Low Complex standard Antenna Diversity Technique for DVB-T2 system

The performance of standard Alamouti space frequency block code (SFBC) degrades in highly frequency-selective channels since quasi static fading is required for adjacent subcarriers. An enhanced Alamouti decoder allows a high reliability and capacity enhancement. In this paper, we propose an enhanced Alamouti space frequency block decoding scheme for multiple-input multiple-output (MIMO) and orthogonal frequency division multiplexing (OFDM) systems using cyclic delay diversity (CDD) techniques over highly frequency selective channels. We exemplarity implement this scheme for the second generation terrestrial video broadcasting (DVB-T2) system. Simulation results show that the proposed scheme has lower bit error rate (BER), especially for high SNRs, with respect to the over highly frequency-selective channels such as single frequency networks (SFN). The new scheme allows a high reliability and tolerability. The other advantages of the proposed method are its simplicity, flexibility and standard compatibility with respect to the standard Alamouti decoder.-

Keywords:

Alamouti , CDD , DVB-T2 , MIMO , OFDM