Title :
Cochannel interference reduction in optical PPM-CDMA systems
Author :
Shalaby, Hossam M H
Author_Institution :
Dept. of Electr. & Comput. Eng., Int. Islamic Univ. Malaysia, Kuala Lumpur, Malaysia
fDate :
6/1/1998 12:00:00 AM
Abstract :
A multiple-user interference reduction technique is proposed for optical code-division multiple-access (CDMA) systems. Data symbols from each user are encoded using a pulse-position modulation (PPM) scheme before multiplexing. Modified prime sequences are adopted as the signature codes in the multiplexing process. An interesting property of this code is the uniformity of the cross correlation among its sequences. This property is the main key in constructing the multiple-access interference canceler. In addition to its simplicity, this canceler offers a great improvement in the error probability as compared to the system without cancellation. A simple modification to this canceler that enhances its performance is proposed as well
Keywords :
cochannel interference; code division multiple access; error statistics; interference suppression; modulation coding; multiplexing; optical correlation; optical fibre networks; optical modulation; pulse position modulation; sequences; cochannel interference reduction; cross correlation; data symbol; error probability; modified prime sequences; multiple-access interference canceler; multiple-user interference reduction technique; multiplexing process; optical PPM-CDMA systems; optical code-division multiple-access systems; performance; pulse-position modulation; signature codes; Interchannel interference; Interference cancellation; Multiaccess communication; Multiple access interference; Optical fiber LAN; Optical modulation; Optical pulses; Optical receivers; Pulse modulation; Spread spectrum communication;
Journal_Title :
Communications, IEEE Transactions on
