Abstract:

This work study the correlation effect on a new Algebraic Carrier Frequency Offset (CFO) estimation technique for multi-input multi-output (MIMO) orthogonal frequency division multiplexing (OFDM) systems employing Algebraic Space Time Coding (ASTC), in quasi-static correlated Rayleigh frequency-selective fading channels. The technique uses a preamble and is thus especially suitable for burst mode communication. The preamble consists of orthogonal training sequences simultaneously transmitted from the various transmit antennas.

Abstract:

Synchronization issues in wireless sensors networks have emerged as an interesting and important research area in the last few years. However its importance is shown in the way to better organizing the sensors into the network, to communicate with each other via radio links for sharing and Treatment of reliable information. The key point of consideration in this paper, we propose an improvement over Timing-Sync for sensor Networks (TPSN) to synchronize nodes in a wireless sensors network more effectively, with a good precision and lower missed messages. The simulation result using ns-2.34 shows that this protocol has better synchronization accuracy and low missed messages as compare to TPSN

Abstract:

Time synchronization becomes in recent years as a part and parcel for any distributed system such as sensors networks. Many applications of sensors networks need local clocks of sensors nodes to be synchronized and keep synchronization between sensors, to communicate with each other via radio links for sharing and treatment of reliable information. The key point of consideration in this article is to examine and evaluate the most important synchronization algorithms based on a set of factors like energy efficiency, mobility and complexity.