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Microwave and Optical Technology Letters

Cochannel interference cancellation via employing a reference correlator for synchronous optical CDMA systems

Maw-Yang Liu, Hen‐Wai Tsao

Published Jun 20, 2000• 39 citations
Publisher

Abstract

Interference cancellation using a reference correlator for synchronous optical CDMA systems is investigated. We employ a padded modified prime sequence to achieve a “unique” cross-correlation value of “1” among all signature sequences. This scheme requires only one reference correlator to effectively suppress the interfering signals. © 2000 John Wiley & Sons, Inc. Microwave Opt Technol Lett 25: 390–392, 2000.

DOI
10.1002/(sici)1098-2760(20000620)25:6<390::aid-mop8>3.0.co;2-3

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Interference cancellation using a reference correlator for synchronous optical CDMA systems is investigated. We employ a padded modified prime sequence to achieve a “unique” cross-correlation value of “1” among all signature sequences. This scheme requires only one reference correlator to effectively suppress the interfering signals. © 2000 John Wiley & Sons, Inc. Microwave Opt Technol Lett 25: 390–392, 2000.
We propose a novel quasi-synchronous coherent time-spreading optical CDMA (TS-OCDMA) system, where the synchronization among users can be controlled within permissible time delay. Relationship between the system performance and code parameters is analyzed. In quasi-synchronous coherent TS-OCDMA system, beat noise (BN) and multiple-access interference (MAI) are depend- ent on the mean intensity of aperiodic cross-correlation within permissible time delay. LA sequence is employed in this network, and code performance is analyzed. Within permissible time delay, the mean intensity of aperiodic cross-correlation equals zero, and hence the BN and MAI can be eliminated in quasi-synchronous coherent TS- OCDMA system. When the time delay is out of zero correlation zone, crosstalk value of LA sequence is less than that of Gold sequence. Therefore, quasi-synchronous coherent TS-OCDMA using LA sequence is beneficial in a low-user-load OCDMA network.