Equalizer's Use Limitation for Complexity Reduction in a Green Radio Receiver

This work is about reducing energy consumption in the receiver chain by limiting the use of the equalizer. It is to make the radio receiver aware of its environment and able to take decision to turn on or off the equalizer according to its necessity or not. When the equalizer is off, the computational complexity is reduced and the rate of reduction depends on the percentage of time during which this component is disabled. In order to achieve this scenario of adapting the use of the equalizer, we need to develop a decision-making technique that provides the receiver with the capacities of awareness and adaptability to the state of its environment. For this, we improve a technique based on a statistical modeling of the environment by defining two metrics as channel quality indicators to evaluate the effect of the intersymbol interferences and the channel fading. The statistical modeling technique allows to take into account the impact of the uncertainties of the estimated metrics on the decision making. 1. Introduction The requirements in wireless communications are increasingly growing in terms of services and transmission’s quality. Technological advances in this sense, either in the nodes or in the base stations, have improved the quality of service offered to the users of the wireless communication networks. However, these advances are not without side effects; with this development and with the growing number of mobile phones, the wireless communications consume more and more energy causing so an increase in emissions. In front of this phenomenon, the solutions that make communications less consuming in terms of energy are needed for the preservation of the environment. With this aim, the concept of green communications, or green radio, allows to develop a radio equipment that consumes less energy. One of the solutions to obtain a green radio is to make it able to adapt dynamically to the environment and to use this adaptability in order to reduce energy consumption [1]. In fact, according to the state of its environment, the radio receiver with cognitive capacities can take some decisions of reconfigurations, and so it can select the reconfigurations that need less amount of energy than others. Within this context, we focus in this paper on reducing energy consumption in the radio receiver through its adaptation to its environment. In particular, we are looking at the equalizer component and we seek to limit its use in order to reduce energy consumption. The idea is to make the radio receiver capable of being aware of its environment and deciding to