Study on Highly Reliable Radio Communications Using Transmit Beam-forming with a Virtual Antenna Array

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Future mobile communications need to use a higher frequency band to accommodate a wider frequency bandwidth. In a higher frequency band, the attenuation of electromagnetic waves is severely large. In an uplink channel, we may have difficulties to realize reliable transmission because the transmit power of a user terminal is limited due to battery use. In this study, we have proposed a virtual antenna array in which plural user terminals cooperate with each other and operate as a single terminal. The virtual antenna array forms transmit beams toward a base station. We have proposed several elemental technologies to realize the virtual antenna array. It has been shown that when four user terminals cooperate each other, we can reduce transmit power by about 6dB comparing with a conventional single user terminal case.