2-Dimensional optical CDMA system performance with parallel interference cancellation

2D OCDMA System for Service Differentiation

“…To generate code families with constant length and different weight values, we first construct a single service 2D code family with parameters (L×F, W, 1, 1), named MWOOC [8]. The construction of a MWOOC matrix is based on a 1D code.…”

“…This minimal value is obtained with a MWOOC(12×163,12). One 1D OOC(163,12,1,1) position vector is given by: [1,2,4,8,17,42,68,73,90,110,118,153]. From this vector we construct 2D matrices MWOOC(12×163,12) and investigate the partition we consider to reach the targeted BERs with equations (3) and (5).…”

“…In this paper, we propose a partitioning method applied to 2D codes in order to perform more than two services differentiation. From 2D codes named Multi-Wavelength Optical Orthogonal Codes (MWOOC) [8], which provide a single-service with high QoS, i.e. low BER, we define 2D subcodes with lower weight values for different BER values.…”

Performance of Optical CDMA Systems with Low Density Parity Check Codes

“…a targeted Bit Error Rate (BER)), the spreading code length has to be high, and the available data rate is reduced. Nowadays, the most promising code sequences are 2 Dimensional (2-D) codes constructed both in time and frequency domain [3][4]. Actually, thanks to this additional degree of freedom, the temporal length can be reduced faced to 1-D code length in order to reach the same performance.…”

“…By optimizing the decoding algorithm, we apply the LDPC to an OCDMA transmission using 1-D OOC and 2-D spreading codes named Multi Wavelength Optical Orthogonal Codes (MWOOC) [4]. We show that the BER is significantly improved not only in a noiseless case with only MAI, but also in presence of thermal or Gaussian noise.…”