Title :
Comparison of unipolar codes for DS-OCDMA system
Author :
Farhat, Amel ; Menif, Mourad ; Lepers, Catherine ; Rezig, Houria ; Gallion, Philippe
Author_Institution :
Lab. SYSCOM, Ecole Nat. d´´Ing. de Tunis, Le Belvedere
Abstract :
In this work, we describe a Direct Sequence Optical Codes Division Multiple Access (DS-OCDMA) system using unipolar codes which are the Prime Sequence (PS), the Quadratic Codes (QC) and the Extended Quadratic Codes (EQC). The performances comparison of the three family codes, for coherent and incoherent source, shows that the EQC codes offer better results on term of Bit Error Rate (BER) than the two others family codes. In fact this family codes presents the better correlation properties. Moreover, we demonstrate that by controlling the optical bandwidth of the encoders/decoders, we can improve system performances in the case of incoherent source.
Keywords :
code division multiple access; codes; error statistics; DS-OCDMA system; bit error rate; direct sequence optical codes division multiple access system; extended quadratic codes; prime sequence; unipolar codes; Bandwidth; Bit error rate; Encoding; Multiaccess communication; Optical filters; Optical transmitters; Passive optical networks; Phase detection; Telecommunications; Time division multiple access; BER; DS-OCDMA; coherent/incoherent source; optical bandwidth; unipolar codes;
Conference_Titel :
Mediterranean Winter, 2008. ICTON-MW 2008. 2nd ICTON
Conference_Location :
Marrakech
Print_ISBN :
978-1-4244-3484-8
Electronic_ISBN :
978-1-4244-3485-5
DOI :
10.1109/ICTONMW.2008.4773064
