Optical CDMA using 2-D codes: the optimal single-user detector

• Published in: IEEE communications letters Vol. 5; no. 4; pp. 169 - 171
• Main Authors: Chang, T.-W.F., Sargent, E.H.
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.04.2001; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Applied sciences; Bit error rate; Channel capacity; Detection, estimation, filtering, equalization, prediction; Detectors; Errors; Exact sciences and technology; Information, signal and communications theory; Maximum likelihood detection; Multiaccess communication; Multiple access; Multiple access interference; Networks; Optical fiber networks; Optical receivers; Optical transmitters; Optimization; Signal and communications theory; Signal, noise; Telecommunications and information theory; Two dimensional; Upper bound; Upper bounds; Wavelengths; Performance evaluation; Bit error rate; Optical telecommunication; Code division multiple access; Optimal detection; Signal detection; Maximum likelihood decoding
• ISSN: 1089-7798; 1558-2558
• DOI: 10.1109/4234.917103

We consider the error performance of an optical code-division multiple access network in which two-dimensional codes are generated in time and wavelength. We show from first principles that the optimum single-user detection scheme which yields is the AND detector. By replacing the widely considered SUM detector with the AND detector, the channel capacity can be at least doubled for a given data rate, number of active users, and bit error rate. We have also shown that the error performance of a random code gives a tight upper bound on the performance of deterministic code with the same weight and dimension.