Inserção de sequenciais pseudoaleatórios no sistema ISBD-TB para identificação de transmissores em redes de frequência única

• Autor(a) principal: Santiago, Natalia Silva
• Data de Publicação: 2020
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Biblioteca Digital de Teses e Dissertações do Mackenzie
• Texto Completo: https://dspace.mackenzie.br/handle/10899/28598
• topic: TxID; SFN; ISDB-TB; TV digital; CNPQ::ENGENHARIAS

The Digital Terrestrial Television Broadcasting (DTTB) Integrated Services Digital Broadcasting Terrestrial version B (ISDB-TB) is based on ISDB-T physical layer and uses the Orthogonal Frequency Division Multiplexing (OFDM) transmission technique. The ISDB-TB system was not designed to distinguish transmitters in the Radio Frequency (RF) signal. Therefore, this work purposes the insertion of a transmitter identification (TxID). The TxID is a watermarking technique that attaches a Pseudo-Random Noise (PN) sequence with excellent correlation properties to a Digital TV (DTV) signal before transmission. It is a helpful tool for solving issues related to a specific transmitter operating in a Multiple Frequency Network (MFN) or Single Frequency Network (SFN). It is mainly used in SFN for configuration time and power synchronization assistance, avoiding unwanted interference. For this purpose, Gold Sequences (GS) are used as TxID. The TxID is periodically inserted in the first Orthogonal Frequency Division Multiplexing (OFDM) payload symbol, and it is detected by the correlation between the received signal and the transmitted TxID. The performance detection of the TxID was proper even in an environment with a negative Signal to Noise Ratio (SNR). The proposed methodology was implemented in software using GNU Radio Companion (GRC) and Matlab.