Application of FBMC to DVBT2: a Comparison vs Classical OFDM Transmissions In this paper, filter bank based multicarrierOffset Quadrature Amplitude Modulation (FBMCOQAM) is compared with a Cyclic Prefix based OFDM (CPOFDM). Indeed, due to its high level of compatibility with OFDM systems, FBMC system is proposed as a new technique for European Digital Video BroadcastingTerrestrial Second generation (DVBT2) systems. To meet the performance requirement of the DVBT2, the approach is based on a technique named nearly perfect reconstruction (NPR) filter bank system. The main characteristic of this approach is the use of Frequency Sampling (FS) SubChannel Equalizer, based on Complex Finite Impulse Response (CFIR) filter, to deal with the high frequency selective impairments. Simulation results indicate that, compared to FBMC, CPOFDM requires about 1dB extra Signal to Noise Ratio (SNR) value at a bit error rate of 103 for high order modulation formats and at large number of subcarriers. As FBMC system discards the use of the cyclic prefix, commonly used in OFDM, the data rate can be increased of up to 14.84% or even 25% maintaining the same bandwidth utilization.

Decision Feedback CIR and CFO Estimation Algorithm for FBMCOQAM System FBMCOQAM is regarded as an alternative modulation scheme for OFDM. The classical Channel Impulse Response (CIR) and Carrier Frequency Offset (CFO) estimation methods based on scattered pilots in OFDM system cannot be directly applied to FBMCOQAM system, because of the intrinsic pure imaginary interference. Traditional methods in FBMCOQAM use scattered pilots and auxiliary pilots to estimate CIR and CFO, which increase system overhead and transmitter complexity. In this paper, we present a novel CIR and CFO estimation method with scattered pseudopilots and iterative decision feedback structure. Simulation results show that the proposed method can estimate the CIR and CFO accurately in frequency selective channel and BER performance is better than the estimation method based on auxiliary pilot. Moreover, timefrequency resources that used for pilot in the proposed algorithm is only half of auxiliary pilot based method.