@article {11_TAP_PontesCorcoles_ModalNetworkMIMO, title = {Modal Network Model for MIMO Antenna in-System Optimization}, journal = {IEEE Transactions on Antennas and Propagation}, volume = {59}, number = {2}, year = {2011}, month = {Feb}, pages = {643-653}, abstract = {The analysis of MIMO systems is described with the aid of a novel modal network model. For this purpose the capacity performance of typical base station and mobile station antennas in a simulated macro-cellular scenario with varying antenna inter element spacings and antenna rotation will be studied. The model is based on the modal description of typical receiving and transmitting antennas. In this manner a significant simulation time reduction is achieved which allows for faster analysis and optimization. To prove this the effects of both the mobile and base station antennas are investigated. Moreover, for the more restrictive case of base station antennas, a fully modal descriptive model is proven to yield very similar results as those from measured commercial antennas. It is found that the modal approach improves simulation speed without loss of accuracy or generality. Simulations are done for the city of Karlsruhe with a three-dimensional Ray-tracing tool.}, keywords = {3D Ray-tracing tool, Antenna arrays, antenna inter element spacing, antenna optimization, antenna rotation, base station antenna, capacity performance, cellular radio, macro-cellular scenario, MIMO antenna, MIMO communication, MIMO network model, MIMO system, mobile antennas, mobile station antenna, modal network model, multiple-input multiple-output (MIMO), network theory, path-based channel models, receiving antenna, receiving antennas, spherical mode expansion, system optimization, transmitting antenna, transmitting antennas}, issn = {0018-926X}, doi = {10.1109/TAP.2010.2096179}, url = {http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=\&arnumber=5654566}, author = {Pontes, J and J C{\'o}rcoles and Gonz{\'a}lez, M A and Zwick, T} } @article {09_ELL_Corcoles_ModellingLOScoupledMIMO, title = {Modelling line-of-sight coupled MIMO systems with generalised scattering matrices and spherical wave translations}, journal = {Electronics Letters}, volume = {45}, number = {12}, year = {2009}, month = {June}, pages = {598-599}, abstract = {A model to rigorously characterise line-of-sight MIMO systems is introduced. It is based on the generalised scattering matrix of each antenna, considered as isolated, and the rotation and translation coefficients of spherical modes. The resulting channel matrix rigorously includes the exact spherical vector nature of electromagnetic propagation (which may exert a significant influence over short-range links), mutual coupling effects and real antenna reflection, transmission, reception and scattering features. Numerical results are presented for MIMO systems made up of ideal dipoles.}, keywords = {antenna reflection, channel matrix, electromagnetic coupling, electromagnetic propagation, electromagnetic wave propagation, generalised scattering matrix, line-of-sight coupled MIMO system, MIMO communication, multiple-input multiple-output system, mutual coupling effect, S-matrix theory, spherical wave translation scheme}, issn = {0013-5194}, doi = {10.1049/el.2009.0545}, url = {http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=\&arnumber=5069759}, author = {J C{\'o}rcoles and Pontes, J and Gonz{\'a}lez, M A and Zwick, T} }