| Currently, the mobile communication industry is developed rapidly. On the one hand, multi-input Multiple-output (MIMO) technology has been attracted more attention. On the other hand, the increased energy consumption and the environmental stress have brought a new concept -"Green Communications". This concept focuses on the research of energy efficiency problems on mobile communication systems. Following issues are discussed:A new model for energy efficiency of MIMO communication systems is proposed. Considering four different communication scenarios, the performance analysis of energy efficiency and spectral efficiency in MIMO communication systems is compared based on optimization modeling and numerical simulations approaches. Moreover, the impacts of some communication parameters (such as transmission power, path gain, etc.) on the energy efficiency of MIMO communication systems are studied and the initial analysis is simulated.Furthermore, based on the network throughput, a new energy efficiency model is proposed. Considering a cooperative MISO communication system with an infinite interferers, the impact of the interfering base stations (BSs) density, collaboration communication and other channels factors on the energy efficiency of MISO communication systems are simulated based on Monte Carlo simulation methods.Based on a single-cell MIMO-OFDM communication system, a new power control algorithm (i.e., Power Control basing on Energy Efficiency algorithm, PCEE) is designed for optimizing energy efficiency. The simulation results show that the energy efficiency of MIMO-OFDM communication system can be improved by interference coordination, collaboration communication and channel multiplexing methods. In addition, compared to the traditional power control algorithm, this new algorithm has a significantly improvement on the energy efficiency and so as on the spectral efficiency of a MIMO-OFDM communication system. |
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