Otimização de subportadoras pilotos em OFDM PONs coerentes de longo alcance

• Autor(a) principal: Ferreira Júnior, Antonio Elcio [UNESP]
• Data de Publicação: 2019
• Tipo de documento: Trabalho de conclusão de curso
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://hdl.handle.net/11449/203145; http://www.athena.biblioteca.unesp.br/exlibris/bd/capelo/2019-03-19/000913054.pdf
• topic: Comunicações oticas; Multiplexação; Telecomunicações; Multiplexing; Optical communications; Telecommunication

In this work, the impact of the number of pilots and their relative amplitude in the performance of long-reach passive optical networks (LR-PON) using of the Orthogonal Frequency Division Multiplexing (OFDM) is analyzed by means of numerical simulati- ons. OFDM is a multi-carrier modulation format that presents high spectral e ciency and capability to overcome for frequency selectivity, making possible to use this technique by several actual telecommunication standards. PON are formed by passive elements in- terconnected on the optical ber, responsible for enabling the ow of information in the network. Among several types of PON networks, LR-PONs are used, due to their low implementation cost and their large coverage area, which can reach up to 100 km. The system phase noise, in combination with non-linear e ects, however, degrades the signal and, consequently, the performance of such networks. As a solution, the use of pilots (un- modulated subcarriers) have been widely adopted to compensate for phase noise in coherent high-range systems. Thus, the e ect of the pilot number and their relative amplitudes in four QPSK modulation scenarios with di erent number of subcarriers is analyzed. The results show that the best OFDM con guration in terms of bit error rate for the 100-km LR-PON network has 32 subcarriers, being 10 of them pilots with a relative amplitude of 1:3. In terms of energy e cienc, however, simulations reveal that 64 subcarriers where 10 of them being pilots, represents the best con guration, since it presents a satisfactory bit error rate with the lowest ratio of the number of pilots to the total number of subcar- riers. All the coding implemented for the realization of the simulations can be seen in the Appendix