Title	Performance Enhancement through Reduced Complexity Channel Estimation Algorithm for 4G OFDM Systems
Author	C. Padmaja and Dr. B. L. Malleswari
Citation	Vol. 17  No. 4  pp. 140-143
Keywords	OSTBC, Bit error rate, Spectral Efficiency, Moment generating function.

Title	Using Dynamic Moving Average in Real-Time Systems to Minimize Overhead and Response Time for Scheduling Periodic Tasks
Author	Ahmed Alsheikhy
Citation	Vol. 17  No. 4  pp. 133-139
Keywords	Real-time applications, efficient dynamic scheduling algorithm, timing constraints, periodic tasks, probability distribution.

Title	An Efficient Algorithm for K-Rank Queries on Large Uncertain Databases
Author	Abdu Gumaei, Rachid Sammouda, and AbdulMalik S. Al-Salman
Citation	Vol. 17  No. 4  pp. 129-132
Keywords	Large uncertain databases, K-Rank queries, dominating vectors, Tuples, Instances.

Title	A Comparison of VoIP Performance Evaluation on different environments Over VPN Multipoint Network
Author	Adel Alharbi, Ayoub Bahnasse, and Mohamed Talea
Citation	Vol. 17  No. 4  pp. 123-128
Keywords	VPN multipoint, VoIP, Delay, Jitter, Packet loss, MOS, Simulation, Emulation, Security