This work investigates the possible SINR gain, which can be obtained by using a low complexity pre-detection antenna system on a handheld phone. The antenna system consist of two antenna elements where the phase and amplitude is altered prior toan RF combining. The investigation is performed in an RF bandwidth corresponding to the one used in GSM.Three types of antenna elements has been investigated; 3/8 wavelength whip, a normal mode helical and a directive patch, where the pairs whip-patch and dipole-patch has been used.The evaluation of the antenna system is based on measurements of incoming multipath fields received by a pair of antenna elements, which is mounted on a dummy handset. The measurements were carried out in a typical GSM-1800 urban micro cell environment.By combining the measured signal at each antenna port the SINR gain has been calculated and evaluated for the antenna system.Both free space and in the presence of a user are investigated. The results shows the potential for a significant improvement of the SINR, then used in a interference limited micro cell environment by a slow moving user.
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