Efficient Energy Allocation Method for Symmetrical Relay Communication in Cooperative Mode

Abstract: Most of the wireless devices (i.e. mobile handsets, laptops, tablets etc.) are designed with only one antenna, especially due to hardware limitations, size and cost factors; cooperative communication can be used to generate transmit diversity [1]. This enables single antenna wireless devices to share their resources during communication in such a manner that creates a Virtual MIMO (Multiple-Input and Multiple-Output) system [2-3]. Major challenges are Resource sharing, Communication Strategies, Energy Efficiency, Range and Security [4-5]. This paper considers the problem of how efficiently to allocate transmission energy in a wireless communication system with two delay- constrained cooperating sources and one destination. The sources in the system are assumed to cooperate via the Orthogonal Amplify-and-Forward (OAF) protocol. The channels are assumed to be flat fading and the sources are each required to satisfy an outage probability constraint. The analysis focuses on optimum energy allocation and energy efficiency for different channel state information under different set of assumptions.

Keywords: Co-operative Communication, Amplify and Forward Relaying technique, Multiple Input Multiple Output Systems, Transmit Diversity, Adhoc Networks, Orthogonal AF Relaying, Channel State Information (CSI) etc