Design of novel Sigma Shifted Matrix code family with adaptive transmitter-receiver architecture in OCDMA

Abstract

Multiple Access Techniques are unavoidable part in a communication system.Among that optical code division multiple access (OCDMA) technique’s support for asyn chronous communication with comparatively high secrecy and Quality of service has made it an attractive technology for multiple-access optical networks. In OCDMA,the coding scheme that acts as the foundation for the system’s operation is the main ap proach to satisfy user expectations. Each code in the OCDMA system is specifically created to prevent interference from multiple access. Sigma Shifted Matrix code is a novel spectral amplitude coding (SAC) technique that is developed.For the SSM coding scheme design, two methods are suggested. The identity and upper shift ma trices are combined in the first method to create the SSM1 coding matrix. The second method implements the composition of an additional SSM matrix termed SSMs by assembling a single entry, lower, and upper shift matrix. To further improve the per formance of the suggested setup, Then we are creating another code sequence which is called Modified Sigma shifted Matrix (MSSM) by bit wise ANDing of SSMI and SSM2. Combining these matrices results in variable SSM code families,which, de pending on the number of users and the code weights chosen,and can offer additional flexibility. A concept for an optical control module(encoder) is described to make the system as adaptable as possible. To switch between SSM families, this control module chooses the desired encoding-decoding method based on the intended application. In comparison to the formerly used SAC-OCDMA codes, simulation findings show that the optical code division multiple access system based on the proposed SSM code fam ily has better transmission rates, lower bit error rates (BER), Good Quality factor and longer travel distances without any signal quality loss