Browsing Engineering and Informatics by Author "Samarah, Khalid G."
A printed wideband MIMO antenna for mobile and portable communication devicesSee, Chan H.; Elkhazmi, Elmahdi A.; Samarah, Khalid G.; Al Khambashi, Majid S.; Abd-Alhameed, Raed A.; McEwan, Neil J.; Excell, Peter S. (2015)A printed crescent-shaped monopole MIMO antenna is presented for handheld wireless communication devices. The mutual coupling between the two antenna elements can be minimised by implementing a I-shaped common radiator. Both the simulated and measured results agree that the antenna covers the operating frequency band from 1.6 to 2.8 GHz with the return loss and isolation better than 10 dB and 14 dB respectively. To further verifying the MIMO characteristic including far-field, gain, radiation efficiency, channel capacity loss and envelope correlation, the results confirm that the antenna can operate effectively in a rich multipath environment.
Assessing variability in the wideband mobile radio channel.Jones, Steven M.R.; Samarah, Khalid G.; Dama, Yousef A.S.; Abd-Alhameed, Raed A.; Rasheed, W.; Elkhazmi, Elmahdi A. (06/09/2010)An assessment of the performance of OFDM transmissions over the wideband mobile radio channel is reported. The simulation in MATLAB /Simulink is based on the CODIT channel model. The results show that BER deteriorates significantly as the mobile velocities increase from 0 to 30 m/s. Significant variability in the BER for a given channel type is quantified. For a given instance of the channel the standard deviation of the estimated BER is 20%, but when averaged over many separate instances of the same channel type, a standard deviation of 47% is found.