Recently, major services provided by mobile communications systems are shifting from voice conversations to data communications and there is a great demand to increase the data transmission rate. However, there will be an important problem to overcome; as data transmission rate becomes higher, the peak transmit power becomes larger. To decrease the peak transmit power while increasing the data transmission rate, the cell size should be made significantly small. However, in realizing nano- or even pico-cell network, the use of present cellular concept may not be optimal. In this paper, we propose a virtual cellular concept to realize pico-cell network and evaluate the transmit power and frequency efficiencies of the virtual cellular system, then compare them with that of the conventional cellular system.
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