Intercalamento temporal por transformada de Fourier: um novo método robusto para transmissão de sinais de TV Digital. / Fourier transform based time interleaving.

AUTOR(ES)
DATA DE PUBLICAÇÃO

2008

RESUMO

This work introduces a new transform-based time interleaving algorithm: FTI-OFDM (Fourier Transform Interleaved OFDM), in which binary information is spread over several symbols, both in time and frequency domains. This process, designed to be included in digital modulation systems, is computationally efficient when used in conjunction with OFDM modulation. Simulations are used to show its superiority over the usual binary time interleaving used in ordinary OFDM under several impairment scenarios, that include long impulsive noise and deep fading. Also introduced in this work is the additional method of decision error feedback (ERF), that enhances the performance of FTI-OFDM in almost all situations. Furthermore, ERF is deterministic and non-iterative and employs the same computational resources found in OFDM systems. The performance of an FTI-OFDM system, similar to ISDB-T standard, is evaluated under several impairments, such as are found in Digital TV broadcasting environment.

ASSUNTO(S)

televisão digital ofdm modulation telecomunicações digital television transformada de fourier (análise matemática) time interleaving digital communications

ACESSO AO ARTIGO

Documentos Relacionados