Abstract
In a traditional wireless transmission system, studies about energy efficiency (EE) are usually for a fixed transmission mode. In this paper, we propose an adaptive wireless transmission (AWT) strategy with consideration of circuit power. In this AWT strategy, the transmission mode is switched between the direct transmission (DT) mode and the two-way relay transmission (TWRT) mode. The switch strategy is based on a transmission rate threshold Rth which makes the EEs of the DT mode and the TWRT mode equal. Furthermore, we propose a transmission rate threshold determining (TRTD) algorithm with a bisection method to find the threshold Rth. The simulation results also show that our AWT strategy has the maximum EE at a reasonable range of transmission rate.
Highlights
Energy consumption in wireless transmission system has been continuously increasing to cater for the explosive growth in demand for high-data-rate wireless applications and a wide variety of diverse quality of service (QoS) requirements during the last decade
To improve EE, we propose an adaptive wireless transmission (AWT) strategy in which the transmission mode is switched between the direct transmission (DT) mode and the two-way relay transmission (TWRT) mode
We propose the AWT strategy in which the transmission mode is switched between the DT mode and the TWRT mode based on the threshold Rth
Summary
Energy consumption in wireless transmission system has been continuously increasing to cater for the explosive growth in demand for high-data-rate wireless applications and a wide variety of diverse quality of service (QoS) requirements during the last decade. We first investigate the transmission rates of the DT mode and the TWRT mode when the scenario of two source nodes exchanging signals is considered. Energy consumption ratio (ECR) which is used to evaluate EE of various kinds of transmission modes is introduced with consideration of the circuit power. We propose the AWT strategy in which the transmission mode is switched between the DT mode and the TWRT mode based on the threshold Rth. With this strategy, it can be seen that EE is always the maximum at a range of transmission rate.
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