DocumentCode :
2266636
Title :
Mitigation of MAIs by the second encoding scheme in TTFR-based optical CDMA systems
Author :
Miyazawa, Takaya ; Sasase, Iwao
Author_Institution :
Dept. of Inf. & Comput. Sci., Keio Univ., Yokohama
fYear :
2005
fDate :
4-9 Sept. 2005
Firstpage :
392
Lastpage :
396
Abstract :
In optical code division multiple access (CDMA) networks, the system which equips tunable transmitters and fixed receivers (i.e. TTFR) achieves simple configuration and protocols. However, when there are other simultaneous users who transmits pulses with the same code, large amount of multiple access interferences (MAIs) cause serious performance degradation. In this paper, we propose second encoding scheme in which first-encoded optical pulses are further encoded by the second optical orthogonal code (OOC) assigned to the transmitter. The proposed system with second encoding scheme can achieve higher processing gain in the correlator than the conventional system without second encoding scheme because the number of weights increases due to the second encoding. This results in the mitigation of the effect of MAIs. We analyze performance of the proposed system and show that the proposed system with second coding scheme can achieve better bit error probability than the conventional system without second encoding scheme
Keywords :
code division multiple access; encoding; error statistics; interference suppression; optical fibre networks; optical receivers; optical transmitters; MAI mitigation; TTFR-based optical CDMA systems; bit error probability; first-encoded optical pulses; fixed receivers; multiple access interferences; optical code division multiple access networks; performance degradation; protocols; second encoding scheme; second optical orthogonal code; tunable transmitters; Access protocols; Correlators; Degradation; Encoding; Multiaccess communication; Multiple access interference; Optical fiber networks; Optical pulses; Optical receivers; Optical transmitters;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Information Theory, 2005. ISIT 2005. Proceedings. International Symposium on
Conference_Location :
Adelaide, SA
Print_ISBN :
0-7803-9151-9
Type :
conf
DOI :
10.1109/ISIT.2005.1523362
Filename :
1523362
Link To Document :
بازگشت