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In the digital video broadcasting-second generation terrestrial standard, the constellation rotation and cyclic Q-delay techniques have been adopted to improve the bit error rate performance in fading channels. However, they would lead to a substantially increased demapping complexity at the receiver. In order to reduce the demapping complexity, we propose a switched soft demapper, where different...
In this paper, we propose a pilot aided carrier frequency offset (CFO) estimation schemes for the Faster-than Nyquist (FTN) transmission system. The FTN transmission would increase the data rate by overlapping the pulse closer than the Nyquist rate. For this reason, there have been some efforts to apply FTN theory to second generation of digital video broadcasting satellite (DVB-S2) standard. However,...
In this paper, we design an improved transmission parameter signaling scheme that provides a higher quality of reception compared to the conventional P1 preamble of DVB-T2 systems. Specifically, we utilize the cross-correlation properties of the discrete Fourier transform (DFT)-spread Chu sequences. Simulation results show that the proposed signaling scheme has better signaling error rate (SER) performance...
In this paper, we propose a low-complexity switched soft demapper for rotated non-uniform constellation (e.g., nonuniform QAM, non-uniform APSK) DVB-NGH systems. The constellation would be twisted seriously through an I/Q independent fading channel. The requirement for two-dimensional (2D) soft demapping leads to the exponentially increased complexity. The proposed demapper classifies the received...
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