In this paper, the impact of various diversity
schemes of Alamouti Multiple Input Single Output (MISO) technique applied in Digital Video Broadcasting-Terrestrial second generation (DVB-T2) system has been evaluated. Indeed, DVB-T2 is now mature, and many studies have been done to
improve its performance. MISO is an optional block integrated in this system standard to improve its performance depending on the propagation environment. In particular, Single Frequency Network (SFN) propagation constitutes an environment where the overlapping areas of transmitters suffer from destructive interference. Therefore, the advantage of diversity technique is exploited to improve the signal robustness in these areas.
Co-located and distributed diversity topologies are foreseen to deploy MISO in DVB-T2 system. While the former supposes that transmitters are localized on the same site, the latter implements
transmitters at distributed sites. In this work, the performance highlighted by these topologies is presented in comparison to the performance of Single Input Single Output (SISO) technique.
Moreover, in addition to the Bit Error Rate (BER) classically used to evaluate system performance, the Modulation Error Ratio (MER) is also used. The results have shown that colocated MISO technique outperforms SISO technique by 2:18 dB
while distributed MISO technique outperforms SISO technique by 5:37 dB at a BER of 105 in presence of Rayleigh P1 channel.
In the case of SFN, co-located MISO technique outperforms SISO technique by 2:58 dB while MISO distributed mode outperforms SISO technique by 15:24 dB at a BER of 105. Furthermore, the
MER values confirm the performance improvement of DVB-T2 system when distributed MISO is exploited. Those results are obtained by using CSP-DVB-T2 simulator that was modified in order to evaluate MISO impact in DVB-T2 system.Appui à la mise en place d'un Master professionnalisant en photonique et en radiodiffusion numérique - PHORAN - Fédération Wallonie Bruxelle
