Performance analysis of optical code division multiple access networks for multimedia applications using multilength weighted modified prime codes

Performance analysis of OCDMA wireless communication system based on double length modified prime code for security improvement

“…Throughout the analysis, it has been assumed that N is the maximum number of active users out of available number of sequences, where the remaining number of users is inactive. Furthermore, is given as a random variable that is defined as [13, 15] Thus, Additionally, in the first group the number of active users can be represented by a random variable U , and u is the realisation variable of U . If user #2 is recommended, then hence, the probability distribution can be expressed as where …”

“…In [13–15], many comparisons were held between the codes are illustrated in Table 2, such comparisons included the other important code used in OCDMA systems such as the optical orthogonal code (OOC). These comparisons indicated that the MPC outperforms the OOC.…”

“…The least complex way to increase the code weight is achieved when the code length has been increased, which improves the system security as well. Finally, for the same code weight, the BER performance remains constant, but the computational time is affected by the code length. According to the DLMPC characteristics, this code can be utilised in multimedia applications through OCDMA systems, analogously to WMPC in [14, 15].…”

“…Further, the cross‐correlation level between the used code sequences is the main factor in the calculation of multiple users interference (MUI) level that also affects the SNR. The main target of this research is to design a new code sequence family that satisfies the following advantages: Excellent security level, Good correlation properties, Larger system capacity, Minimum MUI level, Optimal BER performance compared with other existing codes that are utilised in the OWC systems. The proposed double length modified prime code (DLMPC) family belonging to the modified prime codes (MPCs) is discussed in [13–15]. The construction of these prime code (PC) families and the DLMPC was based on the use of different orthogonal code words whose number equals one of the prime numbers .…”

BER performance of OCDMA system based on optimised 2D PhC passive encoder

“…thermal noise, shot noise, and multiple access interference). The probability of l interfering PPM chips overlaps with the desired chip for the case of an ideal chip-synchronous OCDMA network when employing optical orthogonal codes, which is given by [26,27]…”