Extended Reed-Solomon Codes for Optical CDMA Systems

• Main Authors: Yen-Feng Li, 李彥鋒
• Other Authors: 楊谷章
• Format: Others
• Language: en_US
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/16727882175063483781

碩士 === 國立中興大學 === 通訊工程研究所 === 100 === In this thesis, the extended Reed-Solomon codes are modified to construct a new family of 2-D optical codes for asynchronous optical code-division multiple access (O-CDMA). Besides having expanded and asymptotically optimal cardinality, these asynchronous codes can be partitioned into multiple tree structures of code subsets, in which cardinality is a function of the cross-correlation value assigned to the subset. The hard-limiting performance of these 2-D optical codes is analyzed and compared with the multilevel prime codes under the same code parameters. Our results show that the unique partition property of these codes supports a trade-off between code cardinality and performance for meeting different system requirements, such as user capacity and throughput. In addition, the multiple-tree structure of the new codes potentially supports applications that requires rapid switching of many optical codes, such as in O-CDMA-network gateway or in environments where code obscurity is essential.