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Multi-Input-Multi-Output (MIMO) is an emerging technology for the 4th-generation mobile communication systems due to the capability of high-speed data transmission. There have been only a few literatures regarding MIMO propagation characteristics under outdoor condition, and most of which have focused only on 2 GHz bands for existing cellular systems. However, since 3.4-3.6 GHz band will be allocated...
A wideband directional measurement campaign was managed inside an arched highway tunnel to analyze the radio propagation channel inside such tunnel for future cellular systems in terms of coverage, delay spread and dominant scatterers. Measurements were performed in 3 rounds with different transmitter positions. Using a wideband channel sounder equipped with a cylindrical dual polarized array at the...
Multi-band antennas covering 5 bands (GSM850, GSN900, GSM1800, GSM1900 and UMTS), whose frequency ranges are specified, are essential components in mobile phone. They can either enhance or degrade the performance. The main problem with multi-band antennas for mobile phones is the interrelationship between size and performance (efficiency, bandwidth). One of these can be improved at expense of the...
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