High order non-uniform constellations for broadcasting UHDTV
Authors:
- 1 April 2014
- conference paper
- Published by Institute of Electrical and Electronics Engineers (IEEE)
- No. 15253511,p. 600-605
Abstract
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 significant gains for NUC over uniform constellations, above 1 dB for orders higher than 256-QAM, and up to 2 dB with 4K-QAM. This gain in dB converts into a relative throughput gain of nearly 10% compared to DVB-T2 using 32k FFT size with LDPC code rate 1/2.Keywords
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