Title :
On the cutoff rate of a variable-bit-rate (VBR) OFFH-CDMA system
Author :
Inaty, Elie ; Shalaby, Hossam M H ; Fortier, Paul
Author_Institution :
Dept. of Electr. & Comput. Eng., Laval Univ., Que., Canada
Abstract :
A new method is proposed to analyze the cutoff rate of a variable-bit-rate (VBR) optical fast frequency hopping code division multiple access system (OFFH-CDMA) using fiber Bragg gratings and direct detection. This approach exploits the linear structure of passive optical CDMA systems and the nominal time required to accomplish the encoding-decoding operations in such systems. A system model is presented and analyzed based on a newly introduced bit-overlap procedure. An expression for the cutoff rate of a VBR OFFH-CDMA system is derived. It is shown that for a required quality of service (QoS) guarantee, the system´s data rate can be increased beyond the nominal limit imposed by the physical constraint of the encoder-decoder set.
Keywords :
Bragg gratings; code division multiple access; decoding; frequency hop communication; optical fibre networks; quality of service; variable rate codes; FH-CDMA; QoS guarantee; VBR; code division multiple access; cutoff rate; decoding; direct detection; encoding; fiber Bragg gratings; optical fast frequency hopping; quality of service; variable bit rate; Bit rate; Communication networks; Cutoff frequency; Decoding; Delay effects; Gratings; Multiaccess communication; Optical fiber networks; Optical sensors; Power control;
Conference_Titel :
Communications, 2002. ICC 2002. IEEE International Conference on
Print_ISBN :
0-7803-7400-2
DOI :
10.1109/ICC.2002.997376
