Title :
Novel multi-code pulse position modulation for performance improvement of 2-D OCDMA systems
Author :
Dang, Ngoc T. ; Pham, Hien T T ; Pham, Anh T.
Author_Institution :
Fac. of Telecommun., Posts & Telecommun., Inst. of Technol., Hanoi, Vietnam
Abstract :
In OCDMA systems, pulse position modulation (PPM) and multi-code modulation (MCM) have been proven as efficient methods for respectively mitigating multiple access interference (MAI) and dispersion. In this paper, we propose to combine PPM and MCM to create a novel modulation scheme, multi-code pulse position modulation (MCPPM). We then theoretically analyze the performance of the 2-D OCDMA system using MCPPM over a linear dispersive channel, while taking into account the negative impact of MAI, optical-beating interference (OBI), and receiver noise. It is seen that the use of MCPPM can simultaneously relax the effects of MAI, OBI, and dispersion. As a result, in comparison to the conventional systems using PPM and MCM, the one using MCPPM can support a higher user bit rate and a larger number of users. Also, a lower transmitted power can be achieved.
Keywords :
code division multiple access; dispersive channels; interference (signal); optical communication; pulse position modulation; 2D OCDMA systems; linear dispersive channel; multicode modulation; multicode pulse position modulation; multiple access interference; optical-beating interference; receiver noise; Bit error rate; Fiber gratings; Modulation; Optical pulses; Optical receivers;
Conference_Titel :
Communications (APCC), 2011 17th Asia-Pacific Conference on
Conference_Location :
Sabah
Print_ISBN :
978-1-4577-0389-8
DOI :
10.1109/APCC.2011.6152767