Title :
Perfect difference codes for synchronous fiber-optic CDMA communication systems
Author :
Weng, Chi-Shun ; Wu, Jingshown
Author_Institution :
Dept. of Electr. Eng., Nat. Taiwan Univ., Taipei, Taiwan
fDate :
2/1/2001 12:00:00 AM
Abstract :
In this paper, we introduce the perfect difference sets and propose a synchronous fiber-optic code-division multiple-access system (CDMA) using these sets to generate the signature codes. Two interesting properties of these codes are discussed: (1) any two different codes are cyclic-shifted with each other; and (2) the cross correlation between any two different codes is exactly one. Thus, we may treat these codes as quasi-orthogonal codes. Using the first property of these codes, we can simplify design of the transmitter. In the receiver, we can use the second property to effectively eliminate the multiple-user interference (MUI) without reducing the number of usable codes. Based on the proposed transmitter and receiver, the system performance is derived. The numerical examples reveal that the proposed system can provide reliable communication even under heavy load. We believe that the proposed system using perfect difference codes outperforms any other synchronous fiber-optic CDMA systems
Keywords :
code division multiple access; codes; interference (signal); optical fibre communication; optical receivers; optical transmitters; MUI; code-division multiple-access system; multiple-user interference; perfect difference codes; quasi-orthogonal codes; receiver; reliable communication; signature codes generation; synchronous fiber-optic CDMA communication systems; system performance analysis; transmitter; Bandwidth; Interference elimination; Multiaccess communication; Optical fiber communication; Optical pulses; Optical receivers; Optical transmitters; Spread spectrum communication; Synchronous generators; System performance;
Journal_Title :
Lightwave Technology, Journal of
