Characterization of MIMO channel capacity in urban microcellular environment
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Doctoral thesis (article-based)
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Technical report / Helsinki University of Technology, Communications Laboratory. T, 55
AbstractThe research work in this thesis consists of several investigations of multiple-input multiple-output (MIMO) wireless channel capacity in urban microcellular environment. The investigations can be categorized into three groups, 1)- model-based investigations, 2)- measurement-based investigations, and 3)- theoretical investigations. Utilizing three dimensional (3D) channel models the influence of environment physical parameters and antenna array configuration on MIMO channel capacity are investigated. In terms of environment influence, parameters such as street width, wall relative permittivity and multipath richness are considered. In terms of antenna array configuration, the effect of array geometry and uniform linear array (ULA) azimuthal orientation are considered. It is shown that the effect of these parameters on MIMO channel capacity is significant. Based on field measurements, the effect of spatial smoothing on the accuracy of a widely used stochastic narrowband MIMO radio channel model, namely, the Kronecker model, and the impact of temporal signal to noise ratio (SNR) variations on MIMO channel capacity are investigated. Results from non-line of sight (NLOS) and line of sight (LOS) propagation scenarios are analyzed. While under NLOS conditions spatial smoothing significantly enhances the applicability of the Kronecker structure, under LOS conditions spatial smoothing does not help to improve the accuracy of the Kronecker model. It is also noticed that while the temporal SNR variation has significant impact on the capacity of MIMO wireless channel in a NLOS propagation scenario, the influence is smaller under LOS conditions. Theoretical investigation of antenna mutual coupling (MC) on the capacity of MIMO wireless channels is presented with particular emphasis on the case of high SNR scenario. It is shown that the effect of MC on MIMO channel capacity can be positive or negative depending on the spatial correlation properties of the propagation environment and the characteristics of the two ends MC matrices. The impact of phase noise (PN) on the accuracy of measured MIMO channel capacity is studied by considering its effect on both the spatial multiplexing gain and the power gain. It is shown that in the case of a low rank physical channel matrix the PN impact is more pronounced on the spatial multiplexing gain than on the power gain. Based on that an eigenvalue filtering (EVF) technique is proposed to improve the accuracy of the measured MIMO channel capacity.
MIMO systems, channel capacity, mutual coupling, phase noise, array geometry, Kronecker model
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- Abdulla A. Abouda, H.M. El-Sallabi and S.G. Häggman, Reducing Impact of Phase Noise on Accuracy of Measured MIMO Channel Capacity, IEEE Antennas and Wireless Propagation Letters, to appear. [article2.pdf] © 2007 IEEE. By permission.
- Abdulla A. Abouda, H.M. El-Sallabi, Lasse Vuokko and S.G. Häggman, Spatial Smoothing Effect on Kronecker MIMO Channel Model in Urban Microcells, Journal of Electromagnetic Waves and Applications, vol. 21, no. 5, pp. 681-696, 2007. [article3.pdf] © 2007 Brill Academic Publishers. By permission.
- Abdulla A. Abouda, N.G. Tarhuni and H.M. El-Sallabi, Model-Based Investigation on MIMO Channel Capacity in Main Street of Urban Microcells, in Proceedings of the 2005 IEEE International Symposium on Antennas and Propagation, AP-S 2005, vol. 2A, pp. 313-316, Jul. 2005, Washington, DC, USA. [article4.pdf] © 2005 IEEE. By permission.
- Abdulla A. Abouda, H.M. El-Sallabi and S.G. Häggman, Effect of Antenna Array Geometry and ULA Azimuthal Orientation on MIMO Channel Properties in Urban City Street Grid, Progress In Electromagnetics Research, PIER 64, pp. 257-278, 2006. [article5.pdf] © 2006 EMW Publishing. By permission.
- Abdulla A. Abouda and S.G. Häggman, Effect of Mutual Coupling on Capacity of MIMO Wireless Channels in High SNR Scenario, Progress In Electromagnetics Research, PIER 65, pp. 27-40, 2006. [article6.pdf] © 2006 EMW Publishing. By permission.
- Abdulla A. Abouda, H.M. El-Sallabi and S.G. Häggman, Effect of Mutual Coupling on BER Performance of Alamouti Scheme, in Proceedings of the 2006 IEEE International Symposium on Antennas and Propagation, AP-S 2006, pp. 4797-4800, Jul. 2006, New Mexico, USA. [article7.pdf] © 2006 IEEE. By permission.