Energy allocation for green multiple relay cooperative communication

Abstract

Cooperative communication achieves diversity through spatially separated cooperating nodes, which are battery powered in most applications. Therefore the energy consumption must be minimized without compromising the quality of service. In this context, we present a novel energy allocation scheme for multiple relay nodes that results in efficient cooperative multiple-input multiple-output (MIMO) communication. Considering channel path loss, the total transmission energy is distributed between the source and the relay nodes. The energy distribution ratio between the relay and direct link is optimized such that the quality of received signal is maintained with minimum total transmission energy consumption. We calculate the energy distribution ratio analytically and verified it through computer simulation. With the new energy allocation scheme, the system also obtains an increased channel capacity as compared to the cooperative scheme with conventional equal energy allocation and the non-cooperative scheme. Optimal relay positioning with the proposed energy allocation scheme is also explored to maximize the capacity.

Bit Error Rate Performance Analysis of a Multiple Amplify and Forward Relaying Aided Cooperative MIMO-OFDM System

“…Previously it was demonstrated that in terms of network reliability and transmission energy multiple-relay system can outperform a single relay system without affecting the BER. [13]. A clear study has been demonstrated in [7]- [14], where performance on text message transmission was evaluated based on a single relay cooperative OFDM system under AF and DF.…”

“…Besides, [15] has shown that BER was considerably improved by using multiple relays with low SNR value for audio and text data. Based on current wireless standards, such as IEEE 802.16j, in [8][9][10][11][12][13][14][15][16] an OFDM based multi-hop relaying system has been proposed. The issues with implementation of cellular network based on OFDM-based multi-hop was accounted by Can et al [17].…”

Performance analysis of multiple relay cooperative communication over generalized κ–μ and η–μ fading channels

“…In this paper, we assume the same system model [32][33][34][35] assumptions made in [25] i.e., we consider the source, destination and the relay terminals are equipped with a single antenna and the channels are assumed to be mutually independent. There are two phases of transmission in the cooperative communication system.…”

Cross-layer topology design for network coding based wireless multicasting

“…It is observed that the equal energy allocation for all nodes in the network may not be optimal since the energy allocation at each node depends on many factors, such as the role of node (source and/or relay and/or destination), the location of node, and the connections of a node with the other nodes in the topology [28]. It is assumed that the energy supply of all nodes can be adaptively adjusted in a centralised manner to meet the total energy consumption constraint in the whole network.…”

“…It can be observed from (32) and (33) that, subject to fixed SNR of the wireless link and limited node power, we cannot allocate high data flows for wireless links in the non-NC-based LCRT protocol. However, in the proposed NC-based LCRT protocol, the summation of flows in the wireless link capacity and node energy constraints is replaced by the maximum of flows (see (28) and (30)). This means that, as |S m | is large, much higher data flows can be allocated for wireless links, and thus the system throughput is significantly improved.…”