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—This paper investigates the benefit of mutual coupling compensation via a method of moments (MoM) approach in a uniform circular antenna array operating at 1.8 GHz. This mutual coupling compensation technique is applied to a direction of arrival (DOA) study of up to two cochannel mobile users. Field measurements and computer simulations are examined to(More)
  • Hao, Melba M Ling, Crawford, D Mercea, Driga, John A Pearce +6 others
  • 2002
To my wife Ning and daughter Cara v Acknowledgements First, I would like to thank my thesis advisor, Professor Hao Ling for his guidance and mentorship, both academically and personally. Without the numerous interesting and enlightening discussions with him, this work would be impossible. His continued support will be remembered for the many years to come.(More)
— The fast fading mobile radio channels place fundamental limitations on the performance of wireless communication systems, such that the prediction of the changing channel behaviors is of interest. For the frequency-selective fading channels in wideband systems, the knowledge of the channel transfer function over the entire frequency band is required. In(More)
  • Kapil R Dandekar, Hao Ling, Guanghan Xu
  • 2000
This paper presents a procedure used to calibrate a smart antenna array to compensate for channel amplitude and phase mismatch as well as mutual coupling effects between antenna array elements. A theoretical basis for this calibration procedure in terms of the smart antenna mathematical model is given. Direction of Arrival (DOA) analysis of data collected(More)
  • Liang Dong, Hosung Choo, Robert W Heath, Hao Ling
  • 2004
— A simulation study of the channel capacity of a MIMO antenna system exploiting multiple polarizations is carried out. We focus on a simple yet realistic tri-monopole antenna structure, taking into account of all the mutual coupling and casing effects using the computational electromagnetics solver NEC. Simulation results show that, with a special transmit(More)
—A new approach to adaptive downlink beamforming to combat fast Rayleigh fading is presented. In this approach, the antennas at the base transceiver station form transmit beam patterns according to the prediction of downlink channels. The channel prediction is a linear prediction based on the autoregres-sive model, which is downsampled to extend the memory(More)
— Multiple-input multiple-output (MIMO) wireless communication systems employ multiple transmit and multiple receive antennas to obtain significant improvement in channel capacity. However, the capacity is limited by the correlation of sub-channels in non-ideal scattering environments. In this paper, we investigate MIMO systems that use antennas with(More)