How can the challenges presented by the ever-growing number of wireless mobile devices and the demand for increasingly high data be met without increasing energy consumption and emission power? Currently MIMO (multiple-input, multiple outputs) uses several antennas to transmit and receive signals. This technique is progressively being implemented in devices such as wireless modems and is to be used for the next generation of mobile phones. However, it poses problems because it is costly and difficult to integrate into hardware.
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At EPFL, Julien Perruisseau-Carrier’s group has demonstrated that a single antenna can simultaneously transmit two separate signals that have the same throughput as a MIMO solution. The results were published at the beginning of the year, and part of the new findings will be presented by Julien Perruisseau-Carrier, at the IEEE International Symposium on Antennas and Propagation in Chicago, at the beginning of July.
In a MIMO system, antennas generally have to be placed at a certain distance from each other, which makes inserting them into mobile and miniature devices a complicated process. An even greater problem with this technique is that each separate transmitting antenna must have its own encoding and amplifying signal device, which is costly and energy-consuming.
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