2‐Dimensional code design for an optical CDMA system with a parallel interference cancellation receiver

Abstract

SUMMARYThe objective of this paper is to design a two-Dimensional Optical Code Division Multiple Access system (2D-OCDMA) for application in access networks, with coding and decoding functions performed by electronic devices. We present a new construction method of Multi-Wavelength Optical Orthogonal Codes (MWOOC), which permits a high flexibility in the code parameters choice. This work evaluates in the noiseless case, the MWOOC potentialities for two receiver structures: a Conventional Correlation Receiver (CCR) and a Parallel Interference Cancellation receiver (PIC). We show that with a PIC receiver, it is possible to design two-Dimensional codes that respect the access specifications.

A Review on Successive Interference Cancellation Scheme Based on Optical CDMA Network

“…In addition, Goursaud et al have analysed PIC scheme with 2-dimensional electric coding. It has been shown that the conventional correlation receiver (CCR) is not suitable for an electric implementation of 2D-OCDMA system, while the use of a PIC receiver leads to workable 2D electric coding solution [9].…”

“…The PIC scheme is also called multistage cancellation [8]. The basic principle of PIC receiver is to detect all nondesired users (N − 1) and spread them by the corresponding code sequence, and then subtracte them from the original received signal to get the desired user data [8][9]. In 2006 Goursaud et al have analysed the theoretical performance of the PIC scheme with hard-limiter and double hard-limiters as function of code parameters using optical orthogonal codes (OOC) codes.…”

“…The performances of the interference cancellations are still considerably better than the conventional detector. The IC scheme can be executed as parallel interference cancellation (PIC) scheme [8][9] and successive interference cancellation (SIC) scheme [10][11][12][13].…”

Performance enhancement of 2‐D optical CDMA systems using MCM signalling and heterodyne detection receiver

“…The recently proposed two‐dimensional (2‐D) OCDMA system, in which signal is encoded using both time and frequency domains, receives more attention thanks to its ability to support a code set with large cardinality. In addition, 2‐D OCDMA systems can achieve better spectral efficiency (SE) than that of the one‐dimensional ones .…”

Modelagem de redes CDMA-PON baseadas em técnicas de cancelamento paralelo e códigos corretores de erros

“…Para a codificação MWOOC, foi demonstrado em [102] Para este cenário é preciso definir o valor da probabilidade de interferência dos (N u -1) usuários interferentes no código do usuário de interesse. Nesse caso, a variável Q int representa a probabilidade de que um bit -0‖ enviado por um usuário não desejado é erroneamente detectado (bloco 2), e, ainda, que apresenta um chip coincidente com alguma posição da seqüência de código do usuário de interesse, e é dada por [102]   (56) onde N u representa a quantidade total de usuários, W representa a ponderação do código,…”