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A dual-mode transmission system which utilizes the differential and common modes has been proposed. To improve the channel capacity, a simple diversity, which selected the better transmission mode at a client PC side, was examined at laboratory rooms in a building. It was found that the amount of throughput improvement was 45% compared with the conventional single mode transmission of differential-mode. To overcome the unintentional radiation problem caused by the common-mode transmission, an EMC considered algorithm referred to as a power control algorithm which was adaptive to the electromagnetic environment (AEE) was applied to the proposed system. It has been concluded that relatively small areas such as in a house, an office floor in a building and so on, would be the suitable place of the proposed system.