Time Reversal in a MISO OFDM system: Guard Interval design, dimensioning and synchronisation aspects
Résumé
This article presents the way to combine TR and OFDM, either in the time domain or in the frequency domain by adding a filter at the transmitter side. The equivalent channel being the autocorrelation of the impulse response of the channel, the channel coefficient affecting each subcarrier is thus purely real, allowing a simple receiver as well as a simple transmitter. Moreover, the shape of the channel and its double length must be taken into account when designing the guard interval, in order to keep the circularity of the channel matrix at the receiver side. Finally, some simulation results show that the guard interval may not be twice as long as the initial channel, allowing to take advantage from all the benefits of time reversal while keeping the same spectral efficiency as a classical OFDM system.
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