Improved synchronization, channel estimation, and simplified LDPC decoding for the physical layer of the DVB-T2 receiver

Abstract

The newly developed 2nd generation standard for digital video broadcasting (DVB-T2) emerges as a significant upgrade over its first generation predecessor DVB-T. The DVB-T2 standard targets an increased system throughput by at least 30% over the DVB-T. This article introduces algorithms in the signal processing chain to improve the mobile operation for DVB-T2. The proposed modified synchronization blocks, along with the improved channel estimation, show significant improvement compared to the results reported in the DVB-T2 implementation guide. In addition, state-of-the-art low-complexity algorithms in the bit processing chain, particularly in the LDPC decoder, are used to provide robustness and support throughput increase, while reducing the implementation complexity. The integrated system is simulated including implementation effects. The simulation results confirm the enhanced performance of the developed integrated model and provide better results compared to those reported in literature.

Energy‐efficient orthogonal frequency division multiplexing scheme based on time–frequency joint channel estimation

“…For the conventional TDS-OFDM scheme, the iterative interference cancellation with the number of maximum iterations equal to three is carried out to perform channel estimation [12], while the second received PN sequence is directly used for channel estimation in the DPN-OFDM scheme [16]. For the CP-OFDM scheme as specified by DVB-T2 [3], the pilots are used to acquire the channel frequency response (CFR) at the corresponding subcarriers, and then the robust Wiener filtering [27] with low complexity but satisfying performance is used to obtain the CFR over the whole signal bandwidth. It is clear that the MSE performance of the proposed scheme enjoys a significant SNR gain of about 7 dB compared to those of CP-OFDM and DPN-OFDM, when the channel length is close to the GI length.…”