Bit-Interleaved Coded Modulation (BICM) for ATSC 3.0

PROJECT TITLE :

Bit-Interleaved Coded Modulation (BICM) for ATSC 3.0

ABSTRACT:

During this paper, we have a tendency to summarize and expound upon the choices made for the bit-interleaved coded modulation (BICM) half of the next-generation terrestrial broadcast commonplace known as ATSC three.zero. The structure of the ATSC three.zero BICM consists of a forward error correcting code, bit interleaver, and constellation mapper. So as to achieve high potency over a big selection of reception conditions and carrier-to-noise (C/N) ratio values, several notable new components have been standardized. 1st, twenty four original low-density parity check (LDPC) codes are designed, with coding rates from a pair of/fifteen (zero.thirteen) up to 13/fifteen (zero.87) for two code sizes: sixteen two hundred bits and sixty four 800 bits. 2 totally different LDPC structures are adopted; one structure additional suited to medium and high coding rates and another structure suited to terribly low coding rates. Second, additionally to quaternary part shift keying, non-uniform constellations (NUCs) have been chosen for constellation sizes from 16QAM to 4096QAM to bridge the gap to the Shannon theoretical limit. Two completely different varieties of NUCs have been proposed: one-D NUCs for 1024- and 4096-point constellations, and 2-D-NUCs for sixteen-, 64-, and 256-purpose constellations. 2-D-NUCs achieve a higher performance than one-D-NUCs however with a better complexity since they can't be separated into two independent I/Q parts. NUCs have been optimized for each coding rate for the 64 800 bits LPDCs. The identical constellations are used for sixteen 200 bits LDPCs, though they need been limited up to 256QAM. Finally, a small amount interleaver, optimized for each NUC/coding rate combination, has been designed to maximize the performance. The result's a BICM that provides the biggest operating vary (a lot of than thirty dB, with the foremost robust mode operating below -five dB C/N) and the best spectral potency compared to any digital terrestrial broadcast system nowadays, outperforming the current state-of-the-art DVB-T2 commonplace BICM by as abundant as one dB in some cases. ATSC 3.zero will additionally offer a substantial- increase in the maximum transmission capacity when using the high-order NUCs like 1024QAM and 4096QAM, that will represent a significant milestone for terrestrial broadcasting since the highest order constellation currently accessible is uniform 256QAM. This paper describes the coding, modulation, and bit interleaving modules of the BICM block of ATSC three.0 and compares its performance with alternative DTT standards such as ATSC A/53 and DVB-T2.

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