Low Density Parity Check codes presents itself as the dominant FEC code in terms of
performance, having the nearest performance to the Shannon limit and proving its
usefulness in the increasing range of applications and standards that already used it. Low
power devices are not except of this rapid development, where it emerges the necessity
of decoders of low power without totally sacrificing performance or resource usage.
The present work details research for a LDPC decoder compliant with the DVB-S2
standard for digital television, motivated for its already established use in uplink and
downlink satellite applications and its great performance at large code lengths.
Specifically, this research presents the study of the min-sum algorithm and the elements
that conform the core decoder, including both functional units (variable and check
nodes), memory blocks and routing network. In the context of DVB-S2, it is focused in
the inner LDPC decoder and targets FPGA as platform .
Furthermore, a variety of design strategies are considered as part of the scope of this
work, including the optimal selection of the architecture and the schedule policy, the basis
of the design characteristics of the control unit as a Algorithmic State Machine and the
introduction of specialized modules to reduce the number of clock cycles per decoding
process, such as early stopping.
Under these constrains, it has been selected a set of features for a core design derived
from work, such as code length of 64800 bits and code rate equal to 1/2. The proposed
architecture is partially parallel with flooding schedule and operation over binary
symbols (Galois field GF(2)). It takes the assumption of a channel with AWGN and
BPSK modulation, so the demodulator feeds soft decision information of each symbol
based on both assumptions. / Trabajo de investigación
| Identifer | oai:union.ndltd.org:PUCP/oai:tesis.pucp.edu.pe:20.500.12404/19708 |
| Date | 15 July 2021 |
| Creators | Montaño Gamarra, Guillermo Daniel |
| Contributors | Raffo Jara, Mario Andrés |
| Publisher | Pontificia Universidad Católica del Perú, PE |
| Source Sets | Pontificia Universidad Católica del Perú |
| Language | English |
| Detected Language | English |
| Type | info:eu-repo/semantics/bachelorThesis |
| Format | application/pdf |
| Source | Repositorio de Tesis - PUCP, Pontificia Universidad Católica del Perú |
| Rights | info:eu-repo/semantics/openAccess, Atribución-NoComercial 2.5 Perú, http://creativecommons.org/licenses/by-nc/2.5/pe/ |
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