TR‐OFDM, passive time reversal processing is used as a simple means for channel time dispersion reduction. In particular, pseudorandom noise (PN)‐sequence padding time‐domain synchronisation OFDM (TDS‐OFDM) transmission scheme has been reported as an appealing alternative to the traditional cyclic prefix (CP) OFDM technology as it can provide significant improvement in the spectrum efficiency. In this study, a new correlation based coder for inter‐block and inter‐symbol interference removing in time‐reversed TDS‐OFDM, which is denoted TR‐TDS‐OFDM briefly is proposed. Such a coder is, then, tested for multipath channels with significant tap delays. A Zadoff–Chu sequence with perfect autocorrelation property is adopted as a training sequence (TS) for a TDS‐OFDM system. Simulation results show that, by using TR‐TDS‐OFDM with correlation‐based coder, a TS with length shorter than channel order can be used without introducing notable inter‐block interference. The other merits of the proposed design are also supported by both theoretical analysis and numerical simulations.