tailieunhanh - Báo cáo hóa học: " Research Article Optimal Design of Uniform Rectangular Antenna Arrays for Strong Line-of-Sight MIMO Channels"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article Optimal Design of Uniform Rectangular Antenna Arrays for Strong Line-of-Sight MIMO Channels | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2007 Article ID 45084 10 pages doi 2007 45084 Research Article Optimal Design of Uniform Rectangular Antenna Arrays for Strong Line-of-Sight MIMO Channels Frode Bohagen 1 Pal Orten 2 and Geir 0ien3 1 Telenor Research and Innovation Snanyveien 30 1331 Fornebu Norway 2 Department of Informatics UniK University of Oslo UiO and Thrane Thrane 0316 Oslo Norway 3 Department of Electronics and Telecommunications Norwegian University of Science and Technology NTNU 7491 Trandheim Norway Received 26 October 2006 Accepted 1 August 2007 Recommended by Robert W. Heath We investigate the optimal design of uniform rectangular arrays URAs employed in multiple-input multiple-output communications where a strong line-of-sight LOS component is present. A general geometrical model is introduced to model the LOS component which allows for any orientation of the transmit and receive arrays and incorporates the uniform linear array as a special case of the URA. A spherical wave propagation model is used. Based on this model we derive the optimal array design equations with respect to mutual information resulting in orthogonal LOS subchannels. The equations reveal that it is the distance between the antennas projected onto the plane perpendicular to the transmission direction that is of importance with respect to design. Further we investigate the influence of nonoptimal design and derive analytical expressions for the singular values of the LOS matrix as a function of the quality of the array design. To evaluate a more realistic channel the LOS channel matrix is employed in a Ricean channel model. Performance results show that even with some deviation from the optimal design we get better performance than in the case of uncorrelated Rayleigh subchannels. Copyright 2007 Frode Bohagen et al. This is an open access article distributed under the Creative Commons Attribution License which .