Title :
Spectral efficiency comparison of two multirate O-CDMA schemes
Author :
Chen, Hung Wei ; Yang, Guu Chang ; Chang, Cheng Yuan ; Kwong, Wing C.
Author_Institution :
Dept. of Electr. Eng., Nat. Chung-Hsing Univ., Taichung
Abstract :
Various multirate transmission techniques, such as the multiple-code (MC) and multicode-keying (MK) schemes, have been proposed for optical code division multiple access (O-CDMA) systems with multimedia services. In this paper, a metric of comparison, so-called the normalized spectral efficiency (NSE), is derived to compare, as a whole, the performance and system efficiency of these two schemes. The NSE of the conventional single-rate on-off-keying (OOK) O-CDMA scheme is also derived for a baseline comparison. Our numerical results show that the MC scheme always has larger NSE than the single-rate OOK scheme, while the MK scheme has the largest NSE under certain conditions.
Keywords :
amplitude shift keying; code division multiple access; multimedia communication; optical modulation; spectral analysis; multicode keying scheme; multimedia services; multirate O-CDMA scheme; normalized spectral efficiency; optical code division multiple access; single-rate on-off-keying O-CDMA scheme; Bit rate; Downlink; Filtering theory; Multiaccess communication; Multimedia systems; Neutron spin echo; Quality of service;
Conference_Titel :
Wireless and Optical Communications Networks, 2008. WOCN '08. 5th IFIP International Conference on
Conference_Location :
Surabaya
Print_ISBN :
978-1-4244-1979-1
Electronic_ISBN :
978-1-4244-1980-7
DOI :
10.1109/WOCN.2008.4542480
