The development of digital coherent optical communication technology has boosted the system capacity close to the nonlinear Shannon limit imposed by the combination of additive noise and nonlinear distortion. In this context, spatial division multiplexing (SDM) has emerged as a promising solution to overcome such a capacity limit. SDM systems, however, are affected by the channel-dependent loss as well as by interchannel crosstalk. In this paper, we obtain analytical expressions for the system capacity in presence of both impairments, showing that when multiple-input-and-multiple-output processing is implemented on the receiver side, the crosstalk can be compensated.

Resumo. Visando sistemas de comunicação sem fio de quinta geração (5G), algumas técnicas de codificação de canal se tornaram candidatas para serem utilizadas em suas transmissões. O objetivo deste trabalho, é realizar a comparação de duas destas técnicas, os códigos convolucionais e os códigos polares, visando a aplicação em comunicações ultraconfiáveis para sistemas 5G.

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