OEWC-Based Orthogonality Tracking on NIDS

Network Intrusion Detection System (NIDS) monitor traffic on a network looking for suspicious activity, which could be an attack or unauthorized activity. By the Orthogonal Expanded Walsh Code (OEWC) spreading and orthogonality, system can detect intrusion correlation on orthogonality tracking. This orthogonal tracking mechanism based on group matching technique is proposed for NIDSs to detect intrusions and attacks on signal processing. This paper adds survey on BPSK and M-ary QAM OEWC, which can properly support anti-MAI (Multiple-Access Interference) capability on DS-CDMA system. Variable-length characteristic of the OEWC family allows arbitrary code chip, hence, chip length can be chosen to suit the number of users for improving system efficiency and utilization. These together with secure, variable-length and manifold-signal abilities may make OEWC of interest to designers of reliable communications.