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Recent studies have shown the potential performance gain of Non Uniform Constellations (NUC) compared to the conventional uniform constellations. NUC can be a promising candidate in 5G systems to increase the data throughput. In the literature, NUC is designed for a specific SNR value and propagation channel. However, in broadcast/multicast services, the received signal by different users will see...
This paper introduces the concept of a non-uniform constellation (NUC) in contrast to conventional uniform quadrature-amplitude modulation (QAM) constellations. Such constellations provide additional shaping gain, which allows reception at lower signal-to-noise ratios. ATSC3.0 will be the first major broadcasting standard, which completely uses NUCs due to their outstanding properties. We will consider...
In this paper, we focus on the potential enhancements of the DVB-T2 signaling (L1Post) by the use of newly designed Two-Dimensional Non-Uniform Constellations (2D-NUC). We Base our design on the optimization of the Bit-interleaved Coded Modulation (BICM) capacity, the designed constellations provide a potential performance improvement of 0.55 dB for the overall DVB-T2 signaling performance in high...
In this paper we propose a hybrid Zadoff-Chu (ZC) based pilot sequence suitable for OFDM broadcast systems. While maintaining the same scattered pilot structure and the same power level as in DVB-T2, we replace the phase values by a ZC combined sequence. This combined sequence can either carry information bits through a repetition of small ZC patterns, or serve just as a very robust fine time domain...
This paper focuses on the potential enhancements of the DVB-T2 standard by the use of newly designed Two-Dimensional Non-Uniform Constellations (2D-NUQAM). In this work, a complete analysis of the DVB-T2 system performance when using the proposed 2D-NUQAM constellations against regular uniform (M-QAM) is presented. Based on the optimization of the Bit-interleaved Coded Modulation (BICM) capacity,...
This paper investigates high order NonUniform Constellations (NUC) with constellation sizes of up to 4K-QAM for broadcasting over-the-air very high data rate services such as Ultra-High Definition TV (UHDTV). An iterative algorithm is proposed for fast convergence towards the optimal NUC at each Signal-to-Noise Ratio (SNR) operating point. Performance evaluation assuming DVB-T2 as a reference shows...
This paper investigates the throughput optimization of precoded Orthogonal Frequency Division Multiplexing (OFDM) with hierarchical modulation. Using the asymptotic analysis approach we derive the limit bit error rate (BER) of the high priority and the low priority streams. We then use the effective Signal to Interference plus Noise Ratio (SINR) corresponding to each stream to calculate the aggregate...
This paper investigates the bit error rate (BER) performance of hierarchically modulated precoded Orthogonal Frequency Division Multiplexing (OFDM). We consider a low priority stream modulated on top of a high priority stream with a constellation ratio a and analyze the resulting BER performance. Since the BER depends in a complex way on the particular precoding matrix used, it is difficult for one...
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