Abstract
In this paper, we investigate the energy-efficiency for amplify-and-forward relay networks in the presence of channel estimation errors. Two kinds of transmission strategies, i.e., direct transmission (DT) and relay transmission (RT), are dealt with for the energy-efficient communication system design. The energy cost function in DT or RT is defined as the total energy consumption for transmitting one bit data successfully, in which the channel estimation error, the channel estimation cost (i.e., energy consumed for pilot transmission) and the outage probability are included. As the power allocation plays a crucial role in implementing relay networks in an energy-efficient manner, we propose a theoretical framework for energy-efficient power allocation in DT and RT strategies to minimize the energy cost. By simulation, we compare the two transmission strategies according to the energy cost under various network scenarios. Our results provide several insights into the choice between DT and RT strategies if some transmission parameters are known.
Highlights
The promise of high energy utilization in various wireless communication systems has led to persistent attention to energy analysis and optimization, as reported in [1]–[4]
We investigate the energy-efficiency for amplify-and-forward relay networks in the presence of channel estimation errors, in which two kinds of transmission strategies, i.e., direct transmission (DT) and relay transmission (RT), are dealt with
Imperfect channel state information (CSI) was considered in this research, that is, the CSI should be estimated by the network nodes before the packet transmission
Summary
The promise of high energy utilization in various wireless communication systems has led to persistent attention to energy analysis and optimization, as reported in [1]–[4]. In decode-and-forward relay communication systems, the optimal transmit power and number of hops were calculated in [8] to achieve the energy-efficiency; the authors in [13] developed an energy-efficient multilevel heterogeneous routing protocol to improve the network lifetime. For a relay system with amplify-and-forward protocol, a joint optimization of transmit power and relay location is investigated in [14]; the authors in [15] provided a framework of energy analysis and a joint optimization of transmission energy and packet length. We investigate the energy-efficiency for amplify-and-forward relay networks in the presence of channel estimation errors, in which two kinds of transmission strategies, i.e., direct transmission (DT) and relay transmission (RT), are dealt with. As the analytical processes of the energy optimization with DCE and CCE strategies are similar, we study the communication system with DCE strategy in the following of this paper
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