On Limits of Wireless Communications in a Fading Environment when UsingMultiple Antennas
Wireless Personal Communications: An International Journal
Design of Optimal High-Rank Line-of-Sight MIMO Channels
IEEE Transactions on Wireless Communications
Cooperative diversity in wireless networks: Efficient protocols and outage behavior
IEEE Transactions on Information Theory
Multiple repeater placement for assisting long-range LOS MIMO links
GLOBECOM'09 Proceedings of the 28th IEEE conference on Global telecommunications
Repeater-assisted capacity enhancement (RACE) for LOS MIMO point-to-multipoint links
MILCOM'09 Proceedings of the 28th IEEE conference on Military communications
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A single on-frequency, full duplex wireless repeater is considered for enhancing the capacity of a long-distance 2×2 multiple-input multiple-output (MIMO) wireless link with a dominant line-of-sight (LOS) component. Such links might be used for high-speed communication between buildings or towers. For practical reasons, the aperture sizes of the transmit (TX) and receive (RX) arrays may be limited, which tends to make the rank of the long-distance MIMO channel matrix close to unity. The paper shows that the addition of just one repeater can bring the channel to full rank, approximately doubling the capacity of the link. Typical values of repeater isolation are assumed. For small TX and RX array element spacings, there is considerable robustness in optimal repeater location. Even with some multipath, most of the capacity improvement is retained.